| 摘要 |
<p>A technique for modulating an amplitude shift keying (ASK)-modulated signal of which the modulation ratio is small is provided. A modulation ratio enhancement circuit 21 increases the modulation ratio of a current signal which is ASK-modulated with signal data. A branch unit 22, an average value detection unit 23, a comparator 24 and a buffer 25 constitute a demodulation unit so that the signal data is demodulated from a current signal of which the modulation ratio is increased by the modulation ratio enhancement circuit 21.</p> |
