Speech coding definition of Speech coding in the Free Online Encyclopedia.

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.

Mentioned in	?		References in periodicals archive	?		Encyclopedia browser	?		Full browser	?
No references found	The patents cover wireless data, speech coding, security and encryption and are infringed by all Apple iPhone models shipped since the iPhone was introduced in 2007," Nokia said in a statement. Mobile phone giant Nokia sues Apple over patents by AFP / AFP American Edition The patents cover wireless data, speech coding, security and encryption and are infringed by all Apple iPhone models shipped since the iPhone was introduced in 2007," Nokia said in a statement. Mobile phone giant Nokia sues Apple over patents by AFP / AFP Global Edition He conducted research in various speech and audio processing, speech coding, and voice systems applications at AT&T Bell Laboratories and AT&T Labs until his retirement from AT&T in May 2008. On June 30, 2008, Richard V. Cox stepped down from his position as ... by Journal of Visual Impairment & Blindness	specular surface specular transmittance specularia specularite Speculation speculative builder speculative evaluation speculative execution Speculative Knowledge Speculative Promotion speculum speculum alloy Speculum Ducks specus Spee, Maximilian Von Spee, Maximilian, Graf von Speech speech act theory speech amplifier Speech Application Programming Interface speech bandwidth speech clipper speech clipping speech codec speech coder Speech coding speech coil speech compression Speech Culture speech day speech defect speech frequency Speech from the Throne speech intelligibility speech interference level speech interpolation speech inverter Speech Mechanisms Speech perception speech recognition Speech Recognition Application Program Interface speech scrambler Speech Sounds speech synthesis speech therapy Speech, Artistic Speech, Dramatic speech, freedom of speed speed buffering speed camera	Speech and Language Technology for Disabled Persons Speech and Language Technology for MInority Languages Speech and Language Therapist Speech and Language Therapist/Therapy Speech and Language Therapy Assistant Speech and Speech Disorders Speech Anxiety Speech API Speech Application Language Tags Speech Application Programming Interface Speech Application Programming Interface Speech Application Software Development Kit Speech Assessment Methods Phonetic Alphabet Speech Assisted Reading and Writing speech audiometry speech audiometry speech audiometry Speech Automatic Friendly Interface Research Speech Awareness Threshold speech bandwidth speech bulb speech centers speech centre speech clipper speech clipping Speech codec Speech coder Speech coding Speech Coding Experts Group Speech Coding Workshop speech coil speech communication speech communication Speech Communication Association of Ohio Speech Communication Association of Puerto Rico Speech Communication Interaction Portal Speech Communication Interaction Program Speech Communication, Theatre and Dance Speech Communications Speech Communications Index Meter Speech communities speech community Speech compression Speech Corrector Speech Culture speech day speech day speech days speech days speech defect speech defect speech defect speech defect speech deficit speech deficit speech deficit speech deficit Speech delay

Mentioned in

References in periodicals archive

Encyclopedia browser

Full browser

No references found

The patents cover wireless data, speech coding, security and encryption and are infringed by all Apple iPhone models shipped since the iPhone was introduced in 2007," Nokia said in a statement.

Mobile phone giant Nokia sues Apple over patents by AFP / AFP American Edition

The patents cover wireless data, speech coding, security and encryption and are infringed by all Apple iPhone models shipped since the iPhone was introduced in 2007," Nokia said in a statement.

Mobile phone giant Nokia sues Apple over patents by AFP / AFP Global Edition

He conducted research in various speech and audio processing, speech coding, and voice systems applications at AT&T Bell Laboratories and AT&T Labs until his retirement from AT&T in May 2008.

On June 30, 2008, Richard V. Cox stepped down from his position as ... by Journal of Visual Impairment & Blindness

specular surface

specular transmittance

speculative evaluation

speculative execution

Speculative Knowledge

Speculative Promotion

speculum