Pulse or digital communications – Repeaters – Testing
Patent
1993-06-17
1995-06-20
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375340, 375324, 329310, H03D 318, H04L 2706
Patent
active
054266696
ABSTRACT:
A quadrature demodulator includes a device for generating first and second reference signals having a quadrature relation with each other. A first demodulating device serves to compare phases of the first reference signal and an input modulated signal to demodulate the input modulated signal into a first binary baseband signal. A second demodulating device serves to compare phases of the second reference signal and the input modulated signal to demodulate the input modulated signal into a second binary baseband signal having a quadrature relation with the first baseband signal. A first counting device operates to count pulses of a clock signal in response to the first baseband signal. A second counting device operates to count pulses of the clock signal in response to the second baseband signal. An address signal is generated in response to the output signals of the first and second counting devices. Data representative of an absolute phase of the input modulated signal is generated in response to the address signal.
REFERENCES:
patent: 4246654 (1981-01-01), Malm
patent: 5005186 (1991-04-01), Aono et al.
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5239273 (1993-08-01), Hedstrom et al.
Kunieda Yoshinori
Matsubara Naoki
Ohnishi Hiroshi
Takahashi Ken'ichi
Yamamoto Yuuri
Chin Stephen
Matsushita Electric - Industrial Co., Ltd.
Phan Hai H.
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