pitch frequency 中文意思是什麼
pitch frequency
解釋
俯仰振動頻率-
An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment
嘯聲干擾一種由於諸如閃電等大氣干擾而產生的音頻電磁波，具有典型的逐漸減弱頻率的特徵，該頻減引起了檢波設備中調逐漸下降的嘯聲 -
The pitch depends on the frequency.
音調的高低是由頻率決定的。 -
Carrying the information of content, it has the function of content verification. this article compares various method of formant parameters calculation, and completes the calculation of the 5 former formant frequencies and bands. as pitch frequency
在分別使用支持向量回歸和多項式回歸進行句子轉換的對比實驗中，支持向量回歸的頻譜更接近目標語音，但其執行速度慢，運算時間較長。 -
In various speech character parameters, formant frequency, bandwidth and pitch frequency are chosen as voice character parameters. the reasons are as follows : hearing apperceive experiments indicates that formant frequency can stand for a majority of voice information, while average pitch frequency can explain 55 % ability of speaker verification
數據結果與多項式回歸和線性多變量回歸相比，支持向量回歸既提高了泛化性能又避免了頻譜不連續性，從而使轉換語音與目標語音的頻譜距離失真分別減少了33 . 29 %和35 . 24 % 。 -
Firstly, we study the construction of emotion - speech template database, and analyze the common features such as pitch, energy and formant. after choosing the useful features by using fuzzy entropy effectiveness analysis, we get better performance with the application of neural network. in addition, we propose some more efficient features such as speech rate, pitch slope, mel - frequency cepstral coefficients and its transient parameters, and design a processing model based on vector quantization for cepstral features to fusing different features
本文首先介紹了情感語音數據庫的建立情況，然後研究了基音頻率、振幅能量和共振峰等目前常用的情感特徵在語音情感識別中的作用，並且通過一種基於模糊熵的特徵有效性分析方法進行了有效特徵的篩選，應用人工神經網路建立了初步的語音情感識別模型，經過實驗發現特徵篩選后系統的識別效果有著一定程度的提高。 -
Because the speech signal is periodicity at sonant which vocal cords surge in low frequency and similarity to white noises at surd, the pitch can be detected in traditional way through the correlation operation without the speech produce model
在人類語音的濁音段，聲帶發生較低頻率的振蕩，語音信號呈明顯的準周期性，而在清音段，語音信號則類似於白噪聲。 -
Simulation experiments show that the pitch extracting results of the algorithm are superior to that of the conventional algorithms, overcoming the random errors and multiple or half frequency errors, especially robust at low snr
模擬實驗表明，該演算法與傳統方法相比其基音檢測結果有明顯的改善，克服了隨機錯誤及倍頻、半頻錯誤，並且在低信噪比下魯棒性較好。 -
Based on research of wind turbine aerodynamic characteristics, this paper analyzed various control methods for a pitch - controlled system of variable - speed and constant - frequency wind turbine at a wind velocity range higher or lower its speed rating respectively
摘要在風力機空氣動力學特性分析的基礎上，討論了變速恆頻風力機組變槳距機構在低於額定風速階段和高於額定風速階段的不同控制策略。 -
The paper studies the pitch - regulated structure and stand - alone control system about mw wind turbine group. the background of the paper is " mw variable - speed constant - frequency wind turbine group ( no. 2001aa512022 ) ", which is supported by national 863 plan
本文以國家863計劃《兆瓦級變速恆頻風電機組》 （課題編號： 2001aa512022 ）為背景，主要研究了兆瓦級風電機組的變槳距機構及其單機控制系統。 -
The characteristics of wind turbine generators as well as features of the fixed pitch wind turbine generator and the variable pitch wind turbine generator are presented, emphasizing on the variable speed constant frequency ( vscf ) generating system based on doubly - fed generators and on the control system for pitch angles
在簡述風力機特性的基礎上，介紹了定槳距和變槳距發電機組的特點，重點分析了基於雙饋發電機的變速恆頻發電系統及槳葉節距角控制系統。 -
The specs in above table, we have different version for different voltage, frequency, pin pitch, wires, spl. . etc
上表中的料號，我們有不同的電壓，頻率，腳距，音壓，焊線. . .可供選擇 -
To effectively change pitch on a valved brass instrument, two things come into play : the pressing of valves to effectively change the length of the tubing, and the player ' s lip aperture or " embouchure " setting, which determines the frequency of the pulsed air or vibrations into the instrument
要在按鍵樂器上改變音高，有兩個方法能夠辦到：一、壓下按鍵改變管子的長度，二、演奏者所吹出的氣流改變嘴唇的振動頻率。 -
Lower pitch indicates a note of lower frequency, following the conventional description of notes with a smaller number of vibrations per second as low, and with a greater number as high
