Pulse or digital communications – Transceivers
Patent
1992-11-06
1995-08-15
Chin, Stephen
Pulse or digital communications
Transceivers
375261, 375271, 375285, H04B 138, H04L 516
Patent
active
054426537
ABSTRACT:
A signal transmitting and receiving apparatus includes a transmitting circuit block which has a carrier signal supplying portion for supplying first and second carrier signals having the same frequency and a relative phase angle difference of substantially ninety degrees to be used for producing a transmissible digital phase-modulated signal. A receiving circuit block in which received digital data are obtained is based on a received digital phase-modulated signal, wherein the carrier signal supplying portion comprises a carrier signal generator for generating an additional carrier signal having a frequency twice as high as the frequency of each of the first and second carrier signals. A first flip-flop circuit produces the first carrier signal based on the additional carrier signal. A second flip-flop circuit produces the second carrier signal based on the additional carrier signal having been phase-inverted. A control unit causes the first and second flip-flop circuits to be operative when the signal transmitting operation is performed in the transmitting circuit block and to be inoperative when the signal receiving operation is performed in the receiving circuit block.
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Patent Abstracts Of Japan, vol. 10, No. 384, Dec. 23, 1986 "Radio Transmitter and Receiver".
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Chin Stephen
Le Amanda T.
Miller Jerry A.
Sony Corporation
Toto Peter C.
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