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    Corrective digital filter providing subdivision of a signal into several components of different frequency ranges
    11.
    发明授权
    Corrective digital filter providing subdivision of a signal into several components of different frequency ranges 失效
    纠正数字滤波器提供将信号细分为不同频率范围的几个组件

    公开(公告)号：US4827443A

    公开(公告)日：1989-05-02

    申请号：US84338

    申请日：1987-08-10

    Applicant: Klaus Meerkotter ,  Ingo Kunold

    Inventor： Klaus Meerkotter ,  Ingo Kunold

    IPC: H03H17/02 ,  G06F7/38

    CPC classification number: H03H17/0201

    Abstract: A wave digital filter has one input set to zero and a signal to be distortion-compensated or simply to be subdivided into signals occupying different frequency ranges is supplied at the other input. The attenuation/frequency characteristics of the respective paths from the signal input of the filter to the respective outputs have transmission functions that are complementary to each other. Further subdivision into frequency sub-bands is provided by cascading another such wave digital filter at one or both outputs of the first wave digital filter. The coefficients (g) of the wave digital filters can be used for control purposes. The several outputs of cascaded filters are multiplied by weighting factors and thereafter added together to provide an output compensated against variation of attenuation with respect to frequency to which the input signal has been subjected.

    Abstract translation: 波数字滤波器将一个输入设置为零，另一个输入端提供要被失真补偿的信号或简单地分为占用不同频率范围的信号。 从滤波器的信号输入到各个输出的相应路径的衰减/频率特性具有彼此互补的传输函数。 通过在第一波数字滤波器的一个或两个输出处级联另一个这样的数字滤波器来提供进一步细分为频率子带。 波数字滤波器的系数（g）可用于控制目的。 级联滤波器的多个输出乘以加权因子，然后加在一起，以提供相对于输入信号已经经受的频率的衰减变化补偿的输出。

    Method and apparatus for signal filtering and for improving properties of electronic devices
    12.
    发明授权
    Method and apparatus for signal filtering and for improving properties of electronic devices 有权

    公开(公告)号：US09917570B2

    公开(公告)日：2018-03-13

    申请号：US15271819

    申请日：2016-09-21

    Applicant: Avatekh, Inc.

    Inventor： Alexei V. Nikitin

    IPC: H03M1/84 ,  H03M1/88 ,  H03H17/02 ,  H03H7/01 ,  H03H11/12 ,  H03H21/00 ,  H03M1/12 ,  H03H11/24

    CPC classification number: H03H17/0219 ,  H03H7/0153 ,  H03H11/1256 ,  H03H11/1291 ,  H03H11/24 ,  H03H17/0201 ,  H03H21/0001 ,  H03H21/0016 ,  H03H2210/043 ,  H03M1/1235

    Abstract: The present invention relates to nonlinear signal processing, and, in particular, to adaptive nonlinear filtering of real-, complex-, and vector-valued signals utilizing analog Nonlinear Differential Limiters (NDLs), and to adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. More generally, this invention relates to methods, processes and apparatus for real-time measuring and analysis of variables, and to generic measurement systems and processes. This invention also relates to methods and corresponding apparatus for measuring which extend to different applications and provide results other than instantaneous values of variables. The invention further relates to post-processing analysis of measured variables and to statistical analysis. The NDL-based filtering method and apparatus enable improvements in the overall properties of electronic devices including, but not limited to, improvements in performance, reduction in size, weight, cost, and power consumption, and, in particular for wireless devices, NDLs enable improvements in spectrum usage efficiency.

    Complex exponential modulated filter bank for high frequency reconstruction
    17.
    发明授权
    Complex exponential modulated filter bank for high frequency reconstruction 有权
    用于高频重建的复指数调制滤波器组

    公开(公告)号：US09583118B1

    公开(公告)日：2017-02-28

    申请号：US15353860

    申请日：2016-11-17

    Applicant: Dolby International AB

    Inventor： Per Ekstrand

    IPC: G10L19/26 ,  G10L19/02 ,  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: An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

    Abstract translation: 公开了用于滤波和执行音频信号的高频重建的装置和方法。 该装置包括分析滤波器组，高频重建器和合成滤波器组。 分析滤波器组接收实时的时域输入音频样本并生成复值子带样本。 高频重建器修改至少一些复值子带样本。 合成滤波器组接收经修改的复值子带样本并生成时域输出音频样本。 分析滤波器组包括分析滤波器，其是具有任意相移的原型滤波器的复指数调制版本。

    Low Delay Modulated Filter Bank
    18.
    发明申请
    Low Delay Modulated Filter Bank 有权
    低延迟调制滤波器组

    公开(公告)号：US20160329062A1

    公开(公告)日：2016-11-10

    申请号：US15214694

    申请日：2016-07-20

    Applicant: Dolby International AB

    Inventor： Per Ekstrand ,  Nicholas Luke Appleton

    IPC: G10L19/26 ,  G10L19/02

    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 digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the document discloses a method comprising accessing a time-domain audio signal and applying a first filter bank to the time-domain audio signal, thereby producing a first plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The filter bank comprises an decimated modulated filter bank obtained from an asymmetric prototype filter. The method further comprises applying a second filter bank to at least a first subband of the first plurality of subbands of frequency-domain audio data, thereby producing a second plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The second modulated filter bank comprises an asymmetric modulated filter bank which includes no decimation. The method further comprises outputting at least the second plurality of subbands of frequency domain audio data.

    Abstract translation: 该文件涉及调制数字滤波器组，以及用于设计这种滤波器组的方法和系统。 特别地，本文件公开了一种方法，包括访问时域音频信号并将第一滤波器组应用于时域音频信号，从而产生频域音频数据的第一多个子带，其代表至少部分 音频信号。 滤波器组包括从不对称原型滤波器获得的抽取调制滤波器组。 该方法还包括将第二滤波器组应用于频域音频数据的第一多个子带中的至少第一子带，从而产生表示音频的至少一部分的频域音频数据的第二多个子带 信号。 第二调制滤波器组包括不包括抽取的不对称调制滤波器组。 该方法还包括至少输出频域音频数据的第二多个子带。

    Low Delay Modulated Filter Bank
    19.
    发明申请
    Low Delay Modulated Filter Bank 有权

    公开(公告)号：US20150333733A1

    公开(公告)日：2015-11-19

    申请号：US14807554

    申请日：2015-07-23

    Applicant: Dolby International AB

    Inventor： Per Ekstrand

    IPC: 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.

    SIGNAL DECOMPOSITION, ANALYSIS AND RECONSTRUCTION
    20.
    发明申请
    SIGNAL DECOMPOSITION, ANALYSIS AND RECONSTRUCTION 有权
    信号分解，分析与重构

    公开(公告)号：US20110313760A1

    公开(公告)日：2011-12-22

    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: G10L19/14

    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。

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