Earphone jack for eliminating power noise in mobile...

Details Earphone jack for eliminating power noise in mobile... Earphone jack for eliminating power noise in mobile...

2005-07-19

2010-06-29

Yun, Eugene (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S569100, C455S149000, C381S111000

Reexamination Certificate

active

07747295

ABSTRACT:
An earphone jack for a mobile communication terminal and a driving method thereof, wherein the earphone jack includes a first speaker terminal for providing a positive (+) differential call voice signal when a call voice signal is output, a second speaker terminal for providing a negative (−) differential call voice signal when the call voice signal is output, and a switchable ground terminal for maintaining a ground on state when a media sound source is output, and becoming a ground off state when the call voice signal is output. The method includes the steps of determining whether an audio signal to be currently output is a media sound source signal (that is, a sound source media data signal), or a call voice signal (that is, a wireless call voice signal), and when the media sound source signal is output, maintaining a ground on state and outputting the media sound source signal in stereo, and when the call voice signal is output, maintaining a ground off state and outputting a differential signal.

REFERENCES:
patent: 5596638 (1997-01-01), Paterson et al.
patent: 6944484 (2005-09-01), Yasuda
patent: 7035597 (2006-04-01), Maden
patent: WO 91/02408 (1991-02-01), None

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