Title: Ringing signal detector

Abstract: A ringing signal detector, which comprises a series diode clipper automatically biased by an input signal, a DC converter for converting the output of the series diode clipper to a DC level, a DC level detector for detecting the converted DC level to detect whether the input signal is a ringing signal or a dial pulse signal, thereby generating an output only when the input signal is the ringing signal.

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Inventors: Saneyoshi, Norio (Tokyo, JP)

Application Number: 876414
Filing Date: 1978-02-09
Publication_date: 1980-01-15
Assignee: Iwasaki Tsushinki Kabushiki Kaisha (JP)
Primary Class(es): 379/373.01 379/93.09
Other Classes:
US Patent Ref:

3723656	Mar, 1973	Curtis et al.	179/2.
3783193	Jan, 1974	Lee	179/84.
4081617	Mar, 1978	Clark	179/84.

Other Refs:
Primary Examiner: Konick, Bernard
Assistant Examiner: Popek, Joseph A.
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.