Electrical audio signal processing systems and devices – Headphone circuits
Reexamination Certificate
2003-03-21
2008-12-02
Mei, Xu (Department: 2615)
Electrical audio signal processing systems and devices
Headphone circuits
C381S309000, C381S001000
Reexamination Certificate
active
07460676
ABSTRACT:
This invention may provide a headphone driving circuit needless of coupling condenser even if the power supply supplies a single output voltage. The headphone driving circuit comprises (1) a first amplifier to amplify a first composite signal generated by subtracting a second channel audio signal from a first channel audio signal, then driving one end of a first voice coil of a stereo-headphone, (2) a second amplifier to amplify a second composite signal generated by subtracting the first channel audio signal from the second channel audio signal, then driving one end of a second voice coil of the stereo-headphone, (3) a third amplifier to amplify a third composite signal generated by adding the first channel audio signal and the second channel audio signal for driving the other end of the first and the second voice coil of the stereo-headphone.
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Mei Xu
Oki Electric Industry Co. Ltd.
Volentine & Whitt PLLC
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