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公开(公告)号：US10553227B2
公开(公告)日：2020-02-04
申请号：US16167831
申请日：2018-10-23
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Erik Norvell , Volodya Grancharov
IPC: G10L19/00 , G10L19/028 , G10L25/51 , G10L19/02 , G10L19/038 , G10L19/002 , G10L25/06 , G10L19/18 , G10L25/21
Abstract: An audio signal, having first and second regions of frequency spectrum, is coded. Spectral peaks in the first region are encoded by a first coding method. For a segment of the audio signal, a relation between energy of bands in the first and second regions is determined. A relation between the energy of the band in the second region and energy of neighboring bands in the second region is determined. A determination is made whether available bits are sufficient for encoding at least one non-peak segment of the first region and the band in the second region. Responsive to first and second relations fulfilling a respective predetermined criterion and a sufficient number of bits, encoding the band in the second region using a second coding method different from the first coding method, and otherwise, subjecting the band in the second region to BandWidth Extension (BWE) or noise fill.
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公开(公告)号：US10147435B2
公开(公告)日：2018-12-04
申请号：US15655252
申请日：2017-07-20
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Erik Norvell , Volodya Grancharov
IPC: G10L19/00 , G10L19/028 , G10L19/002 , G10L25/51 , G10L19/02 , G10L19/038 , G10L25/21 , G10L25/06 , G10L19/18
Abstract: An audio signal, having first and second regions of frequency spectrum, is coded. Spectral peaks in the first region are encoded by a first coding method. For a segment of the audio signal, a relation between energy of bands in the first and second regions is determined. A relation between the energy of the band in the second region and energy of neighboring bands in the second region is determined. A determination is made whether available bits are sufficient for encoding at least one non-peak segment of the first region and the band in the second region. Responsive to first and second relations fulfilling a respective predetermined criterion and a sufficient number of bits, encoding the band in the second region using a second coding method different from the first coding method, and otherwise, subjecting the band in the second region to BandWidth Extension BWE or noise fill.
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公开(公告)号：US09620138B2
公开(公告)日：2017-04-11
申请号：US14649689
申请日：2015-05-07
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Erik Norvell , Volodya Grancharov
CPC classification number: G10L19/22 , G10L19/06 , G10L19/167 , G10L19/20 , G10L25/18 , G10L25/51 , G10L25/81
Abstract: The invention relates to a codec and a discriminator and methods therein for audio signal discrimination and coding. Embodiments of a method performed by an encoder comprises, for a segment of the audio signal: identifying a set of spectral peaks; determining a mean distance S between peaks in the set; and determining a ratio, PNR, between a peak envelope and a noise floor envelope. The method further comprises selecting a coding mode, out of a plurality of coding modes, based at least on the mean distance S and the ratio PNR; and applying the selected coding mode for coding of the segment of the audio signal.
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公开(公告)号：US09514756B2
公开(公告)日：2016-12-06
申请号：US14767499
申请日：2013-11-12
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Sebastian Näslund , Volodya Grancharov , Jonas Svedberg
IPC: G10L19/005
CPC classification number: G10L19/005 , G10L19/025
Abstract: A frame error concealment method based on frames including transform coefficient vectors including the following steps: It tracks (S11) sign changes between corresponding transform coefficients of predetermined sub-vectors of consecutive good stationary frames. It accumulates (S12) the number of sign changes in corresponding sub-vectors of a predetermined number of consecutive good stationary frames. It reconstructs (S13) an erroneous frame with the latest good stationary frame, but with reversed signs of transform coefficients in sub-vectors having an accumulated number of sign changes that exceeds a predetermined threshold.
