Methods and apparatus for generating noise signals from speech s

Details Methods and apparatus for generating noise signals from speech s Methods and apparatus for generating noise signals from speech s

1997-04-17

1999-04-06

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

455227, 455228, 455223, G10L 900

Patent

active

058930566

ABSTRACT:
In methods and apparatus for generating an LPC-encoded noise signal from an LPC-encoded speech signal, excitation parameters of the LPC-encoded speech signal for a current frame are randomized upon detection of speech in the current frame. For frames in which no speech is detected, LPC coefficients and frame energy for the current frame may be replaced with respective averages calculated over the current frame and a plurality of preceding frames. For frames in which speech is detected, LPC coefficients for the current frame may be replaced with respective averages of LPC coefficients used to replace LPC coefficients of an immediately previous frame. The comfort noise generation technique is particularly suitable for use in echo suppressors for digital cellular radio systems.

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U.S. Application No. 08/431,224, Chu, et al., filed Apr. 28, 1995.

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