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1. 发明申请

WO1990000851A1 IMPROVEMENTS IN OR RELATING TO SOUND REPRODUCTION SYSTEMS 审中-公开
标题翻译：声音再生系统的改进或相关
公开(公告)号：WO1990000851A1
公开(公告)日：1990-01-25
申请号：PCT/GB1989000773
申请日：1989-07-07
申请人： ADAPTIVE CONTROL LIMITED , NELSON, Philip, Arthur , ELLIOTT, Stephen, John , STOTHERS, Ian, McGregor
发明人： ADAPTIVE CONTROL LIMITED
IPC分类号： H04S01/00
CPC分类号： H03G5/005 , H03G5/165 , H04S1/002 , H04S3/00
摘要： A stereophonic sound reproduction system is aimed at synthesizing at a multiplicity of points (L) in the listening space an auditory effect obtaining at corresponding points (K) in the recording space, to compensate for crosstalk (C21, C12) between the loudspeakers, the acoustic response of the listening space, and imperfections in the frequency response of the speaker channels. Each speaker channel incorporates a digital filter (H) the characteristics of which are ajusted in response to measurements of the reproduced field. The digital filters are provided by an inverse filter matrix (H) of which the matrix elements (Hij) are determined by a least squares technique, applied so as to minimise the sum of the squared errors resulting from the difference between the actual system impulse response and a desired impulse response. A full bandwidth signal is transmitted by a bypass route for combination with the output signal (9) from the filter, the bypass route including a delay means (F).
摘要翻译：立体声再现系统的目的在于在收听空间中的多个点（L）处合成在记录空间中的相应点（K）获得的听觉效果，以补偿扬声器之间的串扰（C21，C12），收听空间的声响应以及扬声器通道频率响应的不完善。每个扬声器通道包括数字滤波器（H），其特性是响应于再现场的测量而调整的。数字滤波器由反滤波器矩阵（H）提供，其中矩阵元素（Hij）由最小二乘法确定，以便最小化由实际系统脉冲响应之间的差异导致的平方误差之和和期望的脉冲响应。通过旁路路由与来自滤波器的输出信号（9）组合的全带宽信号，旁路路径包括延迟装置（F）。

2. 发明申请

WO1990001861A1 IMPROVEMENTS IN OR RELATING TO REDUCING THE STRENGTH OF ELECTRO-MAGNETIC FIELDS 审中-公开
标题翻译：改善或减少电磁场的强度
公开(公告)号：WO1990001861A1
公开(公告)日：1990-02-22
申请号：PCT/GB1989000865
申请日：1989-07-28
申请人： ADAPTIVE CONTROL LIMITED , ELLIOTT, Stephen, John
发明人： ADAPTIVE CONTROL LIMITED
IPC分类号： H05K09/00
CPC分类号： G01R33/421 , H05K9/00
摘要： Apparatus (2) (see Figure 3) for reducing the strength, within a room C, of the magnetic component of an electro-magnetic field, comprises means for creating a second, controlled, magnetic field component which interferes with the first mentioned magnetic field component so as to reduce the strength thereof. The means (2) comprise a plurality of induction winding means (d1, d2, d3) and a plurality of controlling magnetic field sensors (f1, f2, f3, f4), the number of sensors (f1, f2, f3, f4) being greater than the number of winding means (d1, d2, d3). The winding means (d1, d2, d3) encompass the room C about three Cartesian co-ordinate axes (X, Y, Z). Similar apparatus (20) (see Figure 4) is provided for reducing the strength of the electrical component of the electro-magnetic field wherein, inter alia, the windings (d1, d2, d3) are replaced by large area capacitor plates.
摘要翻译：用于降低电场的磁性部件的室内强度的装置（2）（见图3）包括用于产生第二受控的磁场分量的装置，该第二受控的磁场分量干扰第一提到的磁场从而降低其强度。装置（2）包括多个感应卷绕装置（d1，d2，d3）和多个控制磁场传感器（f1，f2，f3，f4），传感器数量（f1，f2，f3，f4）大于卷绕装置的数量（d1，d2，d3）。卷绕装置（d1，d2，d3）围绕三个笛卡尔坐标轴（X，Y，Z）包围房间C. 提供了类似的装置（20）（参见图4），用于降低电磁场的电气部件的强度，其中特别地，绕组（d1，d2，d3）被大面积的电容器板代替。

3. 发明申请

WO1988002912A1 ACTIVE VIBRATION CONTROL 审中-公开
标题翻译：主动振动控制
公开(公告)号：WO1988002912A1
公开(公告)日：1988-04-21
申请号：PCT/GB1987000706
申请日：1987-10-06
申请人： ADAPTIVE CONTROL LIMITED , ELLIOTT, Stephen, John , NELSON, Philip, Arthur , STOTHERS, Ian, McGregor
发明人： ADAPTIVE CONTROL LIMITED
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K2210/1282 , G10K2210/30232 , G10K2210/3032 , G10K2210/3046 , G10K2210/3048 , G10K2210/3049 , G10K2210/3212
摘要： To reduce noise inside a motor car passenger compartment, two loudspeakers (371, 372) are driven by signals derived from a reference signal x(n) by adaptive filtering carried out by a programmed microprocessor and memory unit (36) which adapts the filtering in dependence on error signals el(n) from four microphones (421, 422, 423 and 424) distributed in the passenger compartment. Reference filtering coefficients are initially determined by analysis of finite impulse responses when white noise is acoustically coupled from the loudspeakers (37) to the microphones (42), a white noise generator (48) being coupled to the unit (36). The reference signal x(n) is restricted to one or more selected harmonics or subharmonics of the fundamental noise frequency by a filter (34) which tracks the selected frequency. The selected frequency may be obtained from a coil (31) in the ignition circuit of the vehicle.
摘要翻译：为了减少机动车乘客舱内的噪音，通过由编程的微处理器和存储器单元（36）执行的自适应滤波，由参考信号x（n）导出的信号驱动两个扬声器（371,372），所述微处理器和存储单元（36）依赖于分配在乘客舱中的四个麦克风（421,422,423和424）的误差信号el（n）。参考滤波系数最初通过分析白噪声从扬声器（37）与麦克风（42）声学耦合的有限脉冲响应来确定，白噪声发生器（48）耦合到单元（36）。参考信号x（n）通过跟踪所选择的频率的滤波器（34）被限制为基本噪声频率的一个或多个选定的谐波或次谐波。选择的频率可以从车辆的点火电路中的线圈（31）获得。

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