| 摘要 |
PROBLEM TO BE SOLVED: To provide a remote control system for hot-water supplier, hot-water supplier controller with the same and intercom speech control method in which generation of noise sound is prevented by preventing a beat wave to be generated from being demodulated by controlling a voice amplifier circuit for intercom speech when the voice amplifier circuit for intercom speech is common with a voice amplifier circuit for a voice synthesizer circuit. SOLUTION: Each of remote controllers (kitchen remote controller 20, bathroom remote controller 30) constituting the remote control system for hot-water supplier is provided with: an FM demodulator 24b including a function for monitoring presence/absence of an audio signal carrier wave of an intercom; an operational amplifier 24c to be used for amplifying an audio signal; and an audio amplifier 24d for amplifying the audio signal. While no audio signal carrier wave is detected in the FM demodulator 24b, the operational amplifier 24c is not operated and an intercom speech line is turned into standby state. When an audio signal carrier wave is detected by the FM demodulator 24b, the operational amplifier 24c is operated and the intercom speech line is opened. COPYRIGHT: (C)2006,JPO&NCIPI
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