Automatic system for providing telephone number information serv

Details Automatic system for providing telephone number information serv Automatic system for providing telephone number information serv

1975-12-22

1977-04-26

Chapnick, Melvin B.

Communications: electrical

Digital comparator systems

G06F 710, G06F 1502, G06F 1540

Patent

active

040204731

ABSTRACT:
In an automatic telephone information retrieval system, each subscriber entry is encoded according to primary name, secondary name, primary address, secondary address, generic occupation and specific occupation. The entire contents of a local telephone directory may be electronically stored at memory addresses based upon the above encoding. Statistical methods are used to ensure a workable distribution of subscriber entries over the available memory addresses. The information is retrieved from memory by successively dividing the memory into "divided down" portions. Division points, which are boundaries between neighboring divisions, are designated in a form directly convertible into address coordinates of a random access core storage to speed information retrieval. Electronic calculating and comparing circuits automatically search the memory as a function of the division points, and also provide rapid and automatic address range computations. The system is geared to operate with incomplete subscriber entry data, and in many instances corrects operator errors.

REFERENCES:
patent: 3242470 (1966-03-01), Hagelbarger et al.
patent: 3345612 (1967-10-01), Goldman
patent: 3448436 (1969-06-01), Machol, Jr.
patent: 3715730 (1973-02-01), Smith et al.

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