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    • 4. 发明申请
    • IMPROVEMENTS IN OR RELATING TO SOUND REPRODUCTION SYSTEMS
    • 声音再生系统的改进或相关
    • WO1990000851A1
    • 1990-01-25
    • PCT/GB1989000773
    • 1989-07-07
    • ADAPTIVE CONTROL LIMITEDNELSON, Philip, ArthurELLIOTT, Stephen, JohnSTOTHERS, Ian, McGregor
    • ADAPTIVE CONTROL LIMITED
    • H04S01/00
    • H03G5/005H03G5/165H04S1/002H04S3/00
    • A stereophonic sound reproduction system is aimed at synthesizing at a multiplicity of points (L) in the listening space an auditory effect obtaining at corresponding points (K) in the recording space, to compensate for crosstalk (C21, C12) between the loudspeakers, the acoustic response of the listening space, and imperfections in the frequency response of the speaker channels. Each speaker channel incorporates a digital filter (H) the characteristics of which are ajusted in response to measurements of the reproduced field. The digital filters are provided by an inverse filter matrix (H) of which the matrix elements (Hij) are determined by a least squares technique, applied so as to minimise the sum of the squared errors resulting from the difference between the actual system impulse response and a desired impulse response. A full bandwidth signal is transmitted by a bypass route for combination with the output signal (9) from the filter, the bypass route including a delay means (F).
    • 立体声再现系统的目的在于在收听空间中的多个点(L)处合成在记录空间中的相应点(K)获得的听觉效果,以补偿扬声器之间的串扰(C21,C12), 收听空间的声响应以及扬声器通道频率响应的不完善。 每个扬声器通道包括数字滤波器(H),其特性是响应于再现场的测量而调整的。 数字滤波器由反滤波器矩阵(H)提供,其中矩阵元素(Hij)由最小二乘法确定,以便最小化由实际系统脉冲响应之间的差异导致的平方误差之和 和期望的脉冲响应。 通过旁路路由与来自滤波器的输出信号(9)组合的全带宽信号,旁路路径包括延迟装置(F)。
    • 10. 发明申请
    • SOUND RECORDING AND REPRODUCTION SYSTEMS
    • 声音记录和复制系统
    • WO1996006515A1
    • 1996-02-29
    • PCT/GB1995002005
    • 1995-08-24
    • ADAPTIVE AUDIO LIMITEDORDUÑA-BUSTAMANTE, FelipeKIRKEBY, OleHAMADA, HareoNELSON, Philip, Arthur
    • ADAPTIVE AUDIO LIMITED
    • H04S01/00
    • H04S1/002H04S1/005H04S1/007H04S3/002H04S2420/01
    • A method of recording sound for reproduction by a plurality of loudspeakers, or for processing sound for reproduction by a plurality of loudspeakers, is described in which some of the reproduced sound appears to a listener to emmanate from a virtual source which is spaced from the loudspeakers. A filter means (H) is used either in creating the recording, or in processing the recorded signals for supply to loudspeakers, the filter means (H) being created in a filter design step in which: a) a technique is employed to minimise error between the signals (w) reproduced at the intended position of a listener on playing the recording through the loudspeakers, and desired signals (d) at the intended position, wherein: b) said desired signals (d) to be produced at the listener are defined by signals (or an estimate of the signals) that would be produced at the ears of (or in the region of) the listener in said intended position by a source at the desired position of the virtual source. A least squares technique may be employed to minimise the time averaged error between the signal reproduced at the intended position of a listener and the desired signal, or it may be applied to the frequency domain.
    • 描述了一种通过多个扬声器记录用于再现的声音或用于处理由多个扬声器进行再现的声音的方法,其中一些再现的声音出现在听众身上,从与扬声器间隔开的虚拟源显现 。 滤波器装置(H)用于创建记录,或者在处理记录的信号供给扬声器时,在滤波器设计步骤中产生滤波器装置(H),其中:a)使用技术来最小化误差 在通过扬声器播放记录时在收听者的预期位置处再现的信号(w)和期望的信号(d)之间,其中:b)在收听者处产生的所需期望信号(d) 由在虚拟源的期望位置处的源在所述预期位置处的(或在该区域中)产生的信号(或信号的估计)定义。 可以采用最小二乘法来最小化在收听者的预期位置再现的信号与期望信号之间的时间平均误差,或者将其应用于频域。