H - Electricity – 04 – B
Patent
H - Electricity
04
B
365/7
H04B 1/16 (2006.01) H03J 3/18 (2006.01) H03J 5/02 (2006.01) H04N 5/44 (2006.01)
Patent
CA 1061485
ABSTRACT OF THE DISCLOSURE 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 volt- ages 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.
245077
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