Telephone number coding device

Details Telephone number coding device Telephone number coding device

1983-01-31

1984-05-01

Pellinen, A. D.

179 84C, 179 84SS, H04M 121, H04M 1102

Patent

active

044463340

ABSTRACT:
A telephone number coding device for eliminating unwanted telephone calls by requiring that a caller dial a special number code, in addition to a regular telephone number, in order for a telephone connected to the device to "ring." The coding device contains a sound generator which simulates telephone ring signals to alert the device user of an incoming call only when a caller dials a special number code consisting of one or more digits. Since the code is revealed only to those the device user wishes to have call him, all unwanted calls are eliminated. Thumbwheel switches are provided on the device for the user to preselect a desired code, and allow instant code change at any time. The coding device includes dual detectors, allowing a caller to dial a required code using standard telephone dual tone multi-frequency (DTMF) tones, if a tone telephone is available, and allowing a caller to "dial" a required code by rapidly tapping on a telephone mouthpiece so that each series of taps equals each digit of the code, if a pushbutton or rotary telephone is available. The coding device automatically silences the ringer mechanism of a telephone connected to it, and also provides an accessory which silences the ringer mechanism of an extension telephone used with the device. Either a primary or extension telephone can be used to answer calls which are received by the coding device. All cooperating telephones function normally, except that the ringer mechanisms are silenced.

REFERENCES:
patent: 4405839 (1983-09-01), Groff

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