Band Wireless
A Glance At A Few Of The Most Recent Wireless Audio Devices
Lately a great number of wireless audio products have emerged such as latest-generation wireless headphones, iPods, cell phones and wireless amplifier devices which promise to cut the cable. I will examine if these products keep their claim to provide perfect-quality audio. Furthermore, I will examine the underlying technologies.
Some products are available with wireless already built in while some others, in particular streaming audio products, frequently have optional wireless capability. Newer cell phones and MP3 players already come with support for wireless. iPhones and touch-screen iPods, as an example, have Bluetooth and WiFi.
The Bluetooth protocol is a relatively low-cost option. Yet, its drawbacks have an impact on high-quality audio applications and are often overlooked.
1) Limited range
The range of Bluetooth devices is typically just 30 ft. This excludes Bluetooth from multi-room applications.
2) Inadequate data transmission capacity
Bluetooth reliably supports data transmission rates of roughly 1 Mbps only which is not adequate for uncompressed CD-quality audio. Thus Bluetooth uses audio compression. Audio compression will deteriorate the audio quality to some degree. High-quality audio transmission typically does not tolerate this kind of distortion. Therefore Bluetooth is usually not used in high-end audio products.
3) Audio delay
The signal broadcast via Bluetooth will bear a slight delay of no less than 10 ms. This is mostly due to the audio compression. While being uncritical for MP3 players, this delay may be a dilemma for video and other real-time applications.
4) Lacking multi-headphone support
Bluetooth is relatively limited regarding supporting streaming to multiple headphones. Streaming to numerous headphones is helpful for numerous people wanting to listen to the same transmitter. This is less of a problem for MP3 player applications.
WiFi is an additional commonly used wireless protocol that is also suitable for audio streaming. WiFi does support uncompressed audio but will have limitations broadcasting to a high number of wireless receivers simultaneously. Because of the fairly high power consumption it is rarely used in wireless headphones however. WiFi is convenient for streaming audio from a PC however since almost all PCs have WiFi access.
Wireless speakers and wireless amplifier products for home theater speakers usually utilize their own proprietary protocol. Entry-level wireless headphones and speakers generally still utilize FM transmission which offers low cost but is prone to noise and audio degradation.
Newer wireless audio protocols avoid audio degradation by utilizing digital transmission. These often also have mechanisms such as forward error correction to deal with interference from other wireless devices.
Latest-generation wireless amplifiers employ uncompressed audio transmission. Latest protocols also allow streaming to an unlimited number of receivers. This enables whole-house audio distribution.
The audio latency ranges from below 1 ms to up to 20 ms. A small latency is vital for wireless surround sound applications. Wireless audio transmitter products usually operate at 2.4 GHz or sometimes in the less crowded 5.8 GHz frequency band including Amphony's wireless audio devices.
Wireless amplifiers offer different levels of audio quality, output power and standby power. Wireless Class-D amplifiers normally have standby power of 5 Watts or less and a power efficiency of greater than 80% but sometimes high audio distortion. It is vital to pick a wireless amplifier with low audio distortion. This will ensure good sound quality. High-quality amplifiers have audio distortion of 0.05% or less.
Linksys WRT610N Simultaneous Dual Band Wireless 802.11n Router w/ Attached Storage (Review)
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West Bend Electric Can Openers West Bend, 70W, Black, Tall Extra Slim Electric Can Opener, Features Built In Knife Sharpener & Bottle Opener, Detachable Chrome Cutting Accessory Is Dishwasher Safe, Cord Storage In Base, Auto Shut Off, 1 Year Warranty.... |
