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1. 发明申请

WO2008049590A1 APPARATUS AND METHOD FOR GENERATING AUDIO SUBBAND VALUES AND APPARATUS AND METHOD FOR GENERATING TIME-DOMAIN AUDIO SAMPLES 审中-公开
标题翻译：用于生成音频子带值的装置和方法以及用于产生时域音频样本的装置和方法
公开(公告)号：WO2008049590A1
公开(公告)日：2008-05-02
申请号：PCT/EP2007/009200
申请日：2007-10-23
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , SCHNELL, Markus , LUTZKY, Manfred , LOHWASSER, Markus , SCHMIDT, Markus , GAYER, Marc , MELLAR, Michael , EDLER, Bernd , MULTRUS, Markus , SCHULLER, Gerald , GEIGER, Ralf , GRILL, Bernhard
发明人： SCHNELL, Markus , LUTZKY, Manfred , LOHWASSER, Markus , SCHMIDT, Markus , GAYER, Marc , MELLAR, Michael , EDLER, Bernd , MULTRUS, Markus , SCHULLER, Gerald , GEIGER, Ralf , GRILL, Bernhard
IPC分类号： G10L19/02 , H03H17/02
CPC分类号： G10L19/0204 , G10L19/022 , G10L21/038 , G10L25/45 , H03H17/0266
摘要： An embodiment of an apparatus (100) for generating audio subband values in audio subband channels comprises an analysis windower (110) for windowing a frame (120) of time-domain audio input samples being in a time sequence extending from an early sample to a later sample using an analysis window function (190) comprising a sequence of window coefficients to obtain windowed samples. The analysis window function comprises a first number of window coefficients derived from a larger window function comprising a sequence of a larger second number of window coefficients, wherein the window coefficients of the window function are derived by an interpolation of window coefficients of the larger window function. The apparatus (100) further comprises a calculator (170) for calculating the audio subband values using the windowed samples.
摘要翻译：用于在音频子频带信道中产生音频子频带值的装置（100）的一个实施例包括分析加窗器（110），用于将时域音频输入样本的帧（120）以从早期样本延伸到使用包括窗系数序列的分析窗函数（190）以获得窗口样本的后续样本。分析窗函数包括从包括较大第二数目窗系数的序列的较大窗口函数导出的第一数目的窗系数，其中窗函数的窗系数通过较大窗函数的窗系数的内插导出。所述装置（100）还包括用于使用所述窗口样本来计算音频子带值的计算器（170）。

2. 发明申请

WO2008049589A1 APPARATUS AND METHOD FOR GENERATING AUDIO SUBBAND VALUES AND APPARATUS AND METHOD FOR GENERATING TIME-DOMAIN AUDIO SAMPLES 审中-公开
标题翻译：用于生成音频子带值的装置和方法以及用于产生时域音频样本的装置和方法
公开(公告)号：WO2008049589A1
公开(公告)日：2008-05-02
申请号：PCT/EP2007/009199
申请日：2007-10-23
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , SCHNELL, Markus , LUTZKI, Manfred , LOHWASSER, Markus , SCHMIDT, Markus , GAYER, Marc , MELLAR, Michael , EDLER, Bernd , MULTRUS, Markus , SCHULLER, Gerald , GEIGER, Ralf , GRILL, Bernhard
发明人： SCHNELL, Markus , LUTZKI, Manfred , LOHWASSER, Markus , SCHMIDT, Markus , GAYER, Marc , MELLAR, Michael , EDLER, Bernd , MULTRUS, Markus , SCHULLER, Gerald , GEIGER, Ralf , GRILL, Bernhard
IPC分类号： G10L19/02
CPC分类号： G10L19/0204 , G10L19/022 , G10L21/038 , G10L25/45 , H03H17/0266
摘要： An embodiment of an apparatus (100) for generating audio subband values in audio subband channels comprises an analysis windower (110) for windowing a frame (120) of time-domain audio input samples being in a time sequence extending from an early sample to a later sample using an analysis window function (190) comprising a sequence of window coefficients to obtain windowed samples. The analysis window function (190) comprises a first group (200) of window coefficients and a second group (210) of window coefficients. The first group (200) of window coefficients is used for windowing later time-domain samples and the second group (210) of window coefficients is used for windowing an earlier time-domain samples. The apparatus (100) further comprises a calculator (170) for calculating the audio subband values using the windowed samples.
摘要翻译：用于在音频子频带信道中产生音频子频带值的装置（100）的一个实施例包括分析加窗器（110），用于将时域音频输入样本的帧（120）以从早期样本延伸到使用包括窗系数序列的分析窗函数（190）以获得窗口样本的后续样本。分析窗函数（190）包括窗系数的第一组（200）和窗系数的第二组（210）。窗口系数的第一组（200）用于对稍后的时域采样进行加窗，并且窗口系数的第二组（210）用于对较早的时域采样进行加窗。所述装置（100）还包括用于使用所述窗口样本来计算音频子带值的计算器（170）。

