System and method for sound recognition with feature selection synchronized to voice pitch
First Claim
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1. A method of transforming a sound signal having positive pressure wave portions and negative pressure wave portions into character signals, said method comprising the steps of:
- (a) producing an analog signal representing said sound signal;
(b) producing a binary signal having a "1" level during positive pressure wave portions of said sound signal and a "0" level during negative pressure wave portions of said sound signal;
(c) detecting the peak amplitude of each pitch cycle of said analog signal and producing a pitch cycle marker signal synchronized to a maximum peak amplitude portion of said analog signal;
(d) producing a first number that represents the duration of a "1" level of said binary signal most closely following a pulse of said pitch cycle marker signal and producing a second number that represents the duration of the next most closely following "1" level of said binary signal;
(e) producing a character vector having a magnitude and a direction from said first and second numbers and comparing said character vector with a plurality of stored vectors to determine if said character vector matches any of said stored vectors; and
(f) producing a character signal representing a sound corresponding to a one of said stored vectors that matches said character vector.
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Abstract
Speech signals are transformed into phoneme identification signals which represent the first two positive slope durations following the maximum peak amplitude of a pitch cycle.
293 Citations
40 Claims
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1. A method of transforming a sound signal having positive pressure wave portions and negative pressure wave portions into character signals, said method comprising the steps of:
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(a) producing an analog signal representing said sound signal; (b) producing a binary signal having a "1" level during positive pressure wave portions of said sound signal and a "0" level during negative pressure wave portions of said sound signal; (c) detecting the peak amplitude of each pitch cycle of said analog signal and producing a pitch cycle marker signal synchronized to a maximum peak amplitude portion of said analog signal; (d) producing a first number that represents the duration of a "1" level of said binary signal most closely following a pulse of said pitch cycle marker signal and producing a second number that represents the duration of the next most closely following "1" level of said binary signal; (e) producing a character vector having a magnitude and a direction from said first and second numbers and comparing said character vector with a plurality of stored vectors to determine if said character vector matches any of said stored vectors; and (f) producing a character signal representing a sound corresponding to a one of said stored vectors that matches said character vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for transforming a sound signal having positive pressure wave portions and negative pressure wave portions into character signals, said system comprising:
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(a) means for producing an analog signal representing said sound signal; (b) means responsive to said analog signal producing means for producing a binary siganl having a "1" level during positive pressure wave portions of said sound signal and a "0" level during negative pressure wave portions of said sound signal; (c) means reponsive to said analog signal producing means for detecting the peak amplitude of each pitch cycle of said analog signal and producing a corresponding pitch cycle marker signal synchronized to a maximum peak amplitude portion of said analog signal; (d) means responsive to said binary signal for producing a first number that represents the duration of a "1" level of said binary signal most closely following a pulse of said pitch cycle marker signal and producing a second number that represents the duration of the next most closely following "1" level of said binary signal; (e) means for producing a character vector having a magnitude and a direction from said first and second numbers and comparing said character vector with a plurality of stored vectors to determine if said character vector matches any of said stored vectors; and (f) means for producing a character signal representing a sound corresponding to a one of said stored vectors that matches said character vector. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of transforming positive pressure waves and negative pressure waves from a sound signal into phoneme identification signals, said method comprising the steps of:
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(a) producing an analog signal representative of said sound signal; (b) producing a first bandwidth-limited analog signal representing said sound signal in response to said analog signal; (c) producing a binary signal having a "1" level during positive pressure wave portions of said sound signal and a "0" level during negative pressure wave portions of said sound signal; (d) concurrently, producing, in response to said analog signal, a second bandwidth-limited analog sound signal representing low frequency components of said analog signal for detecting the peak amplitude of each pitch cycle of said analog signal and producing a pitch cycle marker signal synchronized to a maximum peak amplitude portion of said analog signal; (e) producing a first number that represents the duration of a "1" level of said binary signal most closely following the onset of said pitch cycle marker signal and producing a second number that represents the duration of the next most closely following "1" level of said binary signal; (f) producing a character vector having a magnitude and a direction from said first and second time duration numbers and comparing said character vector with a stored map composed of a plurality of vector boundary regions to determine which of the said vector boundary regions contains said character vector; and (g) producing a phoneme identification signal representing a sound corresponding to a one of said stored vector regions that matches said character vector. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for transforming positive pressure waves and negative pressure waves from a sound signal into phoneme identification signals, said system comprising:
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(a) means responsive to said sound signal for producing an analog signal representative of said analog signal; (b) means responsive to said analog signal for producing a first bandwidth-limited analog signal representing said sound signal in response to said analog signal; (c) means responsive to said bandwidth-limited analog signal for producing a binary signal having a "1" level during positive pressure wave portions of said sound signal and a "0" level during negative pressure wave portions of said sound signal; (d) means responsive to said analog signal for producing a second bandwidth-limited analog sound signal representing low frequency components of said analog signal; (e) means responsive to said second bandwidth-limited analog signal for detecting the peak amplitude of each pitch cycle of said analog signal and producing a pitch cycle marker signal synchronized to a maximum peak amplitude portion of said analog signal; (f) means responsive to said binary signal for producing a first number that represents the duration of a "1" level of said binary signal most closely following the onset of said pitch cycle signal and producing a second number that represents the duration of the next most closely following "1" level of said binary signal; (g) means for producing a character vector from said first and second time duration numbers and means for comparing said character vector with a stored map composed of a plurality of vector boundary regions to determine which of the said vector boundary regions contains said character vector; and (h) means for producing a phoneme identification system representing a sound corresponding to a one of said stored vector regions that matches said character vector. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification