Apparatus and method for checking signals

Details Apparatus and method for checking signals Apparatus and method for checking signals

1997-05-08

1999-07-20

Le, N.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379 9335, 379142, 379215, 379354, 379386, H04M 100

Patent

active

059265418

ABSTRACT:
A method and apparatus to avoid wrong detection when detecting signals including CAS (Call Alert Signal) formed by specific frequencies in the audio range, wherein frequency components forming a specific signal are detected from an input signal, and it is judged whether any signal component other than that of specified frequency range is included or not in entered audio range signal by comparing the energy level of the entered audio range signal with the energy level of only the specified frequency components extracted from the input signal. If any signal component other than that of the specified frequency range is judged to be included as a result of the energy level comparison, the signal is judged not to be the CAS signal.

REFERENCES:
patent: 5519774 (1996-05-01), Battista et al.
patent: 5588052 (1996-12-01), Murata et al.

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