A Simple Guide to Headset Technology

by Plantronics.com

As telecommunications technology keeps changing and spawning exciting new product lines in headsets, how do you keep up? Is an over-the-head or earbud design right for you? We have a quick solution. Just take a minute to scan the list of commonly used terms and trademarks below, and we can give you a jumpstart on determining which Plantronics headset solution best suits you!

2.5 mm

2.5 millimeter plugs are standard, round plugs. Many Plantronics mobile headsets come with this size of plug, which should fit standard mobile and cordless phones.

3.5 mm

3.5 milimeter plugs are standard, round plugs often found on stereos and computers. They are larger than the 2.5 mm round plugs found on telephones.

Many Plantronics computer headsets come with two 3.5 mm plugs which connect into your sound card’s microphone input (pink or red) and line output (black, blue, or green).

A2DP (Advanced Audio Distribution Profile)

A2DP is a Bluetooth profile that transmits stereo sounds. Also referred to as the AV profile, it is designed to transfer a stereo audio stream (such as music) from an mp3 player to a headset or car radio. The Plantronics Pulsar headsets support the A2DP profile.

Amplifier

Amplifiers make sound louder. This technology enables headsets to be used with corded phones and phone systems. Plantronics manufactures and markets a wide selection of corded, stand-alone amplifiers, such as the M12 and A20. Amplifiers are also included as part of a headset system, such as the S12 and S20. The CA10 is an amplifier for a cordless headset system.

Analog

Analog refers to a type of sound signal. In regards to Plantronics products, it refers to computer headsets that plug directly into a computer’s sound card with two, round 3.5 mm plugs.

AudioIQ®

AudioIQ makes wireless conversations effortless and pleasant, regardless of the environment. For incoming calls, AudioIQ automatically adapts to background noise levels and intelligently improves the receive quality, clarity and volume level. For outgoing calls, AudioIQ reduces background noise for listeners up to 7-8 decibels, or by approximately 50 percent. It also minimizes interference from artifacts such as speech distortions to maintain exceptionally clear voice intelligibility.

Base

Base refers to your headset’s charging base or amplifier.

Behind-the-head

Plantronics recently introduced the new, behind-the-head neckband accessory that adds a unique wearing style to DuoPro® (H181, H181N) and DuoSet® (H141/H141N) headsets. The neckband offers a fresh alternative for those looking for a contemporary wearing style.

Binaural

Binaural headsets cover both ears, while monaural headsets cover only one.

BT

Abbreviation for Bluetooth.

Bluetooth® Profile

Click Here for more information about Bluetooth profiles.

Bluetooth Technology

Bluetooth™ is an amazing new wireless technology using short-range radio links that promises to eliminate the cables and wires that currently connect most computing and communications devices. At Plantronics, we're using this technology in such products as our new wireless mobile headset, the Discovery™ 655.

Call Clarity™

Proprietary Plantronics technology, Call Clarity is an electronic signal processing and noise reduction system found in our amplifiers that enhances transmit and receive quality.

Cell Phone Plug

See “2.5 mm.”

Clearline

Clearline™ is an audio technology used for superior call clarity, and it is featured in the Plantroincs Vista M22 amplifiers. It is compatible with both traditional phones and headsets as well as wideband VoIP phones and headsets. It provides advanced echo management, delivers consistent and comfortable call volume, reduces background noise, and protects against loud noises.

Computer Plug

See “3.5 mm” and “sound card.”

Control Panel

Control Panel is part of the Windows operating system. Going into the “Sound and Audio Devices” section of the Control Panel allows you to change the settings for your computer’s sound devices. Control Panel’s location varies, but it can often be reached by going to Start>Settings>Control Panel.

Convertible

Convertible headsets offer the choice of two wearing styles, usually over-the-head for stability or over-the-ear for easy on/off convenience. These headsets can easily be "converted" from one style to the other in a few simple steps. Plantronics convertible headsets include the DuoPro® (H171/H171N), the DuoSet® (H141/H141N), and the M170/M175 mobile headsets.

CA (Cordless Amplifier)

CA stands for “cordless amplifier.” These units connect into your phone’s hand receiver port and come with a remote that can be used away from the desk.

CS (Cordless System)

CS stands for “cordless system.” Cordless systems come with both a CA (cordless amplifier) and a headset. See “CA” for more details.

Date Code

The date code of your product designates its date of manufacture, and it can be used to establish your warranty period. The date code is generally listed with your product’s model and part number, although this is not always the case. The date code can be located on the base of the unit, beneath the ear cushion, under the battery, or along the microphone boom. See our Knowledge Base for more details.

DECT

DECT stands for “Digitally Enhanced Cordless Telephony”, which is a type of wireless technology used in certain Plantronics headsets such as the CS50, CS70, CS351, and CS361, among others.

