Electrical audio signal processing systems and devices – Headphone circuits
Patent
1998-01-22
1999-11-09
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Headphone circuits
381311, 455 90, H04R 110
Patent
active
059829044
ABSTRACT:
A wireless headset is provided, comprising: a microphone for receiving a first audio signal and for generating a corresponding microphone electrical signal; a portable receiver/transmitter electrically connected to the microphone for transmitting a first carrier frequency modulated according to the microphone's electrical signal; a remote receiver/transmitter for receiving and demodulating the modulated first carrier frequency to generate a first electrical signal corresponding to the microphone electrical signal, the remote receiver/transmitter also for transmitting a second carrier frequency modulated according to a second electrical signal; the portable receiver/transmitter also for receiving and demodulating the second modulated carrier frequency to generate a speaker electrical signal; and a speaker electrically connected to the portable receiver/transmitter for transforming the speaker's electrical signal into a second audio signal, one of the first and second carrier frequencies being above 900 Megahertz, the other of the first and second carrier frequencies being below 900 Megahertz.
REFERENCES:
patent: 4558178 (1985-12-01), Yasuda et al.
patent: 4661659 (1987-04-01), Nishimura
patent: 4815143 (1989-03-01), Derhaag et al.
patent: 5218641 (1993-06-01), Abe et al.
patent: 5428388 (1995-06-01), Von Bauer
patent: 5621913 (1997-04-01), Tuttle
patent: 5671158 (1997-09-01), Fournier et al.
Cullen Mark F.
Eghtesadi Khosrow
Harvey Minsun Oh
Voice Communication Interface Corp.
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