In conventional source-filter models, voiced and unvoiced components were considered independently. However, in practice it was difficult to separate the source into two parts. An actual source consists of a mixture o...In conventional source-filter models, voiced and unvoiced components were considered independently. However, in practice it was difficult to separate the source into two parts. An actual source consists of a mixture of two sources and the ratio varies according to the content or the intention of speaker. It had been investigated to separate the voiced and unvoiced components for different source models. Source signals were modeled based on the residual signal measured from inverse filtering. Three different source models were assumed. The parameters of each model were optimized for the original speech signal using a genetic algorithm. The resulting parameters were compared in terms of the mel-cepstral distance to the original signal, the spectrogram and the spectral envelope from the synthesized signal. The optimization method achieves an improvement of 15% for the Klatt model, but there is little improvement in the modified residual case.展开更多
News,by no means a neutral vehicle,is in reality ideologically driven and controlled by news values to which the use of news sources is of great help.Geis once argued that the single most important power of the press ...News,by no means a neutral vehicle,is in reality ideologically driven and controlled by news values to which the use of news sources is of great help.Geis once argued that the single most important power of the press is its capacity to say what the important issues are at any particular time and to determine whose voices will be heard on any given issue(Geis,1987:10).News sources may tell readers something,but it may also mislead readers since people cannot think about and make sense out of news events without imposing a bias on the news.It is,therefore,worth our attention and effort to understand how news source works,how it affects readers'perceptions of news events,how it is produced,how it is shaped by values and ideology.展开更多
This investigation was designed to approach a novel estimation method of glottal vocal efficiency (GVE) based on conversion function of voice source. The conversion function of voice source was defined the ratio of su...This investigation was designed to approach a novel estimation method of glottal vocal efficiency (GVE) based on conversion function of voice source. The conversion function of voice source was defined the ratio of supra-glottal acoustic voice source signal to the glottal air volume flow velocity waveform in frequency domain. A carefully designed in vivo canine larynx experiment and several human experiments including different vowels, pressed, falsetto, breath and typical laryngeal diseases were adopted to demonstrate this alternative GVE method. Compared with other vocal efficiency, it is shown that this method could eliminate the contribution from the super vocal tract transmission and resonance to GVE, and reflect the differences of phonation modes. The average magnitude of this conversion function in frequency domain represents GVE, and the variation of the magnitude in fundamental frequency is identical to AC/DC value.展开更多
基金supported by the Second Stage of Brain Korea 21 Projects
文摘In conventional source-filter models, voiced and unvoiced components were considered independently. However, in practice it was difficult to separate the source into two parts. An actual source consists of a mixture of two sources and the ratio varies according to the content or the intention of speaker. It had been investigated to separate the voiced and unvoiced components for different source models. Source signals were modeled based on the residual signal measured from inverse filtering. Three different source models were assumed. The parameters of each model were optimized for the original speech signal using a genetic algorithm. The resulting parameters were compared in terms of the mel-cepstral distance to the original signal, the spectrogram and the spectral envelope from the synthesized signal. The optimization method achieves an improvement of 15% for the Klatt model, but there is little improvement in the modified residual case.
文摘News,by no means a neutral vehicle,is in reality ideologically driven and controlled by news values to which the use of news sources is of great help.Geis once argued that the single most important power of the press is its capacity to say what the important issues are at any particular time and to determine whose voices will be heard on any given issue(Geis,1987:10).News sources may tell readers something,but it may also mislead readers since people cannot think about and make sense out of news events without imposing a bias on the news.It is,therefore,worth our attention and effort to understand how news source works,how it affects readers'perceptions of news events,how it is produced,how it is shaped by values and ideology.
基金This Project was supported bythe National Natural Science Foundation ofChina and under grantsNo.69925101 and No.69871023.
文摘This investigation was designed to approach a novel estimation method of glottal vocal efficiency (GVE) based on conversion function of voice source. The conversion function of voice source was defined the ratio of supra-glottal acoustic voice source signal to the glottal air volume flow velocity waveform in frequency domain. A carefully designed in vivo canine larynx experiment and several human experiments including different vowels, pressed, falsetto, breath and typical laryngeal diseases were adopted to demonstrate this alternative GVE method. Compared with other vocal efficiency, it is shown that this method could eliminate the contribution from the super vocal tract transmission and resonance to GVE, and reflect the differences of phonation modes. The average magnitude of this conversion function in frequency domain represents GVE, and the variation of the magnitude in fundamental frequency is identical to AC/DC value.