Dongle

Dongle is a term for “adapter.” It generally refers to a Bluetooth adapter that plugs into your computer’s USB port and gives you additional Bluetooth profiles and support. These adapters, such as Plantronics’ BUA-100, are sometimes called “Bluetooth dongles” or “USB dongles.”

Device Manager

Device Manger is a Windows program. One feature of Device Manager is its ability to list the drivers installed on your computer system. You can check there to see if any drivers are missing or incomplete.

DSP (Digital Signal Processing)

In Plantronics products, DSP refers to computer headsets that connect via the USB port rather than the computer’s sound card.

Earbud and In-the-ear style

Earbud style describes a small, discreet headset with a speaker that fits in the ear and the microphone positioned along the cord. The H132N office headset, as well as the MX100 and the M205 mobile headsets are some examples.

Earclip/Earhook

See “Earloop.”

Eartip

A foam or plastic tip that attaches to a headset and fits snugly inside of your ear.

Firefly® On-Line Indicator

Firefly is the unique in-use indicator light that lets others know you are on the phone. No more interruptions! You can find it on the CT12 cordless headset telephone.

Hand Receiver (Port)

The hand receiver is the portion of the telephone that you hold in your hand when talking. It is generally attached to the phone with a curly cord. The hand receiver plugs into the phone’s hand receiver port (usually a square, modular plug).

Headset (Port)

Some, but not all, phones have a headset port. This headset port may be a round, 2.5 mm plug, or a square modular RJ9 plug. However, most Plantronics amplifiers are designed to plug into the telephone’s hand receiver port rather than the headset port.

HFP (Hands Free Profile)

HFP is a more advanced version of the HSP Bluetooth profile. It allows voice dialing activation, redial, call transfer, and call answer/end capabilities.

HSP (Headset Profile)

HSP is a Bluetooth profile used for voice, mono music, and internet chat programs. This is the most commonly used profile, providing support for the popular Bluetooth headsets to be used with mobile phones.

Link Dropping

Link dropping means that the signal between the headset and the telephone periodically disconnects. If you experience link dropping, we recommend that you establish a new signal between the headset and the telephone by repairing or resubscribing your headset.

Modular

Modular means square and generally refers to modular, RJ9 plugs. Most Plantronics amplifiers use modular ports.

Monoaural

Monoaural headsets cover only one ear, whereas binaural headsets cover both.

Multipoint

Multipoint is also known as “multishifting.” Although all of our Bluetooth headsets can pair with up to 4 different devices, multipoint technology allows some Bluetooth headsets to switch active connections between two paired devices. Non-multipoint headsets can be actively connected to only one device at a time. See our Knowledge Base for more information.

Noise-canceling

Noise-canceling refers to a microphone design that greatly reduces the transmission of background noise, enhancing headset sound quality. Noise-canceling headsets are especially effective for offices with employees in close proximity to one another. In mobile applications, noise-canceling microphones reduce background noise in cars, airports or on the street.

N/NC

See “noise-canceling.” Headset model numbers that end with “N” are noise-canceling models.

Over-the-ear

Over-the-ear is used to describe Plantronics headsets that have over-the-ear earloops or other devices to hold headsets in place. TriStar®, Mirage® and the M130 are some examples.

Over-the-head binaural

When it's important to help filter or screen out background sound, you should consider over-the-head binaural headsets, such as the Supra® (H61/H61N) headset and Encore® (H101/H101N) headset. This style provides sound transmission to both ears.

Over-the-head monaural

Plantronics monaural headsets, on the other hand, deliver sound to one ear. Unless it says otherwise, Plantronics headsets are monaural.

Pairing

Pairing refers to establishing a wireless connection between a headset and a phone. It is often used to describe the initial set up between a Bluetooth headset and phone.

Pairing Mode

Pairing mode is required to make the initial connection between a Plantronics Bluetooth headset and a Bluetooth device. When a Plantronics headset is in pairing mode, it will flash either blue/red or green/red for several minutes. During this time, it is possible to pair the headset to a Bluetooth device. See our Knowledge Base for pairing instructions.

Passkey

Passkey refers to a password needed to connect a Plantronics Bluetooth headset to a Bluetooth device. For most Plantronics products, this passkey is 0000.

PIN

See “passkey.”

PerSono Software

Persono software is a free enhancement available for download from the Plantronics website. Several versions are available:

PerSono

• Software enhancement for use with DSP headsets
• Provides tone control of headset audio

 

PerSonoPro

• Software enhancement for use with DA60
• Provides tone control of headset audio
• Gives administrator option to disable headset mute and volume controls

 

PerSonoCall Enterprise Edition

• Software enhancement for use with compatible soft phones
• CS50-USB, 510-USB
• Provides call answer/end control

 

PerSonoCall Consumer Edition

• Software enhancement for use with .Audio 910 & Skype only
• Provides call answer/end control

 

QD

See “Quick Disconnect”.

