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Noise Masking Threshold 噪音掩蔽阈值
First, VAD is done to noisy speech, then spectral subtraction based on the perceptual mask threshold follows to achieve noise reduction. 这种新算法源于VAD技术及谱减法,它先对含噪声信号进行VAD处理,而后是基于感知掩蔽阈值的谱减法运算,降低噪声,获得清晰的增强信号。
A wavelet visible watermarking algorithm is proposed based on noise masking, then the improvement is made based on texture feature of watermark image. 摘要根据图像的噪声掩蔽性设计了一种小波域可见水印算法，并根据水印图像的纹理特征对算法作了进一步改进。
A wavelet visible watermarking algorithm is proposed based on noise masking,then the improvement is made based on texture feature of watermark image. 根据图像的噪声掩蔽性设计了一种小波域可见水印算法,并根据水印图像的纹理特征对算法作了进一步改进。
Digital audio watermarking embedding algorithm based on auditory masking model is proposed, embedding watermarking by quantizing low-band coefficients of DCT transformation based on masking threshold. 摘要提出一种基于听觉掩蔽模型的音频数字水印算法，根据掩蔽阈值量化音频经DCT变换后的低频系数来嵌入水印。
Auditory Masking Threshold (AMT) 听觉掩蔽门限
Audio signal was segmented into frames and the masking thresholds of all sub-bands were estimated by psychoacoustic analysis. 算法将音频信号分帧进行心理声学模型分析,估计频域中各子带的最小掩蔽阈值;
And the image bits were hidden in the sub-bands below the masking thresholds,which made the audio signal little perceptual distortion and the image invisible. 然后将图像转化为比特流隐藏于音频信号频域子带,并用掩蔽阈值控制嵌入强度。
A loud noise from the street diverted my attention. 街上一阵喧闹声转移了我的注意力。
The cabin has a flat stone for a threshold. 这间小屋用一条扁平的石头做门槛。
The treaty will be the threshold of lasting peace. 这个条约将成为持久和平的开端。
The noise awoke her from her revery. 这声音把我她从沉思中惊醒。
He wore a mask so that no one should recognize him. 他戴了一个面罩，使别人认不出他来。
That noise is driving me frantic. 那种噪音真要把我弄疯了。
He was on the threshold of his career. 他的事业刚刚起步。
The thick walls deadened the noise from the street. 这道厚墙隔绝了街上的噪音。
A noise abatement notice is served on the club. 向俱乐部发停止大声喧哗的通知。
There must be a threshold of thermal noise. 必有一个热噪声的门限值。
The noise of traffic grows louder and louder. 交通的噪音变得愈来愈大。
He had never crossed the threshold of a bar before. 他过去从未进过酒吧的门。