公开(公告)号：WO2002001916A3

公开(公告)日：2002-01-03

申请号：PCT/GB2001/002759

申请日：2001-06-22

Applicant: ADAPTIVE AUDIO LIMITED ,  NELSON, Philip, Arthur ,  TAKEUCHI, Takashi

Inventor： NELSON, Philip, Arthur ,  TAKEUCHI, Takashi

IPC: H04S3/00

Abstract: A sound reproduction system has pairs of sound emitters that subtend different angles Θ, the span angle, at the listener position. The pairs of sound emitters are arranged to be excited by different frequency bands of the signal output from an inverse means (H h , H l ). The operational span/frequency range of the pairs of sound emitters is determined by equation (I) where transducer span Θ is the angle subtended at the listener by a pair of transducers, where 0 n 0 is the speed of sound, and Δ is the equivalent distance between the ears. The sound emitters may be discrete speaker units, the differnt pairs of units being positioned at different span angles, or they may be constituted by area portions of an extended transducer (Fig. 10). When discrete speaker units are employed a cross-over filter (Fig.28) is used to provide drive signals in the different frequency bands to the different speaker pairs.

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

Applicant: 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

Inventor： THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/111 ,  G10K2210/112 ,  G10K2210/119 ,  G10K2210/1281 ,  G10K2210/3051 ,  G10K2210/507

Abstract: 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.

Abstract translation: 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。

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

Applicant: ADAPTIVE AUDIO LIMITED ,  NELSON, Philip, Arthur ,  KIRKEBY, Ole ,  HAMADA, Hareo

Inventor： ADAPTIVE AUDIO LIMITED

IPC: H04S01/00

CPC classification number: H04R5/02 ,  H04R2205/022 ,  H04S1/002 ,  H04S7/302 ,  H04S2420/01

Abstract: 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.

Abstract translation: 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。