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1. 发明申请

WO2003042841A1 LOW LATENCY COMPUTATION IN REAL TIME UTILIZING A DSP PROCESSOR 审中-公开
标题翻译：利用DSP处理器实时实时的低延迟计算
公开(公告)号：WO2003042841A1
公开(公告)日：2003-05-22
申请号：PCT/AU2002/001535
申请日：2002-11-11
申请人： LAKE TECHNOLOGY LIMITED , MCGRATH, David, Stanley , REILLY, Andrew
发明人： MCGRATH, David, Stanley , REILLY, Andrew
IPC分类号： G06F13/00
CPC分类号： G06F17/15
摘要： A method for applying a computation utilising a processor (112) capable of accessing an on-chip memory (114) and data from an off-chip source (116), the method comprising the iterative steps of retrieving at the on-chip memory (114) successive frames of input data from the off-chip source (116); computing from a current input frame of data (30) available in the on-chip memory current result elements for completing a current output frame of results (33, 34, 35), and pre-computing from the current frame of input data future result elements for contributing to at least one future output frame of results.
摘要翻译：一种利用能够访问片上存储器（114）的处理器（112）和来自芯片外源（116）的数据来应用计算的方法，所述方法包括迭代步骤，在片上存储器 114）来自片外源（116）的连续帧的输入数据; 从可用于片上存储器当前结果元素的数据（30）的当前输入帧计算以完成当前输出结果帧（33,34,35），以及从当前输入数据帧的未来计算结果促成至少一个未来输出结果框架的元素。

2. 发明申请

WO2007084687A1 ASYNCHRONOUS SAMPLE RATE CONVERSION USING A DIGITAL SIMULATION OF AN ANALOG FILTER 审中-公开
标题翻译：使用模拟滤波器的数字模拟的异步采样速率转换
公开(公告)号：WO2007084687A1
公开(公告)日：2007-07-26
申请号：PCT/US2007/001472
申请日：2007-01-18
申请人： DOLBY LABORATORIES LICENSING CORPORATION , MCGRATH, David Stanley
发明人： MCGRATH, David Stanley
IPC分类号： H03H17/04
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，以考虑采样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。

3. 发明申请

WO2008021110A3 AUDIO-PEAK LIMITING IN SLOW AND FAST STAGES 审中-公开
标题翻译：音频峰值限制在慢速和快速阶段
公开(公告)号：WO2008021110A3
公开(公告)日：2008-06-05
申请号：PCT/US2007017588
申请日：2007-08-08
申请人： DOLBY LAB LICENSING CORP , SMITHERS MICHAEL JOHN , CROCKETT BRETT GRAHAM , MCGRATH DAVID STANLEY
发明人： SMITHERS MICHAEL JOHN , CROCKETT BRETT GRAHAM , MCGRATH DAVID STANLEY
IPC分类号： H03G7/00 , H03G11/00
CPC分类号： H03G7/007 , H03G11/008
摘要： A method and apparatus for limiting the absolute magnitude of an audio signal. The method may include firstly variable-gain reducing the gain of an audio signal, and then secondly variable-gain reducing the gain of the audio signal faster than the first variable-gain reduction, thereby limiting the absolute magnitude of the audio signal to a threshold. The first variable-gain reduction may include variable-gain reducing the gain of the audio signal in a first stage, and the second variable-gain reduction may include variable-gain reducing the gain of the audio signal in a second stage that reduces the gain faster than the first stage. The second variable-gain reduction may include delaying the audio signal, finding a peak among the delayed audio signal, calculating a fast gain from a found peak, and modifying the delayed audio signal with the calculated fast gain.
摘要翻译：一种用于限制音频信号的绝对量值的方法和设备。该方法可以首先包括可变增益降低音频信号的增益，然后可变增益比第一可变增益降低更快地降低音频信号的增益，由此将音频信号的绝对量限制为阈值。第一可变增益降低可以包括降低第一级中的音频信号的增益的可变增益，并且第二可变增益降低可以包括降低第二级中的音频信号的增益的可变增益，比第一阶段快。第二可变增益降低可以包括延迟音频信号，在延迟的音频信号中找到峰值，从找到的峰值计算快速增益，以及用计算的快速增益修改延迟的音频信号。

