发明名称 |
Audio analysis/synthesis system |
摘要 |
A method and apparatus for the automatic analysis, synthesis and modification of audio signals, based on an overlap-add sinusoidal model, is disclosed. Automatic analysis of amplitude, frequency and phase parameters of the model is achieved using an analysis-by-synthesis procedure which incorporates successive approximation, yielding synthetic waveforms which are very good approximations to the original waveforms and are perceptually identical to the original sounds. A generalized overlap-add sinusoidal model is introduced which can modify audio signals without objectionable artifacts. In addition, a new approach to pitch-scale modification allows for the use of arbitrary spectral envelope estimates and addresses the problems of high-frequency loss and noise amplification encountered with prior art methods. The overlap-add synthesis method provides the ability to synthesize sounds with computational efficiency rivaling that of synthesis using the discrete short-time Fourier transform (DSTFT) while eliminating the modification artifacts associated with that method.
|
申请公布号 |
US5327518(A) |
申请公布日期 |
1994.07.05 |
申请号 |
US19910748544 |
申请日期 |
1991.08.22 |
申请人 |
GEORGIA TECH RESEARCH CORPORATION |
发明人 |
GEORGE, E. BRYAN;SMITH, MARK J. T. |
分类号 |
G10L15/12;G10L19/00;G10L19/02;G10L21/02;G10L21/04;(IPC1-7):G10L9/02 |
主分类号 |
G10L15/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|