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Voice/voice band data discrimination apparatus

  • US 5,295,223 A
  • Filed: 05/28/1991
  • Issued: 03/15/1994
  • Est. Priority Date: 10/09/1990
  • Status: Expired due to Fees
First Claim
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1. A voice/voice band data discrimination apparatus for discriminating voice and/or voice band data transmitted over a telephone line in combination of an audible sound, a signaling used with a sine wave of a single frequency or sine waves of a plurality of frequencies, and voice band data used with a modulated wave, said apparatus comprising:

  • zero-cross comparing means having a predetermined width of a dead zone represented by preselected signal magnitude values above and below the zero signal level with respect to the voltage of an input signal to said zero-cross comparing means and for comparing the width of the dead zone and the amplitude of the input signal so as to count only how many times the input signal crosses the width of the dead zone, as the number of the zero crosses;

    zero-cross number counting means for counting the number of zero crosses in response to the output of said zero-cross comparing means;

    absolute-value voltage linear converting circuit means for converting absolute-value voltages from said input signal;

    absolute-value voltage sum counting means for counting the sum of absolute-value voltages of the input signal;

    encoding means for producing codes based on values counted by said zero-cross number counting means and said absolute-value voltage sum counting means in response to the outputs of said zero-class number counting means and said absolute-value voltage sum counting means;

    memory means for storing the output of said encoding means therein; and

    code discriminating means responsive to the output of said memory means for outputting a discrimination signal therefrom while observing the contents of the codes during a selected reference time period as set for measurement.

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