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    COMPANDING APPARATUS AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION
    5.
    发明申请
    COMPANDING APPARATUS AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 有权
    使用高级光谱扩展降低量化噪声的装置和方法

    公开(公告)号：US20160019908A1

    公开(公告)日：2016-01-21

    申请号：US14762690

    申请日：2014-04-01

    申请人： DOLBY INTERNATIONAL AB ,  DOLBY LABORATORIES LICENSING CORPORATION

    发明人： Per HEDELIN ,  Arijit BISWAS ,  Michael SCHUG ,  Vinay MELKOTE

    IPC分类号： G10L21/0232 ,  G10L19/032 ,  G10L19/008 ,  G10L19/02 ,  G10L21/034 ,  G10L25/18

    CPC分类号： G10L21/0232 ,  G10L19/008 ,  G10L19/0208 ,  G10L19/032 ,  G10L21/034 ,  G10L25/18 ,  G10L25/45 ,  H03G7/007 ,  H04B1/66

    摘要： Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.

    摘要翻译： 实施例涉及用于减少音频编解码器中的编码噪声的压扩方法和系统。 压缩处理通过压缩处理来降低初始音频信号的原始动态范围，该压缩处理使用定义的窗口形状将初始音频信号分成多个段，使用基于非能量的平均值来计算频域中的宽带增益 初始音频信号的频域样本，并且应用各个增益值来放大相对较低强度的片段并衰减相对较高强度的片段。 压缩的音频信号然后被扩展回到基本上原始的动态范围，该动态范围应用反向增益值来放大相对较高强度的片段，并且衰减相对较低强度的段。 使用QMF滤波器组来分析初始音频信号以获得频域表示。

    METHOD AND SYSTEM FOR ENCODING AUDIO DATA WITH ADAPTIVE LOW FREQUENCY COMPENSATION
    10.
    发明申请
    METHOD AND SYSTEM FOR ENCODING AUDIO DATA WITH ADAPTIVE LOW FREQUENCY COMPENSATION 有权
    用自适应低频补偿编码音频数据的方法和系统

    公开(公告)号：US20140324441A1

    公开(公告)日：2014-10-30

    申请号：US14325130

    申请日：2014-07-07

    申请人： DOLBY LABORATORIES LICENSING CORPORATION ,  DOLBY INTERNATIONAL AB

    发明人： Arijit BISWAS ,  Vinay MELKOTE ,  Michael SCHUG ,  Grant A. DAVIDSON ,  Mark S. VINTON

    IPC分类号： G10L19/028 ,  G10L19/26

    CPC分类号： G10L19/028 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/265

    摘要： A method for determining mantissa bit allocation of audio data values of frequency domain audio data to be encoded. The allocation method includes a step of determining masking values for the audio data values, including by performing adaptive low frequency compensation on the audio data of each frequency band of a set of low frequency bands of the audio data. The adaptive low frequency compensation includes steps of: performing tonality detection on the audio data to generate compensation control data indicative of whether each frequency band in the set of low frequency bands has prominent tonal content; and performing low frequency compensation on the audio data in each frequency band in the set of low frequency bands having prominent tonal content as indicated by the compensation control data, but not performing low frequency compensation on the audio data in any other frequency band in the set of low frequency bands.

    摘要翻译： 一种用于确定要编码的频域音频数据的音频数据值的尾数位分配的方法。 分配方法包括通过对音频数据的一组低频带的每个频带的音频数据执行自适应低频补偿来确定音频数据值的屏蔽值的步骤。 所述自适应低频补偿包括以下步骤：对所述音频数据执行音调检测，以产生指示所述一组低频带中的每个频带是否具有突出的音调内容的补偿控制数据; 对由该补偿控制数据所表示的具有突出色调内容的低频带组中的每个频带中的音频数据执行低频补偿，而不对该组中的任何其它频带中的音频数据执行低频补偿 的低频带。