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    • 3. 发明申请
    • AN APPARATUS AND A METHOD FOR CALCULATING A NUMBER OF SPECTRAL ENVELOPES
    • 一种用于计算多个谱包络的装置和方法
    • WO2010003546A2
    • 2010-01-14
    • PCT/EP2009/004523
    • 2009-06-23
    • FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E .V.NEUENDORF, MaxGRILL, BernhardKRAEMER, UlrichMULTRUS, MarkusPOPP, HaraldRETTELBACH, NikolausNAGEL, FrederikLOHWASSER, MarkusGAYER, MarcJANDER, ManuelBACIGALUPO, Virgilio
    • NEUENDORF, MaxGRILL, BernhardKRAEMER, UlrichMULTRUS, MarkusPOPP, HaraldRETTELBACH, NikolausNAGEL, FrederikLOHWASSER, MarkusGAYER, MarcJANDER, ManuelBACIGALUPO, Virgilio
    • G10L21/02G10L19/02
    • 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).
    • 一种设备(100)计算将由频谱带复制(SBR)编码器导出的谱包络(104)的数量(102),其中SBR编码器适于编码音频信号( (t0)延伸至最终时间(tn)的SBR帧中的预定数量的后续时间部分(110)内的多个采样值,所述预定数量的后续时间部分(110) 以由音频信号(105)给出的时间顺序排列。 装置(100)包括用于确定判决值(125)的判定值计算器(120),判定值(125)测量一对相邻时间部分的频谱能量分布中的偏差。 所述设备(100)还包括用于由所述判决值(125)检测阈值的违反(135)的检测器(130)和用于确定所述一对相邻时间之间的第一包络边界(145)的处理器(140) 当检测到阈值的违反(135)时的部分。 装置(100)还包括处理器(150),用于确定不同的一对相邻时间部分之间或者在初始时间(t0)或者在最后时间(tn)之间的第二包络边界(155) 第一包络边界(145)基于另一个对的阈值的违反(135)或基于SBR帧中该对或不同对的时间位置。 该设备(100)还包括用于建立具有第一包络边界(145)和第二包络边界(155)的频谱包络(104)的数量(102)的号码处理器(160)。