Methods for speech transmission

Details Methods for speech transmission Methods for speech transmission

1991-12-03

1993-09-21

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 36, 381 37, 371 51, 371 374, 371 391, G10L 900

Patent

active

052475794

ABSTRACT:
The performance of speech coding in the presence of bit errors is improved. 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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