Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-07-29
1983-11-08
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455166, 455183, 455194, H04B 126
Patent
active
044146876
ABSTRACT:
A radio receiver which includes a phase locked loop including a voltage controlled oscillator which is connected to a frequency mixer, a two modulus prescaler having a feedback down counter and to a programmable divider. During the reception of a first broadcasting station, a control unit decreases the time constant of the phase locked loop for an extremely short time and sets frequency division ratios of the down counter and the programmable divider so as to receive a second broadcasting station. The two modulus prescaler frequency divides an output from the voltage controlled oscillator at a frequency division ratio 1/(P+1) until the count of the down counter is equal to zero. Then, the prescaler effects a frequency division at a frequency division ratio of 1/P. The phase locked loop is locked to the second station and its reception level is sensed. When the first station has a stored reception level higher than the now sensed level, the control unit is similarly operated so as to again receive the first station.
REFERENCES:
patent: 3882400 (1975-05-01), Hamada
patent: 4142158 (1979-02-01), Belisomi
patent: 4146839 (1979-03-01), Troy
patent: 4253194 (1981-02-01), Van Deursen
Developments in Phase Locked Loop Tuning Systems, Steve Yeung, Feb. 1979, New Electronics (Great Britain), vol. 12, No. 3, pp. 64-68.
Bookbinder Marc E.
Mitsubishi Denki & Kabushiki Kaisha
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