Pulse or digital communications – Repeaters
Reexamination Certificate
2005-12-06
2005-12-06
Chin, Stephen (Department: 2634)
Pulse or digital communications
Repeaters
C375S376000, C375S216000, C375S240000
Reexamination Certificate
active
06973121
ABSTRACT:
A repeater system for receiving a modulated input signal and for transmitting a modulated output signal comprising a clock oscillator for providing a repeater system clock, a demodulator for demodulating an input signal and a modulator for modulating the demodulated signal to obtain a modulated signal. The demodulator comprises a first mixer, a first controllable oscillator and a feedback circuit, the first controllable oscillator being controlled by a first control value such that the frequency of the demodulated signal approaches a desired value. The modulator comprises a second mixer and a second controllable oscillator, the second controllable oscillator being controlled by a second control value such that the modulated output signal has a predetermined output frequency. A controller derives the second control value.
REFERENCES:
patent: 4608699 (1986-08-01), Batlivala et al.
patent: 5010317 (1991-04-01), Kuznicki et al.
patent: 5107488 (1992-04-01), Schreder et al.
Bernhard Josef
Eberlein Ernst
Paul Christian
Von Der Gruen Thomas
Chin Stephen
Dougherty Clements & Hofer
Fraunhofer-Gesellschaft zur Förderung der angewandten Forsc
Ware Cicely
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