Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-06-25
1987-08-18
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 36, 358905, 455295, H04N 521
Patent
active
046880968
ABSTRACT:
A television receiver which includes an automatic deghosting system synchronously demodulates IF television signals to generate baseband signals representing the in-phase and quadrature phase modulation components of the IF signals. A signal representing the phase difference between the carrier of the signal as broadcast and the carrier of the received signal, which may include ghosts, is generated from the in-phase and quadrature signals. This signal is applied to circuitry which develops signals proportional to the sine and cosine of the phase angle separating the broadcast carrier phase and the received carrier phase. The demodulated in-phase and quadrature phase baseband signals are multiplied by the sine and cosine signals in a complex multiplier to correct distortion resulting from the synchronous demodulation using the carrier of the received signal.
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patent: 4285006 (1981-08-01), Kurahashi et al.
patent: 4374400 (1983-02-01), Holmes
patent: 4497067 (1985-01-01), Namiki
patent: 4584652 (1986-04-01), Sturza et al.
Thedick, H., "Adaptive Multipath Equalization for TV Broadcasting", IEEE Trans. on Consumer Electronics, May 1977, pp. 175-181.
Campbell, III Edward R.
Lewis, Jr. Henry G.
Chin Tommy P.
Nigon K. N.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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