| 摘要 |
PURPOSE:To improve the rise property of the modulation degree by controlling the modulation degree via the voltage comparator for the transceiver, and thus to increase the dynamic range. CONSTITUTION:Voltage comprator 10, which compares the modulation output voltage with the reference voltage and then generates the control signal according the level relationship between the both volage, is provided to feedback circuit 8 passing from the output side to the input side in modulation signal amplifier circuit 5, along with transistor Tr which is controlled by the control signal and supresses the modulation input voltage. Then the output voltage of mike 1 is controlled in accordance with the output of Tr. |
