Method and system of background noise suppression in an audio ci

Details Method and system of background noise suppression in an audio ci Method and system of background noise suppression in an audio ci

1988-09-01

1989-09-19

Ng, Jin F.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381 57, 381 86, 381 94, 381103, 381106, H03G 300, H03G 320

Patent

active

048688819

ABSTRACT:
To improve the fidelity of reproduction of automobile radios during conditions of extraneous in the passenger compartment, noise signals are derived, for example from a microphone installed in the engine compartment of the vehicle. The audio program signals are conducted through a multichannel equalizer; the program audio signals and the noise signals are separated into a plurality of frequency bands, for example three bands, the envelope of which are demodulated and the derived demodulation signals are instantaneously compared to then control the transfer characteristics of the respective bands of the equalizer in accordance with the derived comparison between the respective bands of the noise and program signals. Preferably, amplitude, change of transfer amplitude and rate of change is controlled by weighting the comparison signals and the rate of change thereof in relation to the frequency bands and the extent of change of the signals.

REFERENCES:
patent: 4254303 (1981-03-01), Takizawa
patent: 4380824 (1983-04-01), Inoue
patent: 4430754 (1984-02-01), Ishigaki
patent: 4476571 (1984-10-01), Tokumo et al.
patent: 4553257 (1985-11-01), Mori et al.
patent: 4641344 (1987-02-01), Kasai et al.
patent: 4641361 (1987-02-01), Rosback
patent: 4688258 (1987-08-01), Kunugi et al.

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