Thick Film Technology For Pay TV Security; The T.E.S.T System (1976)
By B. Becht, T.E.S. T., Inc.
The TEST System for pay.TV security consists of adding a modulated rf signal to the pay. TV channel transmission. The frequency of the rf signal falls within the band of frequencies of the pay.TV channel. The TV receiver set is unable to reconstitute coherent picture or sound, while this added signal is present in the transmission. Regular reception is restored for subscribers by removing the interfering rf signal at the TV receiver set. Thick film technology facilitates the realization of stringent requirements of stability for the components of the System.
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