Method for improving the voice quality in low-rate dynamic bit a

Details Method for improving the voice quality in low-rate dynamic bit a Method for improving the voice quality in low-rate dynamic bit a

1997-07-18

1998-11-24

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704205, 704265, G10L 0000

Patent

active

058421602

ABSTRACT:
Voice quality is improved in low-rate dynamic bit allocation sub-band coding (DBASC) by inserting synthetic filler signals for non-transmitted signal bands. Large spectral holes may exist in an output voice speech spectrum of DBASC with a low transmission rate. The holes are caused by low energy signal sub-bands that are not transmitted and create noticeable artifacts in the received voice signal. To avoid these artifacts, the spectral holes in the received signal are filled with synthetic signals generated from the received signal. The synthetic filler signals are signals from transmitted energy bands that are scaled to the energy level of the non-transmitted band.

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