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:
Apr. 04, 1978
Filed:
Apr. 14, 1977
Marc Chomet, East Northport, NY (US);
Teleglobe Pay-TV System, Inc., Rego Park, NY (US);
Abstract
The computer at the central office is connected to the automatic answering system either with or without ringing the subscriber's telephone. Tones sent by the computer to the subscriber system are filtered and compared to a reference signal and a connect signal is furnished when the comparator outputs indicate that the tones signifying the particular billing system have been received. The connect signal energizes a relay which connects the billing system to the telephone line. A holding circuit for the relay is also energized. A first time delay circuit furnishes a signal to start data transmission from the billing system to the computer a short time after receipt of the connect signal. A billing system furnishes an 'access complete' signal deenergizing the holding circuit when billing data transmission is complete. To prevent voice signals from activating the comparators, an untuned differential amplifier has an input connected to the telephone line and furnishes a variable reference signal to the tone comparators, the output of the differential amplifier being less than the output of the filters when the correct tones are received and exceeding the output of the filters upon receipt of voice signals.