System for transmitting coded speech signals

Details System for transmitting coded speech signals System for transmitting coded speech signals

1995-07-21

1999-06-15

Tse, Young T.

Pulse or digital communications

Pulse code modulation

Noise or distortion reduction

375285, 370290, 379410, 381 711, 381 7112, H04B 323, H04M 908

Patent

active

059129239

ABSTRACT:
Complex coding of speech signals, as this is used, for example, in the GSM half rate speech coder, requires the use of a signal processor. On the other hand, a hands-free facility requires an arithmetic unit which adaptively calculates filter coefficients. This is only effected during speech pauses in which the speech coder is switched to a mode in which it generates codes for background noise with only little processing circuitry and expense. According to the invention, the signal processor for the coding device is therefore used for calculating the coefficients for the echo cancelling filter during speech pauses. This requires the use of not more than a single signal processor which can thus be used twice.

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