Telephonic enquiry system

Details Telephonic enquiry system Telephonic enquiry system

1976-04-05

1977-03-22

Claffy, Kathleen H.

179 16EA, 179 16EC, H04M 1110

Patent

active

040138380

ABSTRACT:
This system allows remote enquiry of the status of a condition over the telephone transmission lines by sending a code number with the telephone and specifically includes means for both decoding multifrequency telephone signals and detecting the number of dial pulses. With respect to the dial pulses, it qualifies each pulse as valid or invalid by comparing its amplitude with that of a preceding, known valid pulse. The dial telephone switch break time requirements are used to reject leading noises and to locate the leading valid pulse of a given train. Once the valid leading pulse is identified, the system uses a sequential timing control network to identify the time intervals during which valid input pulses are expected and thereby rejects noises occurring between valid pulses. In one particular application of the system, the presence or absence of mail in a specified mailbox of a group of mailboxes may be interrogated by a subscriber to the system remotely over the telephone lines and a verbal response is automatically generated over the telephone lines to the subscriber to tell him whether or not there is mail present in his mailbox.

REFERENCES:
patent: 3879583 (1975-04-01), Rooks
patent: 3927264 (1975-12-01), Fish
patent: 3935392 (1976-01-01), Smith
patent: 3935994 (1976-02-01), Darvishian

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