4. 发明申请

WO2006039748A1 IMPROVED HEAD RELATED TRANSFER FUNCTIONS FOR PANNED STEREO AUDIO CONTENT 审中-公开
标题翻译：改进的头相关传输功能，用于PANNO立体声音频内容
公开(公告)号：WO2006039748A1
公开(公告)日：2006-04-20
申请号：PCT/AU2005/001568
申请日：2005-10-10
申请人： LAKE TECHNOLOGY LIMITED , McGRATH, David, Stanley
发明人： McGRATH, David, Stanley
IPC分类号： H04S5/00
CPC分类号： H04S3/00 , H04S2400/01 , H04S2420/01
摘要： A method to process audio signals, an apparatus accepting audio signals, a carrier medium that carried instructions for a processor to implement the method to process audio signals, and a carrier medium carrying filter data to implement a filter of audio signals. The method includes filtering a pair of audio input signals by a process that produces a pair of output signals corresponding to the results of: filtering each of the input signals with a HRTF filter pair, and adding the HRTF filtered signals. The HRTF filter pair is such that a listener listening to the pair of output signals through headphones experiences sounds from a pair of desired virtual speaker locations. Furthermore, the filtering is such that, in the case that the pair of audio input signals includes a panned signal component, the listener listening to the pair of output signals through headphones is provided with the sensation that the panned signal component emanates from a virtual sound source at a center location between the virtual speaker locations.
摘要翻译：一种处理音频信号的方法，接受音频信号的装置，承载处理器执行用于处理音频信号的方法的指令的载波介质，以及承载滤波器数据的载波介质以实现音频信号的滤波器。该方法包括通过产生与以下结果相对应的一对输出信号的处理对一对音频输入信号进行滤波：用HRTF滤波器对对每个输入信号进行滤波，以及将HRTF滤波信号相加。 HRTF滤波器对使得通过耳机听取一对输出信号的听者从一对期望的虚拟扬声器位置发出声音。此外，滤波是这样的：在一对音频输入信号包括平移信号分量的情况下，通过耳机收听一对输出信号的收听者被提供了从虚拟声音发出的摇摄信号分量的感觉源在虚拟扬声器位置之间的中心位置。

5. 发明申请

WO03058473A8 INTERACTIVE SPATALIZED AUDIOVISUAL SYSTEM 审中-公开
标题翻译：交互式分散式音频系统
公开(公告)号：WO03058473A8
公开(公告)日：2003-08-21
申请号：PCT/AU0300019
申请日：2003-01-09
申请人： LAKE TECHNOLOGY LTD , MCGRATH DAVID STANLEY , HECKENBERG DANIEL RICHARD , BENNETT STEPHEN JAMES
发明人： MCGRATH DAVID STANLEY , HECKENBERG DANIEL RICHARD , BENNETT STEPHEN JAMES
IPC分类号： G06F3/16 , G06F13/00 , H04L12/18 , H04L29/06 , H04M3/56 , H04S1/00 , H04S3/00 , H04S7/00 , G06F15/16 , G10L21/00 , H04R5/00
CPC分类号： H04L12/1822 , H04L67/38 , H04M3/56 , H04M3/564 , H04M3/568 , H04S3/008
摘要： An interactive spatialized audiovisual system links a plurality of remote used terminals. The system comprises a networked computer having an associated user database including user status information. Input means are provided at the computer for receiving a plurality of audio streams and associated locating data from the remote user terminals for virtually locating the users relative to one another within a virtual user environment such as a chat room environment. Selection means are provided for enabling selection of at least the first group of the audio streams in a first selection process based on status information in the user database. Output means output the selected group of audio streams and associated locating data for spatialization of the audio streams relative to a first listener-based audio reference frame which is substantially coherent with visual representations of the audio sources defined by the locating data at the first user terminal. Merging means are provided for merging at least some of the audio streams into a merged audio stream for transmittal to the first and other user terminal, with the merged audio stream being spatialized so as to provide for a spatialized background audio effect in the audio reference frame at the user terminal.
摘要翻译：交互式空间视听系统连接多个远程使用终端。该系统包括具有包括用户状态信息的关联用户数据库的联网计算机。在计算机上提供输入装置，用于接收来自远程用户终端的多个音频流和相关的定位数据，用于在虚拟用户环境（例如聊天室环境）内虚拟地定位用户相对于彼此的位置。提供选择装置，用于基于用户数据库中的状态信息在第一选择过程中选择至少第一组音频流。输出装置输出所选择的一组音频流和相关联的定位数据以用于音频流相对于第一基于收听者的音频参考帧的空间化，所述第一基于收听者的音频参考帧基本上与由第一用户终端处的定位数据定义的音频源的视觉表示。提供了合并装置，用于将至少一些音频流合并成合并音频流以传送给第一和其他用户终端，合并音频流被空间化以便在音频参考帧中提供空间化背景音频效果在用户终端。

