Importance

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Abstract

A comparator for comparing an AFC output an analog demodulation circuit with a predetermined reference voltage Vref, an OR gate to which two inputs including an output of the comparator and a channel select signal are input, and a switch for connecting a crystal oscillator of a digital demodulation circuit to the digital demodulation circuit when an output of the OR gate is 'H (or 1)' are provided. When an analog broadcast signal that should be received is not normally received, the crystal oscillator of the digital demodulation circuit is connected to the digital demodulation circuit to operate the digital demodulation circuit. Then, the channel select signal is supplied to a PLL circuit of a tuner front end via the digital demodulation circuit.

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First Claim