acoustic quality design 中文意思是什麼
acoustic quality design
解釋
音質設計-
Jiefu has a strong r d team which organized of state grade acoustic expert, constructs an effective production and quality control system, possesses of denmark loudsoft acoustic design soft and american lms acoustic analysis soft, full set b k2012 acoustic testing system, korea sigma inspect and test system as well as a 520cbm anechoic room, several reliability laboratory and subjective audition room. facilitated by all the above - mentioned resource, jiefus engineers continuously design and create the excellent speaker unit and speaker system
公司憑藉由國家級聲學專家組成的技術研發隊伍，建有一套有效的生產質量控制體系，擁有丹麥loudsoft聲學設計軟體和美國lms聲學分析軟體全套的丹麥b k公司2012電聲測試系統，和韓國sigma測試及試驗系統，並配備有520立方米的消聲室，多個信賴性實驗室和主觀聽音室，通過這些完備的研究開發資源，傑夫工程師不斷設計並生產出優秀的揚聲器單元和系統。 -
It is very difficult to design a high - quality underwater acoustic data transmission system. in our study, we use frequency diversity and frequency - hopped technology. this method is an effective solution for the isi and signal fading
該方法起到保證mfsk傳輸系統使用頻率中文摘要統使雨頻率分集技術能得以有效的實現；並可用於提高mfsk信號檢測精度，因此在頻率信號檢測中它有廣泛應用意義，它是本文重要創新之處。 -
Article 12 when determining the layout of buildings, urban planning departments shall, in accordance with the national standards for acoustic environmental quality and the sound insulation design standards for civil architecture, decide on the rational distance between the structures and the traffic trunk lines in order to keep the structures away form noise as well as the requirements on planning and design accordingly
第十二條城市規劃部門在確定建設布局時，應當依據國家聲環境質量標準和民用建築隔聲設計規范，合理劃定建築物與交通干線的防噪聲距離，並提出相應的規劃設計要求。 -
At present the manufacture of surface acoustic wave use the technology of the final submicron. a series of the devices of low insertion loss, high q saw rayleigh surface acoustic wave resonators or stws that insertion loss has less than 5db, load quality factor ( ql ) is more than 1000 on the quartz piezoelectric with zero of first temperature factor in the research. these difference frequencies are 60mhz, 280mhz, 739mhz and 1ghz of normal frequency and at also surface acoustic wave. using 1. 25db noise factor amplifier, careful design curcuit, good setting printed curcuit board, and using the 1ghz surface transverse wave resonator as frequency element, researching the low phase noise surface acoustic wave with sideband phase noise near ? 120dbc / hz deviating 1khz on carrier, spurious suppress with 80db
本研究採用一階溫度系數為零的壓電石英基片上製作出損耗小於5db 、有載品值因素（ ql值）超過1000的一系列低損耗、高q值聲表面波rayleigh波或stw諧振器，頻率分別為60mhz 、 280mhz 、 739mhz和1ghz等不同頻率的高性能聲表面波諧振器。並採用噪聲系數為1 . 25db的低噪聲系數放大器，精心設計電路，優化設計布置印製電路板，用標稱頻率為1ghz的聲表面波諧振器為頻率控制元件，製作出在偏離載頻1khz處的單邊帶相位噪聲近- 120dbc / hz 、雜波抑制達80db以上的低相位噪聲聲表面波振蕩器。
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