6. 发明申请

WO2003058473A1 INTERACTIVE SPATALIZED AUDIOVISUAL SYSTEM 审中-公开
标题翻译：交互式音乐系统
公开(公告)号：WO2003058473A1
公开(公告)日：2003-07-17
申请号：PCT/AU2003/000019
申请日：2003-01-09
申请人： LAKE TECHNOLOGY LIMITED , MCGRATH, David, Stanley , HECKENBERG, Daniel, Richard , BENNETT, Stephen, James
发明人： MCGRATH, David, Stanley , HECKENBERG, Daniel, Richard , BENNETT, Stephen, James
IPC分类号： G06F15/16
CPC分类号： H04L12/1822 , H04L67/38 , H04M3/56 , H04M3/564 , H04M3/568 , H04S3/008
摘要： An interactive spatialized audiovisual system links a plurality of remote used terminals. The system comprises a networked computer having an associated user database including user status information. Input means are provided at the computer for receiving a plurality of audio streams and associated locating data from the remote user terminals for virtually locating the users relative to one another within a virtual user environment such as a chat room environment. Selection means are provided for enabling selection of at least the first group of the audio streams in a first selection process based on status information in the user database. Output means output the selected group of audio streams and associated locating data for spatialization of the audio streams relative to a first listener-based audio reference frame which is substantially coherent with visual representations of the audio sources defined by the locating data at the first user terminal. Merging means are provided for merging at least some of the audio streams into a merged audio stream for transmittal to the first and other user terminal, with the merged audio stream being spatialized so as to provide for a spatialized background audio effect in the audio reference frame at the user terminal.
摘要翻译：交互式空间化视听系统链接多个远程使用终端。该系统包括具有包括用户状态信息的关联用户数据库的联网计算机。在计算机处提供输入装置，用于从诸如聊天室环境的虚拟用户环境中接收来自远程用户终端的多个音频流和相关联的定位数据，用于虚拟地定位用户相对于彼此。提供选择装置，用于基于用户数据库中的状态信息在第一选择过程中至少选择第一组音频流。输出装置输出所选择的一组音频流和相关联的定位数据，用于相对于基于第一听众的音频参考帧进行空间化，该音频参考帧与由第一用户终端上的定位数据定义的音频源的视觉表示基本一致。合并装置被提供用于将至少一些音频流合并成合并的音频流以传送到第一和其他用户终端，其中合并的音频流被空间化，以便提供音频参考帧中的空间化背景音频效果在用户终端。

7. 发明申请

WO2002084885A1 HIGH FREQUENCY SIGNAL CONSTRUCTION METHOD AND APPARATUS 审中-公开
标题翻译：高频信号构造方法及装置
公开(公告)号：WO2002084885A1
公开(公告)日：2002-10-24
申请号：PCT/AU2002/000464
申请日：2002-04-10
申请人： LAKE TECHNOLOGY LIMITED , MCGRATH, David, Stanley
发明人： MCGRATH, David, Stanley
IPC分类号： H03M7/30
CPC分类号： G11B20/10212 , G11B20/10037 , G11B20/10046 , G11B20/1876 , G11B2020/10546
摘要： A method of adding high frequency content to an input signal to form an augmented signal, the method comprising the steps of: (a) providing an initial signal having a first predetermined lower spectral range; (b) utilising the initial signal to form synthesised high frequency components of the initial signal; (c) filtering the initial signal with a low pass filter and filtering the synthesised high frequency components with a high pass filter (d) combining the filtered signals to form the augmented signal.
摘要翻译：一种将高频内容添加到输入信号以形成增强信号的方法，所述方法包括以下步骤：（a）提供具有第一预定较低光谱范围的初始信号; （b）利用初始信号形成初始信号的合成高频分量; （c）用低通滤波器对初始信号进行滤波，并用合成滤波信号的高通滤波器（d）对合成的高频分量进行滤波，形成增强信号。