3. 发明申请

WO2010003617A1 LOW BITRATE AUDIO ENCODING/DECODING SCHEME WITH COMMON PREPROCESSING 审中-公开
标题翻译：低分辨率音频编码/解码方案与通用预处理
公开(公告)号：WO2010003617A1
公开(公告)日：2010-01-14
申请号：PCT/EP2009/004873
申请日：2009-07-06
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , GRILL, Bernhard , BAYER, Stefan , FUCHS, Guillaume , GEYERSBERGER, Stefan , GEIGER, Ralf , HILPERT, Johannes , KRAEMER, Ulrich , LECOMTE, Jeremie , MULTRUS, Markus , NEUENDORF, Max , POPP, Harald , RETTELBACH, Nikolaus , NAGEL, Frederik , DISCH, Sascha , HERRE, Juergen , YOKOTANI, Yoshikazu , WABNIK, Stefan , SCHULLER, Gerald , HIRSCHFELD, Jens
发明人： GRILL, Bernhard , BAYER, Stefan , FUCHS, Guillaume , GEYERSBERGER, Stefan , GEIGER, Ralf , HILPERT, Johannes , KRAEMER, Ulrich , LECOMTE, Jeremie , MULTRUS, Markus , NEUENDORF, Max , POPP, Harald , RETTELBACH, Nikolaus , NAGEL, Frederik , DISCH, Sascha , HERRE, Juergen , YOKOTANI, Yoshikazu , WABNIK, Stefan , SCHULLER, Gerald , HIRSCHFELD, Jens
IPC分类号： G10L19/14
CPC分类号： G10L19/173 , G10L19/0017 , G10L19/008 , G10L19/0212 , G10L19/18 , G10L2019/0008
摘要： An audio encoder comprises a common preprocessing stage (100), an information sink based encoding branch (400) such as spectral domain encoding branch, a information source based encoding branch (500) such as an LPC-domain encoding branch and a switch (200) for switching between these branches at inputs into these branches or outputs of these branches controlled by a decision stage (300). An audio decoder comprises a spectral domain decoding branch, an LPC- domain decoding branch, one or more switches for switching between the branches and a common post-processing stage for post-processing a time-domain audio signal for obtaining a post-processed audio signal.
摘要翻译：音频编码器包括公共预处理级（100），诸如频域编码分支的基于信息集合的编码分支（400），诸如LPC域编码分支的信息源编码分支（500）和开关（200 ），用于在由决策阶段（300）控制的这些分支的这些分支或输出的输入处在这些分支之间切换。音频解码器包括频域解码分支，LPC域解码分支，用于在分支之间切换的一个或多个开关和用于后处理时域音频信号以用于获得后处理音频的公共后处理级信号。

