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Detecting make-break clicks on a telephone line

  • US 5,428,662 A
  • Filed: 03/01/1993
  • Issued: 06/27/1995
  • Est. Priority Date: 03/01/1993
  • Status: Expired due to Term
First Claim
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1. A click detector for detecting a click in a telephone signal, the click detector comprising:

  • amplitude sampler means, responsive to the telephone signal, for obtaining measures of magnitude of amplitude of the telephone signal at various points in time;

    controller means, responsive to the measures of magnitude from the amplitude sampler means;

    (i) (a) for storing the measures of magnitude in a storage means and (b) for sending a magnitude-adaptor signal to a magnitude adaptor for determining a start-of-click adaptive amplitude measure and an end-of-click adaptive amplitude measure and for storing the adaptive amplitude measures in the storage means;

    (ii) for determining a measure of time during a reporting interval and for storing the measure of time in the storage means;

    the controller means further comprises means, responsive to click-begin information stored in the storage means, for sending a magnitude-jump signal to a magnitude jump detector if the click-begin information indicates a click start has not been detected and, if the click-begin information indicates the click start has been detected, (a) for updating a measure of click length in time and for storing the measure of click length in the storage means and (b) for sending a silence-detect signal to a silence detector;

    the controller means still further comprises means, responsive to the measure of time during the reporting interval and to click-detected information stored in the storage means, for generating a click-detection signal which indicates whether a click was detected when the measure of time equals a reporting time interval length;

    the magnitude adapter, responsive to the magnitude-adaptor signal, the measures of magnitude, and the start-of-click and the end-of-click adaptive amplitude measures, for updating and storing the adaptive amplitude measures in the storage means;

    the magnitude jump detector, responsive to the magnitude-jump signal, measures of magnitude, and the start-of-click adaptive amplitude measure stored in the storage means, for detecting a click start by identifying an increase and a rate of increase in measure of magnitude of amplitude and for updating and storing the click-begin information in the storage means;

    the silence detector, responsive to the silence-detect signal, the measures of magnitude, and the end-of-click adaptive amplitude measure stored in the storage means, for;

    (a) detecting silence, (b) updating a measure of length of the silence in time and for storing the measure of the length of the silence in the storage means, and (c) sending an end-of-click-detect signal to an end-of-click detector; and

    the end-of-click detector, responsive to the end-of-click-detect signal, the measure of click length, and the measure of length of the silence stored in the storage means, for detecting a click end click and for updating and storing the click-detected information in the storage means.

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