Speech signal fundamental period extractor
First Claim
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1. A speech signal fundamental period extractor comprising:
- means for removing unnecesary high-frequency components from a residual value of a speech wave;
means for quantizing the output signal from said high-frequency component removing means to obtain only the low-bit quantization thereof;
an autocorrelator means supplied with the low-bit quantization of the output signal from said quantizing means for calculating a correlation coefficient thereof; and
means for obtaining the fundamental period of speech by selecting the position of a maximum correlation coefficient from the output of said autocorrelator.
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Abstract
A speech signal fundamental period extractor which receives a residual value signal from a speech analyzer, such as one using autocorrelators. The residual value signal is first passed through a filter to remove the high-frequency components. Then the signal is quantized to obtain low-bit quantization of the residual value. The output from the quantizer is then sent to an autocorrelator to obtain the correlation coefficient and the fundamental period is extracted by selecting the position of a maximum correlation coefficient. This provides more accurate results and permits the use of low-speed elements and a reduction of components.
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9 Claims
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1. A speech signal fundamental period extractor comprising:
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means for removing unnecesary high-frequency components from a residual value of a speech wave; means for quantizing the output signal from said high-frequency component removing means to obtain only the low-bit quantization thereof; an autocorrelator means supplied with the low-bit quantization of the output signal from said quantizing means for calculating a correlation coefficient thereof; and means for obtaining the fundamental period of speech by selecting the position of a maximum correlation coefficient from the output of said autocorrelator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A speech signal fundamental period extractor comprising:
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a digital filter means having a cut-off frequency of between 500 and 1000 Hz for removing high-frequency components from a residual value of a speech wave applied thereto, said filter means having an inverse characteristic of a spectrum approximating the speech signal; means for quantizing the output signal from said digital filter to obtain low-bit quantization thereof; autocorrelator means for calculating an autocorrelation coefficient of the output signal from said quantizing means; and means for obtaining the fundamental period of speech by selecting the position of a maximum value of said autocorrelation coefficient. - View Dependent Claims (9)
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Specification