Noise blanking circuit for AM stero

Details Noise blanking circuit for AM stero Noise blanking circuit for AM stero

1991-12-17

1993-11-09

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, 455223, H04H 500, H04B 100

Patent

active

052610047

ABSTRACT:
An AM stereo input signal is processed by an envelope detector, an in-phase detector and a quadrature phase detector to yield outputs which may carry short noise impulses. Each output is low pass filtered to derive an average signal level and each output is ratiometrically compared to the corresponding average to detect a tic or modulation substantially above the average. In response to a tic a hold circuit generates a flag for a period which depends on the quality of the input signal. A dual mode deemphasis and sample/hold circuit normally filters the audio signal in each channel and is effective for the duration of the flag to hold the existing signal in the circuit to blank out the noise impulse.

REFERENCES:
patent: 4498195 (1985-02-01), Ooi et al.
patent: 4510624 (1985-04-01), Thompson et al.
patent: 4637066 (1987-01-01), Kennedy et al.
patent: 4680793 (1987-07-01), Sugai et al.
patent: 5014316 (1991-05-01), Marrah et al.

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