Method and apparatus for discriminating non-sounds and voiceless sounds of speech signals from each other
First Claim
1. A method for discriminating non-sounds and voiceless sounds of speech signals, recorded on a recording medium, from each other when playing back the speech signals at a varied play-back speed, comprising the steps of:
- setting a reference voltage level to be a predetermined value between a voltage level corresponding to the non-sounds and a voltage level corresponding to the voiceless sounds;
detecting a pitch component of each waveform of the speech signals;
comparing the absolute value of a voltage level of the detected pitch component with the reference voltage level; and
distinguishing a portion of the speech signal associated with the detected pitch component based on the result of the comparing step to determine whether the portion of the speech signal is a non-sound or a voiceless.
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Accused Products
Abstract
A method and apparatus for discriminating non-sounds and voiceless sounds of speech signals, recorded on a recording medium, from each other when playing back the speech signals at a varied play-back speed. The method includes the steps of setting, as a reference voltage level, an optional value between a voltage level corresponding to non-sounds and a voltage level corresponding to voiceless sounds, detecting a pitch component of each waveform of the speech signals, comparing the absolute value of a voltage level of the detected pitch component with the reference voltage level, and distinguishing and outputting a portion of the speech signal associated with the detected pitch component based on the result of the comparison. The apparatus includes a waveform splitter for splitting each waveform of the speech signals at a predetermined time interval, a level modulator for modulating the level of each split speech signal waveform to remove a DC component included in the speech signal waveform, a pitch detector for detecting the voltage level of a pitch component of each modulated speech signal waveform, a comparator for comparing the detected voltage level of the pitch component with a reference voltage level initially set, and a switch for selectively switching each split speech signal waveform on the basis of the result of the comparison.
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Citations
7 Claims
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1. A method for discriminating non-sounds and voiceless sounds of speech signals, recorded on a recording medium, from each other when playing back the speech signals at a varied play-back speed, comprising the steps of:
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setting a reference voltage level to be a predetermined value between a voltage level corresponding to the non-sounds and a voltage level corresponding to the voiceless sounds; detecting a pitch component of each waveform of the speech signals; comparing the absolute value of a voltage level of the detected pitch component with the reference voltage level; and distinguishing a portion of the speech signal associated with the detected pitch component based on the result of the comparing step to determine whether the portion of the speech signal is a non-sound or a voiceless. - View Dependent Claims (2, 3, 4)
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5. An apparatus for discriminating non-sounds and voiceless sounds of speech signals, recorded on a recording medium, from each other when playing back the speech signals at a varied play-back speed, comprising:
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a waveform splitter for splitting each waveform of the speech signals at a predetermined time interval; a level modulator for modulating the level of each speech signal waveform obtained by the splitting operation of the waveform splitter to remove a DC component included in the speech signal waveform; a pitch detector for detecting the voltage level of a pitch component of each speech signal waveform modulated in level by the level modulator; a comparator for comparing the absolute value of the voltage level of the pitch component detected by the pitch detector with a predetermined reference voltage level which is higher than the absolute value of the voltage level of the pitch component of the non-sounds detected by the pitch detector, and lower than the absolute value of the voltage level of the voiceless sounds detected by the pitch detector; and a switch for selectively outputting each speech signal waveform obtained by the splitting operation of the waveform splitter based on the result of the comparison by the comparator. - View Dependent Claims (6, 7)
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Specification