Speech synthesizer having speech time stretch and compression fu

Details Speech synthesizer having speech time stretch and compression fu Speech synthesizer having speech time stretch and compression fu

1980-09-30

1984-03-06

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 51, G10L 100

Patent

active

044358326

ABSTRACT:
A speech synthesizer is disclosed with the capability of stretching and compressing the speech time base without changing the pitch of the synthesized speech. One frame of speech is represented during a given time base by LPC parameters which are sampled a constant number of times per frame and stored in memory. Speech is synthesized by fetching each of the stored LPC parameters for each frame and subjecting the parameters to interpolation, synthesizing the interpolated parameters and converting the synthesized parameters to analog format. A decrease in the speed of the reproduced speech is produced by lengthening the time interval of interpolation between the fetching of each of the stored LPC parameters which have been previously stored for each frame. An increase in the speed of the reproduced speech is produced by decreasing the time interval of interpolation between the fetching of each of the stored LPC parameters which have been previously stored in each frame.

REFERENCES:
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Cole, "A Real-Time Floating Point Vocoder", IEEE Conf. Record, Acoustics, Speech, 1977, pp. 429-430.
David, "Note on Pitch-Synchronous Processing of Speech", J. of Acoustic Soc. of Am., Nov. 1956, pp. 1261-1266.
Smith, "Single Chip Speech Synthesizers", Computer Design, Nov. 1978, pp. 188-192.

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