Real time pitch detection by stream processing
First Claim
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1. A method for detecting the pitch of a speech pattern, comprising the steps of:
- sampling a speech pattern at spaced time intervals to form a series of sample signals representative of the pattern;
gating every Qth sample, Q between 2 and 6, into a storage device, thereby storing a predetermined number of past samples, andprocessing said original samples and said stored Qth samples to generate a signal representative of the pitch of the speech pattern.
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Abstract
Continuous stream processing of an input signal to find the autocorrelation function and pitch period is simplied. The input speech signal is sampled at 8 khz, from which the autocorrelation function is formed by multiplying each sample by a stored-delay reduced sequence of up to 30 past samples. The reduced sequence is formed by every fourth sample of input signal gated to storage. Autocorrelation values are sequentially compared by a peak-peaker for maxima, thus further minimizing storage requirements to find the pitch period.
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Citations
12 Claims
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1. A method for detecting the pitch of a speech pattern, comprising the steps of:
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sampling a speech pattern at spaced time intervals to form a series of sample signals representative of the pattern; gating every Qth sample, Q between 2 and 6, into a storage device, thereby storing a predetermined number of past samples, and processing said original samples and said stored Qth samples to generate a signal representative of the pitch of the speech pattern. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for detecting the pitch of a speech pattern comprising:
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means for sampling a speech pattern at spaced time intervals to form a series of sample signals representative of the pattern; means for gating every Qth sample, Q between 2 and 6, into a storage device, thereby storing a predetermined number of past samples, and means for processing said original samples and said stored Qth samples to generate a signal representative of the pitch of the speech pattern. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification