公开(公告)号：US09349382B2

公开(公告)日：2016-05-24

申请号：US14807532

申请日：2015-07-23

Applicant: Dolby International AB

Inventor： Per Ekstrand

IPC: G06F17/10 ,  G10L21/00 ,  H03H17/02

CPC classification number: H04R3/04 ,  G06F17/10 ,  G06F17/11 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/26 ,  G10L19/265 ,  G10L21/00 ,  H03H17/0201 ,  H03H17/0248 ,  H03H17/0266 ,  H03H17/0275 ,  H03H17/0294 ,  H03H2017/0297 ,  H04S7/307

Abstract: The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Abstract translation: 该文件涉及调制的次采样数字滤波器组，以及用于设计这种滤波器组的方法和系统。 特别地，本文件提出了一种用于改进低延迟调制数字滤波器组的方法和装置。 该方法采用非对称低通原型滤波器的调制和用于优化滤波器系数的新方法。 此外，给出了使用640系数的原型滤波器长度和319个采样的系统延迟的64信道滤波器组的具体设计。 该方法基本上减少了由于子带信号的独立修改引起的混叠所产生的伪像，例如当使用滤波器组作为频谱均衡器时。 该方法优选地以在标准PC或数字信号处理器（DSP）上运行的软件实现，但也可以在定制芯片上被硬编码。 该方法为各种类型的数字均衡器，自适应滤波器，多频带压缩器和用于高频重建（HFR）或参数立体声系统的频谱包络调整滤波器组提供了改进。

公开(公告)号：US09319028B2

公开(公告)日：2016-04-19

申请号：US14217317

申请日：2014-03-17

Applicant: Digital Intelligence, L.L.C.

Inventor： Carlos A. Ricci ,  Vladimir V. Kovtun

IPC: G10L21/14 ,  H03H17/02 ,  G10L19/26 ,  A61B5/0432 ,  G01V1/28

CPC classification number: G10L19/26 ,  A61B5/0432 ,  G01V1/28 ,  G01V2210/43 ,  H03H17/0201 ,  H03H17/0248 ,  H03H17/0266

Abstract: A system and method for representing quasi-periodic waveforms, for example, representing a plurality of limited decompositions of the quasi-periodic waveform. Each decomposition includes a first and second amplitude value and at least one time value. In some embodiments, each of the decompositions is phase adjusted such that the arithmetic sum of the plurality of limited decompositions reconstructs the quasi-periodic waveform. Data-structure attributes are created and used to reconstruct the quasi-periodic waveform. Features of the quasi-periodic wave are tracked using pattern-recognition techniques. The fundamental rate of the signal (e.g., heartbeat) can vary widely, for example by a factor of 2-3 or more from the lowest to highest frequency. To get quarter-phase representations of a component (e.g., lowest frequency “rate” component) that varies over time (by a factor of two to three) many overlapping filters use bandpass and overlap parameters that allow tracking the component's frequency version on changing quarter-phase basis.

Abstract translation: 用于表示准周期波形的系统和方法，例如，表示准周期波形的多个有限分解。 每个分解包括第一和第二振幅值和至少一个时间值。 在一些实施例中，每个分解被相位调整，使得多个有限分解的算术和重建准周期波形。 数据结构属性被创建并用于重构准周期波形。 使用模式识别技术跟踪准周期波的特征。 信号的基本速率（例如，心跳）可以广泛地变化，例如从最低频率到最高频率的2-3倍或更多倍。 为了获得随时间变化的分量（例如，最低频率“速率”分量）的四分之一相位表示（两倍至三倍），许多重叠滤波器使用带通和重叠参数，允许在变化的季度跟踪组件的频率版本 的基础。

公开(公告)号：US09264018B2

公开(公告)日：2016-02-16

申请号：US13902811

申请日：2013-05-25

Applicant: Acoustic Processing Technology, Inc.

Inventor： Thomas E. Curtis ,  Steven B. Sidman

IPC: H03H17/02

CPC classification number: H03H17/0201

Abstract: Filter-chain-creating, digital signal-processing structure, for performing frequency band analysis and selection, which structure features a time-slice-based digital fabricating/instantiating engine, and engine-software-operating structure designed to operate the engine in a time-slice-based fabrication mode to create a chained arrangement of at least one of (a) Type-I, and (b) combined Type-I and Type-I wave digital filter (WDF) agencies in an overall, composite WDF structure to function for frequency band analysis and selection.

Abstract translation: 滤波链创建，数字信号处理结构，用于执行频带分析和选择，哪种结构具有基于时间片的数字制造/实例化引擎，以及设计用于在一段时间内操作发动机的发动机 - 软件操作结构 （a）Type-I和（b）组合的I型和I型数字滤波器（WDF）机构中的至少一个在整体的复合WDF结构中的链式布置， 功能用于频带分析和选择。

公开(公告)号：US20150333734A1

公开(公告)日：2015-11-19

申请号：US14810174

申请日：2015-07-27

Applicant: Dolby International AB

Inventor： Per Ekstrand

IPC: H03H17/02 ,  G06F17/10

CPC classification number: H04R3/04 ,  G06F17/10 ,  G06F17/11 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/26 ,  G10L19/265 ,  G10L21/00 ,  H03H17/0201 ,  H03H17/0248 ,  H03H17/0266 ,  H03H17/0275 ,  H03H17/0294 ,  H03H2017/0297 ,  H04S7/307

Abstract: The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

公开(公告)号：US20150332703A1

公开(公告)日：2015-11-19

申请号：US14807532

申请日：2015-07-23

Applicant: Dolby International AB

Inventor： Per Ekstrand

IPC: G10L21/00

CPC classification number: H04R3/04 ,  G06F17/10 ,  G06F17/11 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/26 ,  G10L19/265 ,  G10L21/00 ,  H03H17/0201 ,  H03H17/0248 ,  H03H17/0266 ,  H03H17/0275 ,  H03H17/0294 ,  H03H2017/0297 ,  H04S7/307

Abstract: The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

Abstract translation: 该文件涉及调制的次采样数字滤波器组，以及用于设计这种滤波器组的方法和系统。 特别地，本文件提出了一种用于改进低延迟调制数字滤波器组的方法和装置。 该方法采用非对称低通原型滤波器的调制和用于优化滤波器系数的新方法。 此外，给出了使用640系数的原型滤波器长度和319个采样的系统延迟的64信道滤波器组的具体设计。 该方法基本上减少了由于子带信号的独立修改引起的混叠所产生的伪像，例如当使用滤波器组作为频谱均衡器时。 该方法优选地以在标准PC或数字信号处理器（DSP）上运行的软件实现，但也可以在定制芯片上被硬编码。 该方法为各种类型的数字均衡器，自适应滤波器，多频带压缩器和用于高频重建（HFR）或参数立体声系统的频谱包络调整滤波器组提供了改进。

公开(公告)号：US08880572B2

公开(公告)日：2014-11-04

申请号：US13201572

申请日：2010-02-17

Applicant: Per Ekstrand

Inventor： Per Ekstrand

IPC: G06F7/00 ,  H03H17/02

CPC classification number: H04R3/04 ,  G06F17/10 ,  G06F17/11 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/26 ,  G10L19/265 ,  G10L21/00 ,  H03H17/0201 ,  H03H17/0248 ,  H03H17/0266 ,  H03H17/0275 ,  H03H17/0294 ,  H03H2017/0297 ,  H04S7/307

Abstract: The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a (64) channel filter bank using a prototype filter length of (640) coefficients and a system delay of (319) samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filterbanks used in high frequency reconstruction (HFR) or parametric stereo systems.

Abstract translation: 该文件涉及调制的次采样数字滤波器组，以及用于设计这种滤波器组的方法和系统。 特别地，本文件提出了一种用于改进低延迟调制数字滤波器组的方法和装置。 该方法采用非对称低通原型滤波器的调制和用于优化滤波器系数的新方法。 此外，给出了使用（640）系数的原型滤波器长度和（319）个样本的系统延迟的（64）信道滤波器组的具体设计。 该方法基本上减少了由于子带信号的独立修改引起的混叠所产生的伪像，例如当使用滤波器组作为频谱均衡器时。 该方法优选地以在标准PC或数字信号处理器（DSP）上运行的软件实现，但也可以在定制芯片上被硬编码。 该方法为各种类型的数字均衡器，自适应滤波器，多频带压缩器以及用于高频重构（HFR）或参数立体声系统的频谱包络调整滤波器组提供了改进。

公开(公告)号：US20140289297A1

公开(公告)日：2014-09-25

申请号：US14217234

申请日：2014-03-17

Applicant: Digital Intelligence, L.L.C.

Inventor： Carlos A. Ricci ,  Vladimir V. Kovtun

IPC: H03H17/02

CPC classification number: G10L19/26 ,  A61B5/0432 ,  G01V1/28 ,  G01V2210/43 ,  H03H17/0201 ,  H03H17/0248 ,  H03H17/0266

Abstract: A system and method for representing quasi-periodic (“qp”) waveforms, for example, representing a plurality of limited decompositions of the qp waveform. Each decomposition includes a first and second amplitude value and at least one time value. In some embodiments, each of the decompositions is phase adjusted such that the arithmetic sum of the plurality of limited decompositions reconstructs the qp waveform. Data-structure attributes are created and used to reconstruct the qp waveform. Features of the qp wave are tracked using pattern-recognition techniques. The fundamental rate of the signal (e.g., heartbeat) can vary widely, for example by a factor of 2-3 or more from the lowest to highest frequency. To get quarter-phase representations of a component (e.g., lowest frequency “rate” component) that varies over time (by a factor of two to three) many overlapping filters use bandpass and overlap parameters that allow tracking the component's frequency version on changing quarter-phase basis.

Abstract translation: 用于表示准周期（“qp”）波形的系统和方法，例如，表示qp波形的多个限制分解。 每个分解包括第一和第二振幅值和至少一个时间值。 在一些实施例中，每个分解被相位调整，使得多个有限分解的算术和重建qp波形。 数据结构属性被创建并用于重建qp波形。 使用模式识别技术跟踪qp波的特征。 信号的基本速率（例如，心跳）可以广泛地变化，例如从最低频率到最高频率的2-3倍或更多倍。 为了获得随时间变化的分量（例如，最低频率“速率”分量）的四分之一相位表示（两倍至三倍），许多重叠滤波器使用带通和重叠参数，允许在变化的季度跟踪组件的频率版本 的基础。

公开(公告)号：US20130339416A1

公开(公告)日：2013-12-19

申请号：US13902811

申请日：2013-05-25

Applicant: Acoustic Processing Technology, Inc.

Inventor： Thomas E. Curtis ,  Steven B. Sidman

IPC: H03H17/02

CPC classification number: H03H17/0201

Abstract: Filter-chain-creating, digital signal-processing structure, for performing frequency band analysis and selection, which structure features a time-slice-based digital fabricating/instantiating engine, and engine-software-operating structure designed to operate the engine in a time-slice-based fabrication mode to create a chained arrangement of at least one of (a) Type-I, and (b) combined Type-I and Type-I wave digital filter (WDF) agencies in an overall, composite WDF structure to function for frequency band analysis and selection.

