Test equipment for a teletex television receiver

Details Test equipment for a teletex television receiver Test equipment for a teletex television receiver

1980-11-12

1983-03-22

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328162, 370 13, 370 17, 375 10, 455 9, H04N 702, H04N 962

Patent

active

043778224

ABSTRACT:
This test equipment permits a testing of the demodulator of a teletex television receiver. It consists of a digital test signal generator, the output of which is connected to the HF input of the television, and a receiver, the input of which is connected to the video output of said receiver. The generator tramsmits pseudo-random data packets having a first frequency of binary elements, with two double-intervaled binary elements at two predetermined instants t.sub.1 and t.sub.2 for each packet. The receiver has a data regeneration circuit whose threshold varies line by line from a maximum value to a minimum value. The sampling clock of the receiver is at a second frequency lower than the first by the ratio (n-2)
, where n is equal to the integral ratio of the first frequency to the line frequency of the television. A suitable means insures resynchronization of the sampling clock at the middle of each line. A receiving circuit for the pseudo-random data detects the errors which are transmitted to the video input of the television.

REFERENCES:
patent: 3898564 (1975-08-01), Waldhauer
patent: 4097697 (1978-06-01), Harman
patent: 4204228 (1980-05-01), Mason
patent: 4246608 (1981-01-01), Baker
NHK Laboratories Note, No. 216, Sep. 1977, pp. 1-13.
Nachrichtentechnische Zeitschrift, vol. 30, No. 3, Mar. 1977, pp. 225-228.
IEEE Transactions on Consumer Electronics, vol. CE-25, No. 3, Jul. 1979, pp. 304-310.

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