| 摘要 |
<p>PURPOSE:To attain voice detection not susceptible to the surrounding effect by comparing an output and a reference signal and judging the voice detection based on the result of comparison. CONSTITUTION:A voice signal subject to DC processing is inputted to a processing 18 together with a reference signal from a reference signal generating circuit 17. The comparator 18 compare the voice signal subject to DC processing is compared with a reference signal. As the result of comparison, when the voice signal subject to DC processing is more than the level of the reference signal, the signal including the information is inputted to a transmission output control circuit 19., and the power amplifier 13 is in normal operation by the control of the transmission output control circuit 19. Thus, the modulated voice signal is amplified by the power amplifier 13 and the signal is sent from an antenna 3 at a normal transmission output through a multicoupler 4. Thus, the level of the reference signal is set automatically and erroneous voice detection is prevented.</p> |
