| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a tuning device which can suppress unnecessary power consumption if input of an input sound signal is quit and also carry on tuning operation without any troublesome operation only by inputting the input sound signal again. <P>SOLUTION: A monostable multivibrator 26 starts counting, and then outputs a Low-level signal to the base side of a transistor 19 when a Hi-level signal is not outputted from an OR circuit 25 again for a specified time (when input of the input sound signal is quit) to cut off power supply from a battery 17 to a main control circuit 11 (power-saving mode). Then when the input sound signal is inputted again and a sound signal detection part 22 detects the input sound signal, the monostable multivibrator 26 outputs a Hi-level signal to the base side of the transistor 19 to restart the power supply from the battery 17 to the main control circuit 11 (normal mode). <P>COPYRIGHT: (C)2004,JPO</p> |
