| 摘要 |
A personal transmitter for receiving and wirelessly transmitting an audio signal of a microphone includes a case, and a limiting unit disposed in the case. The limiting unit includes a primary circuit for receiving the audio signal of the microphone and adjusting an amplitude of the audio signal. The primary circuit has a variable resistance unit and a forward amplifier coupled together. The limiting unit includes a feedback circuit coupled to the primary circuit for receiving an output of the primary circuit and for feedback control that reduces a gain of the primary circuit when the amplitude of the audio signal exceeds a predetermined input threshold value. The personal transmitter also includes an amplifying unit disposed in the case and coupled to the limiting unit for receiving and amplifying an output of the limiting unit. The personal transmitter further includes a transmitter unit disposed in the case and coupled to the amplifying unit for receiving and wirelessly transmitting an output of the amplifying unit.
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