1981-03-02
1983-07-05
Hickey, R. J.
179 1GB, H04H 500
Patent
active
043920160
ABSTRACT:
In an AM stereo radio receiver a filter is coupled to the IF amplifier and is tuned to the IF carrier frequency. The filter will ring at the IF and, if desired, can be incorporated into an oscillator circuit. The resulting signal acts as a reinserted carrier that will persist over those intervals during which the carrier would ordinarily be absent due to amplitude overmodulation. In effect the oscillatory signal sets the minimum value to which the carrier can be driven and will act to prevent the noise bursts that ordinarily accompany excessive modulation. Such overmodulation can result from inadvertence at the transmitter or from multipath reception.
REFERENCES:
patent: 3732375 (1973-05-01), Kuribayashi
patent: 4249039 (1981-02-01), Fisher et al.
patent: 4340782 (1982-07-01), Weigand et al.
Hickey R. J.
National Semiconductor Corporation
Schulte Neil B.
Winters Paul J.
Woodward Gail W.
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