Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1990-04-24
1991-06-11
Schreyer, Stafford D.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379386, 379457, H04M 1100, H04M 126
Patent
active
050239066
ABSTRACT:
A call progress monitor and algorithm for placing a phone call over the phone lines. The algorithm is hierarchically arranged having three major routines or portions: tone detection, signal recognition and situation recognition. Based upon the definitions stored in a memory and the commands, the call progress monitor algorithm is applied to the telephone audio data. 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. The tone detection portion of the algorithm measures the power at each of a predetermined number of frequencies of interest. The signal recognition portion of the algorithm detects the presence of a particular signal. A signal is a particular tone or set of tones that are uniquely present (while all other tones are absent). Furthermore, a signal has qualifying requirements of signal to noise ratio (SNR), twist, and noise variance, that must be met to define a particular signal. The situation recognition portion of the algorithm determines that a certain sequence or pattern of signals has occurred with a particular timing or cadence. When a match to a particular desired condition specified in a situation definition is made, a success is reported in the Recognize Command Termination Report. Otherwise, a failure is reported, together with the condition detected which elicited the failure response.
REFERENCES:
patent: 4405833 (1983-09-01), Cave et al.
patent: 4439639 (1984-03-01), Munter
patent: 4686699 (1987-08-01), Wilkie
patent: 4924493 (1990-05-01), Dang et al.
Signetics Linear Products, "NE5900 Call Progress Decoder Product Specification", May 8, 1986, pp. 6-3 to 6-9.
Schreyer Stafford D.
The Telephone Connection
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