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    • 1. 发明授权
    • Pseudo stereophonic device
    • 伪立体声装置
    • US06816597B1
    • 2004-11-09
    • US09581532
    • 2000-08-31
    • Seiji Kawano
    • Seiji Kawano
    • H04R500
    • H04R5/00H04S5/00
    • In a pseudo stereophonic device for producing a pseudo stereophonic signal from a monophonic signal, there are provided m delay units connected in series and gradually delaying an input signal S, m FIR digital filters for respectively subjecting output signals Sk (k=1, 2, . . . m) of the delay units to filter processing, and an operating circuit for executing a predetermined operation on the basis of outputs Yk (k=1, 2, . . . m) of the respective FIR digital filters, to produce pseudo stereophonic signals LOUT and ROUT.
    • 在用于从单声道信号产生伪立体声信号的伪立体声装置中,提供串联连接的m个延迟单元,并逐渐延迟输入信号S,m FIR数字滤波器,用于分别使输出信号Sk(k = 1,2, ... m)和用于根据各个FIR数字滤波器的输出Y k(k = 1,2,...,m)执行预定操作的操作电路,以产生伪 立体声信号LOUT和ROUT。
    • 3. 发明授权
    • Sound signal mixing
    • 声音混合
    • US06721425B1
    • 2004-04-13
    • US09122988
    • 1998-07-27
    • J. Richard Aylward
    • J. Richard Aylward
    • H04R500
    • H04S3/02
    • A method of down mixing a plurality of signals including at least a left surround signal, a right surround signal, a left signal and a right signal into a stereophonic pair that is a left transmitted signal and a right transmitted signal includes summing the left surround and right surround signals to provide a monophonic surround signal, filtering the monophonic surround signal to provide a filtered monophonic signal having properties related to the diffraction pattern around the head of a listener, multiplying the filtered monophonic surround signal with a right coefficient signal related to the ratio of the magnitude of the right surround signal to the sum of the magnitudes of the left surround signal and the right surround signal to provide a left product signal and multiplying the filtered monophonic surround signal with a left coefficient signal related to the ratio of the magnitude of the left surround signal to the sum of the magnitudes of the left surround signal and the right surround signal to provide a right product signal, combining signals related to the left product signal and the left front signal to provide the left transmitted signal, and combining signals related to the right product signal and the right front signal to provide the right transmitted signal.
    • 将包括至少左环绕信号,右环绕信号,左信号和右信号的多个信号下混合到作为左发送信号和右发送信号的立体声对中的方法包括将左环绕和 右环绕信号以提供单声道环绕信号,对单声道环绕信号进行滤波以提供具有与收听者头部周围的衍射图案相关的特性的滤波单声道信号,将滤波的单声道环绕信号与与该比例相关的右系数信号相乘 右环绕声信号的大小与左环绕信号和右环绕信号的大小的和之和,以提供左乘积信号,并将滤波的单声道环绕信号与与左声道环绕信号的幅度的比值相关的左系数信号相乘 左环绕声信号与左环绕声信号和右声道的幅度之和 环绕信号以提供正确的产品信号,组合与左产品信号和左前信号相关的信号以提供左发送信号,以及组合与右产品信号和右前信号相关的信号以提供正确的发送信号。
    • 5. 发明授权
    • Centralizing of a spatially expanded stereophonic audio image
    • 集中空间扩展的立体声音频图像
    • US06711265B1
    • 2004-03-23
    • US10009141
    • 2001-10-24
    • Robert Edward Morris, Jr.
    • Robert Edward Morris, Jr.
    • H04R500
    • H04S1/002
    • In a stereophonic system having sum and difference signals with expanded spatial imaging, localization of center audio materials more towards the center is accomplished by equalization of the (L+R) sum signal. The equalization comprises decreasing the bass response while increasing the treble response of the sum signal with the desired bass reduction being accomplished by the use of a gyrator to economically synthesize an inductance. Additionally, the equalizations in the (L+R) sum signal to reduce the signal at bass frequencies and to increase the signal at treble frequencies are switchable singly or in combination between “ON” and “OFF” modes.
    • 在具有扩展空间成像的和信号和差分信号的立体声系统中,通过(L + R)和信号的均衡来实现中心音频材料对中心的定位。 均衡包括降低低音响应,同时通过使用回转器来经济地合成电感来实现所希望的低音降低的和信号的高音响应。 此外,(L + R)和信号中的低音频率信号和增加高频信号的均衡可以单独切换或者在“ON”和“OFF”模式之间组合。
    • 6. 发明授权
    • 5-2-5 matrix encoder and decoder system
    • 5-2-5矩阵编码器和解码器系统
    • US06697491B1
    • 2004-02-24
    • US09146442
    • 1998-09-03
    • David H. Griesinger
    • David H. Griesinger
    • H04R500
    • H04S3/02H04S7/307H04S2400/05H04S2420/01
    • A sound reproduction system has been developed, for converting signals on two input channels into surround signals on five or seven output channels and vice-versa. A decoder is included which enhances the correlated component of the input signals in the desired direction and reduces the strength of such signals in channels not associated with the encoded direction, while preserving the apparent loudness of all output channels, the separation between the respective left and right output channels and the total energy of the uncorrelated component of the input channels in each output channel. Included within the decoder is a uniquely defined matrix that helps to ensure that the surface of the output signals is smooth and continuous. An encoder is also included which encodes five or seven channels of sound into two so the two channels may be decoded by a variety of decoders with the correct sound direction and level.
