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41. 发明申请

WO1997035300A1 METHOD AND APPARATUS FOR THE ACTIVE CONTROL OF SOUND RADIATED FROM FLOW DUCTS 审中-公开
标题翻译：用于流动导管辐射的主动控制的方法和装置
公开(公告)号：WO1997035300A1
公开(公告)日：1997-09-25
申请号：PCT/GB1997000624
申请日：1997-03-10
申请人： THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND , JOSEPH, Philip , NELSON, Philip, Arthur , FISHER, Michael, John
发明人： THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
IPC分类号： G10K11/178
CPC分类号： G10K11/178 , G10K2210/111 , G10K2210/112 , G10K2210/119 , G10K2210/1281 , G10K2210/3051 , G10K2210/507
摘要： A method for the active control of sound radiated in a duct (1) comprising sensing sound from an array (4) of sensors located on the inside surface of a flow duct and controlling an array (3) of secondary sources (loudspeakers) so as to minimize sound radiated in the far field. This is done by controlling the sound sources so as to minimize a cost function. Depending on whether total sound power or sound power towards the sideline is to be reduced, different cost functions are used by the method.
摘要翻译：一种用于主动控制在管道（1）中辐射的声音的方法，包括从位于流动管道的内表面上的传感器阵列（4）感测声音并且控制次级源（扬声器）阵列（3），以便以最小化在远场辐射的声音。这是通过控制声源来实现的，以便最小化成本函数。取决于是否减少总声功率或声功率，该方法使用不同的成本函数。

42. 发明申请

WO1997030566A1 SOUND RECORDING AND REPRODUCTION SYSTEMS 审中-公开
标题翻译：声音记录和复制系统
公开(公告)号：WO1997030566A1
公开(公告)日：1997-08-21
申请号：PCT/GB1997000415
申请日：1997-02-14
申请人： ADAPTIVE AUDIO LIMITED , NELSON, Philip, Arthur , KIRKEBY, Ole , HAMADA, Hareo
发明人： ADAPTIVE AUDIO LIMITED
IPC分类号： H04S01/00
CPC分类号： H04R5/02 , H04R2205/022 , H04S1/002 , H04S7/302 , H04S2420/01
摘要： With reference to the figure, a sound reproduction system (1) which provides virtual source imaging, comprises loudspeaker means in the form of a pair of loudspeakers (2), and loudspeaker drive means (3) for driving the loudspeakers (2) in response to output signals from a plurality of sound channels (4). The loudspeakers (2) comprise a closely-spaced pair of loudspeakers, the radiated outputs (5) of which are directed towards a listener (6) so as to define a convergent angle theta therewith of between 6 DEG and 20 DEG inclusive and, preferably, about 10 DEG . The loudspeakers (2) are disposed side by side in a contiguous manner within a single cabinet (7). The outputs (5) of the loudspeakers (2) converge at a point (8) between 0.2 metres and 4.0 metres (distance r?0?) from the loudspeakers. The distance DELTA S (span) between the centres of the two loudspeakers (2) is preferably 45.0 cm or less. The loudspeakers drive means (3) comprise a pair of filters with inputs u1 and u2, and outputs v1 and v2. The filters may be designed by employment of least mean squares (LMS) approximation, and be provided with or incorporate cross-talk cancellation means, head related transfer function (HRTF) means and/or modelling delay means.
摘要翻译：参考附图，提供虚拟源成像的声音再现系统（1）包括一对扬声器（2）形式的扬声器装置和用于响应于扬声器（2）驱动的扬声器驱动装置（3）以从多个声道（4）输出信号。扬声器（2）包括紧密间隔的一对扬声器，其辐射输出（5）指向收听者（6），从而将收敛角θ定义在6°和20°之间，并且优选地约10度。扬声器（2）在单个机柜（7）内以连续的方式并排布置。扬声器（2）的输出（5）会聚在距离扬声器0.2米到4.0米（距离r 0 0）之间的点（8）处。两个扬声器（2）的中心之间的距离DELTA S（跨度）优选为45.0cm以下。扬声器驱动装置（3）包括一对具有输入u1和u2的滤波器，并且输出v1和v2。可以通过使用最小均方（LMS）近似来设计滤波器，并且提供或结合串扰消除装置，头部相关传输函数（HRTF）装置和/或建模延迟装置。

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