Adaptive method and apparatus for detecting a stutter dial tone

Details Adaptive method and apparatus for detecting a stutter dial tone Adaptive method and apparatus for detecting a stutter dial tone

1997-12-22

2000-06-06

Isen, Forester W.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379372, 379350, H04M 300

Patent

active

060728698

ABSTRACT:
A method and apparatus for detecting a stutter dial tone SDT signal. The method includes the steps of, receiving a received signal from a subscriber loop, generating a signal envelope of the received signal, generating a threshold parameter value from the signal envelope, counting the number of threshold parameter crossings undertaken by the signal envelope and producing a signal indicating SDT signal has been received when number of threshold crossings exceeds a predefined value.

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patent: 4539646 (1985-09-01), Stein et al.
patent: 4539692 (1985-09-01), Munter
patent: 5327493 (1994-07-01), Richmond et al.
patent: 5483593 (1996-01-01), Gupta et al.
patent: 5521964 (1996-05-01), Schull et al.
patent: 5563942 (1996-10-01), Tulai

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