Techniques for detecting a condition of response on a telephone

Details Techniques for detecting a condition of response on a telephone Techniques for detecting a condition of response on a telephone

1979-12-07

1982-10-26

Popek, Joseph A.

179 602, 179 81R, 179 90B, H04M 322

Patent

active

043563481

ABSTRACT:
Methods and apparatus for detecting a condition of response on a telephone line are disclosed in accordance with the teachings of the present invention wherein time intervals between the zero crosspoints of an input signal are ascertained and the most prevalent interval determined. The most prevalent interval determined is compared with succeeding time intervals of the input signal and the results of such comparison are employed in classifying the input signal as periodic or not. The nature of the periodic or non-periodic signals are further analyzed to ascertain the condition on the line and an absence of signal for a selected period following a detection of periodic or non-periodic input signals may then be relied upon to indicate that an announce operation may be initiated.

REFERENCES:
patent: 3927259 (1975-12-01), Brown
patent: 4160125 (1979-07-01), Bower et al.

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