| 摘要 |
PURPOSE: To provide a simple and inexpensive processor by providing a channel selection section to a 2nd frequency conversion section converting an amplified intermediate frequency signal into a TV signal of a prescribed channel so as to change an output channel. CONSTITUTION: A band pass filter 10 passes a TV signal of a predetermined channel only among signals received by an input terminal 11. The selected TV signal is converted into an intermediate frequency signal by a 1st frequency conversion section 1 and amplified to a prescribed level by an intermediate frequency amplifier section 2. The TV signal amplified by the amplifier 2 is frequency-converted into a TV signal of a desired channel by a 2nd frequency conversion section 3. A channel selection section 4 is connected to a local oscillator 15 of the conversion section 3 and a voltage applied to two terminals 16, 17 is varied to vary the frequency. The signal outputted from the conversion section 3 is selected by a filter 18 and outputted to an output terminal 19.
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