Tonhöhenextraktor für Sprache mit Gleichstromanzeige

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Abstract
The extraction of the fundamental frequency parameter from the dynamic structure of speech has proved to be much more difficult than had been supposed, as attempts to control the pitch of synthetic speech have shown. The principle commonly employed in fundamental frequency measurement consists in extracting impulses of constant amplitude from the speech wave, and rectifying to obtain themean value of the varying density of impulses. Rectifying and volume control produce inertion which reduces the information content. Nevertheless, in representing longer stretches of speech as opposed to single phonemes, the newly developed pitch meter is fully efficient.

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