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公开(公告)号：US11232804B2
公开(公告)日：2022-01-25
申请号：US16628235
申请日：2018-07-03
Applicant: Dolby International AB
Inventor： Arijit Biswas , Michael Schug , Harald Mundt
IPC: G10L19/025 , G10L19/032 , G10L19/18 , H03M7/30 , H04B1/66 , H04H20/88
Abstract: The present disclosure relates to methods and apparatus for audio coding. A method of encoding a portion of an audio signal comprises determining whether the portion of the audio signal is likely to contain dense transient events, and if it is determined that the portion of the audio signal is likely to contain dense transient events, quantizing the portion of the audio signal using a quantization 5 mode that applies a substantially constant signal-to-noise ratio over frequency for the portion of the audio signal. The present disclosure further relates to a method of detecting dense transient events in a portion of an audio signal.
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2.发明授权公开(公告)号：US10373627B2
公开(公告)日：2019-08-06
申请号：US15915405
申请日：2018-03-08
Inventor： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC: G10L19/00 , G10L21/0232 , G10L25/18 , G10L21/034 , H04B1/66 , G10L19/008 , G10L19/02 , G10L19/032 , G10L25/45 , H03G7/00
Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
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公开(公告)号：US09984695B2
公开(公告)日：2018-05-29
申请号：US15494195
申请日：2017-04-21
Applicant: DOLBY INTERNATIONAL AB
Inventor： Robin Thesing , Michael Schug
IPC: G10L19/008 , G10L19/16 , G10L19/028
CPC classification number: G10L19/008 , G10L19/0204 , G10L19/028 , G10L19/167 , G10L21/0388
Abstract: The present document relates to the technical field of audio coding, decoding and processing. It specifically relates to methods of recovering high frequency content of an audio signal from low frequency content of the same audio signal in an efficient manner. A method for determining a first banded tonality value for a first frequency subband of an audio signal is described. The first banded tonality value is used for approximating a high frequency component of the audio signal based on a low frequency component of the audio signal. The method comprises determining a set of transform coefficients in a corresponding set of frequency bins based on a block of samples of the audio signal; determining a set of bin tonality values for the set of frequency bins using the set of transform coefficients, respectively; and combining a first subset of two or more of the set of bin tonality values for two or more corresponding adjacent frequency bins of the set of frequency bins lying within the first frequency subband, thereby yielding the first banded tonality value for the first frequency subband.
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公开(公告)号：US09646622B2
公开(公告)日：2017-05-09
申请号：US14525536
申请日：2014-10-28
Inventor： Jeffrey Riedmiller , Harald Mundt , Michael Schug , Martin Wolters
CPC classification number: G10L19/22 , G10L19/02 , G10L19/0208 , G10L19/167 , G10L19/26 , H03G3/3089 , H03G3/32 , H03G7/007
Abstract: Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.
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5.发明授权Method and system for encoding audio data with adaptive low frequency compensation 有权用自适应低频补偿编码音频数据的方法和系统公开(公告)号：US09275649B2
公开(公告)日：2016-03-01
申请号：US14325130
申请日：2014-07-07
Inventor： Arijit Biswas , Vinay Melkote , Michael Schug , Grant A. Davidson , Mark S. Vinton
IPC: G10L19/00 , G10L19/028 , G10L19/032 , G10L19/26 , G10L19/02
CPC classification number: G10L19/028 , G10L19/0204 , G10L19/032 , G10L19/265
Abstract: A method for determining mantissa bit allocation of audio data values of frequency domain audio data to be encoded. The allocation method includes a step of determining masking values for the audio data values, including by performing adaptive low frequency compensation on the audio data of each frequency band of a set of low frequency bands of the audio data. The adaptive low frequency compensation includes steps of: performing tonality detection on the audio data to generate compensation control data indicative of whether each frequency band in the set of low frequency bands has prominent tonal content; and performing low frequency compensation on the audio data in each frequency band in the set of low frequency bands having prominent tonal content as indicated by the compensation control data, but not performing low frequency compensation on the audio data in any other frequency band in the set of low frequency bands.
Abstract translation: 一种用于确定要编码的频域音频数据的音频数据值的尾数位分配的方法。 分配方法包括通过对音频数据的一组低频带的每个频带的音频数据执行自适应低频补偿来确定音频数据值的屏蔽值的步骤。 所述自适应低频补偿包括以下步骤：对所述音频数据执行音调检测，以产生指示所述一组低频带中的每个频带是否具有突出的音调内容的补偿控制数据; 对由该补偿控制数据所表示的具有突出色调内容的低频带组中的每个频带中的音频数据执行低频补偿，而不对该组中的任何其它频带中的音频数据执行低频补偿 的低频带。
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Patent Agency Ranking
6.发明授权Hybrid encoding of higher frequency and downmixed low frequency content of multichannel audio 有权混合编码高频和低混频多频道内容的多声道音频公开(公告)号：US08804971B1
公开(公告)日：2014-08-12
申请号：US14010826
申请日：2013-08-27
Inventor： Phillip A. Williams , Michael Schug , Robin Thesing
IPC: H04R5/00
CPC classification number: G10L19/008 , G10L19/02
Abstract: A method for encoding a multichannel audio input signal, including steps of generating a downmix of low frequency components of a subset of channels of the input signal, waveform coding each channel of the downmix, thereby generating waveform coded, downmixed data, performing parametric encoding on at least some higher frequency components of each channel of the input signal, thereby generating parametrically coded data, and generating an encoded audio signal (e.g., an E-AC-3 encoded signal) indicative of the waveform coded, downmixed data and the parametrically coded data. Other aspects are methods for decoding such an encoded signal, and systems configured to perform any embodiment of the inventive method.
Abstract translation: 一种用于编码多声道音频输入信号的方法，包括以下步骤：产生输入信号的通道子集的低频分量的下混合，对下混频的每个通道进行波形编码，从而产生波形编码的下混合数据，对 输入信号的每个通道的至少一些较高频率分量，由此产生参数编码数据，并产生指示波形编码的下混合数据和参数编码的编码音频信号（例如，E-AC-3编码信号） 数据。 其他方面是用于对这样的编码信号进行解码的方法，以及被配置为执行本发明方法的任何实施例的系统。
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公开(公告)号：US11948592B2
公开(公告)日：2024-04-02
申请号：US18303919
申请日：2023-04-20
Inventor： Jeffrey Riedmiller , Harald Mundt , Michael Schug , Martin Wolters
CPC classification number: G10L19/22 , G10L19/02 , G10L19/0208 , G10L19/167 , G10L19/26 , H03G3/3089 , H03G3/32 , H03G7/007
Abstract: Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.
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8.发明申请公开(公告)号：US20200176008A1
公开(公告)日：2020-06-04
申请号：US16787502
申请日：2020-02-11
Inventor： Jeffrey Riedmiller , Harald Mundt , Michael Schug , Martin Wolters
Abstract: Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.
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9.发明申请公开(公告)号：US20190325886A1
公开(公告)日：2019-10-24
申请号：US16504076
申请日：2019-07-05
Inventor： Jeffrey Riedmiller , Harald Mundt , Michael Schug , Martin Wolters
Abstract: Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.
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10.发明申请公开(公告)号：US20180197561A1
公开(公告)日：2018-07-12
申请号：US15914917
申请日：2018-03-07
Inventor： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC: G10L21/0232 , G10L19/032 , G10L19/02 , G10L19/008 , H04B1/66
CPC classification number: G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
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