Noise suppression apparatus for FM receiver

Details Noise suppression apparatus for FM receiver Noise suppression apparatus for FM receiver

1990-06-26

1991-07-30

Ng, Jin F.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 10, 381 11, 381 13, 381 93, 455222, 455223, H04B 1500

Patent

active

050365436

ABSTRACT:
A noise component is extracted either from FM-detected output or from the so-called signal meter in the intermediate frequency amplifier. The noise component is amplified and rectified to provide a d-c signal indicative of the noise level. The rectified noise is then shaped to produce a control signal having a predetermined level and a width. The control signal is supplied to the gate circuit to control the opening and closing of the gate through which the FM detected output passes. The gate is closed during a period when the pulse noise is superimposed on the FM detected output, and is opened during a period when the pulse noise is not superimposed to the FM detected output. In the mean time, the rectified d-c signal is smoothed out to be used as a control signal for controlling the stereo separation, the attenuation of high frequency component of the MPX-demodulated audio outputs, and the overall signal level of the audio outputs.

REFERENCES:
patent: 4416024 (1983-11-01), Ugari et al.
patent: 4419541 (1983-12-01), Kishi et al.
patent: 4480335 (1984-10-01), Kishi
patent: 4899389 (1990-02-01), Amazawa

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