PITCH RANGE REFINEMENT
First Claim
1. A method of refining a pitch period estimation of a signal, the method comprising:
- for each of a plurality of portions of the signal, scanning over a predefined range of time offsets to find an estimate of the pitch period of the portion within the predefined range of time offsets;
identifying the average pitch period of the estimated pitch periods of the portions;
determining a refined range of time offsets in dependence on the average pitch period, the refined range of time offsets being narrower than the predefined range of time offsets; and
for a subsequent portion of the signal, scanning over the refined range of time offsets to find an estimate of the pitch period of the subsequent portion.
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Accused Products
Abstract
A method of refining a pitch period estimation of a signal, the method comprising: for each of a plurality of portions of the signal, scanning over a predefined range of time offsets to find an estimate of the pitch period of the portion within the predefined range of time offsets; identifying the average pitch period of the estimated pitch periods of the portions; determining a refined range of time offsets in dependence on the average pitch period, the refined range of time offsets being narrower than the predefined range of time offsets; and for a subsequent portion of the signal, scanning over the refined range of time offsets to find an estimate of the pitch period of the subsequent portion.
16 Citations
15 Claims
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1. A method of refining a pitch period estimation of a signal, the method comprising:
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for each of a plurality of portions of the signal, scanning over a predefined range of time offsets to find an estimate of the pitch period of the portion within the predefined range of time offsets; identifying the average pitch period of the estimated pitch periods of the portions; determining a refined range of time offsets in dependence on the average pitch period, the refined range of time offsets being narrower than the predefined range of time offsets; and for a subsequent portion of the signal, scanning over the refined range of time offsets to find an estimate of the pitch period of the subsequent portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A pitch period estimation apparatus, comprising:
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a pitch period estimation module configured for each of a plurality of portions of a signal to scan over a predefined range of time offsets to find an estimate of the pitch period of the portion within the range of time offsets; an average determination module configured to identify the average pitch period of the estimated pitch periods of the portions; and a time offset range adaptation module configured to determine a refined range of time offsets in dependence on the average pitch period, the refined range of time offsets being narrower than the predefined range of time offsets; wherein the pitch period estimation module is further configured for a subsequent portion of the signal to scan over the refined range of time offsets to find an estimate of the pitch period of the subsequent portion. - View Dependent Claims (12, 13, 14, 15)
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Specification