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    METHODS, APPARATUS AND SYSTEMS FOR DECOMPRESSING A HIGHER ORDER AMBISONICS (HOA) SIGNAL
    21.
    发明申请
    METHODS, APPARATUS AND SYSTEMS FOR DECOMPRESSING A HIGHER ORDER AMBISONICS (HOA) SIGNAL 有权

    公开(公告)号：US20250080934A1

    公开(公告)日：2025-03-06

    申请号：US18792869

    申请日：2024-08-02

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Sven KORDON ,  Alexander KRUEGER ,  Oliver WUEBBOLT

    IPC: H04S3/00 ,  G10L19/008 ,  G10L19/24 ,  H04S7/00

    Abstract: A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k−1)) and a frame of an ambient HOA component ({tilde over (C)}AMB(k−1)). The ambient HOA component ({tilde over (C)}AMB(k−1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cn(k−1)) in lower positions and second HOA coefficient sequences (cAMB,n(k−1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.

    METHODS AND APPARATUS FOR DECODING A COMPRESSED HOA SIGNAL
    23.
    发明公开
    METHODS AND APPARATUS FOR DECODING A COMPRESSED HOA SIGNAL 审中-公开

    公开(公告)号：US20230419975A1

    公开(公告)日：2023-12-28

    申请号：US18464505

    申请日：2023-09-11

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Sven KORDON ,  Alexander KRUEGER ,  Oliver WUEBBOLT

    IPC: G10L19/008 ,  H04S3/00 ,  G10L19/24

    CPC classification number: G10L19/008 ,  H04S3/008 ,  G10L19/24 ,  H04S2420/11 ,  H04S2400/01

    Abstract: Methods and apparatus for decoding a compressed Higher Order Ambisonics (HOA) representation of a sound or soundfield. The method may include receiving a bit stream containing the compressed HOA representation and decoding, based on a determination that there are multiple layers, the compressed HOA representation from the bitstream to obtain a sequence of decoded HOA representations. A first subset of the sequence of decoded HOA representations is determined based only on corresponding ambient HOA components. A second subset of the sequence of decoded HOA representations is determined based on corresponding ambient HOA components and corresponding predominant sound components. For a frame k, the sequence of decoded HOA representations are represented at least in part by








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    where ĉAMB,n(k−1) corresponds to the corresponding ambient HOA components and ĉPS,n(k−1) corresponds to the corresponding predominant sound components.

    METHODS, APPARATUS AND SYSTEMS FOR DECOMPRESSING A HIGHER ORDER AMBISONICS (HOA) SIGNAL
    25.
    发明申请
    METHODS, APPARATUS AND SYSTEMS FOR DECOMPRESSING A HIGHER ORDER AMBISONICS (HOA) SIGNAL 有权

    公开(公告)号：US20220377481A1

    公开(公告)日：2022-11-24

    申请号：US17864708

    申请日：2022-07-14

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Sven KORDON ,  Alexander KRUEGER ,  Oliver WUEBBOLT

    IPC: H04S3/00 ,  G10L19/008 ,  G10L19/24 ,  H04S7/00

    Abstract: A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k−1)) and a frame of an ambient HOA component ({tilde over (C)}AMB(k−1)). The ambient HOA component ({tilde over (C)}AMB(k−1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cn(k−1)) in lower positions and second HOA coefficient sequences (cAMB,n(k−1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.

    METHODS AND APPARATUS FOR DETERMINING FOR DECODING A COMPRESSED HOA SOUND REPRESENTATION
    26.
    发明申请
    METHODS AND APPARATUS FOR DETERMINING FOR DECODING A COMPRESSED HOA SOUND REPRESENTATION 有权

    公开(公告)号：US20220270620A1

    公开(公告)日：2022-08-25

    申请号：US17733757

    申请日：2022-04-29

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Sven KORDON ,  Alexander KRUEGER

    IPC: G10L19/008 ,  H04S7/00

    Abstract: When compressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (βe) of bits the HOA data frame representation (C(k)) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation (C(k)). Then the lowest integer number of bits is set to βe=┌log2(┌log2(√{square root over (KMAX)}·O)┐+1)┐.

    METHOD AND APPARATUS FOR PROCESSING SIGNALS OF A SPHERICAL MICROPHONE ARRAY ON A RIGID SPHERE USED FOR GENERATING AN AMBISONICS REPRESENTATION OF THE SOUND FIELD
    28.
    发明申请
    METHOD AND APPARATUS FOR PROCESSING SIGNALS OF A SPHERICAL MICROPHONE ARRAY ON A RIGID SPHERE USED FOR GENERATING AN AMBISONICS REPRESENTATION OF THE SOUND FIELD 有权
    用于处理用于产生声场的代表性的刚性球囊上的球形麦克风阵列的信号的方法和装置

    公开(公告)号：US20170070840A1

    公开(公告)日：2017-03-09

    申请号：US15357810

    申请日：2016-11-21

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Sven KORDON ,  Johann-Markus BATKE ,  Alexander KRUEGER ,  Mark R. P. THOMAS

    IPC: H04S7/00 ,  H04R3/00

    CPC classification number: H04S7/307 ,  H04R1/326 ,  H04R1/406 ,  H04R3/005 ,  H04R5/027 ,  H04R29/005 ,  H04R2201/401 ,  H04S3/002 ,  H04S2400/15 ,  H04S2420/11

    Abstract: Spherical microphone arrays capture a three-dimensional sound field (P(Ωc, t)) for generating an Ambisonics representation (Anm(t)), where the pressure distribution on the surface of the sphere is sampled by the capsules of the array. The impact of the microphones on the captured sound field is removed using the inverse microphone transfer function. The equalisation of the transfer function of the microphone array is a big problem because the reciprocal of the transfer function causes high gains for small values in the transfer function and these small values are affected by transducer noise. The invention minimises that noise by using a Wiener filter processing in the frequency domain, which processing is automatically controlled per wave number by the signal-to-noise ratio of the microphone array.

    Abstract translation: 球形麦克风阵列捕获用于产生Ambisonics表示（Anm（t））的三维声场（P（Ωc，t）），其中球体表面上的压力分布由阵列的胶囊取样。 使用反向麦克风传递功能可以消除麦克风对拍摄声场的影响。 麦克风阵列的传递函数的均衡是一个大问题，因为传递函数的倒数对传递函数中的小值造成高增益，这些小值受传感器噪声的影响。 本发明通过使用频域中的维纳滤波处理来最小化噪声，该处理根据麦克风阵列的信噪比自动控制每波数。

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