Tuners – Tuner unit with electromagnetic operator – Predetermined center frequency selector
Patent
1976-01-26
1977-12-06
Griffin, Robert L.
Tuners
Tuner unit with electromagnetic operator
Predetermined center frequency selector
325468, 334 15, H04B 106
Patent
active
040619826
ABSTRACT:
A channel selection apparatus having a tuner including a voltage-dependent reactance element such as a varactor diode, to which one of a plurality of channel selection voltages having different magnitudes for each of the channels is applied to select a desired channel. A plurality of channel selection voltages for selecting a plurality of channels are digitalized and previously stored in a memory block at addresses corresponding to the channels. During the channel selection operation, the digital voltage signal for the channel desired to be selected is read out of the memory block and D-A converted to produce an analog channel selection voltage, which is then applied to the tuner to select the desired channel. The memory block further stores bits to indicate whether the channels are to be selected or not to be selected but skipped to select the next channel, at each of the addresses corresponding to the channels. Thus, only the required channels can be sequentially selected. No mechanical means such as variable resistors and switches are used to store the channel selection voltages and to control the skipping so that a fully electronic, highly reliable apparatus is provided.
REFERENCES:
patent: 3845394 (1974-10-01), Hamada
patent: 3940702 (1976-02-01), Yoshimura et al.
patent: 3968440 (1976-07-01), Ehni
patent: 3968444 (1976-07-01), Tenny
patent: 3990027 (1976-11-01), Kawashima
Griffin Robert L.
Matsushita Electric - Industrial Co., Ltd.
Ng Jin F.
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