Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Patent
1995-03-08
1997-02-18
Chin, Wellington
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
375326, 455324, 455266, H04J 100, H04B 106, H04B 126
Patent
active
056047460
ABSTRACT:
A digital data receiver having a converter for frequency conversion of the input high frequency digital orthogonal modulation signal in a fixed intermediate frequency band, a demodulator for orthogonally demodulating an intermediate frequency signal output from the conversion signal based on a fixed frequency, and a controller for matching a frequency of the oscillation signal to a central frequency of the intermediate frequency band based on a frequency control signal generated to perform an orthogonal detection process by the demodulator. The central frequency of the oscillation signal is offset to correspond to a carrier frequency of the digital data orthogonal modulation signal in the state that a plurality of digital orthogonal modulation signal is frequency division multiplexed in the intermediate frequency band.
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Chin Wellington
Kabushiki Kaisha Toshiba
Loomis Paul
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