| 摘要 |
A voice communication instrument system for two-way voice communication is disclosed. The system includes a voice communication instrument having a microphone and a receiver transducer, and a transmit-receiver circuit system comprising a transmit conditioning circuit and a receiver conditioning circuit. The transmit conditioning circuit provides amplification and frequency response correction of microphone electrical voice signals. The receiver conditioning circuit provides linear compression limiting, amplification, and, if desired, frequency response correction to an incoming electrical voice signal prior to introduction to the receiver transducer. The receiver conditioning circuit is powered from the transmit circuit D.C. output voltage, at low voltage and low current. The receiver conditioning circuit has a transformerless input circuit, and further includes bias current control to the various circuit stages to eliminate the effects of supply voltage fluctuations.
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