This paper addresses the problem of single-channel speech enhancement in the adverse environment. The critical-band rate scale based on improved multi-band spectral subtraction is investigated in this study for enhanc...This paper addresses the problem of single-channel speech enhancement in the adverse environment. The critical-band rate scale based on improved multi-band spectral subtraction is investigated in this study for enhancement of single-channel speech. In this work, the whole speech spectrum is divided into different non-uniformly spaced frequency bands in accordance with the critical-band rate scale of the psycho-acoustic model and the spectral over-subtraction is carried-out separately in each band. In addition, for the estimation of the noise from each band, the adaptive noise estimation approach is used and does not require explicit speech silence detection. The noise is estimated and updated by adaptively smoothing the noisy signal power in each band. The smoothing parameter is controlled by a-posteriori signal-to-noise ratio (SNR). For the performance analysis of the proposed algorithm, the objective measures, such as, SNR, segmental SNR, and perceptual evaluations of the speech quality are conducted for the variety of noises at different levels of SNRs. The speech spectrogram and objective evaluations of the proposed algorithm are compared with other standard speech enhancement algorithms and proved that the musical structure of the remnant noise and background noise is better suppressed by the proposed algorithm.展开更多
城市综合能源系统(urban integrated energy system,UIES)作为城市能源生产、运输、消费的载体,其运行中需要具备充足的灵活性来应对各种不确定波动。从灵活性的定义出发,该文提出基于不确定量波动范围的灵活性调度指标。为降低传统区...城市综合能源系统(urban integrated energy system,UIES)作为城市能源生产、运输、消费的载体,其运行中需要具备充足的灵活性来应对各种不确定波动。从灵活性的定义出发,该文提出基于不确定量波动范围的灵活性调度指标。为降低传统区间数在描述不确定量时由于概率信息丢失而导致的决策保守性,提出采用考虑相关性的多带区间数(multi-band interval number,MBIN)描述不确定量的方法,并通过历史数据和插值法得到连续的累积分布函数。提出以运行成本最小和可容纳室外温度和光照强度不确定波动范围最大的UIES多目标区间优化调度模型。采用区间可能度方法处理含有传统区间数和考虑相关性的MBIN的约束条件,将原问题转化为确定性多目标混合整数线性规划问题。通过一种直接求解多目标优化问题折中最优解的方法,将此问题进一步转化为可以高效求得折中最优解的单目标混合整数线性规划问题。最后,通过一个含有农业-工业-商业园区的实际UIES的算例分析,结果验证所提出模型和求解方法的正确有效性。展开更多
文摘This paper addresses the problem of single-channel speech enhancement in the adverse environment. The critical-band rate scale based on improved multi-band spectral subtraction is investigated in this study for enhancement of single-channel speech. In this work, the whole speech spectrum is divided into different non-uniformly spaced frequency bands in accordance with the critical-band rate scale of the psycho-acoustic model and the spectral over-subtraction is carried-out separately in each band. In addition, for the estimation of the noise from each band, the adaptive noise estimation approach is used and does not require explicit speech silence detection. The noise is estimated and updated by adaptively smoothing the noisy signal power in each band. The smoothing parameter is controlled by a-posteriori signal-to-noise ratio (SNR). For the performance analysis of the proposed algorithm, the objective measures, such as, SNR, segmental SNR, and perceptual evaluations of the speech quality are conducted for the variety of noises at different levels of SNRs. The speech spectrogram and objective evaluations of the proposed algorithm are compared with other standard speech enhancement algorithms and proved that the musical structure of the remnant noise and background noise is better suppressed by the proposed algorithm.
