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    PARAMETRIC RECONSTRUCTION OF AUDIO SIGNALS
    3.
    发明申请
    PARAMETRIC RECONSTRUCTION OF AUDIO SIGNALS 审中-公开

    公开(公告)号：US20190325885A1

    公开(公告)日：2019-10-24

    申请号：US16363099

    申请日：2019-03-25

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Lars VILLEMOES ,  Heidi-Maria LEHTONEN ,  Heiko PURNHAGEN ,  Toni HIRVONEN

    IPC: G10L19/16 ,  G10L19/26 ,  G10L19/008 ,  H04S5/00

    Abstract: An encoding system encodes an N-channel audio signal (X), wherein N≥3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters ({tilde over (C)},{tilde over (P)}). In a decoding system, a decorrelating section outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section combines outputs from the upmix sections to obtain a reconstructed signal ({circumflex over (X)}) corresponding to the signal to be reconstructed.

    Reconstruction of Audio Scenes from a Downmix
    4.
    发明申请
    Reconstruction of Audio Scenes from a Downmix 审中-公开

    公开(公告)号：US20190311724A1

    公开(公告)日：2019-10-10

    申请号：US16380879

    申请日：2019-04-10

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Toni HIRVONEN ,  Heiko PURNHAGEN ,  Leif Jonas SAMUELSSON ,  Lars VILLEMOES

    IPC: G10L19/008 ,  H04S3/02 ,  G10L19/20 ,  G10L19/02 ,  G10L25/06 ,  H04S3/00 ,  H04S7/00 ,  H04S5/00

    Abstract: Audio objects are associated with positional metadata. A received downmix signal comprises downmix channels that are linear combinations of one or more audio objects and are associated with respective positional locators.In a first aspect, the downmix signal, the positional metadata and frequency-dependent object gains are received. An audio object is reconstructed by applying the object gain to an upmix of the downmix signal in accordance with coefficients based on the positional metadata and the positional locators.In a second aspect, audio objects have been encoded together with at least one bed channel positioned at a positional locator of a corresponding downmix channel. The decoding system receives the downmix signal and the positional metadata of the audio objects. A bed channel is reconstructed by suppressing the content representing audio objects from the corresponding downmix channel on the basis of the positional locator of the corresponding downmix channel.

    DECORRELATOR STRUCTURE FOR PARAMETRIC RECONSTRUCTION OF AUDIO SIGNALS
    8.
    发明申请
    DECORRELATOR STRUCTURE FOR PARAMETRIC RECONSTRUCTION OF AUDIO SIGNALS 有权
    参数重构音频信号的装饰结构

    公开(公告)号：US20160261967A1

    公开(公告)日：2016-09-08

    申请号：US15029023

    申请日：2014-10-21

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Lars VILLEMOES ,  Toni HIRVONEN ,  Heiko PURNHAGEN

    IPC: H04S7/00 ,  G10L19/002 ,  G10L25/21 ,  G10L19/008

    CPC classification number: H04S7/30 ,  G10L19/002 ,  G10L19/008 ,  G10L25/21 ,  H04S2400/03 ,  H04S2420/03

    Abstract: An encoding system encodes multiple audio signals (X) as a downmix signal (Y) together with wet and dry upmix coefficients (P, C). In a decoding system, a pre-multiplier (101) computes an intermediate signal (W) by mapping the downmix signal linearly in accordance with a first set of coefficients (Q); a decorrelating section (102) outputs a decorrelated signal (Z) based on the intermediate signal; a wet upmix section (103) computes a wet upmix signal by mapping the decorrelated signal linearly in accordance with the wet upmix coefficients; a dry upmix section (104) computes a dry upmix signal by mapping the downmix signal linearly in accordance with the dry upmix coefficients; a combining section (105) provides a multidimensional reconstructed signal (X) by combining the wet and dry upmix signals; and a converter (106) computes the first set of coefficients based on the wet and dry upmix coefficients and supplies this to the pre-multiplier.

    Abstract translation: 编码系统将多个音频信号（X）与湿和干混合系数（P，C）一起编码为下混合信号（Y）。 在解码系统中，预乘法器（101）通过根据第一组系数（Q）线性地映射下混合信号来计算中间信号（W）; 去相关部分（102）基于中间信号输出解相关信号（Z）; 湿混合部分（103）通过根据湿混合系数线性地映射去相关信号来计算湿上混信号; 干混合部分（104）通过根据干燥上混系数线性地映射下混合信号来计算干混合信号; 组合部分（105）通过组合湿和干混合信号来提供多维重建信号（X）; 并且转换器（106）基于湿和干混合系数来计算第一组系数，并将其提供给预乘数。

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