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1. 发明申请

US20180197561A1 COMPANDING SYSTEM AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 审中-公开
公开(公告)号：US20180197561A1
公开(公告)日：2018-07-12
申请号：US15914917
申请日：2018-03-07
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC分类号： G10L21/0232 , G10L19/032 , G10L19/02 , G10L19/008 , H04B1/66
CPC分类号： G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
摘要： 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.

2. 发明授权

US09947335B2 Companding apparatus and method to reduce quantization noise using advanced spectral extension 有权
公开(公告)号：US09947335B2
公开(公告)日：2018-04-17
申请号：US14762690
申请日：2014-04-01
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC分类号： G10L21/0232 , G10L21/034 , G10L25/18 , G10L25/45 , G10L19/032 , G10L19/008 , G10L19/02 , H04B1/66 , H03G7/00
CPC分类号： G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
摘要： 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 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.

3. 发明授权

US10373627B2 Companding system and method to reduce quantization noise using advanced spectral extension 有权
公开(公告)号：US10373627B2
公开(公告)日：2019-08-06
申请号：US15915405
申请日：2018-03-08
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC分类号： G10L19/00 , G10L21/0232 , G10L25/18 , G10L21/034 , H04B1/66 , G10L19/008 , G10L19/02 , G10L19/032 , G10L25/45 , H03G7/00
摘要： 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.

4. 发明授权

US09275649B2 Method and system for encoding audio data with adaptive low frequency compensation 有权
标题翻译：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
申请人： DOLBY LABORATORIES LICENSING CORPORATION , DOLBY INTERNATIONAL AB
发明人： Arijit Biswas , Vinay Melkote , Michael Schug , Grant A. Davidson , Mark S. Vinton
IPC分类号： G10L19/00 , G10L19/028 , G10L19/032 , G10L19/26 , G10L19/02
CPC分类号： G10L19/028 , G10L19/0204 , G10L19/032 , G10L19/265
摘要： 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.
摘要翻译：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。

5. 发明申请

US20140330556A1 LOW COMPLEXITY REPETITION DETECTION IN MEDIA DATA 审中-公开
标题翻译：媒体数据中的低复杂度重复检测
公开(公告)号：US20140330556A1
公开(公告)日：2014-11-06
申请号：US14360257
申请日：2012-12-10
申请人： DOLBY LABORATORIES LICENSING CORPORATION , DOLBY INTERNATIONAL AB
发明人： Barbara Resch , Regunathan Radhakrishnan , Arijit Biswas , Jonas Engdegard
IPC分类号： G10L19/00
CPC分类号： G10L19/00 , G10H1/0008
摘要： Low complexity detection of a time-wise position of a representative segment in media data is described. A subset of offset values is located in a set of offset values in media data using a first type of one or more types of features, which are extractable from (e.g., derivable from components of) the media data. The subset of offset values comprise values that are selected from the set of offset values based on one or more selection criteria. A set of candidate seed time points is identified based on the subset of offset values using a second type of the one or more types of features.
摘要翻译：描述媒体数据中代表性段的时间位置的低复杂度检测。偏移值的子集位于媒体数据的一组偏移值中，使用可从媒体数据的（例如，可从组件导出）的一个或多个类型的特征的第一类型。偏移值的子集包括从基于一个或多个选择标准的偏移值集合中选择的值。使用第二类型的一种或多种类型的特征，基于偏移值的子集来识别一组候选种子时间点。

