-
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
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：US08443026B2
公开(公告)日：2013-05-14
申请号：US12687801
申请日：2010-01-14
Applicant: Per Ekstrand , Lars Villemoes , Heiko Purnhagen
Inventor： Per Ekstrand , Lars Villemoes , Heiko Purnhagen
IPC: G06F17/10
CPC classification number: G10L19/008 , G10L19/0208
Abstract: An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.
Abstract translation: 一种用于使用第一实值子带信号和第二实值子带信号来处理多个实值子带信号以提供至少复值子带信号的装置包括多频带滤波器，用于提供中间实值子带 信号和用于通过组合来自多个实值子带信号和中间子带信号的实值子带信号来提供复值子带信号的计算器。
-
23.发明申请APPARATUS AND METHOD FOR PROCESSING AN INPUT AUDIO SIGNAL USING CASCADED FILTERBANKS 有权使用CASCAD FILTERBANK处理输入音频信号的装置和方法公开(公告)号：US20130090933A1
公开(公告)日：2013-04-11
申请号：US13604364
申请日：2012-09-05
Applicant: Lars Villemoes , Per Ekstrand , Sascha Disch , Frederik Nagel , Stephan Wilde
Inventor： Lars Villemoes , Per Ekstrand , Sascha Disch , Frederik Nagel , Stephan Wilde
IPC: G10L19/008
CPC classification number: G10L19/008 , G10L19/0204 , G10L21/038 , G10L21/04
Abstract: An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.
Abstract translation: 用于处理输入音频信号的装置依赖于级联的滤波器组，该级联具有用于从输入音频信号合成音频中间信号的合成滤波器组，输入音频信号由分析产生的多个第一子带信号表示 滤波器组，其中合成滤波器组的多个滤波器组信道小于分析滤波器组的信道数。 该装置还具有用于从音频中间信号产生多个第二子带信号的进一步的分析滤波器组，其中进一步的分析滤波器组具有与合成滤波器组的信道数不同的信道数，使得采样率 多个第二子带信号的子带信号与多个第一子带信号的第一子带信号的采样率不同。
-
公开(公告)号：US08412365B2
公开(公告)日：2013-04-02
申请号：US12703553
申请日：2010-02-10
Applicant: Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjorling
Inventor： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjorling
IPC: G06F17/00
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.
-
公开(公告)号：US08285771B2
公开(公告)日：2012-10-09
申请号：US12716777
申请日：2010-03-03
Applicant: Per Ekstrand , Lars Villemoes , Heiko Purnhagen
Inventor： Per Ekstrand , Lars Villemoes , Heiko Purnhagen
IPC: G06F17/10
CPC classification number: G10L19/008 , G10L19/0208
Abstract: An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.
-
Patent Agency Ranking
公开(公告)号：US08180818B2
公开(公告)日：2012-05-15
申请号：US12716739
申请日：2010-03-03
Applicant: Per Ekstrand , Lars Villemoes , Heiko Purnhagen
Inventor： Per Ekstrand , Lars Villemoes , Heiko Purnhagen
IPC: G06F17/10
CPC classification number: G10L19/0208
Abstract: An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.
Abstract translation: 一种用于使用第一实值子带信号和第二实值子带信号来处理多个实值子带信号以提供至少复值子带信号的装置包括多频带滤波器，用于提供中间实值子带 信号和用于通过组合来自多个实值子带信号和中间子带信号的实值子带信号来提供复值子带信号的计算器。
-
27.发明授权公开(公告)号：US08112284B2
公开(公告)日：2012-02-07
申请号：US12273782
申请日：2008-11-19
Applicant: Kristofer Kjörling , Per Ekstrand , Holger Hörich
Inventor： Kristofer Kjörling , Per Ekstrand , Holger Hörich
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes a detection mechanism on the encoder side to assess what parts of the spectrum will not be correctly reproduced by the HFR method in the decoder. Information on this is efficiently coded and sent to the decoder, where it is combined with the output of the HFR unit.
Abstract translation: 本发明提出了一种利用高频重构（HFR）来增强音频源编码系统的新方法和新装置。 它利用编码器侧的检测机制来评估解码器中HFR方法将不能正确地再现频谱的哪些部分。 关于此的信息被有效地编码并发送到解码器，其中它与HFR单元的输出组合。
-
28.发明授权Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting 有权通过自适应噪声底板加法和噪声替换限制来增强SBR和相关HFR编码方法的感知性能公开(公告)号：US08036881B2
公开(公告)日：2011-10-11
申请号：US12490990
申请日：2009-06-24
Applicant: Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
Inventor： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC: G10L19/00
CPC classification number: G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
Abstract: Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.
Abstract translation: 引入了利用高频重建（HFR）来增强源编码系统的方法和装置。 通过使用自适应噪声层加法，在重构的高频带中解决噪声含量不足的问题。 还引入了新的方法，通过限制不需要的噪声，包络调整放大因子的内插和平滑来增强性能。 所使用的方法和装置适用于语音编码和自然音频编码系统。
-
公开(公告)号：US20100228555A1
公开(公告)日：2010-09-09
申请号：US12716760
申请日：2010-03-03
Applicant: Per Ekstrand , Lars Villemoes , Heiko Purnhagen
Inventor： Per Ekstrand , Lars Villemoes , Heiko Purnhagen
IPC: G10L19/02
CPC classification number: G10L19/0208
Abstract: An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.
Abstract translation: 一种用于使用第一实值子带信号和第二实值子带信号来处理多个实值子带信号以提供至少复值子带信号的装置包括多频带滤波器，用于提供中间实值子带 信号和用于通过组合来自多个实值子带信号和中间子带信号的实值子带信号来提供复值子带信号的计算器。
-
30.发明申请Enhancing Perceptual Performance of SBR and Related HFR Coding Methods by Adaptive Noise-Floor Addition and Noise Substitution Limiting 有权通过自适应噪声增加和噪声替代限制提高SBR和相关HFR编码方法的感知性能公开(公告)号：US20090319280A1
公开(公告)日：2009-12-24
申请号：US12491001
申请日：2009-06-24
Applicant: Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
Inventor： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC: G10L21/00
CPC classification number: G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
Abstract: Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.
Abstract translation: 引入了利用高频重建（HFR）来增强源编码系统的方法和装置。 通过使用自适应噪声层加法，在重构的高频带中解决噪声含量不足的问题。 还引入了新的方法，通过限制不需要的噪声，包络调整放大因子的内插和平滑来增强性能。 所使用的方法和装置适用于语音编码和自然音频编码系统。
-
-
-
-
-
-
-
-
-
Search Results
65
records
(took 0.031 seconds)
