公开(公告)号：US20090319259A1

公开(公告)日：2009-12-24

申请号：US12490969

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.

公开(公告)号：US07003451B2

公开(公告)日：2006-02-21

申请号：US09987475

申请日：2001-11-14

Applicant: Kristofer Kjörling ,  Per Ekstrand ,  Fredrik Henn ,  Lars Villemoes

Inventor： Kristofer Kjörling ,  Per Ekstrand ,  Fredrik Henn ,  Lars Villemoes

IPC: G10L11/06

CPC classification number: 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 adaptive filtering to reduce artifacts due to different tonal characteristics in different frequency ranges of an audio signal upon which HFR is performed. Tie present invention is applicable to both speech coding and natural audio coding systems.

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。 它利用自适应滤波来减少因执行HFR的音频信号的不同频率范围内的不同音调特性引起的伪影。 本发明适用于语音编码和自然音频编码系统。

公开(公告)号：US20060031064A1

公开(公告)日：2006-02-09

申请号：US11246283

申请日：2005-10-11

Applicant: Lars Liljeryd ,  Kristofer Kjorling ,  Per Ekstrand ,  Fredrik Henn

Inventor： Lars Liljeryd ,  Kristofer Kjorling ,  Per Ekstrand ,  Fredrik Henn

IPC: G10L19/04

CPC classification number: G10L19/06 ,  G10L19/0208 ,  G10L19/022 ,  G10L19/035 ,  G10L21/038 ,  G10L25/18

Abstract: The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.

Abstract translation: 本发明提供了一种用于频谱包络编码的新方法和装置。 本发明教导了如何执行和紧凑地发送包络表示的时间/频率映射，并且还使用自适应时间/频率方向编码有效地对频谱包络数据进行编码。 该方法适用于自然音频编码和语音编码系统，并且特别适用于使用SBR [WO 98/57436]或其他高频重建方法的编码器。

公开(公告)号：US06708145B1

公开(公告)日：2004-03-16

申请号：US09647057

申请日：2000-12-20

Applicant: Lars Gustaf Liljeryd ,  Kristofer Kjorling ,  Per Ekstrand ,  Fredrik Henn

Inventor： Lars Gustaf Liljeryd ,  Kristofer Kjorling ,  Per Ekstrand ,  Fredrik Henn

IPC: G10L1902

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：US09792915B2

公开(公告)日：2017-10-17

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 ,  G10L19/02 ,  G10L21/038 ,  G10L21/04

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.

公开(公告)号：US09305557B2

公开(公告)日：2016-04-05

申请号：US13604336

申请日：2012-09-05

Applicant: Frederik Nagel ,  Sascha Disch ,  Stephan Wilde ,  Lars Villemoes ,  Per Ekstrand

Inventor： Frederik Nagel ,  Sascha Disch ,  Stephan Wilde ,  Lars Villemoes ,  Per Ekstrand

IPC: G10L19/08 ,  G10L19/008 ,  G10L19/02 ,  G10L21/038 ,  G10L21/04

CPC classification number: G10L19/008 ,  G10L19/0204 ,  G10L21/038 ,  G10L21/04

Abstract: Apparatus for processing an audio signal to generate a bandwidth extended signal having a high frequency part and a low frequency part using parametric data for the high frequency part, the parametric data relating to frequency bands of the high frequency part includes a patch border calculator for calculating a patch border such that the patch border coincides with a frequency band border of the frequency bands. The apparatus further includes a patcher for generating a patched signal using the audio signal and the patch border.

Abstract translation: 用于处理音频信号以使用高频部分的参数数据产生具有高频部分和低频部分的带宽扩展信号的装置，与高频部分的频带有关的参数数据包括用于计算的频块边界计算器 贴片边界使得贴片边界与频带的频带边界重合。 该装置还包括一个修补器，用于使用音频信号和补片边界产生修补信号。

公开(公告)号：US09236061B2

公开(公告)日：2016-01-12

申请号：US12881821

申请日：2010-09-14

Applicant: Per Ekstrand ,  Lars Villemoes

Inventor： Per Ekstrand ,  Lars Villemoes

IPC: G10L21/04 ,  G10L19/022 ,  G10L21/038

CPC classification number: G10L19/022 ,  G10L19/0212 ,  G10L19/24 ,  G10L21/038 ,  G10L21/04

Abstract: The present invention relates to transposing signals in time and/or frequency and in particular to coding of audio signals. More particular, the present invention relates to high frequency reconstruction (HFR) methods including a frequency domain harmonic transposer. A method and system for generating a transposed output signal from an input signal using a transposition factor T is described. The system comprises an analysis window of length La, extracting a frame of the input signal, and an analysis transformation unit of order M transforming the samples into M complex coefficients. M is a function of the transposition factor T. The system further comprises a nonlinear processing unit altering the phase of the complex coefficients by using the transposition factor T, a synthesis transformation unit of order M transforming the altered coefficients into M altered samples, and a synthesis window of length Ls, generating a frame of the output signal.

