Electrical audio signal processing systems and devices – Switching
Patent
1996-12-27
1999-11-30
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Switching
381 74, H02B 100
Patent
active
059956330
ABSTRACT:
A system and method for multiplexing control signals over data signal conductors comprises an audio source for generating audio signals, a speaker device for monitoring the audio signals, a first high-pass filter for filtering the audio signals, a signal cable over which the audio signals are transmitted, a second high-pass filter for again filtering the audio signals, and headphones for monitoring the audio signals. The system and method further comprises a current source for generating a control signal whenever the headphones are connected and for transmitting the control signals over the signal cable, and a detector device for receiving the control signals and responsively using them to mute the speaker device.
REFERENCES:
patent: 4868815 (1989-09-01), Iwamura
Cappels Richard D.
Farrar Douglas M.
Hsieh Bobby T.
Mori Takashi
Apple Computer Inc.
Harvey Minsun Oh
Koerner Gregory J.
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