Digital system for changing the rate of recorded speech

Details Digital system for changing the rate of recorded speech Digital system for changing the rate of recorded speech

1979-07-30

1981-01-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Converting an analog signal to digital form for recording;...

360 8, G11B 500

Patent

active

042466172

ABSTRACT:
Representation of a speech signal by its short-time Fourier transform and the application of this representation to the problem of time compression and expansion of speech are presented. A time-frequency representation for linear time-varying systems is applied to a model for speech production to formulate a quasi-stationary representation for the speech waveform. This representation has the property that simple time scaling of the parameters of the representation corresponds to changing the rate of the speech. Given a real speech signal, short-time Fourier analysis provides a technique for estimating and modifying these parameters. The results of the theoretical analysis are used to design a high-quality speech rate-change system which are simulated on a general-purpose digital mini-computer.

REFERENCES:
patent: 3777308 (1973-12-01), Borkovosky et al.

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