公开(公告)号：US20050157890A1

公开(公告)日：2005-07-21

申请号：US10846419

申请日：2004-05-14

申请人： Tatsumi Nakajima ,  Kazunori Suzuki

发明人： Tatsumi Nakajima ,  Kazunori Suzuki

IPC分类号： E01F8/00 ,  G10K11/178 ,  H04R3/00

CPC分类号： G10K11/178

摘要： The present invention provides an active control type noise reducing device that is disposed at a sound barrier and with which can be obtained an excellent noise reduction effect with respect to moving sound sources. Linear array of flat loudspeakers are arranged in ascending order from an incoming side of automobiles towards an outgoing side. Delay times of 0, τ, 2τ, . . . , 8τ are respectively given in the arrangement order to the linear array of flat loudspeakers. By delaying signals in correspondence to the arrangement order, the wavefront of a control sound can be slanted in a diagonal direction. Namely, “line sound sources”, where sound sources are linearly arranged, arc pseudo-realized.

摘要翻译： 本发明提供了一种主动控制型降噪装置，其被设置在声屏障上，并且能够获得相对于移动声源的优异的降噪效果。 扁平扬声器的线性阵列以从汽车的进入侧向外侧的升序排列。 延迟时间为0，tau，2tau。 。 。 ，8tau分别以平面扬声器的线性阵列的排列顺序给出。 通过相对于排列顺序延迟信号，控制声音的波前可以沿对角线方向倾斜。 也就是说，声源线性排列的“线声源”被弧形伪实现。

公开(公告)号：US07492911B2

公开(公告)日：2009-02-17

申请号：US10846419

申请日：2004-05-14

申请人： Tatsumi Nakajima ,  Kazunori Suzuki

发明人： Tatsumi Nakajima ,  Kazunori Suzuki

IPC分类号： H04R3/02 ,  H04R3/00 ,  H04B15/00 ,  A61F11/06

CPC分类号： G10K11/178

摘要： The present invention provides an active control type noise reducing device that is disposed at a sound barrier and with which can be obtained an excellent noise reduction effect with respect to moving sound sources. Linear array of flat loudspeakers are arranged in ascending order from an incoming side of automobiles towards an outgoing side. Delay times of 0, τ, 2τ, . . . , 8τ are respectively given in the arrangement order to the linear array of flat loudspeakers. By delaying signals in correspondence to the arrangement order, the wavefront of a control sound can be slanted in a diagonal direction. Namely, “line sound sources”, where sound sources are linearly arranged, arc pseudo-realized.

摘要翻译： 本发明提供一种主动控制型降噪装置，其设置在声屏障上，并且可以获得相对于移动声源的优异的降噪效果。 扁平扬声器的线性阵列以从汽车的进入侧向外侧的升序排列。 延迟时间为0，tau，2tau。 。 。 ，8tau分别以平面扬声器的线性阵列的排列顺序给出。 通过相对于排列顺序延迟信号，控制声音的波前可以沿对角线方向倾斜。 也就是说，声源线性排列的“线声源”被弧形伪实现。

公开(公告)号：US20090041258A1

公开(公告)日：2009-02-12

申请号：US11794994

申请日：2004-11-12

申请人： Tatsumi Nakajima

发明人： Tatsumi Nakajima

IPC分类号： G10K11/16 ,  G10K11/178

CPC分类号： G10K11/178 ,  G10K2210/12 ,  G10K2210/124

摘要： Effective reduction is made of direct sound or diffracted sound of a noise propagating from plural directions. Three microphones (18k−1, 18k, 18k+1) are disposed and: noise is detected by each of the microphones; delay signals are generated by delaying plural times a signal that has been output from 2 of the microphones (18k−1, 18k+1); the output signal from the remaining microphone (18k) is added to 2 of the delayed signals and input to respective speakers of a speaker unit; a control sound is output from the speaker unit in 3 directions (L, C, R); and reduction is made of direct sound or diffracted sound of a noise propagating from each of the directions.

摘要翻译： 有效地减少从多个方向传播的噪声的直接声音或衍射声音。 设置三个麦克风（18k-1,18k，18k + 1），并且每个麦克风检测到噪声; 通过延迟从麦克风（18k-1,88 + 1）中的2个输出的信号多次产生延迟信号。 来自剩余麦克风（18k）的输出信号被加到延迟信号的2个并输入到扬声器单元的相应扬声器; 从扬声器单元在三个方向（L，C，R）输出控制声音; 并且从每个方向传播的噪声的直接声音或衍射声减少。