Radio receiver with system for maintaining optimum tuning

Details Radio receiver with system for maintaining optimum tuning Radio receiver with system for maintaining optimum tuning

1980-10-09

1982-08-10

Britton, Howard

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, H04B 116

Patent

active

043441874

ABSTRACT:
A radio receiver comprises a voltage-controlled oscillator acting as a local oscillator, a capacitor to supply a control voltage to the voltage-controlled oscillator, a phase locked loop incorporating the voltage-controlled oscillator and adapted for a preset selection of a broadcast station, a charge/discharge control circuit to charge or discharge the capacitor adapted for automatic or manual selection of a broadcast station, and an automatic frequency control circuit adapted for maintenance of a local oscillator frequency when the broadcast station is received. A control circuit is provided which couples the phase locked loop or charge/discharge control circuit to the capacitor in response to the selection of one of the station select modes and couples the automatic frequency control circuit to the capacitor in response to the reception of the broadcast station in a good receiving condition.

REFERENCES:
patent: 4240115 (1980-12-01), Kamiya
patent: 4264977 (1981-04-01), Deiss
patent: 4271530 (1981-06-01), van Deursen

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