Interface circuit for audio signal

Details Interface circuit for audio signal Interface circuit for audio signal

1992-07-21

1994-04-05

Sikes, William L.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307494, 328147, 328149, H03F 345

Patent

active

053008260

ABSTRACT:
An interface circuit for an audio signal includes a low-pass filter supplied with an audio signal with a DC component superposed thereon from a first circuit for extracting the DC component and a differential-input circuit. The differential-input circuit is supplied with the audio signal with the DC component superposed thereon from the first circuit and also supplied with the DC component extracted by the low-pass filter and the output of the differential-input circuit is supplied to a second circuit. In the differential-input circuit, the DC component superposed on the audio signal from the first circuit is canceled by the DC component from the low-pass filter so that only the audio signal is supplied to the second circuit. With the above described arrangement, terminal pins of an IC can be reduced in number.

REFERENCES:
patent: 3590811 (1971-07-01), Harris
patent: 4241455 (1981-02-01), Eibner
patent: 4405901 (1983-09-01), Taguchi et al.
patent: 4460821 (1989-07-01), Orban
patent: 4910753 (1990-03-01), Wakatsuki et al.
patent: 5172017 (1992-12-01), Schmidt

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