Speech coding circuit

Details Speech coding circuit Speech coding circuit

1992-07-15

1994-01-11

Fleming, Michael

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

395 22, 381 36, 381 43, 381 47, G10L 500

Patent

active

052789446

ABSTRACT:
A speech coding circuit is disclosed, which comprises a PCM encoder for converting an analog input into a digital output, and a speech coder with voice activity detector which encodes the digital output from the PCM encoder into speech coding data and detects whether the analog input is voice active or non-active, for each period, and then outputs a speech detection flag indicating whether the analog input is voice active or non-active. A power comparator compares the power of the analog input with a predetermined power threshold value and outputs a level detection flag indicating voice activity or non-activity, depending on whether the power of the analog input is greater or smaller than the power threshold value. A mode switch receives the level detection flag indicating voice activity or non-activity and applies to the PCM encoder and the speech coder a mode control signal which puts them into an activated mode or a sleep mode.

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patent: 5115469 (1992-05-01), Taniguchi et al.
patent: 5129091 (1992-07-01), Yorimoto et al.
patent: 5136652 (1992-08-01), Jibbe et al.

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