The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 19, 1978
Filed:
Apr. 11, 1977
Marc Chomet, East Northport, NY (US);
Teleglobe Pay-TV System, Inc., Rego Park, NY (US);
Abstract
The standard composite television signal is modulated onto an intermediate frequency carrier signal. The so-modulated signal is applied to the input of a first and second frequency converter for conversion respectively to a first or second UHF or VHF output frequency. The two converters are enabled alternately, each for a predetermined number of frames. The resultant signals are summed and transmitted to a receiver location. At the receiver location, the power is split along two channels. Two tuner-mixers, one in each channel, and tuned, respectively, to the first and second output frequency, respectively convert the incoming signal components having the first and second frequency to the same intermediate frequency. The two intermediate frequency signals are summed and converted to the proper frequency for reception on standard television receiver. A program code detector at the receiver counts the number of consecutive outputs from at least one of the tuner-mixers and enables the billing system if the correct number of counts for a given program is present or disables the tuner-mixers if the number is incorrect.