4. 发明申请

WO2012110480A1 AUDIO CODEC SUPPORTING TIME-DOMAIN AND FREQUENCY-DOMAIN CODING MODES 审中-公开
标题翻译：音频编解码器支持时域和频域编码模式
公开(公告)号：WO2012110480A1
公开(公告)日：2012-08-23
申请号：PCT/EP2012/052461
申请日：2012-02-14
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , GEIGER, Ralf , SCHMIDT, Konstantin , GRILL, Bernhard , LUTZKY, Manfred , WERNER, Michael , GAYER, Marc , HILPERT, Johannes , VALERO, Maria Luis , JÄGERS, Wolfgang
发明人： GEIGER, Ralf , SCHMIDT, Konstantin , GRILL, Bernhard , LUTZKY, Manfred , WERNER, Michael , GAYER, Marc , HILPERT, Johannes , VALERO, Maria Luis , JÄGERS, Wolfgang
IPC分类号： G10L19/14 , G10L19/00 , G10L19/04
CPC分类号： G10L19/00 , G10K11/16 , G10L19/005 , G10L19/012 , G10L19/0212 , G10L19/025 , G10L19/03 , G10L19/04 , G10L19/107 , G10L19/12 , G10L19/22 , G10L19/26 , G10L21/0216 , G10L25/06 , G10L25/78
摘要： An audio codec supporting both, time-domain and frequency-domain coding modes, having low-delay and an increased coding efficiency in terms of iterate/distortion ratio, is obtained by configuring the audio encoder such that same operates in different operating modes such that if the active operative mode is a first operating mode, a mode dependent set of available frame coding modes is disjoined to a first subset of time-domain coding modes, and overlaps with a second subset of frequency-domain coding modes, whereas if the active operating mode is a second operating mode, the mode dependent set of available frame coding modes overlaps with both subsets, i.e. the subset of time-domain coding modes as well as the subset of frequency-domain coding modes.
摘要翻译：通过配置音频编码器，使得相同的操作在不同的操作模式下，可以获得支持时域和频域编码模式的音频编解码方式，具有低延迟和迭代/失真比方面提高的编码效率，使得如果活动操作模式是第一操作模式，则可用帧编码模式的模式相关集合被分离到时域编码模式的第一子集，并与频域编码模式的第二子集重叠，而如果活动操作模式是第二操作模式，可用帧编码模式的模式相关集合与两个子集重叠，即时域编码模式的子集以及频域编码模式的子集。

5. 发明申请

WO2010003491A1 AUDIO ENCODER AND DECODER FOR ENCODING AND DECODING FRAMES OF SAMPLED AUDIO SIGNAL 审中-公开
标题翻译：用于编码和解码采样音频信号的音频编码器和解码器
公开(公告)号：WO2010003491A1
公开(公告)日：2010-01-14
申请号：PCT/EP2009/004015
申请日：2009-06-04
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , VOICEAGE CORPORATION , GEIGER, Ralf , GRILL, Bernhard , BESSETTE, Bruno , GOURNAY, Philippe , FUCHS, Guillaume , MULTRUS, Markus , NEUENDORF, Max , SCHULLER, Gerald
发明人： GEIGER, Ralf , GRILL, Bernhard , BESSETTE, Bruno , GOURNAY, Philippe , FUCHS, Guillaume , MULTRUS, Markus , NEUENDORF, Max , SCHULLER, Gerald
IPC分类号： G06F17/14 , G10L19/02 , G10L19/14
CPC分类号： G10L19/20 , G10L19/0212 , G10L19/08
摘要： An audio encoder (10) adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples. The audio encoder (10) comprises a predictive coding analysis stage (12) for determining information on coefficients of a synthesis filter and a prediction domain frame based on a frame of audio samples. The audio encoder (10) further comprises a time-aliasing introducing transformer (14) for transforming overlapping prediction domain frames to the frequency domain to obtain prediction domain frame spectra, wherein the time-aliasing introducing transformer (14) is adapted for transforming the overlapping prediction domain frames in a critically-sampled way. Moreover, the audio encoder (10) comprises a redundancy reducing encoder (16) for encoding the prediction domain frame spectra to obtain the encoded frames based on the coefficients and the encoded prediction domain frame spectra.
摘要翻译：一种音频编码器（10），适于对采样的音频信号的帧进行编码以获得编码的帧，其中帧包括多个时域音频采样。音频编码器（10）包括用于基于音频样本的帧来确定关于合成滤波器和预测域帧的系数的信息的预测编码分析阶段（12）。音频编码器（10）还包括时间混叠引入变压器（14），用于将重叠的预测域帧变换到频域以获得预测域帧频谱，其中时间混叠引入变压器（14）适于变换重叠预测域帧采用严格抽样方式。此外，音频编码器（10）包括用于根据系数和编码的预测域帧频谱对预测域帧频谱进行编码以获得编码帧的冗余减少编码器（16）。