6. 发明申请

US20140088978A1 FORENSIC DETECTION OF PARAMETRIC AUDIO CODING SCHEMES 有权
标题翻译：参考音频编码方案的审查
公开(公告)号：US20140088978A1
公开(公告)日：2014-03-27
申请号：US14116113
申请日：2012-04-30
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Harald H. Mundt , Arijit Biswas , Regunathan Radhakrishnan
IPC分类号： G10L19/00
CPC分类号： G10L19/00 , G10L19/008 , G10L21/02 , G10L21/038 , G10L25/03
摘要： The present document relates to audio forensics, notably the blind detection of traces of parametric audio encoding/decoding. In particular, the present document relates to the detection of parametric frequency extension audio coding, such as spectral band replication (SBR) or spectral extension (SPX), from uncompressed waveforms such as PCM (pulse code modulation) encoded waveforms. A method for detecting frequency extension coding history in a time domain audio signal is described. The method may comprise transforming the time domain audio signal into a frequency domain, thereby generating a plurality of subband signals in a corresponding plurality of subbands comprising low and high frequency subbands; determining a degree of relationship between subband signals in the low frequency subbands and subband signals in the high frequency subbands; wherein the degree of relationship is determined based on the plurality of subband signals; and determining frequency extension coding history if the degree of relationship is greater than a relationship threshold.
摘要翻译：本文件涉及音频取证，特别是盲目检测参数音频编码/解码的痕迹。特别地，本文件涉及从诸如PCM（脉冲编码调制）编码波形的未压缩波形检测参数频率扩展音频编码，例如频谱带复制（SBR）或频谱扩展（SPX）。描述了用于检测时域音频信号中的频率扩展编码历史的方法。该方法可以包括将时域音频信号变换成频域，由此在包括低频和高频子带的相应多个子带中产生多个子带信号; 确定低频子带中的子带信号与高频子带中的子带信号之间的关系程度; 其中所述关系度基于所述多个子带信号来确定; 以及如果所述关系度大于关系阈值，则确定频率扩展编码历史。

7. 发明申请

US20230049495A1 COMPANDING SYSTEM AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 有权
公开(公告)号：US20230049495A1
公开(公告)日：2023-02-16
申请号：US17820594
申请日：2022-08-18
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC分类号： G10L21/0232 , H04B1/66 , G10L19/02 , G10L19/008 , G10L25/18 , G10L19/032 , G10L21/034 , G10L25/45 , H03G7/00
摘要： 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.

8. 发明申请

US20210327445A1 METHOD AND APPARATUS FOR CONTROLLING ENHANCEMENT OF LOW-BITRATE CODED AUDIO 有权
公开(公告)号：US20210327445A1
公开(公告)日：2021-10-21
申请号：US17270053
申请日：2019-08-29
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Arijit Biswas , Jia Dai , Aaron Steven Master
IPC分类号： G10L19/24
摘要： Described herein is a method of low-bitrate coding of audio data and generating enhancement metadata for controlling audio enhancement of the low-bitrate coded audio data at a decoder side, including the steps of: (a) core encoding original audio data at a low bitrate to obtain encoded audio data; (b) generating enhancement metadata to be used for controlling a type and/or amount of audio enhancement at the decoder side after core decoding the encoded audio data; and (c) outputting the encoded audio data and the enhancement metadata. Described is further an encoder configured to perform said method. Described is moreover a method for generating enhanced audio data from low-bitrate coded audio data based on enhancement metadata and a decoder configured to perform said method.

9. 发明授权

US10217476B2 Companding system and method to reduce quantization noise using advanced spectral extension 有权
公开(公告)号：US10217476B2
公开(公告)日：2019-02-26
申请号：US15914917
申请日：2018-03-07
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC分类号： G10L19/00 , G10L21/0232 , G10L25/18 , G10L21/034 , H04B1/66 , G10L19/008 , G10L19/02 , G10L19/032 , G10L21/00 , G10L25/45 , H03G7/00
摘要： 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.

10. 发明申请

US20180197562A1 COMPANDING SYSTEM AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 审中-公开
公开(公告)号：US20180197562A1
公开(公告)日：2018-07-12
申请号：US15915405
申请日：2018-03-08
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC分类号： G10L21/0232 , G10L19/032 , G10L19/02 , G10L19/008 , H04B1/66
CPC分类号： G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
摘要： 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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