The elimination of an echo in a two-way voice transmission. Echo is created in the telephone company's central office switch when two-wire lines from the customer are converted to four-wire lines for backbone trunks. The echo is exacerbated over longer distances and by certain kinds of network equipment. A delay of 30ms or more is noticeable, and 50ms is annoying. To eliminate it, the carriers put echo cancellers on their switch ports and in their long-distance trunks at 500 mile intervals.
Using sophisticated DSP circuits that isolate the echo and transmit a reverse frequency to cancel it, echo cancellation is also built into analog modems, speakerphones and quality sound cards. See echo suppression and noise cancellation.
Using sophisticated DSP circuits that isolate the echo and transmit a reverse frequency to cancel it, echo cancellation is also built into analog modems, speakerphones and quality sound cards. See echo suppression and noise cancellation.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Gadget Gal's daily deals: LG Bluetooth car visor, Klipsch speakers, MoviePix camcorder
- An LG Bluetooth hands-free car speaker, a choice of two Klipsch speakers, and a MoviePix digital camcorder. Here are your daily deals for Thursday, October 8, straight from the Gadget Gal: 1. Get the LG MSB-100 Visor Mount Bluetooth Car Kit Hands-Free Speaker for $20, down from...
- Blog posts 2009-10-08
- Jabra Halo
- Most cell phones these days come with stereo Bluetooth because even the more basic handsets have some kind of built-in music player. We're happy to see this development, as it allows us to listen to music cord-free. Still, stereo Bluetooth headsets generally suffer an image problem of being too dorky-looking....
- Product reviews 2009-09-24
- Next Softphone 1.0 (Windows)
- NX is a softphone with a Computer Telephony Integration - CTI tool for Asterisk and third party application. API is based on .INI files, through which one can integrate IP telephony to any CRM / ERP software. FEATURES * SIP Proxy authentication. * Dial/Receive phone calls directly from your contact...
- Software downloads 2009-08-25
- Klipsch unveils S4i, in-ear headphones alternative for iPhone, iPod shuffle
- Klipsch on Tuesday unveiled its Image S4i, an in-ear headset that includes an in-line microphone and remote, positioning the pair as an alternative to Apple's in-ear headphones for the iPhone and iPod touch, nano, classic and shuffle. The headset...
- Blog posts 2009-07-21
- BenQ introduces 13.3-in. thin-and-light Joybook Lite T131 laptop
- BenQ today announced its latest ultraportable netbook, the 13.3-in. Joybook Lite T131, which isn't the lightest (at 3.97 lbs.) or thinnest (1.1 in.) in this segment, but a reasonable thin-and-light option nonetheless. The T131 is intended to be portable,...
- Blog posts 2009-06-16
- Jabra SP200 Bluetooth speakerphone
- Not everyone likes Bluetooth headsets when driving in the car; it can be a pain to wear all the time, and sometimes you can forget to bring it with you. A possible solution is to choose a Bluetooth speakerphone instead, which you can easily hang on your car's visor. Jabra...
- Product reviews 2009-05-20
- Alpine KCE-400BT Bluetooth Adapter
- The Alpine KCE-400BT is part of Alpine's series of add-on modules that, in this case, adds Bluetooth connectivity to receivers that support Alpine's proprietary Ai-NET high-speed connection cable, extending the flexibility of its line of car stereo receivers. However, the KCE-400BT not only adds hands-free calling technology powered by Parrot--makers...
- Product reviews 2009-04-28
- Plantronics Voyager Pro
- Four years after its introduction, the Plantronics Voyager 510 still remains one of the most popular Bluetooth headsets Plantronics has ever released. Despite its outdated design and the many more advanced headsets that have come along to replace it, it seems as if the Plantronics Voyager 510 has earned itself...
- Product reviews 2009-04-22
- SoliCall 1.5.7 (Windows)
- SoliCall has developed a software that reduces background noises from both ends of any voice call. In addition, this software has acoustic echo cancellation capabilities AEC. SoliCall can also record any call. This version is aimed at improving sound quality when making any type of VoIP call (for example, PC-to-PC,...
- Software downloads 2009-04-20
- Sound ID 300 Bluetooth headset
- We are usually big fans of the Sound ID headsets, not only because of the superior sound quality, but also their comfort. Sound ID recently released the Sound ID 200, which is a lot more affordable than the previous Sound ID headsets without compromising sound quality. However, it does not...
