Title: Selective signal receiver for use in telecommunication systems

Abstract: A selective digital signal receiver is disclosed in which the time distances between zero crossings of the input voltages are measured with a counter which is controlled at a clock frequency higher than the signal frequency. Each measurement covers a predetermined number of cycles. The greater the number of cycles chosen, the less the bandwidth must be widened for the zero-crossing shifts caused by noise.

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Inventors: Ball, Herbert (Stuttgart, DT)
Ohl, Wolf (Korntal, DT)

Application Number: 494287
Filing Date: 1974-08-02
Publication_date: 1976-01-27
Assignee: International Standard Electric Corporation (New York, NY)
Primary Class(es): 379/282
Other Classes:
US Patent Ref:

3537001	Oct, 1970	Friend	324/78.
3760269	Sep, 1973	Beeman	324/78.
3790720	Feb, 1974	Schartmann	179/84.

Other Refs:
Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Popek, Joseph
Attorney: Raden; J. B., Warner; D. P.