Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent
1992-06-24
1993-02-09
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Hearing aid
381 30, 381 45, G10L 500
Patent
active
051858002
ABSTRACT:
A device for compressing a digital audio signal, includes a device for allocating bits available for the transmission or storage of the signal, controlling means for the adaptive quantization of the signal, in order to enable a major reduction in the bit rate while at the same time preserving the quality of the starting signal to the maximum extent. The device includes means for allocating a specific number of bits for the expression of the coefficients of each frequency band of a transformed digital audio signal, as a function of a piece of auxiliary information corresponding to a description of the spectrum of the signal, said device being informed by means for the prior elimination of spectral components of said transformed signal as a function of a psychoauditive criterion.
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Johnston, J. D., Estimation of Perceptual Entropy Using Noise Masking Criteria, IEEE (CH2561), Sep. 1988, pp. 2524-2527.
Zwicker, E., Subdivision of the Audible Frequency Range into Critical Bands (Frequenzgruppen), J. Accoust. Soc. Am., vol. 33, No. 2, Feb. 61, p. 248.
Zwicker, E. and Terhardt, E., Analytical Expressions for Critical-Band Rate and Critical Bandwidth as a Function of Frequency, J. Acoust. Soc. Am., vol. 68, No. 5, Nov. 1980, pp. 1523-1525.
Centre National d'Etudes des Telecommunications
Kemeny Emanuel S.
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