公开(公告)号：US09269360B2

公开(公告)日：2016-02-23

申请号：US13519313

申请日：2011-01-07

申请人： David Stanley McGrath

发明人： David Stanley McGrath

IPC分类号： H04B1/00 ,  G10L19/008

CPC分类号： G10L19/008

摘要： A system of linear equations is used to upmix a number N of audio signals to generate a larger number M of audio signals that are psychoacoustically decorrelated with respect to one another and that can be used to improve the representation of a diffuse sound field. The linear equations are defined by a matrix that specifies a set of vectors in an M dimensional space that are substantially orthogonal to each other. Methods for deriving the system of linear equations are disclosed.

摘要翻译： 使用线性方程组来混合N个音频信号以产生相对于彼此心理声学去相关的更大数量的M个音频信号，并且可用于改善扩散声场的表示。 线性方程由一个矩阵来定义，该矩阵指定一个基本上彼此正交的M维空间中的向量集合。 公开了导出线性方程组的方法。

公开(公告)号：US07756274B2

公开(公告)日：2010-07-13

申请号：US11468216

申请日：2006-08-29

申请人： Leonard Layton ,  David Stanley McGrath ,  Nigel Lloyd William Heyler ,  Stephen James Bennett ,  Richard James Cartwright ,  Geoffrey Alexander Drane

发明人： Leonard Layton ,  David Stanley McGrath ,  Nigel Lloyd William Heyler ,  Stephen James Bennett ,  Richard James Cartwright ,  Geoffrey Alexander Drane

IPC分类号： H04R5/00

CPC分类号： H04S3/00 ,  H04R27/00 ,  H04R2460/07 ,  H04S7/303 ,  H04S7/304 ,  H04S2420/11

摘要： A system for providing a listener with an augmented audio reality in a geographical environment said system comprising a position locating system for determining a current position and orientation of a listener in. said geographical environment; an audio track creation system for creating an audio track having a predetermined spatialization component dependent on an apparent location of an apparent source associated with said audio track in said geographical environment; an audio track rendering system adapted to render an audio signal based on said audio track to a series of speakers surrounding said listener such that said listener experiences an apparent preservation of said spatialization component; and an audio track playback system interconnected to said position locating system and said audio track creation system and adapted to forward a predetermined audio track to said audio rendering system for rendering depending on said current position and orientation of said listener in said geographical environment.

摘要翻译： 一种用于在地理环境中为听众提供增强的音频现实的系统，所述系统包括位置定位系统，用于确定所述地理环境中的听众的当前位置和方向; 音轨创建系统，用于创建具有取决于在所述地理环境中与所述音轨相关联的明显源的明显位置的预定空间化分量的音轨; 音轨描绘系统，适于将基于所述音频轨道的音频信号呈现给围绕所述收听者的一系列扬声器，使得所述收听者经历所述空间化分量的明显保留; 以及与所述位置定位系统和所述音频轨道创建系统相互连接的音轨播放系统，并且适于根据所述收听者在所述地理环境中的所述当前位置和方向将预定音轨转发到所述音频呈现系统进行渲染。

公开(公告)号：US06741706B1

公开(公告)日：2004-05-25

申请号：US09647260

申请日：2000-12-22

申请人： David Stanley McGrath ,  Adam Richard McKeag ,  Glenn Norman Dickins ,  Richard James Cartwright ,  Andrew Peter Reilly

发明人： David Stanley McGrath ,  Adam Richard McKeag ,  Glenn Norman Dickins ,  Richard James Cartwright ,  Andrew Peter Reilly

IPC分类号： H04B500

CPC分类号： H04S3/004 ,  H04S7/305 ,  H04S2400/01 ,  H04S2420/01

摘要： A method of processing a series of input audio signals representing a series of virtual audio sound sources placed at predetermined positions around a listener to produce a reduced set of audio output signals for playback over speaker devices placed around a listener, the method comprising the steps of: (a) for each of the input audio signals and for each of the audio output signals: (i) convolving the input audio signals with an initial head portion of a corresponding impulse response mapping substantially the initial sound and early reflections for an impulse response of a corresponding virtual audio source to a corresponding speaker device so as to form a series of initial responses; (b) for each of the input audio signals and for each of the audio output signals: (i) forming a combined mix from the audio input signals; and (ii) forming a combined convolution tail from the tails of the corresponding impulse responses; (iii) convolving the combined mix with the combined convolution tail to form a combined tail response; (c)for each of the audio output signals: (i) combining a corresponding series of initial responses and a corresponding combined tail response to form the audio output signal.

