声学

An adaptive conjugate gradient algorithm based on subband decompsition structure was proposed for acoustic echo cancellation in communication systems.

针对通信系统中的声学回声干扰问题，研究了一种快速收敛和有效的自适应回声抵消算法。

This paper introduces the key technologies used in MP3, such as subband filter, psychoacoustical model and dynamic noise allocation.

对MP3所用到的几个关键技术，如子带滤波、心理声学模型、动态噪声分配等作出简明介绍。

The techniques of subband adaptive filtering are used to design the Acoustic Echo Canceller in this dissertation.

本文利用子带自适应滤波技术进行声学回声消除设计。

The representative large projects included: TV Station of LiaoNing, Broadcast and Television of NingXia, TV Station of ChengDu, TV Station of NanJing, TV Station of ShenYang, Broadcasting station of ShenYang, Broadcasting Station of HuBei, Broadcasting and Televisional centers of QinHuangDao and WuXi, Educational Stations of JiangSu and KunMing, Asia TV City, International Conference Center of ShenYang, The Theatre of LiaoNing, Theatre of The China Century Monument and ShenYang Gym.

其中有代表性的大型工程有：辽宁电视台、宁夏广电中心、成都电视台、南京电视台、沈阳电台、湖北电台、秦皇岛、无锡市广电中心、江苏、昆明教育电视台；亚洲电视城、沈阳国际会展中心、辽宁大戏院、中华世纪坛剧场，沈阳体育场。公司直属机构有设计院，工程公司，声学研究所。

The advent of the acoustic Doppler current profiler made possible the development of a discharge-measurement system capable of more accurately measuring unsteady or tidally affected flow.

随着ADCP(Acoustic Doppler Current Profilers)声学多普勒流速剖面仪的出现，使得更准确的测量不稳定流和受潮汐影响的流量测验系统成为可能。

The results show that stocks of Trichiuridae,Decapterus maruadsi,Trachurus japonicus,Nemipterusand Priacanthidaeare 5.04×10~(5),1.63×10~(5),1.04×10~(5),9.8×10~(4) and 9.2×10~(4) t,respectively,in the north waters of South China Sea.

根据调查资料，运用渔业资源声学评估方法对该海域的带鱼科、蓝圆鲹、竹荚鱼、金线鱼科以及大眼鲷科等5类23种经济鱼类进行了评估与分析。

Due to unaccessible, the sea floor is studied by acoustical and geological methods.

由于人们无法直接接触海底，对其研究绝大多数是事后借助于声学和地质学调查手段进行。

The tidal river discharge observing system of this thesis gives a new method and experience of the hydrology observing to the river reach and cross section with complicated landform and flow, or busy shipping. This system has achieved 3 innovations: instruments for measurements which use the unmechanized rotor and continue measuring ADCP as the velocity mainframe; methods of velocity measurement which change the vertical velocity measurement to horizontal velocity measurement; the tidal discharge measurement which solve the problem that current method of discharge measurement can not achieve the accuracy of the criterion according to the continuous real time observing over the velocity of flow.

本论文研究的感潮河流流量监测系统，具有测验设备的创新，用可连续测验的非机械转子式的声学多普勒流速剖面仪为测速主机；流速测验方式的创新，改变以往测取垂向流速为水平流速的方式；潮流量测验方式的创新，对流速进行连续实时的监测，解决了用现行测流方法达不到规范要求精度的问题；为地形、水流复杂或是航运频繁的测验河段和断面，提供水文监测的新方法、方式和经验。

Objective To probe into the clinical significance of applying acoustic densitometry to diagnosis untypical Kawasaki Disease of acute stage.

摘 要］目的：探讨声学密度定量技术在诊断急性期非典型川崎病中的临床意义。

Methods Subjects were assigned into three groups:34 cases of typical KD,31 cases of untypical KD and 30 cases of healthy children being as control.

摘 要］目的：探讨声学密度定量技术在诊断急性期非典型川崎病中的临床意义。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。