Method and apparatus for reducing false ringback detection

Details Method and apparatus for reducing false ringback detection Method and apparatus for reducing false ringback detection

1998-05-04

2000-11-28

Woo, Stella

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379386, H04M 1100

Patent

active

061545376

ABSTRACT:
In a communication device, a decoded audio signal is evaluated by a detection function (112). Two portions of the decoded audio signal spectrum are evaluated, a ringback band (206), and the remaining band(s). The signal strength in the ringback band is measured against a preselected ringback energy threshold level and the non-ringback signal strength is measured against a voice energy threshold level. Only if the ringback energy is above the ringback energy threshold level and the non-ringback band energy is below the voice energy threshold level will a ringback filter be applied to the audio signal.

REFERENCES:
patent: 4689760 (1987-08-01), Lee et al.
patent: 5321745 (1994-06-01), Drory et al.
patent: 5450484 (1995-09-01), Hamilton
patent: 5563942 (1996-10-01), Tulai

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