| 摘要 |
Voice signal processor. The processor consists of a sending amplifier, a receiving amplifier, an automatic gain controller, a compressor, a volume control, an amplifier of the multi- frequency marking signal, a mute, a polariser, a parallel regulator and a stabilised-voltage generator, which all constitute a Wheatstone bridge structure, in which the sending and receiving amplifiers are situated respectively between the diagonals of the bridge, while a set of impedances consisting of the impedance ZL, the impedance ZB and the resistors R1 and R2 take up the four sides of the abovementioned structure.
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