Abstract translation: 基于包括以下步骤的变换系数向量的帧的帧错误隐藏方法：它跟踪（S11）符号连续良好静止帧的预定子向量的相应变换系数之间的变化。 它累积（S12）预定数量的连续良好静止帧的相应子向量中的符号变化的数量。 它重建（S13）具有最新良好静止帧的错误帧，但是具有超过预定阈值的累加数量符号变化的子向量中的变换系数的反转符号。
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公开(公告)号：US09385750B2
公开(公告)日：2016-07-05
申请号：US14440713
申请日：2014-11-11
Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
Inventor： Erik Norvell , Volodya Grancharov , Tomas Jansson Toftgård
IPC: H03M7/00 , H03M7/30 , G10L19/002 , G10L19/038 , G10L15/08 , H04N19/61 , H04B1/66
CPC classification number: H03M7/3082 , G10L15/08 , G10L19/002 , G10L19/038 , G10L19/22 , H03M7/30 , H04B1/665 , H04N19/124 , H04N19/61
Abstract: The invention relates to an encoder and a decoder and methods therein for supporting split gain shape vector encoding and decoding. The method performed by an encoder, where the encoding of each vector segment is subjected to a constraint related to a maximum number of bits, BMAX, allowed for encoding a vector segment. The method comprises, determining an initial number, Np—init, of segments for a target vector x; and further determining an average number of bits per segment, BAVG, based on a vector bit budget and Np—init. The method further comprises determining a final number of segments to be used, for the vector x, in the gain shape vector encoding, based on energies of the Np—init segments and a difference between BMAX and BAVG. The performing of the method enables an efficient allocation of the bits of the bit budget over the target vector.
Abstract translation: 本发明涉及一种用于支持分割增益形状向量编码和解码的编码器及其解码器及其方法。 由编码器执行的方法，其中每个矢量段的编码受到与用于编码矢量段的最大位数BMAX有关的约束。 该方法包括：确定目标向量x的段的初始数目Np-init; 并且还基于向量比特预算和Np-init进一步确定每个分段的平均比特数BAVG。 该方法还包括基于Np-init段的能量和BMAX与BAVG之间的差异来确定增益形状向量编码中针对向量x的待使用的段的最终数量。 执行该方法能够有效地分配比特预算的比特超过目标向量。
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公开(公告)号：US20150149161A1
公开(公告)日：2015-05-28
申请号：US14405707
申请日：2012-11-13
Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
Inventor： Volodya Grancharov , Erik Norvell , Sigurdur Sverrisson
IPC: G10L19/035 , G10L19/08
CPC classification number: G10L19/035 , G10L19/002 , G10L19/08
Abstract: In a quantization method for quantizing a received excitation signal in a communication system performing the steps of re-shuffling S301 the elements of the received excitation signal to provide a re-shuffled excitation signal; coding S302 the re-shuffled excitation signal with a variable bit-rate algorithm to provide a coded excitation signal; and reassigning S303 codewords of the coded excitation signal if a number of used bits exceeds a predetermined fixed bit rate requirement to provide a quantized excitation signal.
Abstract translation: 在用于量化接收到的激励信号的量化方法中，执行以下步骤的通信系统中的接收到的激励信号：重新混洗S301所接收的激励信号的元素以提供重新混洗的激励信号; 用可变比特率算法编码S302重新混洗的激励信号以提供编码的激励信号; 并且如果所使用的比特数超过预定的固定比特率要求以提供量化的激励信号，则重新分配编码的激励信号的S303码字。
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公开(公告)号：US20150088527A1
公开(公告)日：2015-03-26
申请号：US14388052
申请日：2012-12-21
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Sebastian Näslund , Volodya Grancharov , Tomas Jansson Toftgård
IPC: G10L19/02
CPC classification number: G10L19/0204 , G10L19/02 , G10L19/028 , G10L21/0388 , G10L25/21
Abstract: Methods and arrangements in a codec for supporting bandwidth extension, BWE, of an harmonic audio signal. The method in the decoder part of the codec comprises receiving a plurality of gain values associated with a frequency band b and a number of adjacent frequency bands of band b. The method further comprises determining whether a reconstructed corresponding frequency band b′ comprises a spectral peak. When the band b′ comprises a spectral peak, a gain value associated with the band b′ is set to a first value based on the received plurality of gain values; and otherwise the gain value is set to a second value based on the received plurality of gain values. The suggested technology enables bringing gain values into agreement with peak positions in a bandwidth extended frequency region.
