vocoder


Also found in: Dictionary, Acronyms, Wikipedia.

vocoder

[vō′kōd·ər]
(electronics)
A system of electronic apparatus for synthesizing speech according to dynamic specifications derived from an analysis of that speech.

Vocoder

 

a system of telephone communication in which the transmitted signals are not those of speech but rather of a special representation of speech in an encoded form. In this system a sound analyzer at the transmitting end forms coded signals from the speech signals; at the receiving end a synthesizer artificially restores the speech signals from the coded signals. With a vocoder it is possible to achieve a coefficient of syllabic articulation of 83 to 85 percent (this coefficient is between 90 and 91 percent for the ordinary telephone communication). The coding reduces the width of the frequency passband required for the communication channel to 250-350 hertz, as compared with the band from 250 to 3,500 hertz of the ordinary telephone communication, thus increasing the carrying capacity of a long-distance communication line by ten to 13 times.

vocoder

(communications)
Hardware or software which implements a compression algorithm particular to voice.

For example Qualcomm uses a vocoding algorithm to compresses voice data in digital communication systems such as wireless CDMA and Eudora voice attach.

vocoder

(VOice CODER) Same as speech codec.
References in periodicals archive ?
Echo cancellation -- The vocoder should not cancel real speech while canceling an echo, nor should it pass echo through without cancellation.
Narrow Band, to provide a network capacity increase of up to 40 percent over the current vocoder solution over existing systems * Wide Band, to offer superior voice quality enhancements * VoIP, to deliver better voice quality over packet networks through integrated Quality of Service (QoS) attributes designed within the core of the codec
We are proud to partner with CML to integrate our leading edge vocoder technology within CML's mixed-signal IC's.
We are enthusiastic to work with Texas Instruments to enable customers a rapid integration process for our vocoders.
In this new phase of the program, BBN will develop a noise robust vocoder operating at the ultra-low data rate of 300 bps.
729B CS-ACELP vocoder is an international standard for encoding 8 kHz sampled speech signals for transmission over 8 kbps channels.
DSPSE) of Bedford, MA, a leading provider of digital signal processing software, announces the availability of its latest vocoder software component products; ITU G.
The AMBE vocoder uses a patented DVSI speech compression technology that provides telephone quality speech at compression ratios up to 27:1.
DALLAS, June 25 /PRNewswire/ -- QUALCOMM Incorporated (Nasdaq: QCOM) today announced the next generation Mobile Station Modem (MSM 22) Application Specific Integrated Circuit (ASIC) with the new 13 Kilobit and 8 Kilobit PureVoice(TM) vocoder.
This is the first public CTIA demonstration of the 13 kb/s vocoder being used in a commercial PCS application," said Scott Erickson, vice president of marketing, wireless systems, Lucent Technologies.
DigiCall(TM) offers both a standard full rate GSM vocoder as well as an Audio Codex Ltd.
Test comparisons in 1991 on the USDC 8KB vocoder to the ultimately selected 4.