Elastic surface wave channel selector
专利汇可以提供Elastic surface wave channel selector专利检索，专利查询，专利分析的服务。并且PURPOSE:To enable an automatic channel selector of a FM tuner, etc., making use of an elastic surface element to make invariably-accurate channel selections with the circuit constitution simplified, by determining the counting start time of a counter by the frequency of a local oscillator. CONSTITUTION:This system is equipped with electronic tuner 1 provided with a voltage control type local ocillator, and clock pulse generator 12, counters 13 and 14, comparator 15, FF 18, gate circuit 21, integrating circuit 19, and tuning converter circuit 20 constituting a tuning voltage sweep circuit which sweeps the oscillation frequency of the local oscillator. In addition, elastic surface wave comb line filter 3 supplied with the output of the local oscillator and detector 4 detecting the output of filter 3 are both provided, and the output of this detector 4 is counted by counter 7 to make channel selections. Then, memory circuit 17 is equipped which is stored with an output voltage from the sweep circuit when the oscillation frequency of the local oscillator reaches a fixed value, and during channel selection operation, outputs of circuit 17 and the sweep circuit are compared, so that the counting of counter 7 will be started from when the frequency of the local oscillator reaches the fixed value.，下面是Elastic surface wave channel selector专利的具体信息内容。
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