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    Audio decoding apparatus and method for band expansion with aliasing adjustment
    2.
    发明授权
    Audio decoding apparatus and method for band expansion with aliasing adjustment 有权
    用于通过混叠调整进行频带扩展的音频解码装置和方法

    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。

    Audio decoding apparatus and method
    6.
    发明申请
    Audio decoding apparatus and method 有权
    音频解码装置和方法

    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。

    Hierarchical lossless encoding/decoding method, hierarchical lossless encoding method, hierarchical lossless decoding method, its apparatus and program
    9.
    发明授权
    Hierarchical lossless encoding/decoding method, hierarchical lossless encoding method, hierarchical lossless decoding method, its apparatus and program 有权
    分级无损编码/解码方法，分层无损编码方法，分级无损解码方法，其装置和程序

    公开(公告)号：US07454354B2

    公开(公告)日：2008-11-18

    申请号：US10478905

    申请日：2003-03-24

    申请人： Toshiyuki Nomura ,  Yuichiro Takamizawa

    发明人： Toshiyuki Nomura ,  Yuichiro Takamizawa

    IPC分类号： G01L21/04 ,  G01L19/14

    CPC分类号： G10L19/0017

    摘要： A hierarchical lossless encoding and decoding technology for digital signals such as of music data, audio data, or the like. A lossless reproduced signal is made identical to an input signal even when the processing accuracy in an encoding apparatus and the processing accuracy in a decoding apparatus are different from each other. the encoding apparatus transmits low-bit-rate encoded data produced by encoding an input signal, lossless encoded data produced by effecting lossless encoding on a differential signal between a low-bit-rate decoded signal decoded from the low-bit-rate encoded data and the input signal, and corrective information extracted from the low-bit-rate decoded signal to respective input terminals of the decoding apparatus. A low-bit-rate decoder decodes the low-bit-rate encoded data. A lossless decoder decodes the differential signal. A corrector corrects the low-bit-rate decoded signal based on the corrective information. An adder adds the differential signal and the corrected low-bit-rate decoded signal into a lossless reproduced signal.

    摘要翻译： 用于诸如音乐数据，音频数据等的数字信号的分级无损编码和解码技术。 即使当编码装置中的处理精度和解码装置中的处理精度彼此不同时，无损复制信号也与输入信号相同。 编码装置发送通过对输入信号进行编码而产生的低比特率编码数据，通过对从低比特率编码数据解码的低比特率解码信号和差分信号之间的差分信号进行无损编码而产生的无损编码数据和 输入信号和从低比特率解码信号提取的解码信息到解码装置的各个输入端。 低比特率解码器解码低比特率编码数据。 无损解码器解码差分信号。 校正器基于校正信息来校正低比特率解码信号。 加法器将差分信号和校正的低比特率解码信号加到无损再现信号中。

    Audio encoder utilizing bandwidth-limiting processing based on code amount characteristics
    10.
    发明授权
    Audio encoder utilizing bandwidth-limiting processing based on code amount characteristics 有权
    音频编码器利用基于码量特性的带宽限制处理

    公开(公告)号：US07343292B2

    公开(公告)日：2008-03-11

    申请号：US10399101

    申请日：2001-10-11

    申请人： Yuichiro Takamizawa ,  Toshiyuki Nomura

    发明人： Yuichiro Takamizawa ,  Toshiyuki Nomura

    IPC分类号： G10L19/00 ,  G10L21/00

    CPC分类号： G10L19/0212 ,  G10L19/002 ,  G10L19/0204

    摘要： A mapping transform unit subjects input audio signals to a mapping transform and generates frequency region signals that take frequency as a variable; a code amount designation unit supplies a preset coding bit rate as a code amount output; a frequency region signal compression encoder, based on the code amount, subjects input frequency region signals to a compression encoding process and generates a bitstream; and a bandwidth-limiting unit executes a bandwidth-limiting processing in which a part of the frequency zone covered by frequency region signals is allotted to an attenuation frequency zone, and in which the value of the frequency region signal is multiplied by an attenuation coefficient having a value less than 1 in the attenuation frequency zone to attenuate the frequency region signal in the attenuation frequency zone, and supplies the frequency region signals that have undergone the bandwidth-limiting processing to the frequency region signal compression encoder.

    摘要翻译： 输入变换单元对输入音频信号进行映射变换，生成将频率作为变量的频域信号; 代码量指定单元将预设编码比特率提供为代码量输出; 频率区域信号压缩编码器基于代码量，将输入频率区域信号转化为压缩编码处理并生成比特流; 并且带宽限制单元执行带宽限制处理，其中由频域信号覆盖的频域的一部分被分配给衰减频带，并且其中频域信号的值乘以具有 在衰减频率区域中小于1的值，以衰减衰减频带中的频域信号，并将经过带宽限制处理的频域信号提供给频域信号压缩编码器。