利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

53 条记录 (耗时 0.04 秒)

    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。

    Audio signal decoding device which decodes a downmix channel signal and audio signal encoding device which encodes audio channel signals together with spatial audio information
    9.
    发明授权
    Audio signal decoding device which decodes a downmix channel signal and audio signal encoding device which encodes audio channel signals together with spatial audio information 有权
    音频信号解码装置，其对下混频道信号和音频信号编码装置进行解码，该装置将音频信道信号与空间音频信息一起编码

    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。

    Encoding device and decoding device
    10.
    发明授权
    Encoding device and decoding device 有权
    编码设备和解码设备

    公开(公告)号：US08108222B2

    公开(公告)日：2012-01-31

    申请号：US12836900

    申请日：2010-07-15

    申请人： Mineo Tsushima ,  Takeshi Norimatsu ,  Kosuke Nishio ,  Naoya Tanaka

    发明人： Mineo Tsushima ,  Takeshi Norimatsu ,  Kosuke Nishio ,  Naoya Tanaka

    IPC分类号： G10L21/00

    CPC分类号： G10L21/038 ,  G10L19/0208 ,  G10L19/0212

    摘要： An encoding device (200) includes an MDCT unit (202) that transforms an input signal in a time domain into a frequency spectrum including a lower frequency spectrum, a BWE encoding unit (204) that generates extension data which specifies a higher frequency spectrum at a higher frequency than the lower frequency spectrum, and an encoded data stream generating unit (205) that encodes to output the lower frequency spectrum obtained by the MDCT unit (202) and the extension data obtained by the BWE encoding unit (204). The BWE encoding unit (204) generates as the extension data (i) a first parameter which specifies a lower subband which is to be copied as the higher frequency spectrum from among a plurality of the lower subbands which form the lower frequency spectrum obtained by the MDCT unit (202) and (ii) a second parameter which specifies a gain of the lower subband after being copied.

    摘要翻译： 一种编码装置（200）包括：将时域中的输入信号变换成包括较低频谱的频谱的MDCT单元（202），生成扩展数据的BWE编码单元（204），其生成指定较高频谱的扩展数据 频率高于较低频谱的编码数据流生成单元（205），其编码为输出由MDCT单元（202）获得的较低频谱和由BWE编码单元（204）获得的扩展数据。 BWE编码单元（204）生成作为扩展数据（i）的第一参数，该第一参数指定要从多个下个子带中复制的较低子带作为较高频谱，其形成由 MDCT单元（202）和（ii）指定复制后下一个子带的增益的第二参数。