Subscriber validation system

Details Subscriber validation system Subscriber validation system

1986-01-21

1986-12-02

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

178 70R, 178 2208, 34082534, 455 7, 379188, G08B 700

Patent

active

046268456

ABSTRACT:
A system provides for the validation of users of a trunked radio system. The system includes a controller and at least one microcomputer-controlled repeater module for user identification and validation. Each repeater module includes a tracking filter for removing unwanted noise from the two-tone signal sequentially transmitted by the user's radio as well as a digital signal processor utilizing a novel filter algorithm to quickly and reliably identify and validate user group tones. If identified as a valid user, the repeater module allows the call to pass. If the identity and validity, i.e., a paying customer, of the user are not validated by the repeater module, the repeater is shut down and the user is unable to communicate, and only hears alert tones from his speaker. A microcomputer in the repeater module performs a period measurement of the received two-tone sequence over a fixed interval, generates a histogram representing the period spread of the tone versus time over that fixed interval, calculates the mean of this histogram which represents the average period measured in accordance with the novel algorithm, and converts this average period into a tone number which is used to access a user validation table. Comparison of this tone number with the contents of the validation table results in either the shut down of the repeater in the case of an invalid user or the transmission of the received information to the appropriate receiver by the repeater. The present invention thus provides for the rapid and reliable identification and validation of system users and the denial of system access where appropriate.

REFERENCES:
patent: 3939417 (1976-02-01), Camalte et al.
patent: 3973087 (1976-08-01), Fong
patent: 4471352 (1984-09-01), Soulliard et al.
Brochure entitled "Subscriber Validation System", by Epic Systems, Inc., 1982.
Brochure entitled "FSK Demodulator/Tone Decoder", dated Oct. 1976.
Brochure entitled "2732A 32K (4K.times.8) UV Erasable PROM", dated Aug. 1981, by Intel Corporation.
Brochure entitled "1024.times.8-Bit Static RAM for MCS-85", by Intel Corporation, 1980.
Brochure entitled "8031/8051/8751 Single-Component 8-Bit Microcomputer", by Intel Corporation, 1980.

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