Pitch Or Periodicity Estimation
First Claim
1. A method of estimating a pitch period of a first portion of a signal, the first portion overlapping a previous portion, the method comprising:
- computing a first autocorrelation value for part of the first portion not overlapping the previous portion;
retrieving a stored second autocorrelation value for part of the first portion overlapping the previous portion, the second autocorrelation value having been computed during estimation of a pitch period of the previous portion;
forming a combined autocorrelation value using the first and second autocorrelation values; and
selecting the estimated pitch period in dependence on the combined autocorrelation value.
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Accused Products
Abstract
A method of estimating a pitch period of a first portion of a signal wherein the first portion overlaps a previous portion. The method comprises computing a first autocorrelation value for part of the first portion not overlapping the previous portion. The method further comprises retrieving a stored second autocorrelation value for part of the first portion overlapping the previous portion, the second autocorrelation value having been computed during estimation of a pitch period of the previous portion. The method further comprises forming a combined autocorrelation value using the first and second autocorrelation values, and selecting the estimated pitch period in dependence on the combined autocorrelation value.
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Citations
17 Claims
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1. A method of estimating a pitch period of a first portion of a signal, the first portion overlapping a previous portion, the method comprising:
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computing a first autocorrelation value for part of the first portion not overlapping the previous portion; retrieving a stored second autocorrelation value for part of the first portion overlapping the previous portion, the second autocorrelation value having been computed during estimation of a pitch period of the previous portion; forming a combined autocorrelation value using the first and second autocorrelation values; and selecting the estimated pitch period in dependence on the combined autocorrelation value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of estimating a periodicity of a first portion of a signal, the first portion overlapping a previous portion, the method comprising:
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computing a first autocorrelation value for part of the first portion not overlapping the previous portion; retrieving a stored second autocorrelation value for part of the first portion overlapping the previous portion, the second autocorrelation value having been computed during estimation of a periodicity of the previous portion; forming a combined autocorrelation value using the first and second autocorrelation values; and selecting the estimated periodicity in dependence on the combined autocorrelation value.
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Specification