掩蔽值 的英文怎麼說
中文拼音 [yǎnbìzhí]
掩蔽值
英文
masking value-
In order to reduce the musical residual noise and the background noise, a speech enhancement method based on masking properties of the human auditory system is described. this method uses bark wavelet packet transform to simulate the frequency feature of human auditory model to get the threshold
本文以最大限度減少殘留噪聲和背景噪聲為目的，採用bark子波分析的方法模擬人耳基底膜的頻率分析特性來進行語音增強，重點進行模擬人耳聽覺掩蔽效應來確定除噪閾值的研究。It also analyzed the whole stress of the ribbed shell structure under the explosive load. the analytic result keeps well with that of the dynamic response of 6. 8kg tnt. it shows that this analytic method in this paper is feasible for the design and inspection of cave depot of single aircraft
通過理論計算與6 . 8kgtnt裝藥爆炸時的動力響應實測比較，兩者數值吻合很好，表明本文計算分析方法是可行的。為鋼板-混凝土拱型復合結構的設計與檢驗提供了理論基礎，為飛機單機掩蔽庫工程的設計檢驗提供了一條可行的計算分析方法。At the initial stage of planar technique, b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region, and the good shield effect of sio2 film to b. but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient, the linear slowly - changed distribution of acceptor b in pn junction can not be formed, which could not cater to the requirement of high - reversal - voltage devics. thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed, while the former can lead to relatively large the base - region deviation and abruptly varied region in si, which caused severe decentralization of current amplification parameter, bad thermal stability and high tr ; the latter needed the relatively difficult pack technique, with poor repeatability, high rejection ratio, and poor diffusion quality and productio n efficiency
在平面工藝初期，由於b在硅中的固溶度、擴散系數與n型發射區的磷相匹配， sio _ 2對其又有良好的掩蔽作用，早被選為npn硅平面器件的理想基區擴散源，但b在硅中的固溶度大（ 1000時達到5 10 ~ （ 20 ） ，擴散系數小， b在硅中的雜質分佈不易形成pn結中雜質的線性緩變分佈，導致器件不能滿足高反壓的要求，隨之又出現了硼鋁塗層擴散工藝和閉管擴鎵工藝，前者會引起較大的基區偏差，雜質在硅內存在突變區域，導致放大系數分散嚴重，下降時間t _ f值較高，熱穩定性差；後者需要難度較大的真空封管技術，工藝重復性差，報廢率高，在擴散質量、生產效率諸方面均不能令人滿意。This paper raised a new way for overlapping speech segregation based on sound localization cues. in this paper, we first divide the speech stream into some time - frequency regions and calculate the itd and iid of each region. then the notion of a " time - frequency " binary mask is given, which selects the target if it is stronger than the interference in a local time - frequency region
然後求取每個小片段上的itd （到達雙耳時間上的差異性）和iid （到達雙耳強度上的差異性）值，經過實驗證明某個片段上的itd值和iid值與該片段上的信噪能量比是單調遞增關系，因此通過和域值的比較，得出掩蔽系數，來判斷每個小片段具體是屬于哪個聲源。The masking of the auditory system is used to determine the value of each frame dynamically and the enhancement is performed selectively
演算法利用人耳的聽覺掩蔽效應動態確定每一幀的權值，有選擇地增強。Effect of spatial separation in azimuth on the threshold of forward masking in time domain
聲源空間分離對向前時域掩蔽閾值的影響Choose the frequency from 14 to 16 bark as the embedding positions which below the masking threshold. then change the dct coefficient with the certain strength of
選用中低頻14 16bark段在掩蔽閾值以下的頻率分量作為嵌入點，對該嵌入點的dct系數以一定嵌入強度作修改來實現秘密信息的嵌入。The sinusoidal modeling based on matching pursuit is studied in this thesis, and the concepts of dynamic masking threshold and perceptual gradient are proposed as well as the algorithm of sinusoidal modeling with perceptual gradient
研究了基於匹配跟蹤的正弦建模問題，提出了動態掩蔽閾值、感知梯度等概念，以及感知梯度正弦建模演算法。This thesis presents a new audio digital watermark algorithm based on has model. the steps : first, it classifies the signals through fft ; second, calculating the tones, noise and the overall masking threshold of different phases through has, and changing the energy value of tones which are more than that of the overall masking threshold to embed the watermark information
