Method of transmitting an audio signal

Details Method of transmitting an audio signal Method of transmitting an audio signal

1988-02-03

1990-07-17

Harkcom, Gary V.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 35, 381 37, G10L 302, G10L 918, H04B 166

Patent

active

049426079

ABSTRACT:
A method of digital transmission of an audio signal, in which in order to save transmission and/or memory capacity, the digital signal is converted, before transmission, into signals representing the short-term spectrum of time sections of the digital signal and portions of this signal are processed on the basis of psycho-acoustic laws, with portions of this signal lying below given thresholds left unconsidered, with at least one first threshold being defined below which only amplitude values outside of psycho-acoustically differentiable frequency ranges are left unconsidered.

REFERENCES:
patent: 3875341 (1975-04-01), Gassmann
patent: 3894190 (1975-07-01), Gassmann
patent: 4388491 (1983-06-01), Ohta et al.
patent: 4747143 (1988-05-01), Kroeger et al.
patent: 4759071 (1988-07-01), Heide
Zwicker, E., "Psychoakustik", pub. by Springer-Verlag Berlin Heidelberg, 1982, pp. 22-67.
Almeida et al., "Variable-Frequency Synthesis: An Improved Harmonic Coding Scheme", ICASSP 84, Mar. 19-21, 1984, pp. 1-4.
Un et al., "The Residual-Excited Linear Prediction Vocoder with Transmission Rate Below 9.6 Kbits/s", IEEE Trans. on Communications, COM 23, 1975, pp. 1466-1473.

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