Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-01-08
1976-11-02
Segal, Robert
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77D, G01R 2302
Patent
active
039900061
ABSTRACT:
Known tone detectors are adversely affected by various signaling tone distorting sources, including noise as well as talk-off due to tone-like speech, e.g., due to averaging of speech frequencies over a detection interval. As a result, improper tone detection often occurs. This problem is mitigated by dividing a detection interval into a plurality of detection sub-intervals which are then concatenated for tone detection. Detection of the desired tone in at least a predetermined number of concatenated sub-intervals is interpreted as the presence of a valid tone. Conversely, absence of detection of the desired tone in at least a second predetermined number of concatenated sub-intervals is interpreted as the absence of a valid tone.
REFERENCES:
patent: 3083266 (1963-03-01), Mathews et al.
patent: 3566263 (1971-02-01), Meers
patent: 3696293 (1972-10-01), Hoffmann
patent: 3760269 (1973-09-01), Beeman
patent: 3790720 (1974-02-01), Schartmann
Bell Telephone Laboratories Incorporated
Roddy Richard J.
Segal Robert
Tokar Michael J.
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