高音即為低振動率的音，根據通用描述，每秒振動次數較少為低，每秒振動的次數多為高。 -
The position errors are measured by two dimension single - frequency laser interferometer, the pitch and yaw errors are tested using phase shifting interferometer with a resolution of 0. 1nm, the linearity along motion axis is investigated by autocollimator with 0. 01 " uncertainty
利用單頻激光干涉儀測試其運動定位誤差特性，相位偏移干涉法測試運動轉角誤差，光電自準儀測試其運動偏擺誤差。 -
A method of pitch mark determination for a speech, includes : acquiring a fundamental frequency point and fundamental frequency passband signals by using an adaptable filter ; detecting a number of passing zero positions of the fundamental frequency passband signals ; and generating at least a set of pitch marks from a number of passing zero positions
一種決定語音音高標記的方法，系藉以找出一語音之一組音高標記，此決定語音音高標記的方法系利用一可適性濾波器取得一基頻點與一基頻帶通訊號；求取基頻帶通訊號之復數個過零點位置；然後經由復數個過零點位置產生至少一組音高標記。 -
For the case of a doppler radar, the faster the raindrops move towards the radar, the higher will be the frequency i. e. pitch of the microwave reflected from raindrops fig. 1
多普勒雷達利用同一原理：雨點移近雷達的速度越快，反射回來的微波頻率即聲調就越高圖1 。 -
This paper makes a detailed discussion on the following key problems of high - frequency vibrating screen as bearing heating, high pitch of noise, and breaking of main bolts and it also provides the reason why those problems happen, improvement plan, and application
摘要就高頻振動篩在使用中軸承發熱、噪聲過高、主螺栓斷裂等關鍵技術問題，詳細論述了問題的產生原因，改進方案和使用效果。 -
The establishment of gear fault data warehouse the paper studies several gear cases in drive lab of wuhan university of science and technology. the signal of normal gear pair, the one has been worn seriously, the one which has circular pitch error and the one whose pinion has a ruptured tooth is acquired independently. after fft transformation, the amplitude values of 0 - 0. 4 multiple engage frequency, 0. 4 - 0. 5 multiple engage frequency, 0. 5 - 1 multiple engage frequency, 1 multiple engage frequency, 2 multiple engage frequency, 3 multiple engage frequency, 4 multiple engage frequency and greater then 4 multiple engage frequency of every signal are obtained respectively
論文主要完成下列內容: 1 .齒輪故障數據倉庫的建立以武漢科技大學傳動實驗室的若干臺齒輪箱為研究對象，分別採集正常齒輪副、磨損嚴重的齒輪副、有周節誤差的齒輪副和小齒輪有一個斷齒的齒輪副的振動加速度信號，經過fft變換，分別得到每個信號的0 ~ 0 . 4倍嚙合頻率、 0 . 4 ~ 0 . 5倍嚙合頻率、 0 . 5 ~ 1倍嚙合頻率、 1倍嚙合頻率、 2倍嚙合頻率、 3倍嚙合頻率、 4倍嚙合頻率和大於4倍嚙合頻率幅值。 -
Second, efficient pitch detection is developed in frequency domain, which find fractional pitch. finally, harmonic phase reconstruction that exploits minimum - phase model is proposed
其次，本文開發了一種高效頻域基音檢測方法，使基音檢測結果精確到分數樣點。 -
First, variable speed constant frequency wind energy convertion theory is described in this paper, then presents a review on the development of wind turbines control and the main types of generator and static converters used to interface variable speed wind turbines to the electric grid. then discuss main circuit constructure and advantage of direct drive wind energy conversion system and introduce pitch - control method for wind power traction and electric power stability. simply aerodynamic characteristic of the turbine is analysised and permanent magnet synchnonous generator math model is established. to convert the variable frequency electricity into utility grid, back to back four - quadrant pwm - vsi is used and three typies of control strategy is presented to capture the maximum wind energy and transmit energy. then simulation is implemented to test the control strategy. in the following chapter a simple ac - dc - ac converter with a dc - dc boosting chopper is proposed to transmit the wind energy into electricity energy and two control strategy is presented
建立了永磁電機和變流器的數學模型，針對雙pwm變頻器的特點提出了三種控制策略對變流器進行控制，通過變流器交-直-交的變換，將發電機發出的變頻變幅值交流電轉化為可用的恆定頻率的交流電，通過pwm調治能使其輸出功率因數為一，並且該控制系統功率因數為可調，能在特殊情況下同電網交換一定的無功功率，並通過對變流器的控制實現了最大風能俘獲的功能。最後採用matlab / simulink進行了模擬，取得了良好的模擬效果。在風力發電系統中，採用先進的最大功率俘獲演算法，能有效的從風中獲得最大的能量。
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