| 摘要 |
The numerous input monitoring amplifier has an input controller to control various kinds of sound generation for a facsimile. The amplifier includes the input controller for receiving output signals from a protocol signal generator, a voice message generator and a ring generator to adjust as an uniform input voltage of an amplifier so as not to influence a circuit impedance; and an analog multiplexer for selecting one signal between two output signals from the input controller and an output signal from an alarm sound generator to supply them to a volume controller of the amplifier.
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