提出了一種基於人類聽覺系統（ has ）模型的音頻數字水印演算法，該演算法首先對信號進行分段離散快速傅立葉變換（ fft ） ，再根據人類聽覺系統模型計算出各段的類純音、類噪音以及各段的總體掩蔽閾值，通過改變大於總體遮蔽閾值的類純音的能量值來嵌入水印信息。But, though considerable process has been made in the last ten years, digital watermarking is still in its infancy, and much interesting work remains to be done this thesis addresses some problems in the gray - scale image digital watermarking that are summarized below : 1 ) whereas the basic theory of digital watermarking is still very poor, a digital watermarking mathematic model based on imperceptibility and robustness is presented by analysising the characteristic of digital watermarking ; 2 ) based on the model constructed above, by defining the measures of capacity and robustness of digital watermarking, an objective method for evaluating the digital watermarking is introduced and used to analysis some algorithms ; 3 ) whereas geometric distortion always influences the restoration of watermark, we advocate to enhance the robustness against geometric distortion by restoring the image which has been distorted by geometric transformation, and a method is designed for estimating the parameters of geometric transformation ; 4 ) based on the conclusion discussed above, and combined with the masking effects of hvs, a novel public meaningful gray - scale image digital watermarking is designed by analysising the characteristics of image gray - scale interpolation and haar wavelet transformation. the experimental results show that the method is indeed powerful ; 5 ) whereas many image digital watermarking schemes, which embed watermark by modifying the values of pixels in spatial domain and transformed domain, are confronted with the conflict between the imperceptibility and robustness, we advocated to use some stable digital characteristics of host image as watermark and a algorithm based on hermite matrix is designed
本文重點對灰度圖象數字水印技術進行研究，主要工作如下： 1 ）鑒于目前數字水印的理論研究比較薄弱的現狀，本文通過分析數字水印的特點，建立了一個數字水印的數學模型，為進一步研究數字水印打下了基礎； 2 ）根據以上建立的模型，通過引入容量和穩健度的概念為數字水印提供了一個客觀評價方法，並對一些數字水印演算法進行了分析； 3 ）為增強數字水印抵抗幾何攻擊的能力，研究了受幾何攻擊的圖象的復原問題，並給出了一個計算圖象幾何變換參數的方法； 4 ）通過分析圖象灰度插值演算法和haar小波變換的特點，結合hvs的掩蔽效應，設計了一個公開的有意義數字水印演算法，實驗結果表明本演算法具有較強的穩健性； 5 ）目前許多水印演算法都是通過在空域或頻域修改象素值的方法嵌入水印的，這種方法面臨著透明性和穩健性的矛盾，為解決這個矛盾，本文提出以圖象的某些穩定的數字特徵為水印的觀點，並結合hermite矩陣的特點設計了相應的水印演算法，實驗結果表明該演算法具有較好的穩健性。1. speech enhancement method based on masking properties of the human auditory system is described. in this paper, a threshold is got through simulating the frequency of human auditory in order to reduce the musical residual noise and the background noise
在閾值法除噪中閾值確定是極為重要的環節，本文模擬人耳聽覺掩蔽效應來確定閾值大小，以有效的掩蔽殘留的音樂噪聲和最大限度的保留語音。Is negative, it is taken as an unsigned value and masked with the appropriate size mask
為負值，則將把它作為無符號的值，並使用相應的大小掩碼進行屏蔽。Compared with the lsb algorithm, the robustness of this algorithm is stronger ; compared with the echo hiding algorithm, the detection watermarking of this algorithm is easier, the calculation is simpler ; compared with the time - domain algorithm based on psychoacoustic masking, the calculation complexity is relatively low, the transparency does not rely on experience value, and the embedding amount is larger
與lsb演算法相比，該演算法具有較強的健壯性;與回聲演算法相比，該演算法檢測水印容易，計算簡單;與基於心理學掩蔽模型時域演算法相比，該演算法計算簡單，透明性不依賴經驗值系數，且嵌入量大。基於振幅比較的數字音頻水印（機密信息）隱藏演算法。分享友人