Automatic sweeping digital tuning circuit
专利汇可以提供Automatic sweeping digital tuning circuit专利检索，专利查询，专利分析的服务。并且PURPOSE:To catch broadcasting electromagnetic waves surely, even with time delay for D/A conversion without lowering the speed of automatic sweep by helping the operation of an AFC circuit, through shifting the tuning frequency to a low frequency side compulsively. CONSTITUTION:A signal starting automatic sweep from a switching means 1 is received at an automatic sweep controlling circuit 2 and a pulse signal is applied from the circuit 2 to an up-down counter 3. After a digital output counted at the counter 3 is converted into a DC voltage at a D/A converter 4, it is applied to a varactor diode of an electronic tuner to sweep the tuning frequency of the tuner 5 to high frequencies. An automatic frequency fine adjusting circuit 6 is operated, and when the tuning frequency is shifted to high frequencies to the digital output of the counter 3, a count-down means 7 is actuated. The tuning frequency is compulsively shifted to lower frequencies by helping the operation of the circuit 6, allowing to catch broadcasting electromagnetic waves without suppressing the speed of automatic sweep.，下面是Automatic sweeping digital tuning circuit专利的具体信息内容。
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