A new spectral coding approach,one-step interpolation predictive vectorquantimtion of the LineSPectrum Pair(LSP)coding,is proposed. With the use of the sufficient correlation of successive LSP vectorsand because of re...A new spectral coding approach,one-step interpolation predictive vectorquantimtion of the LineSPectrum Pair(LSP)coding,is proposed. With the use of the sufficient correlation of successive LSP vectorsand because of relatively slow variation of the short term spectrum of the speech waveform, the idea ofpredictive vector quantization and DPCM techniques are used to reduce variance Of the parameters to be quantics.18 bit/home split vector quantization scheme is designed to quantize the prediction residual.The average spectral distortion of 1.178 dB can be achieved when frame period is 30ms.展开更多
The quasinormal mode frequencies can be understood from the massless particles trapped at the unstable circular null geodesics and slowly leaking out to infinity. Based on this viewpoint, in this paper, we semiclassic...The quasinormal mode frequencies can be understood from the massless particles trapped at the unstable circular null geodesics and slowly leaking out to infinity. Based on this viewpoint, in this paper, we semiclassically construct the entropy spectrum of the static and stationary black holes from the null geodesics. The result shows that the spacing of the entropy spectrum only depends on the property of the black hole in the eikonal limit. Moreover, for a black hole far from the extremal case, the spacing is found to be smaller than 2π for any dimension, which is very different from the result of the previous work by using the usual quasinormal mode frequencies.展开更多
文摘A new spectral coding approach,one-step interpolation predictive vectorquantimtion of the LineSPectrum Pair(LSP)coding,is proposed. With the use of the sufficient correlation of successive LSP vectorsand because of relatively slow variation of the short term spectrum of the speech waveform, the idea ofpredictive vector quantization and DPCM techniques are used to reduce variance Of the parameters to be quantics.18 bit/home split vector quantization scheme is designed to quantize the prediction residual.The average spectral distortion of 1.178 dB can be achieved when frame period is 30ms.
基金supported by the National Natural Science Foundation of China(Grant Nos.1120507411375075 and 11522541)the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2015-jl01)
文摘The quasinormal mode frequencies can be understood from the massless particles trapped at the unstable circular null geodesics and slowly leaking out to infinity. Based on this viewpoint, in this paper, we semiclassically construct the entropy spectrum of the static and stationary black holes from the null geodesics. The result shows that the spacing of the entropy spectrum only depends on the property of the black hole in the eikonal limit. Moreover, for a black hole far from the extremal case, the spacing is found to be smaller than 2π for any dimension, which is very different from the result of the previous work by using the usual quasinormal mode frequencies.
