vocoder

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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 ?
I was never comfortable with it, and so the vocoder came with the idea of being able to not only be comfortable playing live, but being able to get exactly what I wanted out of my voice.
The IPM-260, a complete VoIP media server solution, supports up to 240 ports per blade with support of vocoders such as: EVRC, AMR and G.
The variety of vocoder support, signaling protocols and voice quality of the TP-260 and IPM-260 in combination with platforms such as BladeCenter allow customers to enjoy those benefits".
Many new implementations of vocoder algorithms are designed to provide higher-quality voice at lower data rates.
Agilent's implementation of the PESQ measurement predicts vocoder speech quality using the algorithm recommended by the ITU-T P.
Smaller is definitely better in this case, although smaller delays increase the processing requirements for the 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.
All devices in the MSP family support PMC-Sierra's Voice Processing Module firmware that provides the necessary VoIP functions for high-quality VoIP services, including vocoders (G.
SPIRIT's mobile voice engine includes echo and noise canceling, jitter buffer, PLC and vocoders and helps mobile OEMs to quickly deliver mass products for the voice over Wi-Fi market.
Trinity VeriCall(R) software is using SPIRIT vocoders since 2005.
SPIRIT vocoders are also shipping within Trinity software framework for mobile OEMs.
In the current configuration, each base station can only reach a single SDU; therefore, each SDU pool must be large enough so that a call can reach a vocoder when needed.