公开(公告)号：US07555434B2

公开(公告)日：2009-06-30

申请号：US10485616

申请日：2003-06-24

申请人： Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo

发明人： Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/032

摘要： An energy corrector (105) for correcting a target energy for high-frequency components and a corrective coefficient calculator (106) for calculating an energy corrective coefficient from low-frequency subband signals are newly provided. These processors perform a process for correcting a target energy that is required when a band expanding process is performed on a real number only. Thus, a real subband combining filter and a real band expander which require a smaller amount of calculations can be used instead of a complex subband combining filter and a complex band expander, while maintaining a high sound-quality level, and the required amount of calculations and the apparatus scale can be reduced.

摘要翻译： 新提供了用于校正高频分量的目标能量的能量校正器（105）和用于从低频子带信号计算能量校正系数的校正系数计算器（106）。 这些处理器执行用于校正仅对实数执行频带扩展处理时所需的目标能量的处理。 因此，可以使用需要较少量的计算的真实子带组合滤波器和实频扩展器来代替复数子带组合滤波器和复频带扩展器，同时保持高音质水平，并且所需的计算量 并且可以减少设备规模。

公开(公告)号：US07069212B2

公开(公告)日：2006-06-27

申请号：US10496798

申请日：2003-09-11

申请人： Naoya Tanaka ,  Osamu Shimada ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Toshiyuki Nomura ,  Yuichiro Takamizawa ,  Masahiro Serizawa

发明人： Naoya Tanaka ,  Osamu Shimada ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Toshiyuki Nomura ,  Yuichiro Takamizawa ,  Masahiro Serizawa

IPC分类号： G10L21/02

CPC分类号： G10L21/038 ,  G10L19/0204

摘要： An audio decoding apparatus decodes high frequency component signals using a band expander that generates multiple high frequency subband signals from low frequency subband signals divided into multiple subbands and transmitted high frequency encoded information. The apparatus is provided with an aliasing detector and an aliasing remover. The aliasing detector detects the degree of occurrence of aliasing components in the multiple high frequency subband signals generated by the band expander. The aliasing remover suppresses aliasing components in the high frequency subband signals by adjusting the gain used to generate the high frequency subband signals. Thus occurrence of aliasing can be suppressed and the resulting degradation in sound quality can be reduced, even when real-valued subband signals are used in order to reduce the number of operations.

摘要翻译： 音频解码装置利用频带扩展器对高频分量信号进行解码，频带扩展器从分割成多个子带的低频子带信号和发送的高频编码信息生成多个高频子带信号。 该装置设置有混叠检测器和混叠去除器。 混叠检测器检测由频带扩展器产生的多个高频子带信号中的混叠分量的出现程度。 混叠去除器通过调整用于产生高频子带信号的增益来抑制高频子带信号中的混叠分量。 因此，即使使用实值子带信号以减少操作次数，也可以抑制混叠的发生，并且可以降低所产生的声音质量下降。

公开(公告)号：US07941319B2

公开(公告)日：2011-05-10

申请号：US12393316

申请日：2009-02-26

申请人： Toshiyuki Nomura ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Osamu Shimada

发明人： Toshiyuki Nomura ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Osamu Shimada

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/032

摘要： An energy corrector (105) for correcting a target energy for high-frequency components and a corrective coefficient calculator (106) for calculating an energy corrective coefficient from low-frequency subband signals are newly provided. These processors perform a process for correcting a target energy that is required when a band expanding process is performed on a real number only. Thus, a real subband combining filter and a real band expander which require a smaller amount of calculations can be used instead of a complex subband combining filter and a complex band expander, while maintaining a high sound-quality level, and the required amount of calculations and the apparatus scale can be reduced.

