Comfort noise generator, using summed adaptive-gain parallel cha

Details Comfort noise generator, using summed adaptive-gain parallel cha Comfort noise generator, using summed adaptive-gain parallel cha

1998-03-11

2000-08-22

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

G10L 1904

Patent

active

061086231

ABSTRACT:
A device for generating comfort noise for an LPC speech decoder which replaces silent periods with noise for a distant listener. The device includes and encoder for determining the energy characteristics of the frames of a signal to be transmitted, and a device for estimating LPC coefficients. The energy characteristics and the LPC coefficients are transmitted to a decoder which includes a comfort noise generator adding the outputs of parallel adaptive gain definition channels filtering a Gaussian noise. The received energy characteristics and LPC coefficients are used to fix the gain and weighting in these channels.

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Internationale Des Telecommunications (ITU), "Draft Recommendation G. 723- Dual Rate Speech Coder for Multimedia Telecommunication Transmitting at 5.3 and 6.3 KBITS/S", ITU, Study Group 15, 1995, 10th "LBC" Meeting, Newton, MA., USA.

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