Electronic noise-reducing system

Details Electronic noise-reducing system Electronic noise-reducing system

1985-01-03

1986-05-13

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 71, 381 92, H04R 2700

Patent

active

045891370

ABSTRACT:
A method and apparatus for reducing noise from a near-field noise source sent together with signals from a far-field source. The method uses an adaptive shaping filter and a summer, in conjunction with a directional reference sensor and a primary sensor which have at least a common sensing element therebetween. The directional reference sensor situated between the near-field noise source and the far-field signal source, rejects the broad-band signal but accepts the broad-band noise and feeds this noise into a reference channel of the adaptive filter. The primary sensor accepts both the far-field signal and near-field noise with equally sensitivity. The primary sensor feeds into the primary channel of the adaptive filter. The adaptive filter system subtracts the noise in the reference channel from the signal-plus-noise in the primary channel, thus producing an output having a greatly improved signal-to-noise ratio.

REFERENCES:
patent: 4025721 (1977-05-01), Graupe
patent: 4153815 (1979-05-01), Chaplin
patent: 4308425 (1981-12-01), Momose
patent: 4354059 (1982-10-01), Ishigaki
patent: 4417098 (1983-11-01), Chaplin
patent: 4420655 (1983-12-01), Suzuki
patent: 4489441 (1984-12-01), Chaplin
patent: 4536887 (1985-08-01), Kaneda

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