摘要翻译： 新提供了用于校正高频分量的目标能量的能量校正器（105）和用于从低频子带信号计算能量校正系数的校正系数计算器（106）。 这些处理器执行用于校正仅对实数执行频带扩展处理时所需的目标能量的处理。 因此，可以使用需要较少量的计算的真实子带组合滤波器和实频扩展器来代替复数子带组合滤波器和复频带扩展器，同时保持高音质水平，并且所需的计算量 并且可以减少设备规模。

公开(公告)号：US20090259478A1

公开(公告)日：2009-10-15

申请号：US12393316

申请日：2009-02-26

申请人： Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo

发明人： Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa ,  Naoya Tanaka ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/032

摘要： An energy corrector (105) for correcting a target energy for high-frequency components and a corrective coefficient calculator (106) for calculating an energy corrective coefficient from low-frequency subband signals are newly provided. These processors perform a process for correcting a target energy that is required when a band expanding process is performed on a real number only. Thus, a real subband combining filter and a real band expander which require a smaller amount of calculations can be used instead of a complex subband combining filter and a complex band expander, while maintaining a high sound-quality level, and the required amount of calculations and the apparatus scale can be reduced.

摘要翻译： 新提供了用于校正高频分量的目标能量的能量校正器（105）和用于从低频子带信号计算能量校正系数的校正系数计算器（106）。 这些处理器执行用于校正仅对实数执行频带扩展处理时所需的目标能量的处理。 因此，可以使用需要较少量的计算的真实子带组合滤波器和实频扩展器来代替复数子带组合滤波器和复频带扩展器，同时保持高音质水平，并且所需的计算量 并且可以减少设备规模。

公开(公告)号：US07058571B2

公开(公告)日：2006-06-06

申请号：US10491894

申请日：2003-07-30

申请人： Mineo Tsushima ,  Naoya Tanaka ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa

发明人： Mineo Tsushima ,  Naoya Tanaka ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Toshiyuki Nomura ,  Osamu Shimada ,  Yuichiro Takamizawa ,  Masahiro Serizawa

IPC分类号： G10L21/02

CPC分类号： G10L21/038 ,  G10L19/02

摘要： A wideband, high quality audio signal is decoded with few calculations at a low bitrate. Unwanted spectrum components accompanying sinusoidal signal injection by a synthesis subband filter built with real-value operations are suppressed by inserting a suppression signal to subbands adjacent to the subband to which the sine wave is injected. This makes it possible to inject a desired sinusoid with few calculations.

摘要翻译： 宽带，高质量的音频信号以低比特率进行少量计算解码。 通过用实数值操作构建的合成子带滤波器伴随正弦信号注入的不需要的频谱分量通过将抑制信号插入到与正弦波被注入的子带相邻的子带来被抑制。 这样可以很少的计算注入所需的正弦波。

公开(公告)号：US20050149339A1

公开(公告)日：2005-07-07

申请号：US10496798

申请日：2003-09-11

申请人： Naoya Tanaka ,  Osamu Shimada ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Toshiyuki Nomura ,  Yuichiro Takamizawa ,  Masahiro Serizawa

发明人： Naoya Tanaka ,  Osamu Shimada ,  Mineo Tsushima ,  Takeshi Norimatsu ,  Kok Seng Chong ,  Kim Hann Kuah ,  Sua Hong Neo ,  Toshiyuki Nomura ,  Yuichiro Takamizawa ,  Masahiro Serizawa

IPC分类号： G10L19/08 ,  G10L21/02 ,  H03M7/30 ,  G10L19/00

CPC分类号： G10L21/038 ,  G10L19/0204

摘要： An audio decoding apparatus decodes high frequency component signals using a band expander that generates multiple high frequency subband signals from low frequency subband signals divided into multiple subbands and transmitted high frequency encoded information. The apparatus is provided with an aliasing detector and an aliasing remover. The aliasing detector detects the degree of occurrence of aliasing components in the multiple high frequency subband signals generated by the band expander. The aliasing remover suppresses aliasing components in the high frequency subband signals by adjusting the gain used to generate the high frequency subband signals. Thus occurrence of aliasing can be suppressed and the resulting degradation in sound quality can be reduced, even when real-valued subband signals are used in order to reduce the number of operations.

