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    Method and System for Deferring Loudness Adjustments of Audio Components
    11.
    发明公开
    Method and System for Deferring Loudness Adjustments of Audio Components 审中-公开

    公开(公告)号：US20240105195A1

    公开(公告)日：2024-03-28

    申请号：US18471156

    申请日：2023-09-20

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte ,  Dipanjan Sen

    IPC: G10L19/16 ,  G10L19/008 ,  G10L25/51 ,  H04S7/00

    CPC classification number: G10L19/167 ,  G10L19/008 ,  G10L25/51 ,  H04S7/30 ,  H04S2400/11 ,  H04S2400/13

    Abstract: A method that includes receiving a bitstream that includes: a first signal of a first audio component associated with an audio scene, a first target loudness, and a first source loudness determined by an encoder side based on the first signal, and a second signal of a second audio component associated with the scene, a second target loudness, and a second source loudness determined by the encoder side based on the second signal; determining a first gain based on the first source and target loudness; determining a second gain based on the second source and target loudness; producing a first gain-adjusted signal by applying the first gain to the first signal; producing a second gain-adjusted signal by applying the second gain to the second signal; and producing the scene that includes the first and second audio components by combining the gain-adjusted audio signals into a group of signals.

    CHANNEL-ALIGNED AUDIO CODING
    13.
    发明公开
    CHANNEL-ALIGNED AUDIO CODING 审中-公开

    公开(公告)号：US20230335140A1

    公开(公告)日：2023-10-19

    申请号：US18301157

    申请日：2023-04-14

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte

    IPC: G10L19/005 ,  G10L19/00

    CPC classification number: G10L19/005 ,  G10L19/0017

    Abstract: A decoder-side method for outputting several audio channels of a sound program is described. An audio channel of the sound program, a residual signal, a gain parameter, and a delay parameter are received, for example within a bitstream. The audio channel is adjusted in accordance with the gain parameter and the delay parameter, to produce an adjusted audio signal, and is then combined with the residual signal to produce a combined signal. The audio channel is output as a first audio channel of the sound program for playback, while the combined signal is output as a second audio channel of the sound program. Other aspects are also described and claimed.

    Encoded audio metadata-based equalization
    15.
    发明授权
    Encoded audio metadata-based equalization 有权

    公开(公告)号：US10699726B2

    公开(公告)日：2020-06-30

    申请号：US15940912

    申请日：2018-03-29

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte

    IPC: G10L19/26 ,  G10L19/008 ,  G10L19/16 ,  H04S7/00 ,  G11B27/031 ,  G11B27/32 ,  H04S3/00

    Abstract: A system for producing an encoded digital audio recording has an audio encoder that encodes a digital audio recording having a number of audio channels or audio objects. An equalization (EQ) value generator produces a sequence of EQ values which define EQ filtering that is to be applied when decoding the encoded digital audio recording, wherein the EQ filtering is to be applied to a group of one or more of the audio channels or audio objects of the recording independent of any downmix. A bitstream multiplexer combines the encoded digital audio recording with the sequence of EQ values, the latter as metadata associated with the encoded digital audio recording. Other embodiments are also described including a system for decoding the encoded audio recording.

    ENCODED AUDIO EXTENDED METADATA-BASED DYNAMIC RANGE CONTROL
    16.
    发明申请
    ENCODED AUDIO EXTENDED METADATA-BASED DYNAMIC RANGE CONTROL 审中-公开

    公开(公告)号：US20180218742A1

    公开(公告)日：2018-08-02

    申请号：US15828087

    申请日：2017-11-30

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte

    IPC: G10L19/008 ,  H04S3/00

    CPC classification number: G10L19/008 ,  H04S3/008 ,  H04S2400/13 ,  H04S2400/15 ,  H04S2420/07

    Abstract: An audio encoder encodes a digital audio recording having a number of audio channels or audio objects. A Dynamic Range Control (DRC) processor produces a sequence of encoder DRC gain values, by applying a selected one of a number of DRC characteristics to a group of one or more of the audio channels or audio objects. The encoder DRC gain values are to be applied to adjust the group of audio channels or audio objects, upon decoding them from the encoded digital audio recording. A bitstream multiplexer combines a) the encoded digital audio recording with b) the sequence of encoder DRC gain values, an indication of the selected DRC characteristic, and an indication of an alternate DRC characteristic, the latter as metadata associated with the encoded digital audio recording. Other embodiments are also described including a system for decoding the encoded audio recording and performing DRC adjustment upon it.

    Deferred loudness adjustment for dynamic range control
    18.
    发明授权
    Deferred loudness adjustment for dynamic range control 有权

    公开(公告)号：US12248731B2

    公开(公告)日：2025-03-11

    申请号：US18403432

    申请日：2024-01-03

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte

    IPC: G06F3/16 ,  H04R3/04

    Abstract: A bitstream is obtained by a decoder side, that contains an encoded version of an audio signal and an instantaneous loudness sequence of the audio signal. The instantaneous loudness sequence has not been loudness normalized. A dynamic range control, DRC, gain sequence is produced by applying the instantaneous loudness sequence to a DRC characteristic, with loudness normalization. The DRC gain sequence is applied to the decoded audio signal. Other aspects are also described and claimed.

    Method and System For Efficiently Encoding Scene Positions
    19.
    发明公开
    Method and System For Efficiently Encoding Scene Positions 审中-公开

    公开(公告)号：US20240114310A1

    公开(公告)日：2024-04-04

    申请号：US18471796

    申请日：2023-09-21

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte ,  Dipanjan Sen

    IPC: H04S7/00

    CPC classification number: H04S7/303

    Abstract: A method that includes receiving a bitstream that comprises: an encoded version of an audio signal that is associated with a sound source that is within a first 3D scene, a scene tree structure that includes an origin of the first scene relative to an origin of a second scene, and a position of the sound source within the first scene relative to the origin of the first scene, wherein the position references the origin of the first scene using an identifier, wherein the scene tree structure defines an initial configuration of the sound source with respect to the first and second scenes; determining a position of a listener; producing a set of spatially rendered audio signals by spatially rendering the audio signal according to the position of the sound source with respect to the position of the listener; and using the spatially rendered audio signals to drive speakers.

    Deferred loudness adjustment for dynamic range control
    20.
    发明授权
    Deferred loudness adjustment for dynamic range control 有权

    公开(公告)号：US11907611B2

    公开(公告)日：2024-02-20

    申请号：US17501839

    申请日：2021-10-14

    Applicant: Apple Inc.

    Inventor： Frank Baumgarte

    IPC: G06F3/16 ,  H04R3/04

    CPC classification number: G06F3/165 ,  G06F3/162 ,  H04R3/04 ,  H04R2430/01

    Abstract: A bitstream is obtained by a decoder side, that contains an encoded version of an audio signal and an instantaneous loudness sequence of the audio signal. The instantaneous loudness sequence has not been loudness normalized. A dynamic range control, DRC, gain sequence is produced by applying the instantaneous loudness sequence to a DRC characteristic, with loudness normalization. The DRC gain sequence is applied to the decoded audio signal. Other aspects are also described and claimed.

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