公开(公告)号：US6031921A

公开(公告)日：2000-02-29

申请号：US39743

申请日：1998-03-16

Applicant: Akio Mizoguchi

Inventor： Akio Mizoguchi

IPC: H04R1/40 ,  H04R1/02 ,  H04R1/22 ,  H04R25/00

CPC classification number: H04R1/227 ,  H04R1/02

Abstract: A loudspeaker unit comprises a loudspeaker box, a first loudspeaker attached to a front panel of the loudspeaker box, and a second loudspeaker having the same diameter as that of the first loudspeaker and attached to an upper panel of the loudspeaker box. The first loudspeaker is driven in a positive polarity and the second loudspeaker is driven in a negative polarity. Driving voltages E1 and -E2 respectively for driving the first and the second loudspeaker are optional voltages meeting E2/E1

Abstract translation: 扬声器单元包括扬声器箱，附接到扬声器箱的前面板的第一扬声器和具有与第一扬声器的直径相同的直径的第二扬声器，并附接到扬声器箱的上面板。 第一扬声器以正极性驱动，第二扬声器被驱动为负极性。 用于驱动第一和第二扬声器的驱动电压E1和-E2是满足E2 / E1 <1的可选电压。 由第二扬声器辐射的声音的声压低于由第一扬声器辐射的声音的声压。 第一和第二扬声器在相对于90°方向的声音接收位置处的合成声压的方向性因子等于扬声器的方向性因数D（90°）与值（1 - alpha）小于1。 因此，无论频率如何，可以减小扬声器的输出声压。

公开(公告)号：US06665412B1

公开(公告)日：2003-12-16

申请号：US09341454

申请日：1999-08-23

Applicant: Akio Mizoguchi

Inventor： Akio Mizoguchi

IPC: H04R102

CPC classification number: H04R1/347 ,  H04R1/26 ,  H04R5/02

Abstract: The present invention relates to a speaker device or the like capable of stably providing desired directivity provided by a combination of omnidirectionality and bidirectionality down to ultra low frequencies. A speaker (22) is attached to one end face of a speaker box (21) and a sound wave radiation port (23) in a circular shape covered with acoustic resistance material (24) is installed at other end face thereof. The sound wave radiation port (23) is for radiating air vibration produced by a rear face of a speaker diaphragm to outside as sound wave and an axis penetrating the center extends in a direction of a principal axis (reference axis) of the speaker (22). A low pass filter is constituted by acoustic resistance and acoustic mass of the sound wave radiation port (23) and acoustic mass provided by air in the speaker box and a directivity is provided by utilizing group delay time in a pass band of sound wave radiated from the sound wave radiation port (23) via the low pass filter. The desired directivity can stably be provided down to ultra low frequencies by setting arbitrary group delay time regardless of dimensions or shape of the speaker box (21). By utilizing the directivity, a difference in sound pressure levels based on a difference in attenuation of sound in distances to two left and right channels is corrected and a listening range providing excellent stereophonic feeling can be enlarged.

Abstract translation: 本发明涉及能够稳定地提供由全向性和双向性的组合提供的期望方向性到低频的扬声器装置等。 在扬声器箱（21）的一个端面上安装有扬声器（22），在其另一端面安装有由声阻材料（24）覆盖的圆形的声波辐射口（23）。 声波辐射端口（23）用于将由扬声器振膜的后表面产生的空气振动辐射到外部作为声波，穿过中心的轴沿扬声器（22）的主轴（基准轴）的方向延伸 ）。 低通滤波器由声波辐射端口（23）的声阻和声音质量以及由扬声箱中的空气提供的声质构成，并且通过利用辐射的声波通带中的群延迟时间来提供方向性 声波辐射端口（23）经由低通滤波器。 无论扬声器盒（21）的尺寸或形状如何，通过设定任意组延迟时间，可以将所需的方向性稳定地提供到超低频。 通过利用方向性，校正基于距离到两个左右声道的声音的衰减差的声压级的差异，并且可以扩大提供极好的立体声的聆听范围。