Method for building a timbre sample databank for a waveform tabl

Details Method for building a timbre sample databank for a waveform tabl Method for building a timbre sample databank for a waveform tabl

1999-05-17

2000-02-01

Sircus, Brian

Music

Instruments

Electrical musical tone generation

84608, 84622, 84659, G10H 700

Patent

active

060205504

ABSTRACT:
An improved method for forming a timbre sample (Q sample) is described. A first Q sample is extracted. A fixed length of the first Q sample is extracted to form a first QL. A portion of the first Q sample other than the first QL is treated as a first pre-waveform. A last portion of the first pre-waveform is extracted and is processed with the second Q sample by a first COS modulation so as to obtain a second QL, which is connected to the first pre-waveform to form a second Q sample. A first period waveform of the second QL and a last portion of the first pre-waveform are processed by a second COS modulation to form a single period QL. Repeating the single period QL forms a third QL. Connecting the third QL to the first pre-waveform forms a third Q sample. The second QL is transformed by a digital Fourier transformation, and its high frequency modes are removed. The transformed second QL is inversely transformed back by an inverse digital Fourier transformation to form a fourth QL. Adding the third QL and the fourth QL forms a fifth WL sample, which power is properly normalized. A second pre-waveform is obtained by repeating the sixth QL. The first and second of pre-waveforms are processed by a linear cross fading algorithm to form a third pre-waveform. The third pre-waveform and the sixth QL are connected together to obtain an improved Q sample.

REFERENCES:
patent: 5288940 (1994-02-01), Izumisawa
patent: 5672836 (1997-09-01), Yoshida
patent: 5808220 (1998-09-01), Yang
patent: 5808222 (1998-09-01), Yang

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