音波定向 的英文怎麼說
中文拼音 [yīnbōdìngxiàng]
音波定向
英文
acoustic orientation-
Conclusion this result shows that that the pinna and concha have almost no effect no sound localization in horizontal plane, which means spectral characteristic does not possihly dominate in horizorntal plane
結論實驗表明耳廓和外耳道對水平方向的聲音定位幾乎無影響，也就是說在水平方向上的聲音定位，耳廓和外耳道的濾波、共振等改變聲波頻譜特性作用可能不明顯。In all kinds of complicated network, oriented linking and unlinking, communication frequency resource is strained, and bandwith to transmitting audio frequency signal is too restricted, complicated and fluky, while audio frequency data exponential have been increased in the last several years. under the circumstances, based on the research of predecessor, this paper studies wavelet analysis ' s maths gist and practices significance on signal process, and puts forward a optimized wavelet package condensation arithmetic to process audio frequency data, which gives attention to coding efficiency, multirate and compression delay. simulation experiment on the arithmetic has been done by matlab
針對無連接和面向連接的各種復雜網路環境下，通信頻帶資源緊張，音頻傳輸帶寬有限且復雜多變，而各種音頻數據又日益增多的局面，本文研究小波分析在信號處理方面的數學依據和在數據壓縮方面的實際意義，在前人不斷工作的基礎上，提出了一種優化小波包變換編碼方案用於音頻數據的壓縮演算法，兼考慮了編碼效率、多碼率和壓縮時延多個方面，並在matlab環境下做了模擬實驗，對各種音頻信號及多種小波函數做了模擬結果比較，實驗結果證明該演算法可以在一定計算復雜度下可以很好地改進壓縮效果，達到多碼率下實現實時編解碼的過程，在高速dsp晶元等硬體設備支持下，可以有效應用於實際復雜多變信源編碼。In actual fact, a suitably modified amateur radio transmitter operating in either the 420 to 450 megahertz band or the 1. 3 gigahertz band, with a highly directional antenna, is capable of transmitting voice to skull signals at less cost than the price of an automobile
事實上，一個適當限制在420到450兆赫波段或1 . 3千兆赫波段的帶有高度定向天線的業余無線電廣播發射機，能夠把聲音信號傳給頭骨並且所花的費用比一輛汽車的價格還要少。But the gps receivers on the air china 757 fix the position of the aircraft to within a few metres as it begins its descent through a long valley, around an awkward ridge and down onto the new runway at linzhi
但是當中國國際航空公司的波音757客機降低飛行高度通過一條危險山脊附近的長長山谷的時候，機上的gps接收器以米的精度鎖定飛機的航向，安全降落在林芝機場的新建跑道上。Firstly, the strain gauge method was used to measure the time difference of stress wave passing through two gauges adhered on the surface of test piece and also their main frequencies secondly, a 3 - component dynamometer was used to measure the resonant frequency of timber six kinds of full size timber were used for test
本研究旨在研發兩種新的應力波計測技術，其一為利用應變規來測定兩標點間之應力波傳遞時間差及試材之共振頻率，藉以計算試材之音速及動彈性系數，其二為利用三向動力計來測定試材之共振頻率。The prototype test results indicate : voltage mode and current mode ac - ac mode ac / ac converters with high frequency link have the advantages such as high frequency electrical isolation. simple topology, two - stage power conversions, high power density, bidirectional power flow, good line current waveform, no audio noise, high converting efficiency, and high input power factor etc. this kind of converter lay the key technical foundation on new type regulated sinusoidal ac power supply, electronic transformer, ac regulator, and wave converter etc
試驗表明，這類變換器具有高頻電氣隔離、電路拓撲簡潔、兩級功率變換（ lfac hfac lfac ） 、功率密度高、雙向功率流、無音頻噪音、變換效率高、網側功率因數高等優點。為新一代正弦交流穩壓器、電子變壓器、交流調壓器、同頻波形變換器的實現奠定了關鍵技術基礎。The main research content of the article is involved as follows : ( 1 ) the research and discussion of the quantitative metallographic analysis methods and the measuring methods of micro hardness. ( 2 ) the application of digital image technique in metallographic image preprocess such as gray level transformation, dichotomy, noise eliminating, dilation and erosion, image enhancement, boundary detection, etc. the application of the wavelet and multi - resolution analysis in metallographic image procession to improve the measuring accuracy and efficiency. the application of the region growth and mathematical morphology in analyzing image parameters to improve the flexibility and exaction
本文的主要研究內容： （ 1 ）定量金相分析和顯微硬度測量的方法研究； （ 2 ）利用數字圖像處理技術，實現金相圖像的灰度轉換、二值化、噪音消除、膨脹收縮、圖像增強、邊緣提取等預處理；引入小波理論、基於數學形態學的區域生長法對采樣圖像進行分析，實現了對採集圖像邊緣的有效提取，從而提高了測量精度； （ 3 ）開發了金相圖像分析系統的主體結構（硬體結構和軟體結構） ； （ 4 ）採用windows開發平臺的面向對象程序設計語言microsoftvisualc + +進行系統的模塊化設計； （ 5 ）提出了採用多模式的知識表示方法建立知識庫，應用正反推理、模糊數學模型、基於規則的模式匹配模型建立金相分析專家系統。Referring to boeing aircraft product data and combining cad / cam and product data technology development, advance the concept of product data of design for manufacturing and the form of product data integration definition facing manufacture, and set up the digital product data system supporting the advanced manufacturing technology from the point of view engineering. 2
參照波音飛機的數字化產品數據定義和描述，結合cad cam技術和產品數據的發展，提出了面向製造的產品數據描述的概念及產品數據的集成定義形式，從工程角度，建立支持先進製造技術和pdm技術的數字化產品數據體系。分享友人