Weiss etal subscription television system
Abstract
Abstract A SUBSCRIPTION TELEVISION SYSTEM PROVIDES SECURITY BY REPLACING HORIZONTAL BLANKING AND SYNCHRONIZING PULSES WITH A SIGNAL HAVING A GREY LEVEL AMPLITUDE. A RECONSTITUTING SIGNAL IS GENERATED HAVING THE FREQUENCY OF HORIZONTAL SYNCHRONIZING PULSES, AND IS TRANSMITTED ON A SEPARATE CARRIER. PROGRAM AUDIO AND NONSENCE AUDIO ARE RANDOMLY ALTERNATELY TRANSMITTED OVER TWO AUDIO CHANNELS. CONTROL TONE SIGNALS ARE TRANSMITTED WHICH ARE INDICATIVE OF PROGRAM PRICE AND AUDIO SIGNAL SWITCHING INTERVALS. THE RECEIVER INCLUDES AN ATTACHMENT WHICH MAY INCLUDE A COIN BOX, SELECTOR SWITCHES FOR ESTABLISHING A DECODER PATTERN, AND A CYCLIC COUNTER WHICH ADVANCES IN STEP WITH THE TRANSMITTED CONTROL SIGNALS. LOGIC CIRCUITRY DETERMINES WHETHER PROPER CONTROL SETTINGS HAVE BEEN MADE AT THE RECEIVER. WITH PROPER SETTINGS AND PAYMENT OF THE PROPER AMOUNT OF MONEY, THE ATTACHMENT APPLIES THE RECEIVED RECONSTITUTING SIGNAL TO A RECTANGULAR PULSE GENERATOR TO DERIVE PULSES FOR INCREASING THE GAIN OF AN RF AMPLIFIER TO WHICH THE COMPOSITE VIDEO IS APPLIED, PROVIDING A NORMAL COMPOSITE SIGNAL TO THE RECEIVER.
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