Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1985-10-11
1988-08-16
Salce, Patrick R.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
379351, 370 81, G01L 500
Patent
active
047649666
ABSTRACT:
This invention enables voice energy to be distinguished from energy due to other sources such as telephone call progress signals. A portion of the audio spectrum is divided into a high and into a low frequency band and the energy content of these bands is examined. The audio energy of a signal is passed through a set of filters and compared. A frequency boundary crossing of an input signal subsequent to filtering is used to signify the receipt of a voice signal. By operating in this manner, voice, whose predominant frequency switches in a random fashion from being greater than to less than a cutoff frequency, can be distinguished from other signals either below or above the cutoff frequencies of the filters. The detection of voice energy is not begun until a predetermined threshold of energy has been received for a specified period of time. This specified period of time need not be continuous after a ringback signal is received. Subsequent to the receipt of a ringback signal, the voice detection mechanism will proceed as long as the total time above the threshold exceeds the specified time.
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IBM TDB, vol. 24, No. 1B, pp. 803-804, Jun. 1981, "Detection of Telephone Line Control Signals" to T. M. Campbell.
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Einkauf Mark A.
West Lynn P.
International Business Machines - Corporation
Julian H. St.
Salce Patrick R.
Todd Voeltz Emanuel
Villella, Jr. J. F.
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