摘要翻译： 音频解码装置利用频带扩展器对高频分量信号进行解码，频带扩展器从分割成多个子带的低频子带信号和发送的高频编码信息生成多个高频子带信号。 该装置设置有混叠检测器和混叠去除器。 混叠检测器检测由频带扩展器产生的多个高频子带信号中的混叠分量的出现程度。 混叠去除器通过调整用于产生高频子带信号的增益来抑制高频子带信号中的混叠分量。 因此，即使使用实值子带信号以减少操作次数，也可以抑制混叠的发生，并且可以降低所产生的声音质量下降。

公开(公告)号：US07756713B2

公开(公告)日：2010-07-13

申请号：US11629135

申请日：2005-06-28

申请人： Kok Seng Chong ,  Naoya Tanaka ,  Sua Hong Neo ,  Mineo Tsushima

发明人： Kok Seng Chong ,  Naoya Tanaka ,  Sua Hong Neo ,  Mineo Tsushima

IPC分类号： G10L19/00

CPC分类号： G10L19/008 ,  G10L19/24

摘要： In the conventional art inventions for coding multi-channel audio signals, three of the major processes involved are: generation of a reverberation signal using an all-pass filter; segmentation of a signal in the time and frequency domains for the purpose of level adjustment; and mixing of a coded binaural signal with an original signal coded up to a fixed crossover frequency. These processes pose the problems mentioned in the present invention. The present invention proposes the following three embodiments: to control the extent of reverberations by dynamically adjusting all-pass filter coefficients with the inter-channel coherence cues; to segment a signal in the time domain finely in the lower frequency region and coarsely in the higher frequency region; and to control a crossover frequency used for mixing based on a bit rate, and if the original signal is coarsely quantized, to mix a downmix signal with an original signal in proportions determined by an inter-channel coherence cue.

摘要翻译： 在用于编码多声道音频信号的传统技术发明中，涉及的三个主要过程是：使用全通滤波器产生混响信号; 用于时间和频域的信号分段，以进行电平调整; 并将编码的双耳信号与编码为固定的交越频率的原始信号进行混合。 这些处理构成了本发明中提到的问题。 本发明提出以下三个实施例：通过使用信道间相干线索动态调整全通滤波器系数来控制混响的程度; 以在较低频率区域精细地分割时域中的信号，在较高频率区域中粗略地分割信号; 并且基于比特率来控制用于混合的交叉频率，并且如果原始信号被粗量化，则以通过信道内相干提示确定的比例将下混合信号与原始信号混合。

公开(公告)号：US07668711B2

公开(公告)日：2010-02-23

申请号：US10575452

申请日：2005-04-20

申请人： Kok Seng Chong ,  Sua Hong Neo ,  Naoya Tanaka ,  Takeshi Norimatsu

发明人： Kok Seng Chong ,  Sua Hong Neo ,  Naoya Tanaka ,  Takeshi Norimatsu

IPC分类号： G10L19/00

CPC分类号： G10L19/032

摘要： According to the present invention, it is possible to calculate appropriate chirp factor and noise component amount with a little processing amount.Input subband signal is segmented into a plurality of ranges by a range segmentation unit 101. The range segmentation is performed for energy value calculation, chirp factor calculation, noise component calculation, and tone component calculation, respectively, and determined range segmentation information ei, bi, qi, and hi are outputted. Respective processing for the energy calculation, the chirp factor calculation, the tone component calculation, and the noise component calculation are performed sequentially for the respective corresponding ranges. By using linear prediction processing, it is possible to obtain an parameter having higher accuracy with a little operation amount.

