AM Stereo receiver

Details AM Stereo receiver AM Stereo receiver

1981-05-26

1983-01-25

Hickey, R. J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455239, 455246, H04B 112, H04H 500

Patent

active

043705200

ABSTRACT:
An AM stereo receiver includes an AGC system with first and second AGC system characteristics. The first AGC system characteristic provides a relatively constant receiver output signal for increasing received signal strength, i.e., a hard AGC characteristic. The second AGC characteristic provides a somewhat increasing receiver output signal for increasing received signal strength, i.e., a soft AGC system characteristic. A tuning detector is used to detect when the receiver is being tuned. When the receiver is being tuned, the AGC system is conditioned to provide a relatively soft AGC characteristic, which facilitates accurate receiver tuning. When the receiver is not being tuned, the AGC system is conditioned to provide a relatively hard AGC characteristic, which facilitates accurate left and right stereo channel separation.

REFERENCES:
patent: 2144008 (1939-01-01), Barber
patent: 3076057 (1963-01-01), Baugh, Jr.
patent: 4121161 (1978-10-01), Ohsawa
patent: 4270223 (1981-05-01), Marston
Proposal entitled, "In the Matter of AM Stereophonic Broadcasting," Docket No. 21313, submitted to the Federal Communication Commission, pp. 30-32.

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