Dual tone multifrequency and dial pulse receiver

Details Dual tone multifrequency and dial pulse receiver Dual tone multifrequency and dial pulse receiver

1982-05-13

1984-07-17

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

3701103, H04J 312, H04Q 354

Patent

active

044608063

ABSTRACT:
A dual tone multifrequency and dial pulse receiver that receives 8000 digital data words per second, each of the data words including eight PCM bits representing the analog signal transmitted from a subscriber set and also including a line status bit indicating the DC status of the line. The receiver includes a time-shared processor which processes the PCM bits of 4000 words per second to detect tone-pairs and which also processes the line status bit of 4000 words per second to detect valid dial pulse sequences. The time-shared processor stores one of a first plurality of code words in a register when a tone-pair is detected and stores one of a second plurality of code words in the register when a valid dial pulse sequence is detected. Advantageously, the receiver can detect either dual tone multifrequency or dial pulse signaling from a subscriber even though the type of signaling to be used by the subscriber is not known a priori.

REFERENCES:
patent: 3315039 (1967-04-01), Gebhardt et al.
patent: 3941938 (1976-03-01), Gauthier
patent: 4256926 (1981-03-01), Pitroda et al.
patent: 4280217 (1981-07-01), Hafer et al.
patent: 4317962 (1982-03-01), Cox et al.

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