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Method for monitoring telephone call progress
| Details |
Inventors: Novas, Robert G.; Spitzer, Andy;
Assignee: The Telephone Connection (Rockville, MD)
Primary Examiner: Chin; Stephen
Assistant Examiner: Loomis; Paul
Attorney, Agent or Firm: Keck, Mahin & Cate
A call progress monitor and algorithm for placing a telephone call over the telephone lines. The algorithm is hierarchically arranged having three major routines or portions: tone detection, signal recognition and situation recognition. The tone detection portion of the algorithm measures the power at each of a predetermined number of frequencies of interest. In accordance with one improvement, the data is sampled at a fraction of the rate at which it is supplied, for example, on a T1 channel. The signal recognition portion of the algorithm detects the presence of a particular signal and this stage of the algorithm has been modified to more precisely detect voice. Specifically, power within a voice filter band is compared with power at other predetermined frequencies and a decision is made based on this information. Furthermore, another improved aspect is that data for an entire Epoch is accumulated and stored in a buffer prior to processing as a group. The situation recognition portion of the algorithm determines that a certain sequence or pattern of signals has occurred with a particular timing or cadence. |
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DETAILED DESCRIPTION It is a primary object of the present invention to provide a system and method for detecting and discriminating audio signals and particularly signals indicative of the progress of a telephone call made by an automated device, such as a computer.
It is another object of the present invention to provide a system and method for monitoring the progress of outgoing telephone calls placed by an automated device, by detecting the power level and cadence of audible call progress signals.
It is a further object of the present invention to employ a down-sampling technique whereby every other sample of data supplied is processed so as to enhance processing speed on machines which run the algorithm.
It is still another object of the present invention to employ first-in, first-out (FIFO) buffering of each sample of audio data as it becomes available to accumulate sufficient data for processing as a group.
Such data buffering prevents potential "run over" in processing data in real-time as a constant new stream of data becomes available.
The call progress monitor method according to the present invention is embodied as a computer algorithm run on a digital signal processor (DSP) or high powered personal computer.
The algorithm is hierarchically arranged having three major routines or portions: tone detection, signal recognition and situation recognition.
For detecting signals on a telephone line, the machine running the call progress monitor algorithm is interfaced with telephone audio data and also receives as input certain commands and preset definitions.
Based upon the definitions stored in a memory and the commands, the call progress monitor algorithm is applied to the telephone audio data.
Specifically, the call progress monitor algorithm is controlled by a host computer which sends a Recognize Situation Command and expects to receive some time later, a Recognize Command Termination Report.
Thus the call progress monitor is commanded to recognize a situation, applies the call progress monitor algorithm to the telephone audio data and replies with a Recognize Command Termination Report based upon the results obtained by the algorithm
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