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Title:
ACOUSTIC SIGNAL INPUT AND OUTPUT UNIT, SWITCHING METHOD OF INPUT AND OUTPUT CIRCUIT
Document Type and Number:
Japanese Patent JP2004328419
Kind Code:
A
Abstract:

To make it possible to use a combination jack while minimizing a burden on the port of a microcomputer.

The connection of a stereo headphone plug and a monaural microphone plug is made possible using a combination jack and a circuit is switched in accordance with a connection plug. A control means (controller 1) detects the connection of the plug to the combination jack from a potential state at a detection port P2. A discrimination signal is then applied and a voltage state between a second signal terminal T3 and a ground terminal is detected at the detection port P2. Consequently, the detection of plug connection and the detection of the type of a connected plug (whether the stereo headphone plug or the monaural microphone plug) are performed only at one detection port P2.


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Inventors:
Nishinosono, Yuji
Application Number:
JP2003000120977
Publication Date:
November 18, 2004
Filing Date:
April 25, 2003
Export Citation:
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Assignee:
SONY CORP
International Classes:
H04R1/10; H04R1/06; H04R5/04; (IPC1-7): H04R5/04; H04R1/06; H04R1/10
Attorney, Agent or Firm:
脇 篤夫
鈴木 伸夫