| 摘要 |
The circuit has a demodulator for demodulating an incoming signal. A wave shaping circuit(3) produces a rectangular signal. A battery saver control periodically supplies power to the receiver under control of timing pulses. The battery saver circuit has a valid incoming signal detector which receives the output of the wave shaping circuit and detects the frequency of bits per second of the incoming signal. It produces a logic signal indicative of detection of a valid incoming signal. |
