Telephone dialing system with error indicating function

Details Telephone dialing system with error indicating function Telephone dialing system with error indicating function

1992-01-15

1994-08-16

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379354, H04M 127

Patent

active

053393570

ABSTRACT:
A telephone dialing system includes a memory unit for storing a dialed telephone number, a comparator for comparing first digit data of the dialed telephone number stored in the memory unit and second digit data of a telephone number presently being manually dialed and providing a first output when more than half of the digits of the first and second digit data coincide with each other while less than half of the digits of the first and second digit data do not coincide with each other so that the presently dialed number is an incorrectly dialed number and a second output when more than half of the digits of the first and second digit data do not coincide with each other so that the presently dialed number is a new number. An alarm unit issues an alarm in response to the first output. A speech output unit generates a speech output announcing the dialed telephone number stored in the memory unit. A confirmed dialed telephone number sending unit sends out the dialed telephone number announced by the speech output unit in response to a selection input generated by a user via manipulation of a specified special function key. A display unit provides a luminous or flickering display in response to the first output from the comparator unit. A comparative display distinguishably displays the coincidence part and the non-coincidence part of the first and second individual digit data.

REFERENCES:
patent: 4930155 (1990-05-01), Kurokawa
patent: 5136637 (1992-08-01), Rust et al.

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