In order to improve the performance of voice conversion, the fundamental frequency （F0） transformation methods are investigated, and an efficient F0 transformation algorithm is proposed. First, unlike the traditiona...In order to improve the performance of voice conversion, the fundamental frequency （F0） transformation methods are investigated, and an efficient F0 transformation algorithm is proposed. First, unlike the traditional linear transformation methods, the relationships between F0s and spectral parameters are explored. In each component of the Gaussian mixture model （GMM）, the F0s are predicted from the converted spectral parameters using the support vector regression （SVR） method. Then, in order to reduce the over- smoothing caused by the statistical average of the GMM, a mixed transformation method combining SVR with the traditional mean-variance linear （MVL） conversion is presented. Meanwhile, the adaptive median filter, prevalent in image processing, is adopted to solve the discontinuity problem caused by the frame-wise transformation. Objective and subjective experiments are carried out to evaluate the performance of the proposed method. The results demonstrate that the proposed method outperforms the traditional F0 transformation methods in terms of the similarity and the quality.展开更多
本文论述荷兰天文学家奥尔特(J.H.Oort,1900—)的主要天文学成就。他发现了银河系的较差自转,建立了星系较差自转的动力学理论。在他的建议和指导下,范德胡斯特(H.C.van de Hulst,1918—)从理论上预言了可观测到星际中性氢的21厘米谱线...本文论述荷兰天文学家奥尔特(J.H.Oort,1900—)的主要天文学成就。他发现了银河系的较差自转,建立了星系较差自转的动力学理论。在他的建议和指导下,范德胡斯特(H.C.van de Hulst,1918—)从理论上预言了可观测到星际中性氢的21厘米谱线。他是荷兰射电天文学的创始人,并在研究银河系的旋涡结构,探索银河系的中心区域和近距星系的星系核活动方面作出了重大贡献。此外,在太阳系研究方面提出了著名的原彗星云假说。展开更多
The signal to noise ratio （SNR） of conventional sigma delta analog to digital converter （∑△ADC） reduces with input signal strength. The existing concept of adaptive quantization is applied to the design of ∑△A...The signal to noise ratio （SNR） of conventional sigma delta analog to digital converter （∑△ADC） reduces with input signal strength. The existing concept of adaptive quantization is applied to the design of ∑△ADC to improve SNR with high dynamic range. An adaptive algorithm and its circuit implementation is proposed. Because of the error due to the circuit implementation, an error self-calibration circuit is also designed. Simulation results indicate that SNR can he nearly independent of the signal strength.展开更多
基金The National Natural Science Foundation of China(No. 60975017)the Natural Science Foundation of Guangdong Province (No. 10252800001000001)the Natural Science Foundation of Higher Education Institutions of Jiangsu Province (No. 10KJB510005)
文摘In order to improve the performance of voice conversion, the fundamental frequency （F0） transformation methods are investigated, and an efficient F0 transformation algorithm is proposed. First, unlike the traditional linear transformation methods, the relationships between F0s and spectral parameters are explored. In each component of the Gaussian mixture model （GMM）, the F0s are predicted from the converted spectral parameters using the support vector regression （SVR） method. Then, in order to reduce the over- smoothing caused by the statistical average of the GMM, a mixed transformation method combining SVR with the traditional mean-variance linear （MVL） conversion is presented. Meanwhile, the adaptive median filter, prevalent in image processing, is adopted to solve the discontinuity problem caused by the frame-wise transformation. Objective and subjective experiments are carried out to evaluate the performance of the proposed method. The results demonstrate that the proposed method outperforms the traditional F0 transformation methods in terms of the similarity and the quality.
文摘本文论述荷兰天文学家奥尔特(J.H.Oort,1900—)的主要天文学成就。他发现了银河系的较差自转,建立了星系较差自转的动力学理论。在他的建议和指导下,范德胡斯特(H.C.van de Hulst,1918—)从理论上预言了可观测到星际中性氢的21厘米谱线。他是荷兰射电天文学的创始人,并在研究银河系的旋涡结构,探索银河系的中心区域和近距星系的星系核活动方面作出了重大贡献。此外,在太阳系研究方面提出了著名的原彗星云假说。
文摘The signal to noise ratio （SNR） of conventional sigma delta analog to digital converter （∑△ADC） reduces with input signal strength. The existing concept of adaptive quantization is applied to the design of ∑△ADC to improve SNR with high dynamic range. An adaptive algorithm and its circuit implementation is proposed. Because of the error due to the circuit implementation, an error self-calibration circuit is also designed. Simulation results indicate that SNR can he nearly independent of the signal strength.
