公开(公告)号：US07483758B2

公开(公告)日：2009-01-27

申请号：US10296562

申请日：2001-05-23

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.

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。 所提出的发明适用于音频源编码系统，并提供显着降低的计算复杂度。 这通过在子带域中的频率转换或折叠来实现，优选地与同一域中的频谱包络调整集成。 进一步提出了不一致保卫带滤波的概念。 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，中等质量的HFR方法。

公开(公告)号：US07469206B2

公开(公告)日：2008-12-23

申请号：US10497450

申请日：2002-11-28

Applicant: Kristofer Kjörling ,  Per Ekstrand ,  Holger Hörich

Inventor： Kristofer Kjörling ,  Per Ekstrand ,  Holger Hörich

IPC: G10L19/00 ,  G10L21/00

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 (703a) 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 (703b) 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构（703a）来评估在解码器中HFR方法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（703b）并被发送到解码器，其中它与HFR单元的输出组合。

公开(公告)号：US07260520B2

公开(公告)日：2007-08-21

申请号：US10022526

申请日：2001-12-20

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

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

IPC: G10L19/14

CPC classification number: G10L21/038

Abstract: The present invention relates to a new method for enhancement of source coding systems using high-frequency reconstruction. The invention teaches that tonal signals can be classified as either pulse-train-like or non-pulse-train-like. Relying on this classification, significant improvements on the perceived audio quality can be obtained by adaptive switching of transposers. The invention shows that the so-switched transposers must have fundamental differences in their characteristics.

Abstract translation: 本发明涉及一种用于增强使用高频重构的源编码系统的新方法。 本发明教导了音调信号可以被分类为脉冲列式或非脉冲列式。 依靠这一分类，可以通过转换器的自适应切换获得感知音频质量的显着改进。 本发明表明，所谓的交换式转移器在其特征上必须具有根本的差异。

公开(公告)号：US07181389B2

公开(公告)日：2007-02-20

申请号：US11246283

申请日：2005-10-11

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

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

IPC: G10L21/00

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：US20050096917A1

公开(公告)日：2005-05-05

申请号：US10497450

申请日：2002-11-28

Applicant: Kristofer Kjorling ,  Per Ekstrand ,  Holger Horich

Inventor： Kristofer Kjorling ,  Per Ekstrand ,  Holger Horich

IPC: G10L19/02 ,  G10L19/07 ,  G10L19/24 ,  G10L21/02 ,  G10L21/038 ,  G10L19/00

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 utilising high frequency reconstruction (HFR). It utilises a detection mechanism (703a) 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 (703b) 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（703a）来评估在解码器中HFR方法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（703b）并且被发送到解码器，其中它与HFR单元的输出组合。