Quick Disconnect™

On H-Series headsets, the Quick Disconnect™ (QD) Connector is at the end of the headset cable that lets you disconnect your headset from an active call when you need to grab a fax or file, then easily reconnect. With the QD, there's no need to put the call on hold or remove your headset.

Radiolink

An active radiolink means that your headset currently has a live connection with your mobile or VoIP phone. An inactive link means that your headset is not in use.

Receive

Your receive volume refers to the volume of what you hear. Increasing your receive volume will make the caller sound louder for you. It will not affect the way that your voice sounds to the caller.

See “Transmit.”

Remote

Cordless headsets often come with a remote unit. The remote unit is a small, rectangular piece that attaches to the headset. The remote includes a battery and volume controls.

Reset

Resetting your wireless headset can clear static and correct other acoustic issues. See our Knowledge Base to find reset instructions for your headset.

RJ9

RJ9 is a standard, modular plug on most corded telephones. Many Plantronics amplifiers also use this plug size.

Resubscribe

To resubscribe is to reestablish the signal between a wireless headset and its amplifier. If the headset uses Bluetooth technology, this process is called “pairing.”

RX

See “Receive.”

Sound Card

A sound card is a computer component that processes sound and provides ports for audio devices such as microphones, headsets, and speakers.

Sound Recorder

Sound recorder is a program built into the Windows operating system that allows you to make voice recordings. This program can also be used to test your headset. Sound recorder’s location varies depending on your version of Windows, but it can sometimes be found by going to Programs>Accessories>Entertainment>Sound Recorder.

SoundGuard Plus™

An automatic gain control system found in Plantronics amplifiers, SoundGuard Plus provides natural voice tone and removes loud tones, as well as occasional noises and crackles on the line.

Stereo

Stereo sound refers to sound that sends different signals to the left and right sides of the headsets, as opposed to mono sound, which sends just one signal. Stereo headsets are headsets that support stereo sound.

Transmit

Transmit volume refers to the volume of your voice and your headset’s microphone. If you increase your transmit volume, your voice will sound louder to the caller. It will not affect the way that the caller’s voice sounds for you.

See “Receive.”

TX

See “Transmit.”

USB

USB stands for “Universal Serial Bus”, and refers to a common port on computers. Some mobile phones also use USB or “mini-usb” connections to transfer data.

Voice Tube

Also called “attitubes” or “mic sticks,” voice tubes are translucent, plastic tubes which serve as microphones in some Plantronics headsets. Voice tubes are removable and can be replaced.

VoIP

VoIP stands for “Voice-over internet protocol” and refers to sending voice signals and phone calls over the internet.

Windsmart

WindSmart provides wind-noise reduction technology for optimal sound clarity. It’s highly recommended for calls made outside (or in moving vehicles with open windows).

Y-Training Cable

The Y training cable allows you to connect two headsets with QD (Quick Disconnect) connections to one phone. It also includes a mute switch which allows you to mute either headset. This will allow two people to listen to the same call for training purposes. See our Knowledge Base for more information.

Now that you've mastered our basic course in headset technology, why not instantly see how it can make your life easier and more productive, whether it's in the office, at home, or in the car? Click on our product finder and you're sure to discover the perfect Plantronics headset, designed with your needs in mind.

How to Choose a Car Video System

Imagine this: it's summer vacation time. You've got the family packed into the minivan and you've been on the road for hours. It's hot, even with the air conditioning on. But not once have the kids in the back complained, asking if you're there yet. In fact, you've been enjoying the radio, and haven't heard a peep out of them, except maybe the occasional fit of the giggles. How is this possible? You've got the power of mobile video on your side!

Mobile video has really taken off recently as a fun, viable, and even necessary addition to in-car entertainment. Several new SUV and minivan models feature mobile video components as factory options, and a growing number of people have decided to retro-fit their vehicles with video entertainment systems.

Get Everything You Need

Wireless headphones allow backseat passengers to enjoy a movie without disturbing the driver.

RCA composite video cables deliver crystal-clear video transmission — some carry audio signals as well.

Source switchers and video boosters are helpful for video systems with multiple sources and monitors.

Mobile TV antennas for use with specific TV tuner modules, and antennas for satellite TV.

