Method for building a timbre sample databank for a waveform table
US6020550A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1999 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | May 17, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2250/235
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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 pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.