6. 发明申请

WO2011147950A1 LOW-DELAY UNIFIED SPEECH AND AUDIO CODEC 审中-公开
标题翻译：低延迟语音和音频编解码器
公开(公告)号：WO2011147950A1
公开(公告)日：2011-12-01
申请号：PCT/EP2011/058701
申请日：2011-05-27
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , GEIGER, Ralf , SCHNELL, Markus , FUCHS, Guillaume , RAVELLI, Emmanuel , BÄCKSTRÖM, Tom , LECOMTE, Jérémie , SCHMIDT, Konstantin , RETTELBACH, Nikolaus , LUTZKY, Manfred , GRILL, Bernhard
发明人： GEIGER, Ralf , SCHNELL, Markus , FUCHS, Guillaume , RAVELLI, Emmanuel , BÄCKSTRÖM, Tom , LECOMTE, Jérémie , SCHMIDT, Konstantin , RETTELBACH, Nikolaus , LUTZKY, Manfred , GRILL, Bernhard
IPC分类号： G10L19/14
CPC分类号： G10L19/20
摘要： A unified speech and audio decoder is described, which comprises a frame buffer configured to buffer a sub-part of a datastream composed of consecutive frames in units of the frames so that the subpart continuously comprises at least one frame, each frame representing a coded version of a respective portion of consecutive portions of an audio signal, and each frame comprising a mode identifier assigning the respective frame to a respective one of a plurality of coding modes comprising a CELP (codebook excitation linear prediction) coding mode and a transform coded excitation linear prediction coding mode. Further, the unified speech and audio decoder comprises a CELP decoder configured to decode the frames to which the CELP coding mode is assigned to reconstruct the respective portions, and a transform coded excitation linear prediction decoder configured to decode the frames to which the transform coded excitation linear prediction coding mode is assigned, to reconstruct the respective portions, wherein the frame buffer is configured to distribute the frames buffered to the CELP decoder and the transform coded excitation linear prediction decoder under removal of the respective frames from the frame buffer, frame-wise.
摘要翻译：描述了一种统一的语音和音频解码器，其包括帧缓冲器，其被配置为以帧为单位缓冲由连续帧组成的数据流的子部分，使得该子部分连续地包括至少一个帧，每个帧表示编码版本音频信号的连续部分的相应部分，并且每个帧包括将各个帧分配给包括CELP（码本激励线性预测）编码模式和变换编码激励线性的多个编码模式中的相应一个的模式标识符预测编码模式。此外，统一语音和音频解码器包括：CELP解码器，被配置为对分配有CELP编码模式的帧进行解码以重构各个部分;以及变换编码激励线性预测解码器，被配置为对转换编码激励分配线性预测编码模式，以重建各个部分，其中帧缓冲器被配置为在从帧缓冲器移除相应帧的情况下，将缓冲到CELP解码器和变换编码激励线性预测解码器的帧分配。

7. 发明申请

WO2010003532A1 APPARATUS AND METHOD FOR ENCODING/DECODING AN AUDIO SIGNAL USING AN ALIASING SWITCH SCHEME 审中-公开
标题翻译：使用切换方案编码/解码音频信号的装置和方法
公开(公告)号：WO2010003532A1
公开(公告)日：2010-01-14
申请号：PCT/EP2009/004374
申请日：2009-06-17
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , FUCHS, Guillaume , LECOMTE, Jérémie , BAYER, Stefan , GEIGER, Ralf , MULTRUS, Markus , SCHULLER, Gerald , HIRSCHFELD, Jens
发明人： FUCHS, Guillaume , LECOMTE, Jérémie , BAYER, Stefan , GEIGER, Ralf , MULTRUS, Markus , SCHULLER, Gerald , HIRSCHFELD, Jens
IPC分类号： G10L19/02 , G10L19/04 , G10L19/14
CPC分类号： G10L19/20 , G10L19/02 , G10L19/022 , G10L19/04
摘要： An apparatus for encoding an audio signal comprises the windower (11) for windowing a first block of the audio signal using an analysis window having an aliasing portion and a further portion. The apparatus furthermore comprises a processor (12) for processing the first sub-block of the audio signal associated with the aliasing portion by transforming the sub-block from a domain into a different domain subsequent to windowing the first sub-block to obtain the processed first sub-block, and for processing a second sub-block of the audio signal associated with the further portion by transforming the second sub-block from the domain into the different domain before windowing the second sub-block to obtain a processed second sub-block. The apparatus furthermore comprises a transformer (13) for converting the processed first sub-block and the processed second sub-block from the different domain into a further different domain using the same block transform rule to obtain a converted first block which may then be compressed using any of the well-known data compression algorithms. Thus, a critically sampled switch between two coding modes can be obtained, since aliasing portions occurring in two different domains are matched to each other.
摘要翻译：用于编码音频信号的装置包括用于使用具有混叠部分和另一部分的分析窗口对音频信号的第一块进行加窗的加窗器（11）。所述装置还包括处理器（12），用于通过将所述子块从一个域变换成不同的域来处理与所述混叠部分相关联的所述音频信号的所述第一子块，所述第一子块在所述第一子块的加窗之后获得所述处理并且用于通过在开启第二子块之前将第二子块从该域变换为不同的域来处理与另一部分相关联的音频信号的第二子块，以获得处理的第二子块，块。该装置还包括用于使用相同的块变换规则将处理的第一子块和处理的第二子块从不同域转换成另一不同域的变压器（13），以获得可以被压缩的转换后的第一块使用任何众所周知的数据压缩算法。因此，由于发生在两个不同域中的混叠部分彼此匹配，所以可以获得两种编码模式之间的批量采样切换。

