Call tracing and identification system

Details Call tracing and identification system Call tracing and identification system

1975-09-05

1976-12-14

Brown, Thomas W.

179 55, H04M 157

Patent

active

039977323

ABSTRACT:
A call tracing and identification system for use with a public telephone network includes at least one interrogation and digital display circuit associated with a called-party telephone of the network, and an encoder circuit associated with a calling party telephone in the system. In response to an interrogation command initiated by a ringing signal or a line voltage change when the telephone is answered, the encoder circuit generates a series of coded signals and applies the same to the telephone for identifying the calling party by area code and telephone number. The identification signals are received by the display circuit of the called telephone where they are rapidly decoded, stored and displayed in digital form. The number of cycles of transmitted sine wave frequency is used for identification, and an output of a sequentially addressed memory to a display is gated in synchronism with the addressing at a rate sufficient to be visually imperceptible.

REFERENCES:
patent: 2045146 (1936-06-01), Jeandron et al.
patent: 2764633 (1956-09-01), Serrataco
patent: 2963553 (1960-12-01), White
patent: 3336445 (1967-08-01), Nakagawa
patent: 3674941 (1972-07-01), Guetta
patent: 3686440 (1972-08-01), Kroeger
patent: 3864522 (1975-02-01), DeKozan et al.

Affiliated with

Also associated with

Rating

Call tracing and identification system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Call tracing and identification system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Call tracing and identification system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1346034