Inverse transform narrow band/broad band sound synthesis

Details Inverse transform narrow band/broad band sound synthesis Inverse transform narrow band/broad band sound synthesis

1995-10-23

1997-11-11

Wysocki, Jonathan

Music

Instruments

Electrical musical tone generation

84603, 84622, G01H 700, G01H 710

Patent

active

056866836

ABSTRACT:
An additive sound synthesis process for generating complex, realistic sounds is realized in a computationally efficient manner. In accordance with one aspect of the invention, polyphony is efficiently achieved by dosing the energy of a given partial between separate transform sums corresponding to different channels. In accordance with another aspect of the invention, noise is injected by randomly perturbing the phase of the sound, either on a per-partial basis or on a transform-sum basis. In the latter instance, the phase is perturbed in different regions of the spectrum to a degree determined by the amount of energy present in the respective regions of the spectrum. In accordance with yet another aspect of the invention, a transform sum representing a sound is processed in the transform domain to achieve with great economy effects achievable only at much greater expense outside the transform domain. Other transforms besides the Fourier transform may be used to advantage. For example, use of the Hartley transform produces comparable results but allows transforms to be computed at approximately twice the speed as the Fourier transform.

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George et al., "A New Speech Coding Model Based on a Least-Squares Sinusoidal Representation", School of Electrical Engineering, Georgia Institute of Technology .
George et al., "Analysis-by-Synthesis/Overlap/Add Sinusoidal Modeling Applied to the Analysis and Synthesis of Musical Tones", J. Audio Eng. Soc., 40:6, (1992).
George et al., "Generalized Overlap-Add Sinusoidal Modeling Applied to Quasi-Harmonic Tone Synthesis", Signal Processing Center of Technology, Lockheed Sanders, Inc., School of Electrical Engineering, Georgia Institute of Technology.
Lemke, M. et al., "Synthesis to time-dependent signals for simulation experiments", Abstract, VDI Zeitschrift 120, 10:475-82 (1978).
Race, "Race Insertion Interpolation", DSP Development Corporation.

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