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公开(公告)号：US09559651B2
公开(公告)日：2017-01-31
申请号：US14225950
申请日：2014-03-26
Applicant: Apple Inc.
Inventor： Frank Baumgarte , Eric A. Allamanche , Stefan K. O. Strommer
IPC: H03G3/20 , H03G7/00 , G10L21/0316 , G10L19/008
CPC classification number: H03G3/20 , G10L19/008 , G10L21/0316 , H03G7/007
Abstract: An audio normalization gain value is applied to an audio signal to produce a normalized signal. The normalized signal is processed to compute dynamic range control (DRC) gain values in accordance with a selected one of several pre-defined DRC characteristics. The audio signal is encoded, and the DRC gain values are provided as metadata associated with the encoded audio signal. Several other embodiments are also described and claimed.
Abstract translation: 将音频归一化增益值应用于音频信号以产生归一化信号。 处理归一化信号以根据几个预定义的DRC特性中选择的一个来计算动态范围控制（DRC）增益值。 音频信号被编码，并且提供DRC增益值作为与编码的音频信号相关联的元数据。 还描述和要求保护的其它几个实施例。
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公开(公告)号：US11501789B2
公开(公告)日：2022-11-15
申请号：US16893114
申请日：2020-06-04
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.
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公开(公告)号：US20210211821A1
公开(公告)日：2021-07-08
申请号：US17128910
申请日：2020-12-21
Applicant: Apple Inc.
Inventor： Gaetan R. Lorho , Jonathan D. Sheaffer , Symeon Delikaris Manias , Frank Baumgarte
Abstract: Transfer functions can describe responses of microphones or ears to sounds at different locations on a sphere. The transfer functions can be compressed by determining, based on transfer functions, a) one or more basis transfer functions, and b) spherical harmonics coefficients that describe variations of the transfer functions with respect to spherical coordinates. Other aspects are described and claimed.
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公开(公告)号：US20210098004A1
公开(公告)日：2021-04-01
申请号：US16584706
申请日：2019-09-26
Applicant: Apple Inc.
Inventor： Dipanjan Sen , Frank Baumgarte , Juha O. Merimaa
IPC: G10L19/008 , H04S7/00 , H04S3/00
Abstract: A first layer of data having a first set of Ambisonic audio components can be decoded where the first set of Ambisonic audio components is generated based on ambience and one or more object-based audio signals. A second layer of data is decoded having at least one of the one or more object-based audio signals. One of the object-based audio signals is subtracted from the first set of Ambisonic audio components. The resulting Ambisonic audio components are rendered to generate a first set of audio channels. The one or more object-based audio signals are spatially rendered to generate a second set of audio channels. Other aspects are described and claimed.
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Patent Agency Ranking
公开(公告)号：US10785569B2
公开(公告)日：2020-09-22
申请号：US16456559
申请日：2019-06-28
Applicant: Apple Inc.
Inventor： Frank Baumgarte
Abstract: Dynamic loudness equalization of received audio content in a playback system, using metadata that includes instantaneous loudness values for the audio content. A playback level is derived from a user volume setting of the playback system, and is compared with a mixing level that is assigned to the audio content. Parameters are computed, that define an equalization filter that is filtering the audio content before driving a speaker with the filtered audio content, based on the instantaneous loudness values and the comparing of the playback level with the assigned mixing level. Other embodiments are also described and claimed.
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36.发明申请公开(公告)号：US20190327558A1
公开(公告)日：2019-10-24
申请号：US16456559
申请日：2019-06-28
Applicant: Apple Inc.
Inventor： Frank Baumgarte
Abstract: Dynamic loudness equalization of received audio content in a playback system, using metadata that includes instantaneous loudness values for the audio content. A playback level is derived from a user volume setting of the playback system, and is compared with a mixing level that is assigned to the audio content. Parameters are computed, that define an equalization filter that is filtering the audio content before driving a speaker with the filtered audio content, based on the instantaneous loudness values and the comparing of the playback level with the assigned mixing level. Other embodiments are also described and claimed.
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公开(公告)号：US20180218746A1
公开(公告)日：2018-08-02
申请号：US15940912
申请日：2018-03-29
Applicant: Apple Inc.
Inventor： Frank Baumgarte
IPC: G10L19/26 , G11B27/031 , G10L19/16 , G10L19/008 , H04S7/00 , 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.
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38.发明申请公开(公告)号：US20170094409A1
公开(公告)日：2017-03-30
申请号：US15275162
申请日：2016-09-23
Applicant: Apple Inc.
Inventor： Frank Baumgarte
CPC classification number: H04R3/04 , G06F3/165 , G10L19/00 , G10L19/167 , H03G5/165 , H03G7/007 , H04N21/8113 , H04N21/84 , H04R2430/01
Abstract: Dynamic loudness equalization of received audio content in a playback system, using metadata that includes instantaneous loudness values for the audio content. A playback level is derived from a user volume setting of the playback system, and is compared with a mixing level that is assigned to the audio content. Parameters are computed, that define an equalization filter that is filtering the audio content before driving a speaker with the filtered audio content, based on the instantaneous loudness values and the comparing of the playback level with the assigned mixing level. Other embodiments are also described and claimed.
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公开(公告)号：US20170032793A1
公开(公告)日：2017-02-02
申请号：US15217632
申请日：2016-07-22
Applicant: Apple Inc.
Inventor： Frank Baumgarte
IPC: G10L19/008
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.
Abstract translation: 音频编码器对具有多个音频通道或音频对象的数字音频记录进行编码。 动态范围控制（DRC）处理器通过将多个DRC特性中选择的一个应用于一个或多个音频通道或音频对象的组来产生编码器DRC增益值序列。 在编码数字音频记录中对编码器DRC增益值进行解码时，将应用编码器DRC增益值来调整音频通道或音频对象组。 比特流多路复用器将a）编码的数字音频记录与b）编码器DRC增益值的序列，所选择的DRC特性的指示以及替代DRC特性的指示，后者作为与编码的数字音频记录相关联的元数据 。 还描述了其他实施例，其包括用于对编码的音频记录进行解码并在其上执行DRC调整的系统。
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