Why mobile video?
There are plenty of reasons for stepping up to mobile video, including:

• Entertainment. There's no denying that every trip, from jaunts to the local supermarket to cross-country vacation hauls, are much easier and more enjoyable when the kids have access to engaging entertainment options. Backseat video systems, for which there are plenty of options we'll explore a little later, allow your kids to watch their favorite movies and cartoons, or, in some cases, even play their video game system. As a bonus to you, most incorporate headphones into the system, so they'll be able to hear the movies privately, while you still enjoy the radio up front.
• Safety. Some video systems give you the option of connecting a navigation system, which provides turn-by-turn visual and voice directions, which help you get where you're going efficiently and accurately. Not having to fiddle with conventional maps is a huge advantage, especially if you're driving through unfamiliar territory for the first time. Some systems also allow you to connect a backup camera, which can be a tremendous safety enhancement to larger vehicles, such as RVs.
• The Wow! Factor. Few mobile electronics components cause the stir that mobile video does. Take in-dash receivers with monitors for example — if you've got one installed in your dash, the first time your passengers see the retractable monitor motoring out of the dash and into position, they won't be able to help oohing and ahhing. Some systems offer touch-screen controls, which never fails to impress. Just the on-screen graphics alone is enough to produce delight in most people.
• The car is a fun environment in which to watch movies. It's great to be able to watch your favorite movies in the backseat when the vehicle's in motion. And it's just as enjoyable to pop a DVD in an in-dash receiver, park the car, and start the show. If you go with a comprehensive setup, you can even get true 5.1 home-theater-style sound, which sounds spectacular in the cozy environment of the car.
• The Wild Cards. Mobile video systems drastically expand the number of entertainment options you can have in your vehicle. Movies, video games, local television, even satellite television (we're not kidding) are all available for use in your car, truck, van, or SUV. And mobile video technology just keeps getting better all the time.

Backseat video systems, like the headrest monitor shown here, can help keep your passengers (especially kids) entertained on trips of any length.

What do I need?
We'll discuss individual mobile video components in the pages that follow. Basically, a mobile video setup requires three things:

• A video monitor for displaying the images
• A media player, such as a DVD player or VCR
• An audio component, such as wireless headphones

Some systems contain all the components you need in one package; others require you to assemble and connect a series of components. Which you need depends largely on where you're installing your system, and what you intend to do with it.

Practically speaking, mobile video can be divided between front-seat and backseat systems (although, there's plenty of crossover applications, as we'll see later).

Most often, front-seat systems consist primarily of in-dash receivers with monitors. These receivers fit in a standard-sized dash opening, and usually have a monitor that's motorized and capable of retracting into the receiver's chassis for storage.

Backseat systems usually involve monitors that can be installed in various locations, such as in the headrests or on the ceiling, separate DVD or videocassette players, and audio components (such as wireless headphones). Complete packages that include everything you need for a basic system are also readily available.

Each type of system has its inherent advantages, as we'll learn in the following pages. Which type is the right one for you depends entirely on what you'd like to get out of your system.

How to Choose a Car Video System

Mobile video, front and center

The easiest way to get a mobile video system that serves the front seats in your vehicle is to install an in-dash receiver with a built-in monitor. These high-powered receivers feature motorized, retractable monitors (usually LCD, and 6-1/2 or 7 inches), which act as TV screens for your videos, system information displays, and sometimes system controllers. These receivers are also typically impressive just from an audio standpoint; they usually feature high-end internal components for great sound reproduction, as well as extensive tone controls.

Mobile video receivers are also generally capable of extensive system expansion; most allow you to connect extra audio or video components, plus useful gear like DVD navigation and backup cameras.

Mobile video receivers, like this model from Clarion, fit in standard dash openings, and feature retractable LCD video monitors.

If you choose to go this route, you'll most likely want a receiver with DVD playback, which basically acts as an all-in-one solution. In order to play a DVD, you'll have to have your vehicle parked and the emergency brake engaged — this is strictly for safety reasons; you certainly don't want to be distracted by the captivating images of your favorite films while cruising the Interstate at 65 m.p.h.! When you're not watching a film, however, the display will act as your system's command central, and, depending on the model, might even offer touch-screen control. Many video receivers also feature cool graphics, such as equalizer displays, that accompany your music.

The receiver installs just like a standard deck does — it just requires a few more connections. Most of these are made at a hideaway box that you can mount just about anywhere that's out of the way, yet accessible; under the passenger seat is the most common spot. The hideaway box features all the inputs and outputs; it's basically the brains of the operation. The receiver deck connects to the box with a single cable. Power and ground connections, however, must be made for both the receiver and the hideaway box.

Warning: removing your seat could deactivate your vehicle's SRS system.

You might also choose a CD receiver with a retractable monitor. It'll give you almost all the features of a DVD receiver, minus DVD playback capability, of course. Connect a video player (DVD or VHS) to the the hideaway box, and you're all set. A receiver like this tends to be more budget-friendly, as it generally costs less than the typical DVD receiver.