摘要翻译： 根据本发明，可以以少量的处理量来计算适当的啁啾因子和噪声成分量。 通过距离分割单元101将输入子带信号分割成多个范围。对能量值计算，啁啾因子计算，噪声分量计算和色调分量计算分别执行范围分割，并且确定范围分割信息ei，bi ，qi和hi。 针对各个对应的范围顺序地进行能量计算，啁啾因子计算，色调分量计算和噪声分量计算的各个处理。 通过使用线性预测处理，可以以少量的操作量获得具有较高精度的参数。

公开(公告)号：US07451091B2

公开(公告)日：2008-11-11

申请号：US10567601

申请日：2004-10-04

申请人： Kok Seng Chong ,  Sua Hong Neo ,  Naoya Tanaka ,  Takeshi Norimatsu

发明人： Kok Seng Chong ,  Sua Hong Neo ,  Naoya Tanaka ,  Takeshi Norimatsu

IPC分类号： G10L21/04

CPC分类号： G10L21/038 ,  G10L19/025 ,  H04B1/667

摘要： A frame type for a current SBR frame is determined according to a type of end border of a previous frame, as well as presence of a transient in the current SBR frame. A start border is determined according to the end border of the previous SBR frame. For a FIXFIX frame, a low time-resolution setting is used. For a FIXVAR or a VARVAR frame, a search for intermediate borders is conducted in the region between the transient and maximum allowed end border location. The end border is also determined at this stage. If there is excess capacity for more borders, another search is conducted in the region between the transient and the start border. For a VARFIX frame, only one search needs to be conducted, in the whole region partitioned by a variable start border and a fixed end border. All of the above are accomplished with two Forward Search operations and one Backward Search operation. They employ the same principle, which is based on evaluating the signal variation of a time segment, but with minor variations to suit the scenarios in which they are applied.

摘要翻译： 根据前一帧的结束边界的类型以及当前SBR帧中的瞬态的存在来确定当前SBR帧的帧类型。 根据先前SBR帧的结束边界确定开始边界。 对于FIXFIX框架，使用低时间分辨率设置。 对于FIXVAR或VARVAR帧，在瞬态和允许的最终边界位置之间的区域中进行中间边界的搜索。 终点边界也是在这个阶段确定的。 如果越多边界的容量过剩，则在暂时和起始边界之间的区域进行另一次搜索。 对于VARFIX框架，只需要进行一次搜索，在整个区域中由可变起始边框和固定边框划分。 以上都是通过两次前向搜索操作和一个向后搜索操作实现的。 它们采用相同的原理，其基于评估时间段的信号变化，但是具有适应其应用场景的较小变化。

公开(公告)号：US20070156397A1

公开(公告)日：2007-07-05

申请号：US10575452

申请日：2005-04-20

申请人： Kok Seng Chong ,  Sua Hong Neo ,  Naoya Tanaka ,  Takeshi Norimatsu

发明人： Kok Seng Chong ,  Sua Hong Neo ,  Naoya Tanaka ,  Takeshi Norimatsu

IPC分类号： G10L19/02

CPC分类号： G10L19/032

摘要： According to the present invention, it is possible to calculate appropriate chirp factor and noise component amount with a little processing amount. Input subband signal is segmented into a plurality of ranges by a range segmentation unit 101. The range segmentation is performed for energy value calculation, chirp factor calculation, noise component calculation, and tone component calculation, respectively, and determined range segmentation information ei, bi, qi, and hi are outputted. Respective processing for the energy calculation, the chirp factor calculation, the tone component calculation, and the noise component calculation are performed sequentially for the respective corresponding ranges. By using linear prediction processing, it is possible to obtain an parameter having higher accuracy with a little operation amount.

摘要翻译： 根据本发明，可以以少量的处理量来计算适当的啁啾因子和噪声成分量。 通过距离分割单元101将输入子带信号分割成多个范围。对能量值计算，啁啾因子计算，噪声分量计算和色调分量计算分别执行范围分割，并且确定范围分割信息ei，bi ，qi和hi。 针对各个对应的范围顺序地进行能量计算，啁啾因子计算，色调分量计算和噪声分量计算的各个处理。 通过使用线性预测处理，可以以少量的操作量获得具有较高精度的参数。