Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-07-10
1984-02-28
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 36, 358 35, 358 27, 328155, 333 18, 333 28R, 333165, 333166, H04N 544
Patent
active
044344384
ABSTRACT:
A low cost automatic equalizer is provided for reducing the amplitude and phase distortion produced by close-in echos. The color subcarrier burst, or some other portion of the video signal having predetermined amplitude and phase characteristic prior to transmission, is gated into detection circuitry. A regenerated color subcarrier, phase shifted to be in phase with the subcarrier burst, is used to detect the in-phase and quadrature components of the subcarrier burst, which are indicative of amplitude and phase distortion. The signals indicative of amplitude and phase distortion are applied to a three tap delay line equalizer, where the amplitude and polarity of the first and third tapped signals are controlled in unison to reduce amplitude distortion, and where the amplitude of the first and third tapped signals is controlled in unison, but the polarity of the first and third tapped signals is controlled oppositely to reduce phase distortion.
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Masinick Michael A.
Matsushita Electric - Industrial Co., Ltd.
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