Front-seat monitors are essential if you're thinking about installing a GPS navigation system (see our Navigation article in the Learning Center for more detail about how these systems work) for turn-by-turn guidance to just about anywhere in the country. Most mobile video receivers have dedicated navigation inputs for same-brand navigation systems, which makes the connections easier. And unlike watching a movie, you'll be capable of using the navigation system when the vehicle's in motion (it wouldn't be too useful otherwise, right?), since it's providing essential information.

A GPS navigation system can give you detailed visual directions and voice prompts to get you just about anywhere you go accurately and safely.

Backup cameras can come in very handy, too, especially with larger vehicles. The camera, mounted on your rear bumper, gives you a clear view of what's behind you as you back up. Many video receivers have dedicated backup camera inputs. They'll also automatically reverse the image on the screen, so it'll look completely natural to you as you use the screen to navigate backwards.

Possibly the most impressive feature most video receivers have is dual- or multi-zone capability. Receivers with either of these capabilities will have at least one set of audio/video outputs, as well as at least one set of audio/video inputs. Separate monitors and a transmitter for wireless headphones for the back seat can be hooked up to the outputs. Additional sources, such as a video game console, can connect to the A/V inputs. When you engage the dual-zone feature, you can send the signal from one source, like the DVD player or video game console, to the rear monitors and headphone transmitter; the folks in back will be able to enjoy that source. Meanwhile, you can still play the radio, for example, over the car's speakers. The more zones a receiver can control simultaneously, the more diverse your entertainment options get.

How to Choose a Car Video System

 

Backseat Cinema
If you're planning on setting up a mobile video system in the backseat, you've got plenty of options from which to choose.

The most common solution is a combination of a component DVD player (or VCR), a separate monitor, and a sound component — usually wireless headphones. The choices you have range in complexity from simple, all-in-one packages to installation-intensive, multi-component systems.

Headrest monitors
In systems that involve separate components, LCD monitors, which generally range from 5 to 7 inches, are often mounted in the front-seat headrests. Most folks, however, aren't entirely comfortable slicing their headrests open, installing a bracket, and sewing it back together as necessary; this prospect is especially dicey when one considers the chances of making a mistake.

Component monitors like this one from Clarion can be mounted in your headrests with the help of special brackets.

Some manufacturers have solved this dilemma by producing mounting brackets that simply secure to the posts of the front-seat headrests. A monitor mounts on an arm of the bracket, which is usually adjustable.

Monitor mounting brackets (like the one shown here from Farenheit) secure to the posts of a front-seat headrest, make installing a monitor for the back seat much easier.

Other manufacturers have designed factory replacement headrests that have monitors already installed. They look remarkably like the factory originals, even down to the fabric color and texture, and simply take their place in the seat.

Factory-style headrests (like this one from Vizualogic) simply take the place of your vehicle's factory headrest, and feature monitors already installed. The fabric and color of the replacement headrest match your vehicle's interior.

In either case, once you've installed the monitor, you'll have to connect it to a separate player. Component DVD players (or videocassette players) can be mounted in out-of-the-way locations: center consoles are very popular choices; under the seat can make sense, as well. You'll just have to make sure you can access its front panel in order to insert and remove your discs. And don't forget, you can use an in-dash DVD receiver with backseat monitors; the receiver becomes the main media source in this scenario.

The video outputs of your player should be connected to the video inputs of the monitors with video cables specifically designed for mobile applications — they'll be better insulated than cables designed for use in-home, and will generally keep radiated "noise," which is always prevalent in a mobile environment, from sneaking into the system and degrading your video quality. You'll also have to connect the audio outputs of your player to an audio component in order to hear your DVDs; we'll discuss your audio options momentarily.

Overhead monitors
Fold-down overhead monitors are popular, too, especially in SUVs and minivans, where there's plenty of space. Between mounting and wiring them, they demand a fairly significant amount of installation expertise; if you go this route, you might consider letting a professional handle the installation.

Regardless of who installs it, however, there are certainly some inherent advantages to an overhead monitor. Mounting a monitor on the ceiling makes it much easier for all your backseat passengers to see the picture. This type of monitor is also well out of harm's way whenever you're loading or unloading cargo from your vehicle. Some include built-in dome lights, in case you have to mount it over your vehicle's factory dome light. Some are also compatible with housings that have been designed for specific vehicles (that let you retain factory ceiling-mounted controls and displays).

As with a headrest monitor, you'll have to connect an overhead monitor to a separate media player and to an audio component.

Overhead monitors, like this Panasonic model with built-in DVD player, secure to your vehicle's ceiling, and fold up and out of the way when not in use.