Abstract translation: 滤波链创建，数字信号处理结构，用于执行频带分析和选择，哪种结构具有基于时间片的数字制造/实例化引擎，以及设计用于在一段时间内操作发动机的发动机 - 软件操作结构 （a）Type-I和（b）组合的I型和I型数字滤波器（WDF）机构中的至少一个在整体的复合WDF结构中的链式布置， 功能用于频带分析和选择。

公开(公告)号：US08386244B2

公开(公告)日：2013-02-26

申请号：US13220679

申请日：2011-08-29

Applicant: Carlos A. Ricci ,  Vladimir V. Kovtun

Inventor： Carlos A. Ricci ,  Vladimir V. Kovtun

IPC: A61B5/04 ,  G10L21/00

CPC classification number: H03H17/0201 ,  A61B5/0006 ,  A61B5/04014 ,  A61B5/0432 ,  A61B5/044 ,  G06K9/00523

Abstract: The present invention provides a system and method for representing quasi-periodic (“qp”) waveforms comprising, representing a plurality of limited decompositions of the qp waveform, wherein each decomposition includes a first and second amplitude value and at least one time value. In some embodiments, each of the decompositions is phase adjusted such that the arithmetic sum of the plurality of limited decompositions reconstructs the qp waveform. These decompositions are stored into a data structure having a plurality of attributes. Optionally, these attributes are used to reconstruct the qp waveform, or patterns or features of the qp wave can be determined by using various pattern-recognition techniques. Some embodiments provide a system that uses software, embedded hardware or firmware to carry out the above-described method. Some embodiments use a computer-readable medium to store the data structure and/or instructions to execute the method.

Abstract translation: 本发明提供一种用于表示准周期（qp）波形的系统和方法，包括表示qp波形的多个有限分解，其中每个分解包括第一和第二振幅值和至少一个时间值。 在一些实施例中，每个分解被相位调整，使得多个限制分解的算术和重建qp波形。 这些分解被存储到具有多个属性的数据结构中。 可选地，这些属性用于重建qp波形，或者可以通过使用各种模式识别技术来确定qp波的图案或特征。 一些实施例提供使用软件，嵌入式硬件或固件来执行上述方法的系统。 一些实施例使用计算机可读介质来存储用于执行该方法的数据结构和/或指令。

公开(公告)号：US20100195770A1

公开(公告)日：2010-08-05

申请号：US12760554

申请日：2010-04-15

Applicant: Carlos A. Ricci ,  Vladimir V. Kovtun

Inventor： Carlos A. Ricci ,  Vladimir V. Kovtun

IPC: H03D3/00

CPC classification number: H03H17/0201 ,  A61B5/0006 ,  A61B5/04014 ,  A61B5/0432 ,  A61B5/044 ,  G06K9/00523

Abstract: The present invention provides a system and method for representing quasi-periodic (“qp”) waveforms comprising, representing a plurality of limited decompositions of the qp waveform, wherein each decomposition includes a first and second amplitude value and at least one time value. In some embodiments, each of the decompositions is phase adjusted such that the arithmetic sum of the plurality of limited decompositions reconstructs the qp waveform. These decompositions are stored into a data structure having a plurality of attributes. Optionally, these attributes are used to reconstruct the qp waveform, or patterns or features of the qp wave can be determined by using various pattern-recognition techniques. Some embodiments provide a system that uses software, embedded hardware or firmware to carry out the above-described method. Some embodiments use a computer-readable medium to store the data structure and/or instructions to execute the method.

Abstract translation: 本发明提供一种用于表示准周期（“qp”）波形的系统和方法，包括表示qp波形的多个有限分解，其中每个分解包括第一和第二振幅值和至少一个时间值。 在一些实施例中，每个分解被相位调整，使得多个有限分解的算术和重建qp波形。 这些分解被存储到具有多个属性的数据结构中。 可选地，这些属性用于重建qp波形，或者可以通过使用各种模式识别技术来确定qp波的图案或特征。 一些实施例提供使用软件，嵌入式硬件或固件来执行上述方法的系统。 一些实施例使用计算机可读介质来存储用于执行该方法的数据结构和/或指令。