Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent
1984-10-19
1987-02-24
Dwyer, James L.
Telephonic communications
Centralized switching system
With generating of call associated substation signal
379352, H04M 1902, H04Q 300
Patent
active
046458816
ABSTRACT:
The method includes generating a binary signal (S4A to S4D) which is time modulated. To do this, an alternating signal (S1) is compared with a known cyclical signal (S5) and a threshold signal. There is measured the durations between the transitions of the modulated signal by means of a high speed clock and by means of counting in the positive and negative directions of the clock pulses for one or more periods of the signal under examination. If, after counting, a residual value is found, one generates a binary signal representing the transition.
REFERENCES:
patent: 3312787 (1967-04-01), Jorgensen
patent: 3730999 (1973-05-01), Shaffer
patent: 3941939 (1976-03-01), Holmes
patent: 4447675 (1984-05-01), Arntsen
Leduc Yves
LeToumelin Loic
Tollon Franck
Dwyer James L.
Honeycutt Gary C.
Merrett N. Rhys
Sharp Melvin
Texas Instruments Incorporated
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