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West Bend 41300 Hi-Rise Electronic Dual-Blade Breadmaker $80.00 The West Bend dual-paddle breadmaker offers 11 program settings, including a homemade setting which allows you to set your own breadmaking preferences. It also has the dual knead bar for lighter tasting breads, and a 1, 1.5, or 2 lb capacity.... |
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West Bend Digital Timer, White $17.99 Features: LCD readout. Electronic alarm. AAA battery included. Counts up to 100 hours. Counts down in minutes and seconds from 100 hours. Recalls previous time setting. Includes clip, stand, magnet and hanging hole for ease in use.... |
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Dremel 7700-1/15 MultiPro 7.2-Volt Cordless Rotary Tool Kit $43.92 Ready to go at a minute's notice, the Dremel 7700-1/15 MultiPro Cordless Rotary Tool Kit is perfect for a variety of hobby, craft, and light-duty home improvement projects. The two-speed rotary tool is capable of doing almost anything the standard MultiPro does, but with cordless convenience. The kit comes with a carrying case, battery pack, charger, one attachment, and 15 accessories that give yo... |
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Cisco-Linksys Wireless-N Internet Home Monitoring Camera $129.99 Send live audio and video to a smartphone or web browser anywhere in the world! The Cisco-Linksys wireless-N internet home monitoring camera connects to your network wirelessly, and delivers a live audio/video stream to a smartphone or browser anywhere. Also captures video streams and sends email alerts with video clips upon motion detection.... |
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Smarthome 2476D SwitchLinc INSTEON Remote Control Dimmer, White $45.99 ... |
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Fitbit Ultra Wireless Activity Plus Sleep Tracker ... |
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GARMIN 010-10997-00 Heart Rate Monitor $69.99 GARMIN® HEART RATE MONITOR WATERPROOF SOFT STRAP :: Replace your old heart rate monitor strap or add it to your current heart rate compatible Garmin® sport watch. This heart rate strap is waterproof and features an advanced heart rate monitor sensor and comfortable, adjustable stretch strap.... |
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Omron HR-100C Heart Rate Monitor $33.00 ACCURATE HEART RATE READINGS INSTANTLY DISPLAYED ON WATCH RECEIVER WHILE WEARING TRANSMITTERALARM OPTION TO INDICATE HIGH & LOW PERSONAL HEART RATE LIMITSMOUNTING BRACKET INCLUDED TO ALLOW WATCH RECEIVER TO BE DISPLAYED ON MOST TREADMILLS & BICYCLESADJUSTABLE TRANSMITTER STRIP FITS TORSO 12" 44" FOR ADDED COMFORTWATER RESISTANT WATCH & TRANSMITTER APPROXIMATELY TO 30 MSTOPWATCH FUNCTION TIME/DAY D... |
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Blue Microphones Icicle XLR to USB Mic Converter/Mic Preamp $41.94 The Icicle is Blue's new stylish USB converter and mic preamp combo that allows you to connect any XLR microphone directly into your computer via USB. The Icicle features a studio quality microphone preamp, 48V phantom power, fully balanced low noise front end, analog gain control, and driverless operation. Connect any XLR microphone directly into your computer via USB. Click to... |
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A8000 3.6" Touch Screen MTK6516 Andriod 2.2 Phone Quad Band Dual SIM Wifi GPS TV Java - Red $95.99 Basic InformationModelA8000BandGSM850/900/1800/1900MHZSim CardDual Sim Card Dual StandbyService ProvideUnlockedStyleBarColorRedShell MaterialPlasticSystemCPUMTK6516 416MHZO.SAndroid 2.2.1ROM256MBRAM256MBScreenDisplay Size3.6 Resistive Touch ScreenTypeWQVGAResolution240*400 pxScreen Color260K ColorsSupport FormatRingtones TypePolyphonic/MP3Audio File FormatMP3/WAV/AMR/AWBVideo File Format3GP/MPEG4Image File FormatJPEG/BMP/GIF/PNG/GIFE-book FormatTXT/CHM/DOC/HTMFM