Speech Transformations Based on a Sinusoidal Representation
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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In this report, a new speech analysissynthesis technique is presented which provides the basis for a general class of speech transformation including time-scale modification, frequency scaling, and pitch modification. These modifications can be performed with a time-varying change, permitting continuous adjustment of a speakers fundamental frequency and rate of articulation. The method is based on a sinusoidal representation of the speech production mechanism that has been shown to produce synthetic speech that preserves the waveform shape and is essentially perceptually indistinguishable from the original. Although the analysissynthesis system originally was designed for single-speaker signals, it is equally capable of recovering and modifying nonspeech signals such as music multiple speakers, marine biologic sounds, and speakers in the presence of interferences such as noise and musical backgrounds. Keywords Sinusoidal models Sine waves Timer varying modifications Joint time frequency modifications.