摘要翻译： 一种处理一系列输入音频信号的方法，所述一系列输入音频信号表示放置在收听者周围的预定位置处的一系列虚拟音频声源，以产生用于在围绕收听者放置的扬声器装置上重放的音频输出信号的减少集合，所述方法包括以下步骤： ：（a）对于每个输入音频信号和每个音频输出信号：（i）将输入音频信号与相应的脉冲响应的初始头部进行卷积，基本上映射脉冲响应的初始声音和早期反射 相应的虚拟音频源到相应的扬声器装置，以便形成一系列初始响应; （b）对于每个输入音频信号和每个音频输出信号：（i）从音频输入信号形成组合的混合; 和（ii）从相应的脉冲响应的尾部形成一个组合卷积尾; （iii）将组合的混合物与组合的卷积尾部进行卷积以形成组合的尾部响应; （c）对于每个音频输出信号：（i）组合相应的一系列初始响应和相应的组合尾部响应以形成音频输出信号。

公开(公告)号：US06373416B1

公开(公告)日：2002-04-16

申请号：US09283015

申请日：1999-03-31

申请人： David Stanley McGrath

发明人： David Stanley McGrath

IPC分类号： H03M300

CPC分类号： H03M3/43

摘要： A sigma delta modulator apparatus comprising: input means for inputting a current input signal; differencing means for forming the difference between a current input signal and a current output signal; filtering means for filtering the difference so as to produce a filtered difference signal; and output means outputting a minimum or maximum output value so as to substantially minimize the filtered difference signal.

摘要翻译： 一种Σ-Δ调制器装置，包括：输入装置，用于输入当前输入信号; 用于形成电流输入信号和电流输出信号之间的差的差分装置; 滤波装置，用于对差值进行滤波，以产生滤波差分信号; 以及输出装置输出最小或最大输出值，以使滤波差分信号基本上最小化。

公开(公告)号：US06370256B1

公开(公告)日：2002-04-09

申请号：US09283664

申请日：1999-03-31

申请人： David Stanley McGrath

发明人： David Stanley McGrath

IPC分类号： H04R502

CPC分类号： H04S7/304 ,  H04S1/002 ,  H04S1/005 ,  H04S2420/01

摘要： An apparatus for implementing a Head Related Transfer Function on an input audio signal in a headtracked listening environment comprising: a series of principle component filters attached to the input audio signal and each outputting a predetermined simulated sound arrival; a series of delay elements each attached to a corresponding one of the principle component filters and delaying the output of the filter by a variable amount depending on a delay input so as to produce a filter delay output; a summation means interconnected to the series of delay elements and summing the filter delay outputs to produce an audio speaker output signal; headtrack parameter mapping unit having a current orientation signal input and interconnected to each of the series of delay elements so as to provided the delay inputs.

摘要翻译： 一种用于在头部收听环境中对输入音频信号实现头部相关传送功能的装置，包括：一系列附加到输入音频信号的主要分量滤波器，并且每个输出音频信号输出预定的模拟声音到达; 一系列延迟元件，每个延迟元件附加到相应的一个主要分量滤波器，并且根据延迟输入将滤波器的输出延迟可变量，以产生滤波器延迟输出; 与所述一系列延迟元件相互连接并将所述滤波器延迟输出相加以产生音频扬声器输出信号的求和单元; 头部跟踪参数映射单元，其具有输入并互连到所述一系列延迟元件中的每一个的当前定向信号，以便提供所述延迟输入。

公开(公告)号：US5990818A

公开(公告)日：1999-11-23

申请号：US956311

申请日：1997-10-22

申请人： David Stanley McGrath

发明人： David Stanley McGrath

IPC分类号： H03M3/02 ,  H03M1/00

CPC分类号： G06J1/00 ,  H03M3/43 ,  H03M3/438 ,  H03M3/452

摘要： A method of processing audio input signals comprising 1-bit, Sigma-Delta Modulated (SDM) signals is disclosed including the steps of combining the audio input signals to form a combined audio input signal; and utilising a Sigma-Delta Modulator to convert the combined audio input signal to a corresponding Sigma-Delta Modulated output signal. The method can include a linear mix of the audio input signals and each audio input signal can multiplied by a corresponding gain factor before being added together with other of the audio input signals. The Sigma-Delta Modulator can include a noise shaping filter designed to amplify components of the audio input signals below a predetermined threshold frequency and the combining step can include utilising a negative feedback of the combined audio input signal. The noise shaping filter can utilise a series of integrating circuits as a means to decrease the sensitivity of the filter to errors in its coefficients.

摘要翻译： 公开了一种处理包括1比特，Σ-Δ调制（SDM）信号的音频输入信号的方法，包括组合音频输入信号以形成组合音频输入信号的步骤; 并利用Σ-Δ调制器将组合的音频输入信号转换成相应的Σ-Δ调制输出信号。 该方法可以包括音频输入信号和每个音频输入信号的线性混合可以与相应的增益因子相乘，然后与其他音频输入信号一起添加。 Σ-Δ调制器可以包括噪声整形滤波器，其设计用于放大低于预定阈值频率的音频输入信号的分量，并且组合步骤可以包括利用组合音频输入信号的负反馈。 噪声整形滤波器可以利用一系列积分电路作为降低滤波器对其系数误差的灵敏度的手段。

公开(公告)号：US20090079599A1

公开(公告)日：2009-03-26

申请号：US12087938

申请日：2007-01-18

申请人： David Stanley McGrath

发明人： David Stanley McGrath

IPC分类号： H03M7/00

CPC分类号： H03H17/0422

摘要： The sample rate of a digital signal is converted by a digital simulation of an analog filter. The simulation can update the states of complex poles in the analog filter at arbitrary times using different techniques. One technique updates the states at variable rates. Other techniques update the states at a fixed rate in response to values of input or output samples that are modified to account for offsets between the times of the samples and the times the states are updated. The states may be updated by using interpolations of complex exponential functions. Values of the complex exponential functions may be obtained from a product of values obtained from multiple lookup tables.

