AUTOMATIC RECOGNITION AND RECEIVING CIRCUIT OF MONO/STEREO AUDIO SIGNAL

PURPOSE: To automatically recognize a type and to operate an external source or a microphone input circuit by providing a connector type discrimination means and a switching means for changing a line in accordance with the type of a discriminated connector. CONSTITUTION: When a stereo connector is i...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KIN SEISHIYU, BOKU ROHEI, SAI EIKEI
Format:	Patent
Sprache:	eng
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS STEREOPHONIC SYSTEMS
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Beschreibung
Zusammenfassung:	PURPOSE: To automatically recognize a type and to operate an external source or a microphone input circuit by providing a connector type discrimination means and a switching means for changing a line in accordance with the type of a discriminated connector. CONSTITUTION: When a stereo connector is inserted into a jack 5, the left terminal part of the connector is connected to the left terminal 5L of the jack 5 and the right terminal part of the connector is connected to the right terminal 5R of the jack 5. The voltage of the terminal 5R becomes power voltage Vcc, Vcc voltage is applied to the control terminal of an analog switch 7 and it becomes an on state. On the other hand, the analog switch 7 becomes an open state. When a mono connector is inserted into the jack 5, the right terminal 5R is grounded. Then, OV is applied to the control terminal of the switch 7 and it becomes the off state. An input signal is not transmitted to a right amplifier part 10A. On the other hand, the switch 8 is turned on and it operates as that for mono.