8. 发明申请

WO2010003564A1 LOW BITRATE AUDIO ENCODING/DECODING SCHEME HAVING CASCADED SWITCHES 审中-公开
标题翻译：低成本音频编码/解码方案具有CASCADED开关
公开(公告)号：WO2010003564A1
公开(公告)日：2010-01-14
申请号：PCT/EP2009/004652
申请日：2009-06-26
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V , VOICEAGE CORPORATION , GRILL, Bernhard , LEFEBVRE, Roch , BESSETTE, Bruno , LAPIERRE, Jimmy , GOURNAY, Philippe , SALAMI, Redwan , BAYER, Stefan , FUCHS, Guillaume , GEYERSBERGER, Stefan , GEIGER, Ralf , HILPERT, Johannes , KRAEMER, Ulrich , LECOMTE, Jeremie , MULTRUS, Markus , NEUENDORF, Max , POPP, Harald , RETTELBACH, Nikolaus
发明人： GRILL, Bernhard , LEFEBVRE, Roch , BESSETTE, Bruno , LAPIERRE, Jimmy , GOURNAY, Philippe , SALAMI, Redwan , BAYER, Stefan , FUCHS, Guillaume , GEYERSBERGER, Stefan , GEIGER, Ralf , HILPERT, Johannes , KRAEMER, Ulrich , LECOMTE, Jeremie , MULTRUS, Markus , NEUENDORF, Max , POPP, Harald , RETTELBACH, Nikolaus
IPC分类号： G10L19/14
CPC分类号： G10L19/008 , G10L19/0017 , G10L19/0212 , G10L19/173 , G10L19/18 , G10L2019/0008
摘要： An audio encoder comprises a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoding branch such as an LPC-domain encoding branch, and a switch for switching between the first encoding branch and the second encoding branch, wherein the second encoding branch comprises a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and wherein the second encoding branch furthermore comprises a specific domain coding branch such as LPC domain processing branch, and a specific spectral domain coding branch such as LPC spectral domain processing branch, and an additional switch for switching between the specific domain coding branch and the specific spectral domain coding branch. An audio decoder comprises a first domain decoder such as a spectral domain decoding branch, a second domain decoder such as an LPC domain decoding branch for decoding a signal such as an excitation signal in the second domain, and a third domain decoder such as an LPC-spectral decoder branch and two cascaded switches for switching between the decoders.
摘要翻译：音频编码器包括第一信息宿定向编码分支，诸如频域编码分支，第二信息源或SNR定向编码分支，诸如LPC域编码分支，以及用于在第一编码分支与第二编码分支之间进行切换的开关编码分支，其中所述第二编码分支包括转换器到不同于所述频域的特定域，例如产生激励信号的LPC分析阶段，并且其中所述第二编码分支还包括特定域编码分支，诸如LPC域处理分支，以及诸如LPC频域处理分支的特定频域编码分支，以及用于在特定编码分支和特定频域编码分支之间切换的附加开关。音频解码器包括诸如频域解码分支的第一域解码器，诸如LPC域解码分支的第二域解码器，用于对诸如第二域中的激励信号的信号进行解码，以及第三域解码器，诸如LPC 光谱解码器分支和两个级联开关，用于在解码器之间切换。