摘要翻译： 通过模拟滤波器的数字仿真来转换数字信号的采样率。 模拟可以使用不同的技术在任意时间更新模拟滤波器中的复极点的状态。 一种技术以可变速率更新状态。 其他技术响应于修改的输入或输出样本的值，以固定的速率来更新状态，以考虑样本时间和状态被更新的时间之间的偏移。 可以通过使用复数指数函数的内插来更新状态。 可以从从多个查找表获得的值的乘积获得复指数函数的值。

公开(公告)号：US07152082B2

公开(公告)日：2006-12-19

申请号：US10344682

申请日：2001-08-14

申请人： David Stanley McGrath

发明人： David Stanley McGrath

IPC分类号： G06F17/10 ,  H03G3/00

CPC分类号： H04S7/305 ,  H04S1/002

摘要： The invention provides a method and system for forming an output impulse response function. The method includes the steps of creating an initial impulse response, and dividing the impulse response into a head portion and a tail portion. The tail portion is high pass filtered, and low frequency components of the head portion are boosted. The low frequency boosted and high pass filtered respective head and tail portions are then combined into a modified output impulse response, which can then be used to spatialize an audio signal by convolving it.

公开(公告)号：US07116789B2

公开(公告)日：2006-10-03

申请号：US10206273

申请日：2002-07-26

申请人： Leonard Layton ,  David Stanley McGrath ,  Nigel Lloyd William Heyler ,  Stephen James Bennett ,  Richard James Cartwright ,  Geoffrey Alexander Drane

发明人： Leonard Layton ,  David Stanley McGrath ,  Nigel Lloyd William Heyler ,  Stephen James Bennett ,  Richard James Cartwright ,  Geoffrey Alexander Drane

IPC分类号： H04R5/00

CPC分类号： H04S3/00 ,  H04R27/00 ,  H04R2460/07 ,  H04S7/303 ,  H04S7/304 ,  H04S2420/11

摘要： A system for providing a listener with an augmented audio reality in a geographical environment said system comprising a position locating system for determining a current position and orientation of a listener in said geographical environment; an audio track creation system for creating an audio track having a predetermined spatialization component dependent on an apparent location of an apparent source associated with said audio track in said geographical environment; an audio track rendering system adapted to render an audio signal based on said audio track to a series of speakers surrounding said listener such that said listener experiences an apparent preservation of said spatialization component; and an audio track playback system interconnected to said position locating system and said audio track creation system and adapted to forward a predetermined audio track to said audio rendering system for rendering depending on said current position and orientation of said listener in said geographical environment.

摘要翻译： 一种用于在地理环境中为听众提供增强的音频现实的系统，所述系统包括位置定位系统，用于确定所述地理环境中听众的当前位置和方位; 音轨创建系统，用于创建具有取决于在所述地理环境中与所述音轨相关联的明显源的明显位置的预定空间化分量的音轨; 音轨描绘系统，适于将基于所述音频轨道的音频信号呈现给围绕所述收听者的一系列扬声器，使得所述收听者经历所述空间化分量的明显保留; 以及与所述位置定位系统和所述音频轨道创建系统相互连接的音轨播放系统，并且适于根据所述收听者在所述地理环境中的所述当前位置和方向将预定音轨转发到所述音频呈现系统进行渲染。

公开(公告)号：US06707918B1

公开(公告)日：2004-03-16

申请号：US09647755

申请日：2001-01-02

申请人： David Stanley McGrath ,  Adam Richard McKeag

发明人： David Stanley McGrath ,  Adam Richard McKeag

IPC分类号： H04R2900

CPC分类号： H04S7/305 ,  H04S2400/01 ,  H04S2420/11

摘要： A method for the creation of acoustic impulse responses for utilization in rendering to an array of speakers comprising the steps of measuring a room response function; extracting a series of discrete time arrivals from the measured room response function so as to have a reverberant residual response function; separately rendering the extracted series and the reverberant residual response function to the array of speakers to form a discrete response and a residual response; combining the discrete response and the residual response to form an acoustic impulse response for the array of speakers.

摘要翻译： 一种用于创建用于渲染到扬声器阵列的声学脉冲响应的方法，包括以下步骤：测量房间响应函数; 从测量的房间响应函数中提取一系列离散时间到达，以具有混响残差响应函数; 将提取的系列和混响残差响应函数分别呈现给扬声器阵列以形成离散响应和残余响应; 组合离散响应和残余响应以形成扬声器阵列的声脉冲响应。