Pulse or digital communications – Bandwidth reduction or expansion
Reexamination Certificate
2005-12-27
2005-12-27
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Bandwidth reduction or expansion
C375S295000, C375S316000, C375S345000, C455S043000
Reexamination Certificate
active
06980593
ABSTRACT:
The wireless transmission-reception system of the subject invention includes a transmitter and a receiver. The transmitter includes a compressor for compressing a signal to be transmitted and a pre-emphasis circuit for emphasizing an output signal of the compressor. The receiver includes a demodulator, an expander circuit for expanding an output signal of the demodulator, a first de-emphasis circuit connected to the demodulator in parallel with the expander for de-emphasizing the output signal of the demodulator, and a second de-emphasis circuit connected to an output signal of the expander circuit for de-emphasizing a signal expanded by the expander circuit. The expander circuit having a variable gain amplifier includes a rectifier. An output signal from the first de-emphasis circuit is sent to the rectifier and an output signal of the rectifier performs to control a gain of the variable gain amplifier.
REFERENCES:
patent: 2220260 (1940-11-01), Heinrich
patent: 4215431 (1980-07-01), Nady
patent: 5091952 (1992-02-01), Williamson et al.
patent: 5226178 (1993-07-01), Eastmond et al.
patent: 6038430 (2000-03-01), Thomson et al.
Bocure Tesfaldet
Ejaz Naheed
Kabushiki Kaisha Audio-Technica
Welsh & Katz Ltd.
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