Methods for speech transmission

Details Methods for speech transmission Methods for speech transmission

1995-05-03

1996-02-13

Knepper, David D.

Excavating

395 238, 371 374, G10L 500

Patent

active

054917727

ABSTRACT:
The quantized parameter bits are grouped into several categories according to their sensitivity to bit errors. More effective error correction codes are used to encode the most sensitive parameter bits, while less effective error correction codes are used to encode the less sensitive parameter bits. This method improves the efficiency of the error correction and improves the performance if the total bit rate is limited. The perceived quality of coded speech is improved. A smoothed spectral envelope is created in the frequency domain. The ratio between the actual spectral envelope and the smoothed spectral envelope is used to enhance the spectral envelope. This reduces distortion which is contained in the spectral envelope.

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