Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-04-07
1999-10-05
Le, Amanda T.
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375340, 375349, 375345, 348726, 348735, 329308, H03D 300
Patent
active
059635975
ABSTRACT:
A data transmission apparatus applicable to transmission of data by the use of a cable of a television camera system or the like and capable of ensuring simplified exact demodulation of data transmitted through quadrature modulation. The apparatus comprises a demodulator for outputting detection signals of the quadrature-modulated signal based on reference signals whose phases are each different by a predetermined value from an I-axis reference signal and a Q-axis reference signal in the quadrature modulation; a signal level corrector for correcting the signal levels of the detection signals; and a signal converter for converting the output signals of the signal level corrector to detection signals based on the I-axis and Q-axis reference signals. An equalizer circuit is further included in the apparatus for adaptively equalizing the output signals of the signal converter or the output signals of the signal level corrector. The quadrature-modulated signal is inputted via a coaxial cable, and the above predetermined value of the phase difference is an angle of 45 degrees.
REFERENCES:
patent: 5386239 (1995-01-01), Wang et al.
patent: 5596605 (1997-01-01), Kiyanagi et al.
patent: 5787126 (1998-07-01), Itoh et al.
Patent Abstracts of Japan, vol. 017, No. 570 (E-1448), Oct. 15, 1993 & JP 05 167469 A (Fujitsu Ten Ltd), Jul. 2, 1993.
Frommer William S.
Le Amanda T.
Smid Dennis M.
Sony Corporation
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