Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-05-29
1980-09-30
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
334 86, 3581921, H04B 116, G01R 2310
Patent
active
042259720
ABSTRACT:
In a station signal frequency indicating system for a superheterodyne radio receiver, a station-signal frequency received by the receiver is evaluated on the basis of the oscillating frequency of a local oscillator in the receiver, the evaluation being compensated for a difference between the tuning frequency of the receiver and the station-signal frequency received. This evaluation is performed by, for instance, counting a signal generated at the local oscillator by a counter, and the compensation of evaluation is accomplished by, for example, varying a preset number for the counter in accordance with the dc-voltage level of the output of a demodulator in the receiver. Such system is capable of indicating a correct station-signal frequency so long as the frequency difference is less than a predetermined value, even when the receiver is not tuned exactly to the station-signal frequency.
REFERENCES:
patent: 3851254 (1974-11-01), Merrell et al.
patent: 3885218 (1975-05-01), Pfab
patent: 3938048 (1976-02-01), Elliott
patent: 4024477 (1977-05-01), Yamaguchi et al.
patent: 4065727 (1977-12-01), Johnson, Sr.
Bookbinder Marc E.
Nippon Gakki Seizo Kabushiki Kaisha
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