INTERFACE CIRCUIT FOR FFT FREQUENCY ANALYZER AND SOUND SENSOR POSITION CONTROL SYSTEM

摘要

An interface circuit for an FFT frequency analyzer and a sound sensor position control system are provided to reduce a manufacturing cost by simplifying a hardware structure for performing an interfacing operation. A signal amplifier unit is connected to an output signal terminal of an FFT frequency analyzer(4) between the FFT frequency analyzer and a sound sensor position control system. A comparison amplifier unit receives a reference signal according to an output signal and a resistance of the signal amplifier unit. A driving unit includes a transistor for driving a relay according to an output of the comparison amplifier unit. An operation completion signal transmission unit(10) is connected to a relay contact of the driving unit. An input terminal of a photo-coupler is connected to an output terminal of a PLC(3). An output terminal of the photo-coupler is connected to a microprocessor. An operation start and standby signal output unit(15) is connected to an output terminal of the microprocessor.