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31 条记录 (耗时 0.025 秒)

    Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods
    11.
    发明公开
    Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods 有权
    调制复指数滤波器组和自适应时间信令方法的基础上先进的加工

    公开(公告)号：EP2265041A3

    公开(公告)日：2011-05-25

    申请号：EP10180688.3

    申请日：2004-04-30

    申请人： Dolby International AB

    发明人： Engdegard, Jonas ,  Villemoes, Lars

    IPC分类号： H04S3/00 ,  G10L19/00

    CPC分类号： G10L19/008 ,  G10L19/0204 ,  H03H17/0266 ,  H04S5/00 ,  H04S2420/03

    摘要： A synthesizer for generating a decorrelation signal using an input signal is operative on a plurality of subband signals, wherein a subband signal includes a sequence of at least two subband samples, the sequence of the subband samples representing a bandwidth of the subband signal, which is smaller than a bandwidth of the input signal. The synthesizer includes a filter stage (201) for filtering each subband signal using a reverberation filter to obtain a plurality of reverberated subband signals, wherein a plurality of reverberated subband signals together represent the decorrelation signal. This decorrelation signal is used for reconstructing a signal based on a parametrically encoded stereo signal consisting of a mono signal and a coherence measure.

    Method and receiver for high frequency reconstruction of a stereo audio signal
    15.
    发明授权
    Method and receiver for high frequency reconstruction of a stereo audio signal 有权
    用于立体声音频信号的高频重建的方法和接收器

    公开(公告)号：EP2249336B1

    公开(公告)日：2012-09-12

    申请号：EP10174492.8

    申请日：2002-07-10

    申请人： Dolby International AB

    发明人： Henn, Frederik ,  Kjörling, Kristofer ,  Liljeryd, Lars ,  Röden, Jonas ,  Engdegard, Jonas

    IPC分类号： G10L19/00 ,  H04S1/00 ,  G10L19/02 ,  H04S5/00

    CPC分类号： G10L19/24 ,  G10L19/008 ,  G10L19/0204 ,  H04S1/007 ,  H04S3/002

    摘要： The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.