H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 1/515 (2006.01) H04M 1/82 (2006.01) H04M 3/02 (2006.01) H04M 3/428 (2006.01) H04M 3/48 (2006.01)
Patent
CA 2392671
A method and apparatus are described for using a series of signals that create an illusion of a continuous ascending or descending series of pitches as call waiting or call progress or process progress signals. In a preferred embodiment, a condition appropriate for representation by a call waiting or call progress or process progress signal is detected and, in response thereto, a series of signals is generated that creates an illusion of a continuous ascending or descending series of pitches. Preferably, the series of signals is Shepard's tones and the tones are generated by generating a plurality of tones, or partials, at octave intervals, amplitude filtering the partials to produce an amplitude envelope that peaks near the centermost partial or partials, and shifting the partials upwards (or downwards) through the octave in steps that are a fraction of an octave and preferably are a semitone. Illustrative apparatus for practicing the invention comprises a detector for detecting a condition suitable for representation by a call waiting or call progress or process progress signal and a signal generator for generating Shepard's tones. Preferably, the signal generator is a digital signal processor.
Begeja Lee
West Melanie
At&t Corp.
Kirby Eades Gale Baker
LandOfFree
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