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    Spectral translation/folding in the subband domain
    91.
    发明授权
    Spectral translation/folding in the subband domain 有权

    公开(公告)号：US10311882B2

    公开(公告)日：2019-06-04

    申请号：US15988135

    申请日：2018-05-24

    Applicant: Dolby International AB

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

    IPC: G06F17/00 ,  G10L19/02 ,  G10L21/038 ,  G10L19/26 ,  G10L19/00

    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.

    Decoding method and decoder for dialog enhancement
    92.
    发明授权
    Decoding method and decoder for dialog enhancement 有权

    公开(公告)号：US10170131B2

    公开(公告)日：2019-01-01

    申请号：US15513543

    申请日：2015-09-30

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Jeroen Koppens ,  Per Ekstrand

    IPC: G10L21/02 ,  G10L21/0316 ,  H04S3/00 ,  G10L19/008

    Abstract: There is provided a method for enhancing dialog in a decoder of an audio system. The method comprises receiving a plurality of downmix signals being a downmix of a larger plurality of channels; receiving parameters for dialog enhancement being defined with respect to a subset of the plurality of channels that is downmixed into a subset of the plurality of downmix signals; upmixing the subset of downmix signals parametrically in order to reconstruct the subset of the plurality of channels with respect to which the parameters for dialog enhancement are defined; applying dialog enhancement to the subset of the plurality of channels with respect to which the parameters for dialog enhancement are defined using the parameters for dialog enhancement to provide at least one dialog enhanced signal; and subjecting the at least one dialog enhanced signal to mixing to provide dialog enhanced versions of the subset of downmix signals.

    Efficient combined harmonic transposition
    94.
    发明授权
    Efficient combined harmonic transposition 有权

    公开(公告)号：US09881597B2

    公开(公告)日：2018-01-30

    申请号：US14882559

    申请日：2015-10-14

    Applicant: Dolby International AB

    Inventor： Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

    IPC: G10L19/14 ,  G10H1/00 ,  G10L21/038 ,  G10L19/26 ,  G10H1/12 ,  G10L21/0388

    CPC classification number: G10H1/0091 ,  G10H1/125 ,  G10H2210/311 ,  G10L19/265 ,  G10L21/038 ,  G10L21/0388

    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≧1; wherein the transposition order P is different from the resolution factor F.

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