RadioYes,please plug the earphone firstEarphone Port3.5mm port Card ExtendSupport TF card , up to 8GB??extendedData Transfer &??ConnectivityData transferUSB/BluetoothMobile internetWifi/GPRSGeneral Camera/Pictrue??Resolution1.3Mega pixel camera??for picture & video put out biggest size is 1600*1200LanguageEnglish,??Chinese,French,??Spanish, Deutsch, Portuguese, Italian, Bahasa Melayu, Bahasa??Indonesia, Thai, Arabic,??Turkish, Indonisian, Russian, VietnemesePhonebook500 EntriesMessageSMS/MMSInputHandwrite/Kerboard Wifi:Yes ,802.11b/gGPSYes, Support A-GPSTVYes,Free Analog TVJAVAYes ,Java 2.0BluetoothBluetooth 2.0Gravity SensorYes,Support pictures and gamesMulti-touchNoDimensions108 x 55 x 12 mmNet Weight(Including battery)120gOther??FeatureWiFi, A-GPS, Analog??Mobile??TV, Java , Android Market, Voice Search, Wireless Keyboard, MP3,MP4,????Voice Recorder,FM Radio, Bluetooth, Calendar, Ebook, Tasks, Alarm,????Calculator, Currency conversion, Stop Watch, World clockPackageSize135 x 80 x 65 mmWeight350gAccessories1 x 3.5mm earphone with Microphone1 X AC power charger1 X USB cable2 x batteries |
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A818 3.5" Capacitive Multi-Touch Screen MTK6516 Android 2.2 w/ Quad Band Dual Camera GPS TV $179.99 Basic InformationModelA818BandGSM850/900/1800/1900MHZSim CardSingle SIM CardService ProvideUnlockedStyleBarColorBlackShell MaterialPlasticSystemCPUMTK6516 416MHZO.SAndroid 2.2ROM256MBRAM256MBScreenDisplay Size3.5 Inch TypeCapacitive Multi-TouchResolution320*480 pxScreen Color260K ColorsSupport FormatRingtones TypePolyphonic/MP3Audio File FormatMP3/WAV/AMR/AWBVideo File Format3GP/MPEG4Image File FormatJPEG/BMP/GIF/PNG/GIFE-book FormatTXT/CHM/DOC/HTMFM RadioYes,please plug the earphone firstEarphone Port3.5mm port Card ExtendSupport TF card , up to 8GB??extendedData Transfer &??ConnectivityData transferUSB/BluetoothMobile internetWifi/GPRSGeneral Camera/Pictrue??ResolutionDual Camera for????picture & video,The back camera is 2.0 Mega pixel with flashlight??,the??front camera is 0.3 mega pixel; The size of pictures is up to??1600*1200LanguageEnglish,??Chinese,French, Spanish, Deutsch, Portuguese, Turkish, Russian, PolishPhonebook500 EntriesMessageSMS/MMSInputHandwrite/Kerboard Wifi:Yes ,802.11b/gGPSYes, Support A-GPSTVYes,Free Analog TVJAVAYes ,Java 2.0BluetoothBluetooth 2.0Gravity SensorYes,Multi-touchYesDimensions115 x 65 x 12 mmNet Weight(Including battery)120gOther??FeatureWiFi, A-GPS,??Analog??Mobile TV, Java , Android Market, Voice Search, Wireless??Keyboard, MP3,MP4,??Voice Recorder,FM Radio, Bluetooth, Calendar,??Ebook, Tasks, Alarm,??Calculator, Currency conversion, Stop Watch,??World clockPackageSize150 x 110 x 50 mmWeight410gAccessories1 x 3.5mm earphone with Microphone1 X power charger1 X USB cable1 x battery |
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B1000 3.5" Touch Screen MTK6516 Android 2.2 Smart Phone Quad Band A-GPS WiFi TV - Red $90.99 Basic InformationModelB1000BandGSM850/900/1800/1900MHZSim CardDual Sim Card Dual StandbyService ProvideUnlockedStyleBarColorRedShell MaterialPlasticSystemCPUMTK6516 460MHZ+280MHZRAM256MBROM256MBScreenDisplay Size3.5 InchResolution320X480pxScreen Color260K ColorsSupport FormatRingtones TypePolyphonic/MP3Audio File FormatMP3/WAV/AMR/AWBVideo File Format3GP/MPEG4Image File FormatJPEG/BMP/GIF/PNG/GIFE-book FormatTXT/CHM/DOC/HTMFM RadioYes,Can play without earphoneEarphone Port3.5mm portCard ExtendSupport TF card , up to 16GB??extendedData Transfer &??ConnectivityData transferUSB/BluetoothMobile internetWIFI/WAPGeneral Camera/Pictrue??ResolutionSupport dual??cameras,The back camera is 2.0MP with flashlight ,picture size up to??1600*1200 resolutionï¼support??DV function .The front camera is 0.3MPLanguageEnglish,??Spanish,??Portuguese, French, Russian,Persian,Italiano, Deutsch,??Bahasa Melayu, Bahasa??Indonesia, Turkish, Vietnemese,Phonebook500 EntriesMessageSMS/MMSInputhandfree/keypadBluetoothBluetooth 2.0WifiYes ,wireless 802.11b/gGPSYes,A-GPSTVYes ,Analog TVJavaYes ,Java 2.0G-SensorYesMulti-touchNoAlarm clock:5 groups,can work when power off ,set from Monday to SundayDimensions120 x 63 x 11 mmNet Weight(Including battery)130gOther FeatureWifi??, A-GPS, Facebook??, Analog TVOpera Mini , eBuddy, Java 2.0 , MP3,MP4??Player, WAP, FM Radio,??Bluetooth, GPRS, MMS,Calendar, Ebook, Alarm,??Calculator, Currency ,World??clockPackageSize155 x 90 x 50 mmWeight355gAccessories1 X Power charger1 X Earphone1 X USB Data transfer1 X Back protector case2 x Battery |
