Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-06-13
1984-05-15
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358160, 358167, H04N 514, H04N 704
Patent
active
044491450
ABSTRACT:
An equalizer and decoder system compensating for multipath distortion in digital format signals sent by teletext, for example. The system loads demodulated data signals and a received reference signal into a charge coupled device clocked in real time by a clock circuit. Later, the reference pulse is clocked to a microprocessor which determines tap coefficients for a transversal filter to correct the multipath distortion in the reference signal. The data signals are then applied to a transversal filter weighted with the calculated tap weights. After filtering, signals are decoded by the microprocessor.
In another embodiment a charge coupled device with tapped stages is used at one time for receiving the data signals in real time, and at a later time for part of a transversal filter.
In a simplest embodiment, distortions are removed by the microprocessor itself, without any separate transversal filter.
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patent: 4044381 (1977-08-01), Shimano
patent: 4091418 (1978-05-01), Ciciora
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Chin Tommy P.
Zenith Radio Corporation
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