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    • 1. 发明授权
    • Multi-channel audio surround sound from front located loudspeakers
    • 来自前置扬声器的多声道音频环绕声
    • US06937737B2
    • 2005-08-30
    • US10692692
    • 2003-10-27
    • Matthew S. Polk, Jr.
    • Matthew S. Polk, Jr.
    • H04R5/00H04R5/02H04S3/00
    • H04S3/002H04R5/02
    • A surround sound reproduction system uses a series of filters and a system of main and sub-speakers to produce phantom rear surround sound channels or a phantom surround sound effect from a loudspeaker system or pair of loudspeaker systems located in front of the listener. The sound system includes left and right surround input signals, and left and right front input signals. Left and right sub-speakers, and left and right main speakers are located in front of a listening location. Spacing between respective main and sub-speakers is approximately equal to ear spacing for an average person. The input to the left sub-speaker comprises the right surround signal subtracted from the left surround signal each signal having previously passed through a front-to-back filter and a series of high and low pass filters. The input into the left main speaker comprises the left front signal added to the left surround signal after the left surround signal has passed through a front-to-back filter. The input into the right sub-speaker comprises the left surround signal subtracted from the right surround signal each signal having previously passed through a front-to-back filter and a series of high and low pass filters. The input into the right main speaker comprises the right front signal added to the right surround signal after the right surround signal has passed through a front-to-back filter.
    • 环绕立体声再现系统使用一系列滤波器和主扬声器和副扬声器系统来产生幻影后置环绕声道或来自位于收听者前方的扬声器系统或一对扬声器系统的幻影环绕声效果。 声音系统包括左右环绕声输入信号,左右前置输入信号。 左右副扬声器,左右主扬声器位于收听位置前方。 相应的主扬声器和副扬声器之间的间距大致等于一般人的耳朵间距。 左辅助扬声器的输入包括从左环绕信号中减去的每个信号预先通过前后滤波器和一系列高通滤波器和低通滤波器的右环绕信号。 左主扬声器的输入包括在左环绕信号已经通过前后过滤器之后添加到左环绕信号的左前信号。 右辅助扬声器的输入包括从右环绕信号中减去的左环绕信号,每个信号先前已经通过前后滤波器和一系列高通滤波器和低通滤波器。 右侧主扬声器的输入包括在右环绕信号通过前后过滤器之后添加到右环绕信号的右前信号。
    • 3. 发明授权
    • Compact audio reproduction system with large perceived acoustic size and image
    • 紧凑的音频再现系统具有大的感知声音尺寸和图像
    • US07817812B2
    • 2010-10-19
    • US11139611
    • 2005-05-31
    • Matthew S. Polk, Jr.Bradley M. Starobin
    • Matthew S. Polk, Jr.Bradley M. Starobin
    • H04R5/02H04R5/00
    • H04R1/403H04R5/02
    • A compact audio reproduction system for two input signals includes at least four loudspeakers disposed at the vertices of a quadrilateral not more than two feet on any side and such that no two loudspeakers are located at a distance from one another which is less than one-fourth the greatest distance between any two loudspeakers. The two input signals are connected to alternate speakers such that no two loudspeakers at adjacent vertices of the quadrilateral produce the same signal such that a listener at an arbitrary location perceives a sound source larger than the quadrilateral and significant stereo image. The signals received by two loudspeakers located at adjacent vertices may receive signals which are equalized separately from the signals received by the other loudspeakers for the purpose of reducing comb filtering and improving the tolerance of the device to placement near walls and other obstructions. Two loudspeakers may be delayed by a time corresponding to a sound distance at least equal to the shortest distance between two loudspeakers and not greater than the longest distance between two loudspeakers, for the purpose of reducing comb filtering and improving the perception of large sound source size and stereo imaging for listeners at arbitrary locations.
    • 用于两个输入信号的小型音频再现系统包括设置在任何一侧不超过两英尺的四边形顶点处的至少四个扬声器,并且使得没有两个扬声器彼此距离彼此距离小于四分之一 任何两个扬声器之间的距离最大。 两个输入信号连接到备用扬声器,使得在四边形的相邻顶点处没有两个扬声器产生相同的信号,使得任意位置处的收听者感知到比四边形和重要的立体声图像更大的声源。 由位于相邻顶点处的两个扬声器接收的信号可以接收与其他扬声器接收的信号分开均衡的信号,以减少梳状滤波,并改善设备在靠近墙壁和其他障碍物处放置的公差。 两个扬声器可能被延迟一段时间,声音距离至少等于两个扬声器之间的最短距离,并且不大于两个扬声器之间的最长距离,以减少梳状滤波并提高大声源尺寸的感知 并且在任意位置的听众进行立体声成像。
    • 5. 发明授权
    • Enhanced multi-channel audio surround sound from front located loudspeakers
    • 来自前置扬声器的增强型多声道音频环绕声
    • US07231053B2
    • 2007-06-12
    • US11147447
    • 2005-06-08
    • Matthew S. Polk, Jr.
    • Matthew S. Polk, Jr.
    • H04R5/02
    • H04S3/002H04R5/02
    • In a loudspeaker system with main and sub-speakers, a modified and inverted left surround signal is added to the signals driving the right main speaker and a modified and inverted right surround signal is added to the signals driving the Left Main Speaker for the purpose of creating more credible rear located phantom sound images. In a system using variations of a difference signal to create phantom rear located sound images, the components of the difference signal are modified by introducing a time delay to one of the components for the purpose of preventing the components of the difference signal from substantially canceling each other. The components of the difference signal may be modified by altering the relative level and frequency response of the components for the purpose of preventing the components of the difference signal from substantially canceling each other. In a system using variations of the difference signal to create phantom sound images, cost effective means are provided to isolate individual amplifier channels so as to block potentially damaging current flows without degrading performance.
    • 在具有主扬声器和副扬声器的扬声器系统中,在驱动右主扬声器的信号中增加了改进的和反向的左环绕信号,并且将修改和反转的右环绕信号添加到驱动左主扬声器的信号中,以便 创造更可靠的后置幻影声音图像。 在使用差分信号的变化来产生幻影后置声音图像的系统中,通过将时间延迟引入到一个组件来修改差分信号的分量,以防止差分信号的分量基本上消除每个 其他。 可以通过改变组件的相对电平和频率响应来修改差分信号的分量,目的是防止差分信号的分量基本相互抵消。 在使用差分信号的变化来产生幻影声像的系统中,提供了成本有效的方法来隔离各个放大器通道,从而阻止潜在的有害的电流而不降低性能。