Amplitude-modulated signal receiver having a variable Q circuit

Details Amplitude-modulated signal receiver having a variable Q circuit Amplitude-modulated signal receiver having a variable Q circuit

1982-02-16

1984-06-19

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455266, H04B 116, H04H 500

Patent

active

044556748

ABSTRACT:
In an AM radio signal receiver, the value of Q of the input tuning circuit is varied in accordance with information indicative of the magnitude of the received signal. This information may be derived from the intermediate frequency (IF) signal processing stage of a superheterodyne receiver. In such a case, the IF signal is applied to a narrow-band filter having a pass band which is narrower than that of the IF signal processing stage. The amplitude of the output signal from the narrow-band filter is then detected to control a variable resistance element which is connected in parallel with winding of an input tuning coil so that the value of Q of the input tuning circuit is lowered when receiving a broadcasting signal having relatively high intensity. The invention may be adapted to an AM stereo receiver. In this case, the variable resistance element is controlled by both a signal indicative of the amplitude of the received signal and a signal indicating that the received signal is a stereo signal.

REFERENCES:
patent: 2947859 (1960-08-01), MacDonald
patent: 3872387 (1975-03-01), Banach
patent: 3931576 (1976-01-01), Csicsatka et al.
patent: 4352208 (1982-09-01), Schroeder
patent: 4370520 (1983-01-01), Malchow

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