- Product reviews 2009-04-13
- CTIA: Jabra introduces new Bluetooth headset, speakerphone
- Mobile accessories favorite Jabra is kicking off this year's CTIA with two new Bluetooth devices: one wireless headset with noise reduction, and one mobile speakerphone. Jabra's HALO stereo wireless headset features what the company calls Noise Blackout technology. Thanks to A2DP technology, the...
- Blog posts 2009-04-01
- LG HBM-310 Bluetooth headset
- If you don't quite care about echo-noise cancellation or multipoint technology in a Bluetooth headset, you could opt for a really cheap one without the frills. The LG HBM-310 is one such headset, and for its price, it's really not that bad. Though it doesn't have the greatest audio quality...
- Product reviews 2009-01-23
- LG HBM-520 Bluetooth headset
- LG has released yet another Bluetooth headset, and this time it is the LG HBM-520. It improves on its predecessors with an ergonomic ear clip, echo noise cancellation, and multiconnection, which lets you connect it with two devices at once. It's not the fanciest Bluetooth headset in the world, but...
- Product reviews 2009-01-16
- LG HFB-500 Bluetooth Solar Car Kit
- Eco-friendly gadgets are all the rage and solar power is one of the easiest ways to conserve energy, so it's no surprise solar-powered gadgets have gathered steam in recent months. Several Bluetooth devices have incorporated solar power, such as the Iqua Sun Bluetooth headset, and the Anycom Bluetooth Solar Car...
- Product reviews 2009-01-14
- Express Talk VoIP Softphone 3.21 (Mac)
- Express Talk is a free VoIP SIP based softphone for Mac OS X. it allows you to call other softphone users for free or normal telephones if you sign up to a SIP Gateway Service. Features: Configure up to 6 lines on the one phone with the ability...
- Software downloads 2009-01-13
- LG HBS-250 stereo Bluetooth headset
- Stereo Bluetooth headsets may not be as popular as their mono cousins, but ever since more cell phones have adopted stereo Bluetooth, they're sure to gain more attention. They're also a good choice for working out at the gym, since you'll have fewer wires that get in your way. The...
- Product reviews 2008-12-18
- Able Planet NC200 Clear Harmony noise-canceling headphones
- Photo gallery:Able Planet NC200 Clear Harmony headphonesFlying the friendly skies has sure gotten a lot more enjoyable with the advent of portable media players, but frequent fliers realize it takes more than a decent MP3 player to deal with nuisance-ridden travel. A good pair of sound-isolating earbuds or noise-canceling headphones...
- Product reviews 2008-10-20
- Express Talk 3.10 (Windows)
- Express Talk lets you make VoIP sip video calls to users anywhere in the world. Call PC to PC for free, all you need is Express Talk installed on each machine, a webcam plus a microphone and speakers. This easy to use softphone lets you see and speak to family...
- Software downloads 2008-10-15
- Parrot Minikit Slim Bluetooth Speakerphone
- With its simple interface and slim profile, the Parrot Minikit Slim is a very attractive looking Bluetooth speakerphone. Dig a little deeper and you'll find an intuitive feature set that makes placing calls from the device simple. However, use the Minikit Slim for an extended period of time and you'll...
- Product reviews 2008-09-23
- Addressing Echo in VoIP Systems: Understanding and Monitoring Echo Cancellation for Optimal VoIP Performance
- Echo is a troubling problem for telecom professionals. Most of them have suffered through a telephone call where they had to try to talk with a lot of echo on the wire. It's very distracting. Voice over IP does not create echo. However, due to the temporal aspect of echo,...
- White papers 2008-09-20
Neighboring Terms
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- The best support in the Linux business
-
If Linux is going to power your mission-critical applications, you'd better have the best support known to business. Novell was rated the top provider of Linux technical support.
- Learn more >>
- Keep Up With The Latest In Document Management with The DocuMentor.
-
> Doc delivers the scoop on today's enterprise content management, printer maintenance, and all other issues related to document management. It's the DocuMentor Blog.
- Learn more >>
- The best support in the Linux business
-
If Linux is going to power your mission-critical applications, you'd better have the best support known to business. Novell was rated the top provider of Linux technical support.
- Learn more >>
- New Online Dashboard for IT Leaders
-
Read about top issues IT decision-makers face every day, plus get cost-effective solutions to real-life IT problems.
- Learn more >>
Popular Sanity Saver Videos
