| 摘要 |
PROBLEM TO BE SOLVED: To prevent the reduction of recording capacity of a recording medium caused by recording a noisy audio signal when radio is received on a place weak in electric field intensity. SOLUTION: An IF signal of amplitude according to the electric field intensity is supplied from an IF amplifier circuit 15 to an RF amplitude measuring means 25, and the amplitude of the IF signal is observed for a prescribed time in the RF amplitude measuring means 25. Then, when the average amplitude of the IF signal is smaller than a prescribed value, the audio signal recorded on the recording medium with a recording means 19 before then in erased substantially by rewriting a recording contents control table recorded on the recording medium.
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