SIGNAL OUTPUT CIRCUIT, SIGNAL INPUT CIRCUIT AND SIGNAL INPUT/OUTPUT CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a signals output circuit, a signal input circuit and a signal input/output circuit capable of simplifying connection work. ;SOLUTION: With a switch 12 depressed, a controller 7 activates a mute circuit 3 so that an input signals from an input terminal 1 is not outputted from an output terminal 8, and the controller 7 selects a prescribed impedance for an output impedance of a signal generator 5, which produces a detection signal 4. The controller 7 allows a signals level detector 6 to measure an output level this time to measure an impedance of a load 11 connecting to the output terminal 8 thereby discriminating a connection state of a cable and allows a display section 14 to display the result.;COPYRIGHT: (C)1999,JPO