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    • 1. 发明申请
    • AN APPARATUS AND A METHOD FOR CALCULATING A NUMBER OF SPECTRAL ENVELOPES
    • 一种用于计算多个光谱包络的装置和方法
    • WO2010003546A3
    • 2010-03-04
    • PCT/EP2009004523
    • 2009-06-23
    • FRAUNHOFER GES FORSCHUNGNEUENDORF MAXGRILL BERNHARDKRAEMER ULRICHMULTRUS MARKUSPOPP HARALDRETTELBACH NIKOLAUSNAGEL FREDERIKLOHWASSER MARKUSGAYER MARCJANDER MANUELBACIGALUPO VIRGILIO
    • NEUENDORF MAXGRILL BERNHARDKRAEMER ULRICHMULTRUS MARKUSPOPP HARALDRETTELBACH NIKOLAUSNAGEL FREDERIKLOHWASSER MARKUSGAYER MARCJANDER MANUELBACIGALUPO VIRGILIO
    • G10L21/02G10L19/02G10L19/14
    • G10L21/038G10L19/0208G10L19/025G10L19/20
    • An apparatus (100) calculates a number (102) of spectral envelopes (104) to be derived by a spectral band replication (SBR) encoder, wherein the SBR encoder is adapted to encode an audio signal (105) using a plurality of sample values within a predetermined number of subsequent time portions (110) in an SBR frame extending from an initial time (t0) to a final time (tn), the predetermined number of subsequent time portions (110) being arranged in a time sequence given by the audio signal (105). The apparatus (100) comprises a decision value calculator (120) for determining a decision value (125), the decision value (125) measuring a deviation in spectral energy distributions of a pair of neighboring time portions. The apparatus (100) further comprises a detector (130) for detecting a violation (135) of a threshold by the decision value (125) and a processor (140) for determining a first envelope border (145) between the pair of neighboring time portions when the violation (135) of the threshold is detected. The apparatus (100) further comprises a processor (150) for determining a second envelope border (155) between a different pair of neighboring time portions or at the initial time (t0) or at the final time (tn) for an envelope having the first envelope border (145) based on the violation (135) of the threshold for the other pair or based on a temporal position of the pair or the different pair in the SBR frame. The apparatus (100) further comprises a number processor (160) for establishing the number (102) of spectral envelopes (104) having the first envelope border (145) and the second envelope border (155).
    • 一种装置(100)计算由谱带复制(SBR)编码器导出的频谱包络(104)的数目(102),其中SBR编码器适于使用多个采样值对音频信号(105)进行编码 在从初始时间(t0)延伸到最后时间(tn)的SBR帧中的预定数量的后续时间部分(110)中,预定数量的后续时间部分(110)按照由 音频信号(105)。 装置(100)包括用于确定判定值(125)的判定值计算器(120),所述判定值(125)测量一对相邻时间部分的频谱能量分布的偏差。 所述设备(100)还包括检测器(130),用于通过所述判定值(125)检测阈值的违规(135);以及处理器(140),用于确定所述一对相邻时间之间的第一包络边界(145) 当检测到阈值的违规(135)时的部分。 所述装置(100)还包括处理器(150),用于确定不同对相邻时间部分之间的第二信封边界(155),或者在具有所述相邻时间部分的信封的初始时间(t0)或最后时间(tn) 基于另一对的阈值的违规(135)或者基于SBR帧中的对或不同对的时间位置的第一包络边界(145)。 所述设备(100)还包括用于建立具有所述第一信封边界(145)和所述第二信封边界(155)的频谱包络(104)的数量(102)的数字处理器(160)。