Abstract translation: 用于支持谐波音频信号的带宽扩展（BWE）的编解码器中的方法和布置。 编解码器的解码器部分中的方法包括接收与频带b和频带b的相邻频带数量相关联的多个增益值。 该方法还包括确定重建的对应频带b'是否包括频谱峰值。 当频带b'包括频谱峰值时，基于所接收的多个增益值将与频带b'相关联的增益值设置为第一值; 否则根据所接收的多个增益值将增益值设定为第二值。 所提出的技术使增益值与带宽扩展频率区域中的峰值位置一致。
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公开(公告)号：US20150051907A1
公开(公告)日：2015-02-19
申请号：US14387716
申请日：2012-12-12
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Volodya Grancharov , Tomas Jansson Toftgård
IPC: G10L19/038
CPC classification number: G10L19/038 , G10L19/18 , G10L2019/0013 , H03M7/3082 , H04N19/94
Abstract: Vector Quantizer and method therein for efficient vector quantization, e.g. in a transform audio codec. The method comprises comparing an input target vector s with a plurality of centroids, each centroid representing a respective class of codevectors in a codebook. Further, a starting point for a search related to the input target vector in the codebook is determined, based on the result of the comparison. The codevectors in the codebook are sorted according to a distortion measure reflecting the distance between each codevector and the centroids of the classes. The Vector Quantizer and method enables that the class of codevectors comprising the most probable candidate codevectors in regard of the input vector. s may be searched first.
Abstract translation: 矢量量化器及其中的方法，用于有效的矢量量化，例如 在转换音频编解码器。 该方法包括将输入目标矢量s与多个质心进行比较，每个质心代表码本中的相应类码矢量。 此外，基于比较的结果，确定与码本中的输入目标矢量有关的搜索的起始点。 码本中的代码矢量根据反映每个代码矢量和类的质心之间的距离的失真度量进行排序。 矢量量化器和方法使得能够包括关于输入向量的最可能的候选码矢量的码矢类。 可能会首先搜索。
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公开(公告)号：US09589576B2
公开(公告)日：2017-03-07
申请号：US14355532
申请日：2012-10-19
Applicant: Telefonaktiebolaget L M Ericsson (publ)
Inventor： Sigurdur Sverrisson , Erik Norvell , Volodya Grancharov
IPC: G10L21/00 , G10L21/038 , G10L19/00
CPC classification number: G10L21/038
Abstract: Audio decoder and method therein for supporting bandwidth extension (BWE) of a received signal. The method involves receiving a first signal representing the lower frequency spectrum of a segment of an original audio signal; receiving a second signal, being a BWE signal, representing a higher frequency spectrum of the segment of the original audio signal. The method further comprises determining a degree of voicing in the lower frequency spectrum of the audio signal, based on the received first signal; and selecting a spectral tilt adaptation filter, out of at least two spectral tilt adaptation filters having different spectral attenuation characteristics, based on the determined degree of voicing. The selected spectral tilt adaptation filter is then applied on the received second signal. Thus, a differentiation of spectral tilt in the higher frequency spectrum of a reconstructed audio signal, based on lower frequency spectrum characteristics of the original audio signal is enabled.
Abstract translation: 音频解码器及其方法，用于支持接收信号的带宽扩展（BWE）。 该方法包括接收表示原始音频信号的段的较低频谱的第一信号; 接收作为BWE信号的第二信号，表示原始音频信号的段的较高频谱。 该方法还包括基于接收的第一信号来确定音频信号的较低频谱中的发音程度; 以及基于确定的发音程度，从具有不同频谱衰减特性的至少两个频谱倾斜自适应滤波器中选择频谱倾斜适配滤波器。 然后将所选择的频谱倾斜适配滤波器应用于所接收的第二信号。 因此，能够基于原始音频信号的较低频谱特性，对重构音频信号的较高频谱中的频谱倾斜的微分。
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公开(公告)号：US09524727B2
公开(公告)日：2016-12-20
申请号：US14405707
申请日：2012-11-13
Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
Inventor： Volodya Grancharov , Erik Norvell , Sigurdur Sverrisson
IPC: G10L19/00 , G10L19/035 , G10L19/002 , G10L19/08
CPC classification number: G10L19/035 , G10L19/002 , G10L19/08
Abstract: In a quantization method for quantizing a received excitation signal in a communication system performing the steps of re-shuffling S301 the elements of the received excitation signal to provide a re-shuffled excitation signal; coding S302 the re-shuffled excitation signal with a variable bit-rate algorithm to provide a coded excitation signal; and reassigning S303 codewords of the coded excitation signal if a number of used bits exceeds a predetermined fixed bit rate requirement to provide a quantized excitation signal.
Abstract translation: 在用于量化接收到的激励信号的量化方法中，执行以下步骤的通信系统中的接收到的激励信号：重新混洗S301所接收的激励信号的元素以提供重新混洗的激励信号; 用可变比特率算法编码S302重新混洗的激励信号以提供编码的激励信号; 并且如果所使用的比特数超过预定的固定比特率要求以提供量化的激励信号，则重新分配编码的激励信号的S303码字。