There are, however, overhead monitor packages that help make things significantly easier for you. Some feature DVD players built right into the housings, which reduces the number of wiring connections you have to make. Some overhead monitor/player combos even feature built-in wireless FM modulators, which beam the audio signal over an unused FM frequency directly to your factory stereo, as well as infrared transmitters, that send the audio signal wirelessly to a set of compatible headphones. These all-encompassing systems eliminate the need for you to run wiring all through your vehicle; your primary concern will focus solely on installing the monitor and housing on your vehicle's ceiling.

Player/monitor combos
The easiest solution of all in the backseat mobile video arena is a self-contained player/monitor combination. These usually simply strap onto the back of your vehicle's front seats (typically at the headrest) and plug into the cigarette lighter for power. They'll feature some sort of audio output (such as headphone jacks, and/or an RCA composite set of audio/video outputs). They're convenient, easy-to-install, and totally portable. The only drawbacks: their picture quality tends not to be quite as good as systems with separate components, and their sound-delivery options are slightly limited. They also might not install as neatly as or exactly where you'd like them to, which can in turn limit their visibility. But if you're looking for a "quick fix" that requires no installation work, these are certainly viable options.

DVD player/monitor combos, like this one from mPac, strap to the back of a front seat, and plug right into one of your vehicle's power outlets. They give you everything you need for instant, installation-free video entertainment.

Making sure you can hear your system
With any system, you'll have to find a way to hear the sound. A few monitors out there have audio inputs (so they'll receive the audio signal from the player) and jacks for wired headphones; simply plug the headphones in, and you have instant audio. Most likely, you'll want to connect the audio to a transmitter for wireless headphones.

There are two types of wireless headphones and transmitters: RF (radio frequency) and IR (infrared). In both cases, the audio output from your media source connects directly to the transmitter via audio patch cables. RF transmitters "broadcast" the audio signal over a specific radio frequency wavelength to its compatible set (or sets) of headphones. Because they use radio frequencies, the transmitters can be mounted anywhere in the vehicle; the headphones act as "antennas." These work remarkably well; the only potential drawback is that they might be susceptible to slight radio interference (although that's generally unlikely). IR transmitters "beam" the audio signal direcly to a set of compatible headphones. They aren't susceptible to interference like RF transmitters are, but the transmitter itself must be mounted within a direct line of sight of the headphones; obstacles will block the signal from reaching the headphones.

Wireless headphones, like these from Clarion, allow backseat passengers to listen to the video source privately.

You can also use your vehicle's sound system to play your video soundtracks, if you prefer. If your receiver has auxiliary inputs (as some aftermarket receivers do), you can connect the audio from your media source directly to them using audio patch cables. If your receiver doesn't have auxiliary inputs (as is the case with many aftermarket and nearly all factory receivers), you can use an FM modulator. The audio from your source connects directly to the modulator; the modulator then connects to your radio's antenna input (power and ground connections are required, too), and "broadcasts" the sound over an unused FM frequency.

As previously mentioned, you might find a system that uses a wireless FM modulator. It operates on the same principle as wired modulators, except it doesn't require you to make a direct connection to your radio's antenna input, which is remarkably convenient! Like wireless headphones, wireless modulators may fall prey to occasional interference, and the range of frequencies over which they can broadcast can be a bit more limited than those of hard-wired versions. But they can solve some very tricky installation problems, by eliminating the need for you to access the back of your radio

How to Choose a Car Video System

 

This Kenwood KVT-915DVD features built-in surround-sound decoding for true home-theater-style digital sound.

You can make your mobile theater sound like your home theater!
As with your home stereo, it's actually possible to get true 5.1 surround sound in a car! The cozy, enclosed nature of the vehicle makes it easy to hear the distinct channel separation. Your vehicle's front and rear speakers act as the front left and right and surround left and right channels. You'll have to add a center channel speaker (which can present some mounting challenges; consulting a professional is highly recommended, depending on your experience) and an amplified subwoofer to complete the speaker setup.

There are several ways to get surround sound in your car:

• Hook your Dolby Digital® and DTS®-compatible DVD player (or in-dash DVD receiver) up to a separate surround-sound decoder. This is usually done with an optical digital cable, although some brands have proprietary connections that work between their own components. It's very similar to a home setup. The signal from the decoder will then have to go to separate amplifiers. You'll need amplification for your front, rear, and center-channel speakers, as well as for your subwoofer. A four-channel amp will work for the front and rear speakers. You'll then either need separate amps for the center channel and subwoofer, or powered versions of both speakers (both of which are available). A very few in-dash DVD receivers let you loop back the audio signal from the decoder and use their internal amplifiers to power the front and rear speakers (which means you'll still need to amplify the center channel and sub).
• Install an in-dash receiver with built-in surround decoding. These receivers decode the digital surround-sound signal internally, and have all the speaker outputs you need, including center channel. All you have to add in this case is an amplified subwoofer.
• Use a multi-channel theater component amplifier.The mobile video market in 2004 witnessed the debut of five-channel amplifiers that feature built-in digital surround decoding. These offer front and rear speaker outputs, a center channel output, and a preamp output for connecting a separately amplified sub. These make for clean, powerful installations with excellent sound quality.

