Test equipment for a teletex television receiver

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

G - Physics

01

R

324/58.1

G01R 31/28 (2006.01) H04N 7/035 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1167106

TEST EQUIPMENT FOR A TELETEX TELEVISION RECEIVER ABSTRACT OF THE DISCLOSURE 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 transmits pseudo-random data packets having a first frequency of binary elements, with two double-intervaled binary elements at two predetermined instants t1 and t2 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)/n, 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.

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