frequency analysis 中文意思是什麼
frequency analysis
解釋
頻次分析-
At the same time according to the low recognition rate in speech recognition system, the author used the method of fundamental frequency analysis to build male / female recognition model respectively
同時針對語音識別系統中識別率不高的問題，採用基音頻率分析的方法分別建造男女聲識別模型。 -
The other research purpose is to discover characteristic information and reliable methods of reflecting spinal cord damage. due to typical damage indicators, amplitude and latent period, have bugs such as limited information and weak stabilities, this project recommends applying time - frequency analysis to monitoring spinal cord function. through analysing and comparing typical signal with stft and cwt, it is proved indicators under time - frequency distribution can be better in reflecting signal changes, espcially the wavelet transformation
針對目前ep監測中判定脊髓損傷的指標（波幅和潛伏期）存在信息量相對較小、穩定性較差的缺陷，本課題提出利用時頻分析技術對術中脊髓功能監護進行研究，通過短時傅立葉變換和小波變換分析和比較典型信號的時頻分佈，證明時頻特徵參數能更有效的提取信號的變化信息。 -
Resonance frequency analysis and solution of the electronic belt weigher
電子皮帶秤的共振頻率分析及解決方法 -
Standard test method for impedance and absorption of acoustical materials using a tube, two microphones, and a digital frequency analysis system
管子雙擴音器和數字頻率分析系統用傳聲材料的阻抗和吸收的試驗方法 -
Secondly, the wavelet transform of ae signals collected in experiment is carried out with db6 wavelet and scale 3 on the basis of the signal ' s frequency analysis. the high frequency d, signal is ae characteristic signal. and by choosing the level ' s wavelet coefficient as its input, the wavelet - neural networks can be trained with the data of ae experiment, and the ae signals can be effectively recognized
然後，在實驗與對實驗所採集數據頻譜分析基礎上，根據對小波分析用於信號處理可行性研究，本文選擇db6母小波、尺度j = 3對實驗所採集數據信號進行小波變換，變換后其高頻成分d _ 1信號即為聲發射特徵信號。 -
Chapter 1 introduces the extensive application of hf / vhf communication and hf / vhf radios in military field, and points out the significance for promoting the research work of fh communication countermeasure using modern signal processing techniques, especially time - frequency analysis
第一章介紹了短波通信和短波跳頻電臺在軍事領域中的廣泛應用，以及現代信號處理技術特別是時頻分析技術對促進跳頻通信對抗研究的重要意義。 -
The signal process function of the software include these function : digital filter, windowing, auto - correlation function and cross - correlation function, mean and variance, probability density function and probability distribution function statistic ; auto - power spectrum, cross - power spectrum, frequency response function, coherence function, cepstrum analysis based on fft ( fast fourier transfer ) ; joint time - frequency analysis based on stft ( short - time fourier transfer )
軟體的處理功能包括：數字濾波、時域加窗、自相關與互相關處理、均值和方差計算、概率密度和概率分佈函數計算；在快速傅立葉變換（ fft ）基礎上計算自功率譜、互功率譜、頻率響應函數、相干函數、倒頻譜分析；基於短時傅立葉變換（ stft ）的聯合時頻分析等。 -
It makes the deduction on design tidal level process more reasonable than ever. finally, taking into account the observed data of tidal level are much more integrated than observed data of tidal discharge and the correlative relationship are established based on large numbers of samples. then, the sub stage maximum tidal discharges and tidal velocities are obtained according to the regressive equations and the observed tidal level, and the sub stage design maximum tidal discharges and tidal velocities are estimated by way of frequency analysis
最後，針對橋位河段實測潮流資料短缺而潮位資料相對完整的實際情況，基於大量樣本建立了潮流量與潮汐要素的相關關系，利用實測長系列潮位資料得到分期最大潮流量、潮流速系列，經頻率分析確定了分期設計最大潮流量、潮流速。 -
