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.
Many new implementations of vocoder algorithms are designed to provide higher-quality voice at lower data rates.
The robust set of vocoders, signaling and control protocols, place us in a strong position to offer a feature-rich, intelligent, converged media platform for IMS networks connecting multiple access networks.
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.
eXpressDSP-compliant vocoders from DSP Wizard on the C55x generation will allow our customers to easily integrate highly optimized algorithms into their own systems," said Christine Wu, C55x product marketing manager.
In conjunction with leading developers of DSP chips, including Texas Instruments, DSPSE provides unique off-the-shelf component solutions such as vocoders, soft-modems, and computer telephony algorithms.
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.
These vocoders have numerous applications in products that require high quality speech coding with low delay at 8 kbps, including videoconferencing, digital telephony, multimedia, wireless communications, digital satellite systems and voice-over-frame relay.
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.
DVSI's low-bit rate vocoders have already been field tested and proven in many wireless communication devices, such as in digital satellite communication systems and digital mobile radio systems around the world today.