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B1000 3.5" Touch Screen MTK6516 Android 2.2 Smart Phone Quad Band A-GPS WiFi TV - White $90.99 Basic InformationModelB1000BandGSM850/900/1800/1900MHZSim CardDual Sim Card Dual StandbyService ProvideUnlockedStyleBarColorWhiteShell MaterialPlasticSystemCPUMTK6516 460MHZ+280MHZRAM256MBROM256MBScreenDisplay Size3.5 InchResolution320X480pxScreen Color260K ColorsSupport FormatRingtones TypePolyphonic/MP3Audio File FormatMP3/WAV/AMR/AWBVideo File Format3GP/MPEG4Image File FormatJPEG/BMP/GIF/PNG/GIFE-book FormatTXT/CHM/DOC/HTMFM RadioYes,Can play without earphoneEarphone Port3.5mm portCard ExtendSupport TF card , up to 16GB??extendedData Transfer &??ConnectivityData transferUSB/BluetoothMobile internetWIFI/WAPGeneral Camera/Pictrue??ResolutionSupport dual??cameras,The back camera is 2.0MP with flashlight ,picture size up to??1600*1200 resolutionï¼support??DV function .The front camera is 0.3MPLanguageEnglish,??Spanish,??Portuguese, French, Russian,Persian,Italiano, Deutsch,??Bahasa Melayu, Bahasa??Indonesia, Turkish, Vietnemese,Phonebook500 EntriesMessageSMS/MMSInputhandfree/keypadBluetoothBluetooth 2.0WifiYes ,wireless 802.11b/gGPSYes,A-GPSTVYes ,Analog TVJavaYes ,Java 2.0G-SensorYesMulti-touchNoAlarm clock:5 groups,can work when power off ,set from Monday to SundayDimensions120 x 63 x 11 mmNet Weight(Including battery)130gOther FeatureWifi??, A-GPS, Facebook??, Analog TVOpera Mini , eBuddy, Java 2.0 , MP3,MP4??Player, WAP, FM Radio,??Bluetooth, GPRS, MMS,Calendar, Ebook, Alarm,??Calculator, Currency ,World??clockPackageSize155 x 90 x 50 mmWeight355gAccessories1 X Power charger1 X Earphone1 X USB Data transfer1 X Back protector case2 x Battery |
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B1000 3.5???Touch Screen MTK6516 Android 2.2 Smart Phone Quad Band A-GPS WiFi TV $90.99 Basic InformationModelB1000BandGSM850/900/1800/1900MHZSim CardDual Sim Card Dual StandbyService ProvideUnlockedStyleBarColorBlackShell MaterialPlasticSystemCPUMTK6516 460MHZ+280MHZRAM256MBROM256MBScreenDisplay Size3.5 InchResolution320X480pxScreen Color260K ColorsSupport FormatRingtones TypePolyphonic/MP3Audio File FormatMP3/WAV/AMR/AWBVideo File Format3GP/MPEG4Image File FormatJPEG/BMP/GIF/PNG/GIFE-book FormatTXT/CHM/DOC/HTMFM RadioYes,Can play without earphoneEarphone Port3.5mm portCard ExtendSupport TF card , up to 16GB??extendedData Transfer &??ConnectivityData transferUSB/BluetoothMobile internetWIFI/WAPGeneral Camera/Pictrue??ResolutionSupport dual??cameras,The back camera is 2.0MP with flashlight ,picture size up to??1600*1200 resolution，support??DV function .The front camera is 0.3MPLanguageEnglish,??Spanish,??Portuguese, French, Russian,Persian,Italiano, Deutsch,??Bahasa Melayu, Bahasa??Indonesia, Turkish, Vietnemese,Phonebook500 EntriesMessageSMS/MMSInputhandfree/keypadBluetoothBluetooth 2.0WifiYes ,wireless 802.11b/gGPSYes,A-GPSTVYes ,Analog TVJavaYes ,Java 2.0G-SensorYesMulti-touchNoAlarm clock:5 groups,can work when power off ,set from Monday to SundayDimensions120 x 63 x 11 mmNet Weight(Including battery)130gOther FeatureWifi??, A-GPS, Facebook??, Analog TVOpera Mini , eBuddy, Java 2.0 , MP3,MP4??Player, WAP, FM Radio,??Bluetooth, GPRS, MMS,Calendar, Ebook, Alarm,??Calculator, Currency ,World??clockPackageSize155 x 90 x 50 mmWeight355gAccessories1 X Power charger1 X Earphone1 X USB Data transfer1 X Back protector case2 x Battery |