Abstract translation: 本发明涉及在时间和/或频率上转置信号，特别涉及音频信号的编码。 更具体地，本发明涉及包括频域谐波转移器的高频重构（HFR）方法。 描述了使用转置因子T从输入信号生成转置输出信号的方法和系统。 该系统包括长度为La的分析窗口，提取输入信号的帧，以及将样本变换为M个复系数的阶数M的分析变换单元。 M是转置因子T的函数。该系统还包括通过使用转置因子T来改变复系数的相位的非线性处理单元，将改变的系数转换为M个改变的样本的阶数M的合成变换单元，以及 合成窗口长度Ls，产生输出信号的帧。

公开(公告)号：US08543385B2

公开(公告)日：2013-09-24

申请号：US13460789

申请日：2012-04-30

Applicant: Lars G. Liljeryd ,  Kristofer Kjoerlink ,  Per Ekstrand ,  Frederik Henn

Inventor： Lars G. Liljeryd ,  Kristofer Kjoerlink ,  Per Ekstrand ,  Frederik Henn

IPC: G10L19/00 ,  G10L19/14

CPC classification number: G10L19/028 ,  G10L19/035 ,  G10L19/06 ,  G10L19/26 ,  G10L19/265 ,  G10L21/038 ,  G10L25/18

Abstract: The present proposes new methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR). It addresses the problem of insufficient noise contents in a reconstructed highband, by Adaptive Noise-floor Addition. It also introduces new methods for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The present invention is applicable to both speech coding and natural audio coding systems.

Abstract translation: 本发明提出了利用高频重建（HFR）来增强源编码系统的新方法和装置。 它通过自适应噪声层加法解决了重构高频带中噪声含量不足的问题。 它还通过限制不需要的噪声，包络调整放大因子的插值和平滑来介绍新的增强性能的方法。 本发明适用于语音编码和自然音频编码系统。

公开(公告)号：US08543232B2

公开(公告)日：2013-09-24

申请号：US13460797

申请日：2012-04-30

Applicant: Lars Liljeryd ,  Per Ekstrand ,  Fredrik Henn ,  Kristofer Kjoerling

Inventor： Lars Liljeryd ,  Per Ekstrand ,  Fredrik Henn ,  Kristofer Kjoerling

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. This is accomplished by means of frequency translation in the frequency domain with spectral envelope adjustment in the same domain. The proposed invention offers a low-complexity HFR method useful in speech and natural audio coding applications.

Abstract translation: 本发明涉及使用频率转换或折叠或其组合来改进高频重建（HFR）技术的新方法和装置。 本发明适用于音频源编码系统。 这是通过在频域中的频率转换并且在相同的域中进行频谱包络调整来实现的。 所提出的发明提供了一种在语音和自然音频编码应用中有用的低复杂度HFR方法。

公开(公告)号：US20130058498A1

公开(公告)日：2013-03-07

申请号：US13604313

申请日：2012-09-05

Applicant: Sascha Disch ,  Frederik Nagel ,  Stephan Wilde ,  Lars Villemoes ,  Per Ekstrand

Inventor： Sascha Disch ,  Frederik Nagel ,  Stephan Wilde ,  Lars Villemoes ,  Per Ekstrand

IPC: H04R1/40

CPC classification number: G10L19/0208 ,  G10L19/022 ,  G10L19/16 ,  G10L19/26 ,  G10L21/038

Abstract: An apparatus for generating a bandwidth extended audio signal from an input signal, includes a patch generator for generating one or more patch signals from the input signal, wherein the patch generator is configured for performing a time stretching of subband signals from an analysis filterbank, and wherein the patch generator further includes a phase adjuster for adjusting phases of the subband signals using a filterbank-channel dependent phase correction.

Abstract translation: 一种用于从输入信号产生带宽扩展音频信号的装置，包括用于从所述输入信号产生一个或多个贴片信号的贴片发生器，其中所述贴片发生器被配置为执行来自分析滤波器组的子带信号的时间拉伸，以及 其中所述补丁发生器还包括相位调整器，用于使用滤波器组信道相关相位校正来调整所述子带信号的相位。