Relationship between the gyro ’ s bandwidth and sensitivity and the resonant frequency differential ratio is derived through frequency analysis. the bandwidth of the gyro increases as the resonant frequency differential ratio increases ; but the sensitivity decreases as the resonant frequency differential ratio increases
增大驅動軸和敏感軸之間諧振頻率的頻差，可以增加微陀螺的帶寬，但是降低了微陀螺的靈敏度，這為設計石英音叉結構參數時，確定驅動軸和敏感軸諧振頻率提供了指導依據。 -
Thirdly, in the environment of labview, several kinds of vis used for sensor signal test are designed, including wave generation, time domain measurement, filter disposal, frequency analysis, etc. after that, wavelet analysis in the application of one - dimensional signal de - noise is studied, threshold and translation invariance wavelet de - noise are realized, and wavelet de - noise vi for zero drift signal of the fiber optic gyro in fcs is designed using labview
接著，在labview環境下開發了多種用於傳感器信號測試的虛擬儀器，具有波形發生、時域測量、濾波處理、頻譜分析等多種功能。隨后，研究了小波分析在一維信號消噪中的應用，實現了labview環境下的閾值法和平移不變量法小波消噪，並利用labview設計了飛控系統中光纖陀螺零漂信號的小波消噪儀。 -
In this thesis, the theories of joint time frequency analysis and image processing are combined, and a new fbp method called stf is proposed. the characteristics of digital and application are investigated for stf
本文根據顫振試驗的原理和觀測信號特點，綜合運用聯合時頻分析和圖像邊緣識別理論，提出了一種顫振邊界預測的新概念? ?時頻共振（ stf ） ，並完成了stf方法和演算法的研究。 -
The method of applying frequency analysis theory is proposed to resolve the problem of ship motion. the mathematic models of ship - based missile in launch period are established. these models consist of relative motion in launch - fixed coordinate and absolute motion in earth - fixed coordinate
採用了動靜法的描述形式建立了艦載導彈在發射段的數學模型，分別給出了導彈相對發射坐標系的相對運動模型和導彈在地面坐標系下的絕對運動模型。 -
Wavelet analysis is a tool of time - frequency analysis after fourier analysis
小波分析是繼fourier分析之後的新的時頻域分析工具。 -
In this paper. we first introduce the basic concept of time - frequency analysis, include short - time fourier analysis
本文首先介紹了時頻發展的基本概念和比較成熟的時頻分析方法? ?短時fourier分析。 -
The fh signal is a kind of non - stationary signal that the frequency changes non - linearly along with the time. however, the time - frequency analysis technique is the powerful tool to deal with these signals
跳頻信號是一種頻率隨時間非線性變化的非平穩信號，而時-頻分析是分析這類信號的有力工具。 -
The frequency analysis of the psychoacoustic model can give the inaudible, redundan elements of audio. in this paper we employ it to guarantee the inaudibility of the embedded watermark
心理聲學模型的時頻域分析主要用於音頻數據的壓縮編碼，這里主要考慮將其用於音頻水印演算法中去，以便從理論的角度來考慮嵌入水印的不可感知性。 -
Linear time - frequency analysis and its application in weak signal detection
線性時頻分析在弱信號檢測中的應用 -
So they can not be used in on - line fault detection and condition monitoring. and the explanation of the time - frequency analysis is not easily accepted by the engineers. the experimental factors, such as rotational speed and measured position and fault distribution a
文中還針對轉速、測點位置、故障分佈（位置） 、負載等因素對頻譜分析、包絡分析、時延相關解調等方法的診斷效果進行了大量的實驗研究。 -
The frequency analysis of area - averaged ssta time series in key regions indicates that the power spectrum peaks is centered at 2 - 4yr annual oscillation, and there is also long temporal scale oscillation such as quasi decadal oscillation revealed by wavelet analysis
時頻分析表明，這兩個海區區域平均的ssta時間序列存在顯著的2 - 4年年際振蕩以及準年代際變化。自相關分析表明西風漂流區與熱帶中東太平洋ssta在冬季的持續性較好。 -
Time - frequency analysis of the first heart sound based on the hilbert - huang transform
變換的第一心音信號時頻分析
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