Printer Friendly
The Free Dictionary
1,083,660,478 visitors served.
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

speech codec

   Also found in: Acronyms, Wikipedia 0.06 sec.

Also called a "voice codec" or "vocoder," it is a hardware circuit that converts the spoken word into digital code and vice versa. It comprises the A/D and D/A conversion and compression technique (see G. standards). If music is encoded with a speech codec, it will not sound as good when decoded at the other end.

Specialized for Voice
A speech codec is an audio codec designed for human voice. By analyzing vocal tract sounds, a recipe for rebuilding the sound at the other end is sent rather than the soundwaves themselves. The speech codec is able to achieve a much higher compression ratio, which results in a smaller amount of digital data for transmission. When telephones were first digitized in the early 1960s, they generated digital streams of 64 Kbps (see PCM). Since then, speech codecs have reduced voice to as little as 5 Kbps and less. See audio codec, sampling, codec examples and codec.



How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link
 Email
Feedback
? Mentioned in ? References in periodicals archive
 
SmartStack VoIP includes the speech codec to manage the voice compression and decompression, the Internet protocols stack, and the physical layer software (soft modem for PSTN or soft MAC for Ethernet LANs).
EDEVICE ANNOUNCES INDUSTRY'S FIRST VOICE-ENABLED INTERNET MODEM FOR ... by EDP Weekly's IT Monitor
729 speech codec for the development of their next generation VoIP enabled products," stated Larry Przywara, Tensilica's director of mobile multimedia products.
Tensilica Adds G.729AB Speech Codec for Its Popular HiFi 2 Audio ... by Business Wire
AMR is the standard speech codec adopted by the Third Generation Partnership Project, or 3GPP.
Mindspeed(R) Announces Next-Generation High-Density Comcerto(TM) VoIP ... by Business Wire
More results
 
Encyclopedia browser? ? Full browser
 
 
Encyclopedia
?

Disclaimer | Privacy policy | Feedback | Copyright © 2008 Farlex, Inc.
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.. Terms of Use.