Analog-to-digital converter as for an adaptive television deghos

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358 23, 358160, 455314, H04N 540

Patent

active

046865705

ABSTRACT:
A digital television signal deghosting system includes an IIR filter responsive to the in-phase and quadrature-phase components of modulated television signals for cancelling ghost signals irrespective of their phase. A double-conversion tuner develops modulated composite video signals having a 3f.sub.c carrier frequency. An analog-to-digital converter responsive to a two-phase 3f.sub.c clock signal develops digital samples which alternately represent the baseband in-phase and quadrature-phase components of the modulated video signals. These samples are separated to develop digital signals representing the in-phase and quadrature-phase components of the modulated television signals.

REFERENCES:
patent: 3760094 (1973-09-01), Skerlos
patent: 4500912 (1985-02-01), Bolger
patent: 4502078 (1985-02-01), Steckler et al.
patent: 4542408 (1985-09-01), Lewis, Jr.
Thedick, H. Adaptive Multipath Equalization for T.V. Broadcasting, IEEE Trans. on Cons. Elect. 5/77, pp. 175-181.
Orfanidis, S. J. Optimum Signal Processing, An Introduction, pp. 278-289 (1985).

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