Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-03-27
1988-12-20
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455163, 455172, 455164, H04B 1132, H04B 1116
Patent
active
047929880
ABSTRACT:
A radio receiving circuit provided with a search tuning mechanism. A broadcasting radiowave signal is received during a search tuning operation, and a shift amount of frequency produced in frequency of an intermediate frequency amplifier output is experimentally determined within an inertia self-travelling time interval search tuning mechanism due to the mechanical inertia thereof from the moment at which a drive force applied to the search tuning mechanism is interrupted to the time when the mechanism temporarily positively stops its function. The drive force applied to the search tuning mechanism is interrupted at a frequency deviated by the shift amount in advance from a center frequency of a pass band width of the intermediate frequency amplifier circuit, whereby after the mechanism has self-travelled due to its own mechanical inertia force and when tuned to the center frequency of the received radiowave signal, the search tuning operation is suspended.
REFERENCES:
patent: 2885546 (1959-05-01), Taylor et al.
patent: 3553379 (1971-01-01), Boomgaard
patent: 3715495 (1973-02-01), Takezaki et al.
patent: 3968442 (1976-07-01), Garskamp
patent: 4389732 (1983-06-01), Sasahara et al.
Matsuda Toshiyuki
Ohashi Tamaki
Adams Bruce L.
Griffin Robert L.
Nihon Technical Kabushiki Kaisha
Smith Ralph E.
Wilks Van C.
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