9. 发明申请

WO2012045816A1 APPARATUS AND METHOD FOR LEVEL ESTIMATION OF CODED AUDIO FRAMES IN A BIT STREAM DOMAIN 审中-公开
标题翻译：用于在位流域中编码的音频框架的级别估计的装置和方法
公开(公告)号：WO2012045816A1
公开(公告)日：2012-04-12
申请号：PCT/EP2011/067466
申请日：2011-10-06
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , GEIGER, Ralf , SCHNELL, Markus , LUTZKY, Manfred , DIATSCHUK, Marco
发明人： GEIGER, Ralf , SCHNELL, Markus , LUTZKY, Manfred , DIATSCHUK, Marco
IPC分类号： G10L19/00 , H04N7/15
CPC分类号： G10L19/008 , G10L19/0017 , H04N7/152
摘要： An apparatus for level estimation of an encoded audio signal is provided. The apparatus comprises a codebook determinator (110) for determining a codebook from a plurality of codebooks as an identified codebook. The audio signal has been encoded by employing the identified codebook. Moreover, the apparatus comprises an estimation unit (120) configured for deriving a level value associated with the identified codebook as a derived level value and, for estimating a level estimate of the audio signal using the derived level value.
摘要翻译：提供了一种用于编码音频信号的电平估计的装置。该装置包括用于从多个码本确定码本作为识别的码本的码本确定器（110）。音频信号已通过采用识别的码本进行编码。此外，该装置包括被配置为将与所识别的码本相关联的电平值导出为导出电平值的估计单元（120），并且用于使用导出的电平值来估计音频信号的电平估计。

10. 发明申请

WO2011048094A1 MULTI-MODE AUDIO CODEC AND CELP CODING ADAPTED THEREFORE 审中-公开
标题翻译：多模式音频编解码器和CELP编码适配器
公开(公告)号：WO2011048094A1
公开(公告)日：2011-04-28
申请号：PCT/EP2010/065718
申请日：2010-10-19
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , GEIGER, Ralf , FUCHS, Guillaume , MULTRUS, Markus , GRILL, Bernhard
发明人： GEIGER, Ralf , FUCHS, Guillaume , MULTRUS, Markus , GRILL, Bernhard
IPC分类号： G10L19/14 , G10L19/08
CPC分类号： G10L19/12 , G10L19/03 , G10L19/04 , G10L19/083 , G10L19/20 , G10L2019/0002
摘要： In accordance with a first aspect of the present invention, bitstream elements of sub-frames are encoded differentially to a global gain value so that a change of the global gain value of the frames results in an adjustment of an output level of the decoded representation of the audio content. Concurrently, the differential coding saves bits otherwise occurring when introducing a new syntax element into an encoded bitstream. Even further, the differential coding enables the lowering of the burden of globally adjusting the gain of an encoded bitstream by allowing the time resolution in setting the global gain value to be lower than the time resolution at which the afore-mentioned bitstream element differentially encoded to the global gain value adjusts the gain of the respective sub-frame. In accordance with another aspect, a global gain control across CELP coded frames and transform coded frames is achieved by co-controlling the gain of the codebook excitation of the CELP codec, along with a level of the transform or inverse transform of the transform coded frames. According to even another aspect, a variation of the loudness of a CELP coded bitstream upon changing the respective gain value is rendered more well adapted to the behavior of transform coded level adjustments, by performing the gain value determination in CELP coding in the weighted domain of the excitation signal.
摘要翻译：根据本发明的第一方面，子帧的比特流元素被差分地编码为全局增益值，使得帧的全局增益值的改变导致对解码表示的输出电平的调整音频内容。同时，差分编码保存在将新的语法元素引入到编码比特流中时所发生的位。此外，差分编码能够通过在将全局增益值设定为低于上述比特流元素差分编码的时间分辨率的同时允许时间分辨率来降低全局调整编码比特流的增益的负担全局增益值调整相应子帧的增益。根据另一方面，跨CELP编码帧和变换编码帧的全局增益控制通过共同控制CELP编解码器的码本激励的增益以及变换编码帧的变换或逆变换的级别来实现。根据另一方面，通过在加权域中的CELP编码中执行增益值确定，在改变相应增益值时，CELP编码比特流的响度的变化被更好地适应于变换编码电平调整的行为激励信号。

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