Intelligent teletext decoder

Details Intelligent teletext decoder Intelligent teletext decoder

H - Electricity

03

H

328/0.2

H03H 17/00 (2006.01) H04N 7/035 (2006.01)

Patent

CA 1154102

INTELLIGENT TELETEXT DECODER ABSTRACT OF THE DISCLOSURE 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 cou- pled 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 weightedwith 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 trans- versal filter.

367717

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