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

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Saito, Kazuo
• Primary Examiner(s): MacDonald, Allen R.
• Assistant Examiner(s): HAFIZ, TARIQ R
• Application Number:
  US07/706,204
• Time in Patent Office: 1,022 Days
• Field of Search: 395/2, 381/61, 381/35, 381/36, 381/43, 381/46, 381/61, 84/603, 370/81
• US Class Current: 704/214
• CPC Class Codes: H04Q 1/46 comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Abstract

An apparatus for discriminating voice data so as to create statistical data and for discriminating voice/voice band data in digital speech interpolation and digital circuit multiplication equipment. A comparison is made between the dead zone width and the amplitude of the input signal so as to count only how many times the input signal crosses the width of each dead zone as the number of the zero crosses. Then, the sum of the absolute-value voltages of the input signal is determined and the encoding is performed based on the values corresponding to the sum thereof thus determined or the average and dispersion analysis of the values is carried out, thereby effecting the discrimination of the vowel and consonant of the voice, the tone signal and the frequency thereof, and the modulated wave. Further, the number of the crosses of the input signal to the threshold set in the form of plural steps is determined to the input signal transmitted over the telephone line. Then, the encoding is made based on the result of determination of the number of the crosses or the average and dispersion analysis of the values is performed.

Claims

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.

2. A voice/voice band data discrimination apparatus according to claim 1, further comprising a voiced sound detecting means for detecting a voiced sound from the sum of the absolute-value voltages of the input signal.

3. 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 signal 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 scouting the sum of absolute-value voltages of the input signal;

average/dispersion calculating means responsive to the outputs of said zero-cross number counting means and said absolute-value voltage sum counting means for calculating the average and the degree of dispersion of values obtained by counting the outputs thereof a selected number of times with respect to the input signal; and

average/dispersion value discriminating means responsive to the output of said average/dispersion calculating means for carrying out the average and dispersion analysis of counted values during a selected reference time period as set for measurement so as to output a discrimination signal therefrom.

4. A voice/voice band data discrimination apparatus according to claim 3, further comprising a voiced sound detecting means for detecting a voiced sound form the sum of the absolute-value voltages of the input signal.

5. A voice/voice band data discrimination apparatus for discriminating voice and/or voice band data transmitted over a telephone line in combination of a voice 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:

voltage detecting/comparing means responsive to an input signal for determining whether or not the input signal exceeds a plurality of preset thresholds;

a plurality of counters provided according to said plurality of preset thresholds respectively;

encoding means responsive to the outputs of said plurality of counters for creating codes based on values of the outputs of said respective counters;

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

code identifying 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 time period as set for measurement.

6. A voice/voice band data discrimination apparatus according to claim 5, further comprising a voiced sound detecting means for detecting a voiced sound from the sum of the absolute-value voltages of the input signal.

7. A voice/voice band data discrimination apparatus for discriminating voice and/or voice band data transmitted over a telephone line in combination of a voice 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:

voltage detecting/comparing means responsive to an input signal for determining whether or not the input signal exceeds a plurality of preset signal thresholds set in said voltage detecting/comparing means;

a plurality of counters provided according to said plurality of preset signal thresholds respectively;

count-number memory means for storing the outputs of said plurality of counters therein;

average/dispersion calculating means for calculating the average and the degree of dispersion of values obtained by counting the outputs of said plurality of counters a selected number of times with respect to the input signal; and

average/dispersion value discriminating means responsive to the output of said average/dispersion calculating means for carrying out the average and dispersion analysis of counted values during a selected reference time period as set for measurement so as to output a discrimination signal therefrom.

8. A voice/voice band data discrimination apparatus according to claim 7, further comprising a voiced sound detecting means for detecting a voiced sound from the sum of the absolute-value voltages of the input signal.