    • 已经开发了一种声音再现系统,用于将两个输入通道上的信号转换成五个或七个输出通道的环绕信号,反之亦然。 包括一个解码器,其增强输入信号在期望方向上的相关分量,并且减少与编码方向无关的通道中的这种信号的强度,同时保持所有输出通道的明显响度, 右输出通道和每个输出通道中输入通道的不相关分量的总能量。 解码器中包含的唯一定义的矩阵有助于确保输出信号的表面平滑和连续。 还包括编码器,其将5或7声道的声音编码为2,因此可以通过具有正确声音方向和电平的各种解码器对两个声道进行解码。
    • 7. 发明授权
    • Wavelet conversion of 3-D audio signals
    • 3-D音频信号的小波变换
    • US06628787B1
    • 2003-09-30
    • US09283014
    • 1999-03-31
    • David Stanley McGrathAdam Richard McKeag
    • David Stanley McGrathAdam Richard McKeag
    • H04R500
    • H04S3/02H04S2420/11
    • An improved method and apparatus for creating multi-channel (or binaural) signals from a B-format sound-field source is disclosed. The method allows the encoded spatial format (B-format) to be separated into multiple bands, with each band assigned a short-term direction factor, from which the higher-resolution multi-channel (or binaural) output signals may be determined. The direction factor is determined, for each filter band, based on the short-term statistics of the soundfield signals in those bands. Based on this direction factor, the speaker drive signals are computed for each band by panning the signals to drive the nearest speakers. In addition, residual signal components are apportioned to the speaker signals by means of previously known decoding techniques.
    • 公开了一种用于从B格式的声场源产生多声道(或双耳)信号的改进的方法和装置。 该方法允许将编码的空间格式(B格式)分离成多个频带,每个频带分配短期方向因子,可以从其中确定更高分辨率的多声道(或双耳)输出信号。 对于每个滤波器频带,基于这些频带中的声场信号的短期统计来确定方向因子。 基于该方向因素,通过平移信号来驱动最近的扬声器,为每个频带计算扬声器驱动信号。 此外,残留信号分量通过先前已知的解码技术分配给扬声器信号。
    • 9. 发明授权
    • System for improving a spatial effect of stereo sound or encoded sound
    • 用于改善立体声或编码声音的空间效果的系统
    • US06587565B1
    • 2003-07-01
    • US08944211
    • 1997-10-06
    • Pyung Choi
    • Pyung Choi
    • H04R500
    • H04S1/002
    • A system for improving a spatial effect of stereo sound or encoded sound when producing three dimensional image sound signals from signals of stereo channel includes a spatial effect enhancing portion where a signal for enhancing spatial effect and directivity of sound is produced, a band enhancing portion where a signal for enhancing a signal component of the stereo channel signal in a low frequency range and for maintaining the signal component in a middle frequency range is generated, and a matrix portion where the output signal of the spatial effect enhancing portion, the output signal of the band enhancing portion and the stereo channel signal are calculated in a matrix manner, so that the spatial effect of sound is improved using a differential component between left and right side channel signals. According to the invention, the spatial effect of sound can be improved without using a complicated circuit construction, the deterioration of S/N ratio is prevented, and the cost performance for realizing a spatial effect of sound is remarkably improved.
    • 一种用于在从立体声通道的信号产生三维图像声音信号时改善立体声或编码声音的空间效果的系统包括空间效果增强部分,其中产生用于增强空间效果和声音指向性的信号,频带增强部分, 产生用于在低频范围内增强立体声声道信号的信号分量并将信号分量维持在中频范围的信号,以及矩阵部分,其中空间效果增强部分的输​​出信号, 以矩阵方式计算频带增强部分和立体声信道信号,从而使用左右声道信号之间的差分分量改善声音的空间效果。 根据本发明,可以在不使用复杂的电路结构的情况下改善声音的空间效果,防止S / N比的劣化,并且显着提高用于实现声音的空间效果的成本性能。
    • 10. 发明授权
    • Method of synthesizing a three dimensional sound-field
    • 合成三维声场的方法
    • US06577736B1
    • 2003-06-10
    • US09332601
    • 1999-06-14
    • Richard David Clemow
    • Richard David Clemow
    • H04R500
    • H04R5/02H04R5/027H04S5/00H04S5/02H04S2420/01
    • A method of synthesizing a three dimensional sound-field using a pair of front and a pair of rear loudspeakers, including: a) determining the desired position of a sound source; b) providing a binaural pair of signals corresponding to the sound source using an HRTF filter; c) providing the left signal of said binaural pair of signals to both the left front and left rear loudspeakers through a front and a rear gain control means respectively; d) providing the right signal of said binaural pair of signals to both the right front and right rear loudspeakers through a front and a rear gain control means respectively; e) controlling the ratio of the front signal gains to the rear signal gains as a function of the azimuth angle of the sound source; and f) performing transaural crosstalk cancellation on the front and rear signal pairs through respective transaural crosstalk cancellation means.
    • 一种使用一对前置扬声器和一对后置扬声器来合成三维声场的方法,包括:a)确定声源的期望位置; b)使用HRTF滤波器提供对应于声源的双耳对信号; c)分别通过前后增益控制装置向左前后扬声器和左后扬声器提供所述双耳信号的左信号; d)分别通过前和后增益控制装置向右前扬声器和右后扬声器提供所述双耳信号的正确信号; e)根据声源的方位角控制前信号增益与后信号增益的比率; 以及f)通过相应的经弦波串扰消除装置在前信号对和后信号对上执行经昼夜串扰消除。