Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1994-01-05
1995-11-28
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455222, 455296, 455310, H04B 126
Patent
active
054716608
ABSTRACT:
A highspeed scanning type radio receiver is disclosed which prevents an erroneous interruption of a scanning operation caused by high frequency noises produced from a clock oscillator and a local oscillator circuit employed therein. The highspeed scanning type radio receiver includes a highspeed clock oscillator, a lowspeed clock oscillator, and a clock switching circuit for switching these highspeed clock oscillator and lowspeed clock oscillator to be connected to a CPU. Normally, a searching operation is carried out by supplying the highspeed clock to the microcomputer. When a reception signal is detected in a certain channel, the highspeed clock is changed into the lowspeed clock to be supplied to the microcomputer, whereby a reception signal is again detected. When no reception signal is detectable, the microcomputer recognizes that the detection of the reception signal under operation at the highspeed clock is caused by high frequency noises, and commences a searching operation of the next channel.
REFERENCES:
patent: 3619788 (1971-11-01), Giles, Jr. et al.
patent: 4264976 (1981-04-01), Yamashita
Eisenzopf Reinhard J.
Le Thanh
Uniden Corporation
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