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    AUDIO INTERFACE
    4.
    发明公开
    AUDIO INTERFACE 审中-公开

    公开(公告)号：US20240178810A1

    公开(公告)日：2024-05-30

    申请号：US18551260

    申请日：2022-03-24

    申请人： Audoo Limited

    发明人： Oliver James Clay

    IPC分类号： H03G3/30 ,  H03G7/00 ,  H03G11/00

    CPC分类号： H03G3/3005 ,  H03G7/002 ,  H03G7/007 ,  H03G11/002

    摘要： An audio interface system is disclosed that receives an audio signal from an audio line and outputs a normalised audio signal. An audio interface device of the audio interface system comprises a signal conditioning module, a gain module to apply a gain to the audio signal and an attenuation module to apply an attenuation to the audio signal to output the normalised audio signal. The audio interface device further comprises an interface configured to communicate the normalised signal to an external device. In response to determining that an amplitude of the audio signal does not meet a minimum amplitude requirement or exceed a maximum amplitude requirement, the signal conditioning module is to adjust the amplitude of the audio signal by applying the gain and/or attenuation to meet the requirement.

    EFFICIENT DRC PROFILE TRANSMISSION
    6.
    发明公开
    EFFICIENT DRC PROFILE TRANSMISSION 审中-公开

    公开(公告)号：US20240029748A1

    公开(公告)日：2024-01-25

    申请号：US18233330

    申请日：2023-08-14

    申请人： DOLBY INTERNATIONAL AB

    发明人： Holger HOERICH ,  Jeroen KOPPENS

    IPC分类号： G10L19/16 ,  H03G7/00 ,  G10L21/0364 ,  G10L19/26 ,  H03G9/00 ,  H04N21/233

    CPC分类号： G10L19/167 ,  H03G7/002 ,  H03G7/007 ,  G10L21/0364 ,  G10L19/26 ,  H03G9/005 ,  H04N21/233

    摘要： A method (600) for decoding an encoded audio signal (102) is described. The encoded audio signal (102) comprises a sequence of frames. Furthermore, the encoded audio signal (102) is indicative of a plurality of different dynamic range control (DRC) profiles for a corresponding plurality of different rendering modes. Different subsets of DRC profiles from the plurality of DRC profiles are comprised within different frames of the sequence of frames, such that two or more frames of the sequence of frames jointly comprise the plurality of DRC profiles. The method (600) comprises determining a first rendering mode from the plurality of different rendering modes; determining (609, 610) one or more DRC profiles from a subset of DRC profiles comprised within a current frame of the sequence of frames; determining (611) whether at least one of the one or more DRC profiles is applicable to the first rendering mode; selecting (604) a default DRC profile as a current DRC profile, if none of the one or more DRC profiles is applicable to the first rendering mode; wherein definition data of the default DRC profile is known at a decoder (100) for decoding the encoded audio signal (102); and decoding the current frame using the current DRC profile.

    Method for audio peak reduction using all-pass filter
    7.
    发明授权
    Method for audio peak reduction using all-pass filter 有权

    公开(公告)号：US11881829B2

    公开(公告)日：2024-01-23

    申请号：US17732417

    申请日：2022-04-28

    申请人： AAC Microtech (Changzhou) Co., Ltd. ,  AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) CO., LTD.

    发明人： Sebastian Schlecht ,  Leonardo Fierro ,  Vesa Valimaki ,  Juha Backman

    IPC分类号： H03G7/00

    CPC分类号： H03G7/007 ,  H03G7/004

    摘要： Provided is a method for audio peak reduction using an all-pass filter, including: determining a delay parameter m and a gain parameter g based on a formula (1):










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    ym,g(n) represents a processed signal with a time-domain response function and is calculated based on a formula (2): ym,g(n)=(hs*x)(n)(2), where hs represents an impulse response function, x (n) represents an input signal, and hs is calculated based on formula (3):










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    This method is widely used in the reproduction, storage and broadcasting of sound, and the computational complexity is small, which is a supplement to the traditional nonlinear compression algorithm.

    METHOD FOR AUDIO PEAK REDUCTION USING ALL-PASS FILTER
    8.
    发明公开
    METHOD FOR AUDIO PEAK REDUCTION USING ALL-PASS FILTER 审中-公开

    公开(公告)号：US20230353112A1

    公开(公告)日：2023-11-02

    申请号：US17732417

    申请日：2022-04-28

    申请人： AAC Microtech (Changzhou) Co., Ltd. ,  AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) CO., LTD.

    发明人： Sebastian Schlecht ,  Leonardo Fierro ,  Vesa Valimaki ,  Juha Backman

    IPC分类号： H03G7/00

    CPC分类号： H03G7/007 ,  H03G7/004

    摘要： Provided is a method for audio peak reduction using an all-pass filter, including: determining a delay parameter m and a gain parameter g based on a formula (1):










    arg
    ⁢

    min


    m
    ,
    g



    max
    n



    ❘
    "\[LeftBracketingBar]"



    y

    m
    ,
    g


    (
    n
    )


    ❘
    "\[RightBracketingBar]"



    ,




    (
    1
    )







    absolute peak map






    Y
    ⁡
    (

    m
    ,
    g

    )

    =


    max
    n



    ❘
    "\[LeftBracketingBar]"



    y

    m
    ,
    g


    (
    n
    )


    ❘
    "\[RightBracketingBar]"




    ,




    ym,g(n) represents a processed signal with a time-domain response function and is calculated based on a formula (2): ym,g(n)=(hs*x)(n)(2), where hs represents an impulse response function, x (n) represents an input signal, and hs is calculated based on formula (3):









    H
    S

    (
    z
    )

    =



    g
    +

    z

    -
    m




    1
    +

    gz

    -
    m




    .





    (
    3
    )







    This method is widely used in the reproduction, storage and broadcasting of sound, and the computational complexity is small, which is a supplement to the traditional nonlinear compression algorithm.

    Efficient DRC profile transmission
    10.
    发明授权
    Efficient DRC profile transmission 有权

    公开(公告)号：US11727948B2

    公开(公告)日：2023-08-15

    申请号：US17670459

    申请日：2022-02-13

    申请人： DOLBY INTERNATIONAL AB

    发明人： Holger Hoerich ,  Jeroen Koppens

    IPC分类号： G10L19/16 ,  H03G7/00 ,  G10L21/0364 ,  G10L19/26 ,  H03G9/00 ,  H04N21/233

    CPC分类号： G10L19/167 ,  G10L19/26 ,  G10L21/0364 ,  H03G7/002 ,  H03G7/007 ,  H03G9/005 ,  H04N21/233

    摘要： A method (600) for decoding an encoded audio signal (102) is described. The encoded audio signal (102) comprises a sequence of frames. Furthermore, the encoded audio signal (102) is indicative of a plurality of different dynamic range control (DRC) profiles for a corresponding plurality of different rendering modes. Different subsets of DRC profiles from the plurality of DRC profiles are comprised within different frames of the sequence of frames, such that two or more frames of the sequence of frames jointly comprise the plurality of DRC profiles. The method (600) comprises determining a first rendering mode from the plurality of different rendering modes; determining (609, 610) one or more DRC profiles from a subset of DRC profiles comprised within a current frame of the sequence of frames; determining (611) whether at least one of the one or more DRC profiles is applicable to the first rendering mode; selecting (604) a default DRC profile as a current DRC profile, if none of the one or more DRC profiles is applicable to the first rendering mode; wherein definition data of the default DRC profile is known at a decoder (100) for decoding the encoded audio signal (102); and decoding the current frame using the current DRC profile.