H - Electricity – 03 – J
Patent
H - Electricity
03
J
365/5
H03J 7/20 (2006.01) H03J 7/06 (2006.01) H04B 1/26 (2006.01)
Patent
CA 1181878
ABSTRACT OF THE DISCLOSURE In a channel selection system using a PPL frequency synthesizing method in which the local oscil- lation frequency of a tuner is frequency-divided and compared with the frequency and the phase of a reference oscillator thereby to control the tuning voltage of a tuner, a channel selection system disclosed by this invention comprises a controller, a variable frequency divider the frequency division ratio of which is controlled by the above controller, an AFC circuit connected to this tuner, a first comparator having a first threshold voltage for detecting an H level of the inverted S character output of the AFC circuit, a second comparator having a second threshold voltage for detecting an L level of the inverted S character output, and a delay circuit connected to the output of at least one of the first and second comparators and delaying the rising edge of the comparison output
408593
Gowling Lafleur Henderson Llp
Hitachi Ltd.
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