Circuit and method of 3-wired interface for headphones

Details Circuit and method of 3-wired interface for headphones Circuit and method of 3-wired interface for headphones

2005-09-27

2005-09-27

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Headphone circuits

C381S111000

Reexamination Certificate

active

06950527

ABSTRACT:
A circuit for coding input signals to an audio output device. The circuit comprises a first coder generating voice signals on a first and second channel, and a second coder receiving the voice signals of the first and second channel, and outputting a first, second and reference voltage signal to the audio output device, wherein the reference voltage signal switches between a first and second voltage level, and the voice signals of the first and second channel are represented by differential signals of the first and reference voltage signal, and the second and the reference voltage signal, respectively.

REFERENCES:
patent: 5175768 (1992-12-01), Daniels

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