It's even possible, with the help of a special antenna like this one from KVH, to get satellite TV broadcasts in your vehicle.

High-end accessories
Did you know that it's possible to get satellite television in your vehicle? Well, it is. We're not kidding.

The beauty of a comprehensive mobile video system is the number of entertainment options it affords you. In addition to movies and music, you can add video games, local and satellite television, even your camcorder to the mix. What you can add depends on how many audio/video inputs your system has. Some components (video games, notably) might also require items such as power inverters in order for you to operate them in your vehicle.

Adding multiple components makes multi-zone capable video systems all the more fun. For example, if you have two monitors, a game system, and a satellite radio tuner hooked up to an in-dash receiver with multi-zone capability, you can listen to XM over the car speakers, while one backseat passenger watches a DVD, and the other plays a video game. Now that's entertainment!

Whatever you choose to do with mobile video, whether you install a complex, multi-component system, or simply hang a DVD player/monitor combo on your front seat, once you've entered the world of mobile video, you'll never want to leave.

Headphones For iPod: Which Ones Should I Choose?   by Keith Scott

You've purchased your iPod, the mp3 music player at the cutting edge of technology, and you get it home to listen to some of your favourite music and you find that the sound quality is not what you expected! It's not the player but the headphones for i Pod that are rubbish! The earphones packaged with the music player are nowhere near the best quality, so to get the most out of your shiny new purchase you have to buy a decent pair of new headphones for i Pod. This article aims to give some advice and information on buying a new set of headphones for your i Pod.

There is a huge range of high quality headphones for i Pod available to buy in wide range of styles and prices. There are several factors to consider when looking at new headphones for your iPod. The primary consideration is how the headphones fit. Believe it or not, a bad fitting pair of i Pod headphones can seriously degrade the sound quality you experience.

There are various designs to choose from; ear buds that are similar to the headphones that come packaged with your iPod. Ear buds are relatively uncomfortable and generally are affected by background noise, which means you have to turn the volume up to listen to your music and this can damage your hearing.

The best alternative to the ear bud style are the larger enclosed earphone model with padding that enclose the ear and block out a lot of the background noise, giving a much better sound quality. They come in overhead band or wrap around styles depending on which one is most comfortable for you. Some enclosed headphones feature a noise cancelling feature which, when you switch it on, cancels out any low frequency background noise giving crystal-clear sound quality.

The other style of headphones for i Pod are the Canal Phones. These are designed to fit snugly inside the ear canal, giving better sound quality than the ear bud style. Because they are such a snug fit they are considered to be safer because you don't have to turn up the volume so much so they won't damage your hearing.

You can also buy wireless headphones for i Pod that use Bluetooth technology that give you a great listening experience without all those annoying cables and wires. Whatever your preference and budget, you will be able to find a great pair of iPod headphones that will suit you down to the ground.

About the Author

For the latest information on the best headphones for ipod, visit my website: http://www.headphonesforipod.co.uk

Top 4 Cell Phone Accessories You Need    by Steve Smith

Cell phones are such an integral part of our lives today that they we take them almost for granted. With so much multi-tasking and constant activity in our lives, we rely on them every day, and it's only when they become cumbersome or don't work for us that we realize how much we've come to count on them. The right accessories can improve the functionality and convenience of your cell phone as well as making it the envy of all your friends. These Cheap Cell Phone Accessories are absolute musts for today's best-dressed cell phones.

1. Anything Bluetooth. Bluetooth is simply a term for a low frequency radio wave signal frequency that is used to make any type of electronic equipment - in this case your cell phone - wireless. No more using those awkward wired headphones that you have to plug into your cell phone! Bluetooth earpieces are small, sleek and have enough range for you to walk about your desk or step away from your parked car while chatting away. You can also get Bluetooth car kits for hands free dialing. These allow you to talk all you want while driving with voice activation and dialing. Typical Bluetooth systems give you up to eight hours of talk time and 150 hours of stand-by.

2. Antenna Booster. You would think cell phones would have clear reception and great coverage just about everywhere these days. You'd be wrong. Getting an antenna booster is a simple solution that's inexpensive, easy to install and will widen your coverage area instantly. There's nothing more annoying than a dropped call or talking to someone who's cutting in or out. Weird problems like buildings that block cell phone reception are solved with a good antenna booster as well.

