| 摘要 |
<p>PURPOSE:To reduce cost required for connection members for connecting a voice hearing apparatus with an equipment main body even while allowing the voice hearing apparatus such as an earphone, etc., to have a function controlling the equipment main body. CONSTITUTION:When the control switch 14 in a remote control part 11 is off, a transistor 13 is turned on and a DC voltage whose voltage is divided by a resistor 27 and a resistor 15 is superimposed on a voice signal. At this time, the DC voltage superimposed on the voice signal becomes lower than a power supply voltage because the equantitative relation of resistance values is the resistance of the resistor 16> the resistance of a resistor 27> the resistance of the resistor 15. The DC voltage superimposed on the voice signal is extracted from the voice signal by a second low-pass-filter 52. On the other hand, when the control switch 14 is on, the transistor 13 is turned off and a DC voltage whose voltage is divided by the resistor 27 and the resistor 16 is superimposed on the voice signal. At this time, the DC voltage superimposed on the voice signal becomes higher than of the time when the control switch 14 is off by the equantitative relation of resistance values. Thus, the DC voltage superimposed on the voice signal is changed by the on/off of the control switch 14 and this change can be used as a control signal.</p> |
