Methods for speech quantization and error correction

Details Methods for speech quantization and error correction Methods for speech quantization and error correction

1990-12-05

1993-07-06

Richardson, Robert L.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 381 36, 381 37, 381 46, 381 50, 381 51, 381 51, 381 52, G10L 500, G10L 300, G10L 502, G06F 1100

Patent

active

052260844

ABSTRACT:
The redundancy contained within the spectral amplitudes is reduced, and as a result the quantization of the spectral amplitudes is improved. The prediction of the spectral amplitudes of the current segment from the spectral amplitudes of the previous is adjusted to account for any change in the fundamental frequency between the two segments. The spectral amplitudes prediction residuals are divided into a fixed number of blocks each containing approximately the same number of elements. A prediction residual block average (PRBA) vector is formed; each element of the PRBA is equal to the average of the prediction residuals within one of the blocks. The PRBA vector is vector quantized, or it is transformed with a Discrete Cosine Transform (DCT) and scalar quantized. The perceived effect of bit errors is reduced by smoothing the voiced/unvoiced decisions. An estimate of the error rate is made by locally averaging the number of correctable bit errors within each segment. If the estimate of the error rate is greater than a threshold, then high energy spectral amplitudes are declared voiced.

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