FFT based sine wave synthesis method for parametric vocoders

Details FFT based sine wave synthesis method for parametric vocoders FFT based sine wave synthesis method for parametric vocoders

2005-01-18

2005-01-18

McFadden, Susan (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

C704S258000, C704S268000, C704S269000

Reexamination Certificate

active

06845359

ABSTRACT:
A Fast Fourier Transform (FFT) based voice synthesis method110,program product and vocoder. Sounds, e.g., speech and audio, are synthesized from multiple sine waves. Each sine wave component is represented by a small number of FFT coefficients116.Amplitude120and phase124information of the components may be incorporated into these coefficients. The FFT coefficients corresponding to each of the components are summed126and, then, an inverse FFT is applied128to the sum to generate a time domain signal. An appropriate section is extracted130from the inverse transformed time domain signal as an approximation to the desired output. FFT based synthesis110may be combined with simple sine wave summation100,using FFT based synthesis110for complex sounds, e.g., male voices and unvoiced speech, and sine wave summation100for simpler sounds, e.g., female voices.

REFERENCES:
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T.V. Ramabadran et al., “An efficient synthesis method for sinusoidal vocoders,” Proc. IEEE Workshop on Speeching Coding 2000, pp.44-46, Sep. 2000.*
R.J. McAulay et al., “Computational efficient sine-wave synthesis and its application to sinusoidal transform coding,” ICASSP '88, vol. 1, pp.370-373, Apr. 1988.*
R.J. McAulay et al., “Speech analysis/synthesis based on a sinusoidal representation,” IEEE Trans. on Acoustics, Speech, and Signal Processing, vol.34, No. 4, pp.744-754, Aug. 1986.

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