发明名称 |
HARMONICITY ESTIMATION, AUDIO CLASSIFICATION, PITCH DETERMINATION AND NOISE ESTIMATION |
摘要 |
Embodiments are described for harmonicity estimation, audio classification, pitch determination and noise estimation. Measuring harmonicity of an audio signal includes calculation a log amplitude spectrum of audio signal. A first spectrum is derived by calculating each component of the first spectrum as a sum of components of the log amplitude spectrum on frequencies. In linear frequency scale, the frequencies are odd multiples of the component's frequency of the first spectrum. A second spectrum is derived by calculating each component of the second spectrum as a sum of components of the log amplitude spectrum on frequencies. In linear frequency scale, the frequencies are even multiples of the component's frequency of the second spectrum. A difference spectrum is derived subtracting the first spectrum from the second spectrum. A measure of harmonicity is generated as a monotonically increasing function of the maximum component of the difference spectrum within predetermined frequency range. |
申请公布号 |
WO2013142652(A3) |
申请公布日期 |
2013.11.14 |
申请号 |
WO2013US33232 |
申请日期 |
2013.03.21 |
申请人 |
DOLBY LABORATORIES LICENSING CORPORATION |
发明人 |
SUN, XUEJING;SHUANG, ZHIWEI;HUANG, SHEN |
分类号 |
G10L25/90;G10L21/0232;G10L25/84 |
主分类号 |
G10L25/90 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|