Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1983-10-24
1985-07-02
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455168, H03J 718
Patent
active
045272816
ABSTRACT:
The auto-scan changeover system for a two-band radio receiver employing first and second PLL frequency synthesizers comprises: first detecting circuit responsive to a tuning frequency scanning signal from the first or second PLL frequency synthesizer for detecting completion of a scanning operation of a broadcasting band by first or second auto-scanning circuit; first switching circuit responsive to a detection signal from the first detecting circuit for switching a power supply between first and second broadcasting band reception circuits so as to render one of the reception circuits operative for reception; second detecting circuit for detecting that the first switching circuit switched the power supply to the first or second broadcasting band reception circuit; and second switch responsive to a detection signal from the second detecting circuit for actuating first or second broadcasting band auto-scanning circuit.
REFERENCES:
patent: 3942121 (1976-03-01), Bell et al.
patent: 4222121 (1980-09-01), Matsumoto et al.
patent: 4361906 (1982-11-01), Sakamoto
Imagawa Toshiyuki
Ohara Kazuya
Clarion Co. Ltd.
Ng Jin F.
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