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Black Wireless WIFI Network Adapter for Microsoft XBOX 360 $41.9 The Xbox360 Wireless N Networking Adapter is your cord-free connection to Xbox LIVEQuickly access HD moviesTV episodesgame demos Game Add-onsand moreBroadly compatible and blazing fastthe compact adapter fits onto the back of your consoleContents:Wireless N Networking AdapterUser ManualDriver CD-ROMIntegrated Stand for Off-Board Placement 1. Dual band 5 GHz and 2.4 GHz Wireless A/B/G home network compatible2. Compact, high-performance design3. Powered by Xbox 360 to eliminate adapter clutter4. Windows Vista Media Center compatible5. Streams photos and music from Microsoft Windows XP and recorded TV, movies, and videos from your Microsoft Windows XP Media Center - based PC |
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F603 2.8" Touch Screen MTK6516 Android 2.2 Smart Phone Quad Band A-GPS WiFi - Black $99.99 Basic InformationModelF603BandGSM850/900/1800/1900MHZSim CardDual Sim Card Dual StandbyService ProvideUnlockedStyleBarColorBlackShell MaterialPlasticSystemCPUMTK6516 460MHZ+280MHZRAM512MBROM256MBScreenDisplay Size2.8 InchResolution240 *320 pxScreen Color260K ColorsSupport FormatRingtones TypePolyphonic/MP3Audio File FormatMP3/WAV/AMR/AWBVideo File Format3GP/MPEG4Image File FormatJPEG/BMP/GIF/PNG/GIFE-book FormatTXT/CHM/DOC/HTMFM RadioYes,Need play with earphoneEarphone PortData transfer portCard ExtendSupport TF card , up to 16GB??extendedData Transfer &??ConnectivityData transferUSB/BluetoothMobile internetWIFI/WAPGeneral Camera/Pictrue??ResolutionSupport dual??cameras,The back camera is 2.0MP with flashlight ,picture size up to??1600*1200 resolutionï¼support??DV function .The front camera is 0.3MPLanguageEnglish,??Spanish,??Portuguese, French, Russian,Persian,Italiano, Deutsch,??Bahasa Melayu, Bahasa??Indonesia, Turkish, Vietnemese,Phonebook500 EntriesMessageSMS/MMSInputhandfree/keypadBluetoothBluetooth 2.0WifiYes ,wireless 802.11b/gGPSYes,A-GPSTVNoJavaYes ,Java 2.0G-SensorYesMulti-touchNoAlarm clock:5 groups,can work when power off ,set from Monday to SundayDimensions100 x 55 x 11 mmNet Weight(Including battery)95gOther FeatureWifi??, A-GPS, Facebook??, Opera Mini , eBuddy, Java 2.0 , MP3,MP4 Player,??WAP, FM Radio, Bluetooth,??GPRS, MMS,Calendar, Ebook, Alarm,??Calculator, Currency ,World clockPackageSize160 x 100 x 63 mmWeight355gAccessories1 X Power charger1 X Earphone1 X USB Data transfer2 x Battery |
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Wireless WIFI Network Adapter & Wireless Controller & Cables & Headset for XBOX 360 Bundle $79.99 The discount bundle includes the following productsXbox360 Wireless ControllerXbox360 HeadsetXbox360 HD Component Cables Xbox360 Wireless WIFI Network Adapterthe box package is not included Xbox360 Wireless Controller???.2.4GHz wireless technology with 30-foot range2.Lag-free play3.Integrated headset port for Xbox Live play4.Adjustable vibration feedback for longer battery life5.New left and right shoulder buttons are designed for ease of use.6.The Xbox Guide Button at the centre of the controller gives you quick access to all your favorite Xbox 360 system activities Xbox360 Headset???.Noise-cancelling microphone improves game response to voice commands, and provides crisp and clear voice communication2.Plug this headset headphone directly to Xbox 360 controller3.The microphone strengthen the function and can carry on regulate, obtain the best sound quality Xbox360 HD Component Cables ???.Designed to provide the sharpest sound and video for your Xbox360 system 2.Connect to your Hi-Def TV and enjoy HD graphics 3.Can be used for standard televisions by just using the yellow, white and red connectors 4.Connections: Microsoft XBox 360 AV Plug to Component Y/Pr/Pb, L-channel, R-channel (Male), Composite video Xbox360 Wireless WIFI Network Adapter:1. Dual band 5 GHz and 2.4 GHz Wireless A/B/G home network compatible2. Compact, high-performance design3. Powered by Xbox 360 to eliminate adapter clutter4. Windows Vista Media Center compatible5. Streams photos and music from Microsoft Windows XP and recorded TV, movies, and videos from your Microsoft Windows XP Media Center - based PC |
