Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-06-02
1980-05-27
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, H04B 116
Patent
active
042052718
ABSTRACT:
An electronic preset type tuning control device of a tuner using a varactor diode means for multi-band radio receiver is disclosed, which comprises a manually operable tuning pulse generator capable of generating a clock signal and an up or down pulse signal which may be controlled manually, an up/down counter responsive to the output of the pulse generator to produce a binary signal corresponding thereto, a random access read/write memory for storing the binary signal at addresses assigned by a pair of ganged band selector switches a channel selector switch and a preset switch, a digital-analog converter responsive to the binary signal to convert it into a d.c. signal which is fed to the varactor means to tune the tuner to a desired frequency and a control means responsive to the outputs of the preset switch, the band selector switch and the channel selector switch for reading out the data stored in the memory to cause the counter to transmit it to the digital-analog converter without chattering noise due to the operations of the switches.
REFERENCES:
patent: 3953801 (1976-04-01), Podowski
patent: 3961261 (1976-06-01), Pflasterer
patent: 3968440 (1976-07-01), Ehni
patent: 4041402 (1977-08-01), Mogi
patent: 4085372 (1978-04-01), Mogi et al.
Griffin Robert L.
Ng Jin F.
Pioneer Electronic Corporation
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