Circuit for automatically recognizing and receiving mono and ste

Details Circuit for automatically recognizing and receiving mono and ste Circuit for automatically recognizing and receiving mono and ste

1995-05-15

1997-08-05

Oh, Minsun

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 12, 381123, 381 28, H04H 500

Patent

active

056550251

ABSTRACT:
In a mono/stereo input circuit for use in an audio equipment, and more particularly in a circuit for automatically recognizing and receiving mono/stereo audio signals, although a mono connector is inserted into a stereo jack, such an insertion of the mono connector is automatically recognized and then a stereo circuit can operate as a form of a mono circuit. The circuit for automatically recognizing and receiving the mono/stereo audio signals utilizes a fact that one connection terminal of the jack is grounded or not according to a type of the connector such as a mono connector and a stereo connector which is inserted into the jack. Accordingly, a resistor used as a voltage generator generates a generation voltage according to such a connector recognition. Also, using a difference between the generated voltage, the analog switches are turned on or off, to obtain a mono or a stereo audio signal processing circuit according to a type of the inserted connector. Accordingly, the present invention has an effect that a type of the inserted connector can be automatically recognized, and an external source or a microphone input circuit can operate without having any inconveniences to change a selector switch each time when a user exchanges a stereo input signal with a mono input signal.

REFERENCES:
patent: 4433209 (1984-02-01), Kurosawa
patent: 5056148 (1991-10-01), Hayashi

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