Pitch analyzer using log-tapped delay line
AssigneeThe United States of America as represented by the Secretary of the Army
InventorWilliam A. Blankinship
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Abstract
A pitch analyzer is described which extracts, on a real-time or pipeline is, the pitch information from a speech signal. The analyzer converts the speech signal to a digital signal, shifts it into a delay line tapped at logarithmic intervals and constructs a measure of merit for each of many possible pitch periods. These measures are periodically transferred to a processor which combines them in a prescribed manner with previous information to select the one most-likely current value of pitch. Provision is also made, when the application warrants it, to select the best pitch value, with a delay of several frames, based on current information.
Claims4
A pitch analyzer, comprising:
- means for digitizing an analog speech signal;
- a delay line into which said digitized signal may be sequentially inserted;
- means for periodically extracting the contents of selected stages of the delay line, the selected stages being spaced at substantially logarithmic intervals;
- and
- means for periodically testing said extracted contents to determine an optimum choice of pitch period.
Dependencies are inferred from the claim text.