8. 发明申请

WO1994001933A1 DIGITAL FILTER HAVING HIGH ACCURACY AND EFFICIENCY 审中-公开
标题翻译：数字滤波器具有高精度和高效率
公开(公告)号：WO1994001933A1
公开(公告)日：1994-01-20
申请号：PCT/AU1993000330
申请日：1993-07-05
申请人： LAKE DSP PTY. LIMITED , McGRATH, David, Stanley
发明人： LAKE DSP PTY. LIMITED
IPC分类号： H03H17/06
CPC分类号： H03H17/06 , G06F17/142 , H03H17/0213
摘要： Apparatus for and methods of operation of digital filters and certain other electronic digital signal processing devices are provided to improve the accuracy and efficiency of filtering. Particularly, the apparatus and method includes a digital filter with a long impulse response and lower latency, built by operating a numbr of small component filters (F1, F2, F3) in parallel and combining their outputs by addition, with each component filter operating with a different delay such that the net operation of the ensemble of said component filters is the same as a single filter with a longer impulse response, and the latency of the ensemble is equal to the shortest latency of the component filters. At least one group of the component filters is implemented using a Discrete Fourier Transform technique. A Fourier transform processor adapted to efficiently transform strings of real data is also described.
摘要翻译：提供数字滤波器和某些其它电子数字信号处理装置的装置和操作方法以提高滤波的准确性和效率。特别地，该装置和方法包括具有长脉冲响应和较低等待时间的数字滤波器，其通过并行操作数量小的组件滤波器（F1，F2，F3）并通过相加来组合它们的输出而构建，每个组件滤波器与不同的延迟使得所述组件滤波器的组合的净运行与具有较长脉冲响应的单个滤波器相同，并且所述组合的等待时间等于组件滤波器的最短等待时间。使用离散傅里叶变换技术来实现至少一组组件滤波器。还描述了适于有效地变换实际数据串的傅里叶变换处理器。

9. 发明申请

WO2008039339A3 IMPROVED SPATIAL RESOLUTION OF THE SOUND FIELD FOR MULTI-CHANNEL AUDIO PLAYBACK SYSTEMS BY DERIVING SIGNALS WITH HIGH ORDER ANGULAR TERMS 审中-公开
公开(公告)号：WO2008039339A3
公开(公告)日：2008-04-03
申请号：PCT/US2007/020284
申请日：2007-09-19
申请人： DOLBY LABORATORIES LICENSING CORPORATION , MCGRATH, David Stanley
发明人： MCGRATH, David Stanley
IPC分类号： H04S3/02
摘要： Audio signals that represent a sound field with increased spatial resolution are obtained by deriving signals that represent the sound field with high-order angular terms. This is accomplished by analyzing input audio signals representing the sound field with zero-order and first-order angular terms to derive statistical characteristics of one or more angular directions of acoustic energy in the sound field. Processed signals are derived from weighted combinations of the input audio signals in which the input audio signals are weighted according to the statistical characteristics. The input audio signals and the processed signals represent the sound field as a function of angular direction with angular terms of one or more orders greater than one.

10. 发明申请

WO2008039339A2 IMPROVED SPATIAL RESOLUTION OF THE SOUND FIELD FOR MULTI-CHANNEL AUDIO PLAYBACK SYSTEMS BY DERIVING SIGNALS WITH HIGH ORDER ANGULAR TERMS 审中-公开
标题翻译：通过使用高阶格式条款获取信号改善多通道音频播放系统的声场的空间分辨率
公开(公告)号：WO2008039339A2
公开(公告)日：2008-04-03
申请号：PCT/US2007020284
申请日：2007-09-19
申请人： DOLBY LAB LICENSING CORP , MCGRATH DAVID STANLEY
发明人： MCGRATH DAVID STANLEY
CPC分类号： H04S3/02 , H04R5/027 , H04S2400/15 , H04S2420/11
摘要： Audio signals that represent a sound field with increased spatial resolution are obtained by deriving signals that represent the sound field with high-order angular terms. This is accomplished by analyzing input audio signals representing the sound field with zero-order and first-order angular terms to derive statistical characteristics of one or more angular directions of acoustic energy in the sound field. Processed signals are derived from weighted combinations of the input audio signals in which the input audio signals are weighted according to the statistical characteristics. The input audio signals and the processed signals represent the sound field as a function of angular direction with angular terms of one or more orders greater than one.
摘要翻译：通过导出表示具有高阶角度的声场的信号来获得表示具有增加的空间分辨率的声场的音频信号。这是通过分析表示具有零级和一阶角度项的声场的输入音频信号来实现的，以导出声场中声能的一个或多个角度方向的统计特性。根据统计特性，输入音频信号被加权的输入音频信号的加权组合导出处理信号。输入音频信号和经处理的信号表示作为角度方向的函数的声场，其角度项大于一个或多个。

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