3. Amplifier Antenna. For cell phones that are the life line of road warriors, an amplifier antenna installed on the car is a must. These antennas are more powerful than the antenna boosters installed in the actual cell phones and are mounted on the rear windshield of the car. They give users great coverage in those areas known as "dead zones" between cell towers and in valleys or mountain areas.

4. Mobile phone charger. Yes, this sounds vaguely old-fashioned, but we still believe this is an essential accessory for anyone who travels a lot and talks a lot. After all, why run down your cell phone's battery when you're driving if you can be using a charger and prolonging the battery life for when you get out of your vehicle? The simplest solutions are usually the most elegant, and today's chargers for cell phones are light years beyond those old versions with the big coils and bulky plugs for the cigarette lighter that you could brain someone with. Check out the newer ones that feature slimmer, shorter cords and dashboard mount, drop-in holders for your cell phone.

Almost a quarter of people in the United States today use cell phones as their primary personal telephone. A few added accessories like the ones mentioned above can make them even more reliable and versatile. When you go shopping for your next phone purchase, be sure to look at a few good extras as well as the best Cellular Phone Accessories .

About The Author

Bluetooth Headphones

Bluetooth is a digital standard of wireless communication that carries digital data. Unlike wireless technology that carries data across radio waves, bluetooth differs in the way that it transmits data from one device to another. In order for a bluetooth device to transmit data to another, they must first make a connection, or 'pair up'. Once two devices are paired up, they are free to transmit data between each other. Bluetooth devices require next to no power to operate and have the advantage of being able to transmit other forms of data as well as audio, such as text, images or data.

Bluetooth technology is ideal for headphones due to the fact that you can transmit perfect quality digital audio seamlessly from a base unit to your headphones. You will need a power supply for your headphones, but the charge required is minimal and most headphones come with rechargeable battery packs. You simply plug a transmitter into your mp3 player, plug in your headphones and you are good to go. The audio transmitted is of a perfect digital quality and as long as you invest in a decent pair, will be easily as good as anything you would get from a traditional wired pair of headphones.

So when you are buying a pair of bluetooth headphones, be prepared to spend a little bit of money as the more you are prepared to spend up front, the more you will get in return. You should look for a communciation range of at least 5 to 10 metres, meaning that your music player can be stored safely in a shirt or jean pocket or even tucked away in a rucksack. You should expect a battery life of around 10 hours or more, and if you have a compatible player invest in a unit that comes with a remote control, meaning you need never disturb your music player once you're on the move.

 www.bestheadphones.net

Ten Reasons You Should Use Bluetooth 
By: Christopher Smith 
  
If you are one of the many people who wonder exactly what Bluetooth technology is, you're about to get a brief rundown.

1) Bluetooth provides the ability for items that often need to be hard wired to be completely wireless. It allows you to use your laptop, cell phones, and hand held computer without being limited by cords, wires, and connections. In other words, Bluetooth technology allows portable devices to be truly portable.

2) Bluetooth is a surprisingly affordable option when compared to similar technologies. Because Bluetooth is inexpensive for companies to utilize they are also willing to pass the savings along to consumers.

3) Perhaps the greatest thing about Bluetooth for the average consumer is the fact that it is easy to use. There are no complicated sequences of keys you have to learn in order to make use of your Bluetooth devices.
4) Another winning fact about Bluetooth devices is that they will work with other Bluetooth enabled devices. If you switch from a Motorola phone to a Samsung phone (provided they are both Bluetooth capable) you will not have to be a new set of accessories in order for them to work with your phone.

5) Low interference is another bonus for these devices. People often find that wireless devices receive constant interference by others operating on the same frequencies. This is not an issue with Bluetooth as it utilizes technologies that limit the risk of this occurrence.

6) Lower energy consumption is another benefit of Bluetooth over similar devices. This means you will drain your battery less often or use less electricity in the use of your Bluetooth devices.

7) Bluetooth allows compatible devices to share data and voice communication. This means that you can drive more safely while talking on your cell phone.

8) You have the option of creating a Personal Area Network (PAN) with your Bluetooth device. This network operates within a 30 foot range and can have as many as 7 devices connected.

9) Bluetooth is emerging technology. As such, they are constantly offering better features and services. They are also behaving very wisely in creating consumer loyalty by making their new technologies compatible with existing technologies. This means that you can continuously upgrade your devices.

10) We've seen many fads come and go in the cellular community. Bluetooth, however, seems to be in it for the long haul. They are committed to raising the bar for wireless technology and have in the process gained many loyal customers and fans.

If you rely on cellular technology isn't it time you checked out how Bluetooth could benefit you?
 
Learn more about Bluetooth Headsets and Bluetooth Cell Technology at http://www.discoverbluetooth.com