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speech codec
(redirected from Speech coding)

    Also found in: Wikipedia 0.01 sec.

speech codec

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.



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The ESPrit 3G offers a built-in telecoil that permits wireless access to hearing-aid-compatible telephones and allows listeners to connect to sound systems in public venues with assistive listening devices; the Whisper setting, which improves the audibility of soft and moderate speech; 54 hours of battery life; and all three Nucleus digital speech coding strategies--ACE[TM], CIS, and SPEAK--designed to allow users to hear clearly in all environments.
Speech processor. (Product Marketplace) by Ear, Nose and Throat Journal
and international standards bodies for speech coding for digital cellular systems.
InfoSpace Names Dr. Reed Thorkildsen as VP of Technology and R&D by Business Wire
However, further data are needed to support these findings because they might have been influenced by the extended frequency range and the Hubert transformation used in the CIS+ speech coding strategy.
Recent results with the MED-EL COMBI 40+ cochlear implant and TEMPO+ ... by D'Haese, Patrick / Ear, Nose and Throat Journal
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