Digital signal encoding with quantizing based on masking from mu

Details Digital signal encoding with quantizing based on masking from mu Digital signal encoding with quantizing based on masking from mu

1991-04-16

1992-10-20

MacDonald, Allen R.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 31, G01L 918, G01L 900

Patent

active

051577607

ABSTRACT:
An allowable noise level is set for each frequency band of the input digital signal on the basis of the energy level of the respective frequency band and that of another frequency band. The energy level and the allowable noise level are non-linearly related so as to enable high data compression and to provide a satisfactory sound. The signal components of each of the frequency bands are quantized with a number of bits which correspond to the difference between the energy level of each frequency band and the allowable noise level. If the input digital signal is preemphasized, the signal is corrected for preemphasis prior to the setting of the allowable noise level, so that the quantization is performed on a signal which is free from the effects of preemphasis.

REFERENCES:
patent: 4140876 (1979-02-01), Gagnon
patent: 4455649 (1984-06-01), Esteban et al.
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 4932063 (1990-06-01), Nakamura
patent: 4942607 (1990-07-01), Schroder et al.
Boll, "Suppression of Acoustic Noise in Speech Using Spectral Subtraction", IEEE Trans on ASSP, vol. ASSP-27, No. 2, Apr. 1979.

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