Dial pulse measurement circuitry

Details Dial pulse measurement circuitry Dial pulse measurement circuitry

1982-07-16

1985-02-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

364574, 371 40, 371 22, 1791752R, H04M 322

Patent

active

045010030

ABSTRACT:
A method for analysis of rotary dial pulses focuses on transitions between pulse levels and differentiates true level changes from noise using a procedure employing two sample counters. One counter registers the number of consecutive samples at either the high or low levels and, once a predetermined number of consecutive samples are detected, a corresponding high or low level is declared. However, since noise may influence the detection, the total number of samples, from the first indication of a level change until the declaration of a state, is maintained in a second counter. A false transition reinitializes both counters, while level changes yielding less than the predetermined number only reinitialize the first counter.

REFERENCES:
patent: 4071708 (1978-01-01), Kaplan et al.
patent: 4309721 (1982-01-01), Christopher
patent: 4326105 (1982-04-01), Vaughan et al.
patent: 4336593 (1982-06-01), Takase

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