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    TIME WARPED MODIFIED TRANSFORM CODING OF AUDIO SIGNALS
    31.
    发明公开
    TIME WARPED MODIFIED TRANSFORM CODING OF AUDIO SIGNALS 审中-公开

    公开(公告)号：EP4290512A3

    公开(公告)日：2024-02-14

    申请号：EP23205462.7

    申请日：2006-10-24

    申请人： Dolby International AB

    发明人： VILLEMOES, Lars

    IPC分类号： G10L19/022 ,  G10L19/02

    摘要： A spectral representation of an audio signal having consecutive audio frames can be derived more efficiently, when a common time warp is estimated for any two neighbouring frames, such that a following block transform can additionally use the warp information. Thus, window functions required for successful application of an overlap and add procedure during reconstruction can be derived and applied, the window functions already anticipating the re-sampling of the signal due to the time warping. Therefore, the increased efficiency of block-based transform coding of time-warped signals can be used without introducing audible discontinuities.

    ADAPTIVE BANDWIDTH EXTENSION AND APPARATUS FOR THE SAME
    36.
    发明公开
    ADAPTIVE BANDWIDTH EXTENSION AND APPARATUS FOR THE SAME 审中-公开

    公开(公告)号：EP4258261A3

    公开(公告)日：2023-12-20

    申请号：EP23168838.3

    申请日：2014-09-09

    申请人： Huawei Technologies Co., Ltd.

    发明人： GAO, Yang

    IPC分类号： G10L21/038 ,  G10L19/02 ,  G10L19/08

    摘要： In one embodiment of the present invention, a method of decoding an encoded audio bitstream and generating frequency bandwidth extension includes decoding the audio bitstream to produce a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band. A sub-band area is selected from within the low frequency band using a parameter which indicates energy information of a spectral envelope of the decoded low band audio signal. A high band excitation spectrum is generated for a high frequency band by copying a sub-band excitation spectrum from the selected sub-band area to a high sub-band area corresponding to the high frequency band. Using the generated high band excitation spectrum, an extended high band audio signal is generated by applying a high band spectral envelope. The extended high band audio signal is added to the decoded low band audio signal to generate an audio output signal having an extended frequency bandwidth.

    AUDIO SIGNAL PROCESSING METHOD AND PARAMETERIZATION DEVICE FOR SAME
    39.
    发明公开
    AUDIO SIGNAL PROCESSING METHOD AND PARAMETERIZATION DEVICE FOR SAME 审中-公开

    公开(公告)号：EP4246513A2

    公开(公告)日：2023-09-20

    申请号：EP23190101.8

    申请日：2014-12-23

    申请人： Wilus Institute of Standards and Technology Inc. ,  GCoA Co., Ltd.

    发明人： OH, Hyunoh ,  LEE, Taegyu

    IPC分类号： G10L19/02

    摘要： The present invention relates to an audio signal processing method, a parameterization device and an audio signal processing device for the same, and more particularly, to an audio signal processing method to implement filtering of an input audio signal with a low computational complexity, and a parameterization device and an audio signal processing device for the same.
    To this end, provided are a method for processing an audio signal, including: receiving an input audio signal; receiving at least one binaural room impulse response (BRIR) filter coefficients for binaural filtering of the input audio signal; converting the BRIR filter coefficients into a plurality of subband filter coefficients; obtaining flag information indicating whether the length of the BRIR filter coefficients in a time domain is more than a predetermined value; truncating each subband filter coefficients based on filter order information obtained by at least partially using characteristic information extracted from the corresponding subband filter coefficients, the truncated subband filter coefficients being filter coefficients of which energy compensation is performed based on the flag information and the length of at least one truncated subband filter coefficients being different from the length of the truncated subband filter coefficients of another subband; and filtering each subband signal of the input audio signal by using the truncated subband filter coefficients, and a parameterization device and an audio signal processing device for the same.

    APPARATUS AND METHOD FOR DECODING OR ENCODING AN AUDIO SIGNAL USING ENERGY INFORMATION VALUES FOR A RECONSTRUCTION BAND
    40.
    发明公开
    APPARATUS AND METHOD FOR DECODING OR ENCODING AN AUDIO SIGNAL USING ENERGY INFORMATION VALUES FOR A RECONSTRUCTION BAND 审中-公开

    公开(公告)号：EP4246512A2

    公开(公告)日：2023-09-20

    申请号：EP23188679.7

    申请日：2014-07-15

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： NIEDERMEIER, Andreas ,  ERTEL, Christian ,  GEIGER, Ralf ,  GHIDO, Florin ,  HELMRICH, Christian

    IPC分类号： G10L19/02

    摘要： An apparatus for decoding an encoded audio signal comprising an encoded representation of a first set of first spectral portions and an encoded representation of parametric data indicating spectral energies for a second set of second spectral portions, comprises: an audio decoder (900) for decoding the encoded representation (901b) of the first set of the first spectral portions to obtain a first set of first spectral portions (904) and for decoding the encoded representation of the parametric data to obtain a decoded parametric data (902) for the second set of second spectral portions indicating, for individual reconstruction bands, individual energies; a frequency regenerator (906) for reconstructing spectral values in a reconstruction band (920) comprising a second spectral portion (922, 923) using a first spectral portion of the first set of the first spectral portions and an individual energy for the reconstruction band, the reconstruction band comprising a first spectral portion (921) and the second spectral portion; wherein the frequency regenerator (906) is configured for determining (912) a survive energy information comprising an accumulated energy of the first spectral portion having frequency values in the reconstruction band, determining (918) a tile energy information of further spectral portions (922, 923) of the reconstruction band (920) for frequency values different from the first spectral portion (921) having frequencies in the reconstruction band (920), wherein the further spectral portions (922, 923) are to be generated by frequency regeneration using a first spectral portion (302) different from the first spectral portion (921, 306) in the reconstruction band; determining (914) a missing energy in the reconstruction band (920) using the individual energy for the reconstruction band and the survive energy information; and adjusting (916) the further spectral portions in the reconstruction band based on the missing energy information and the tile energy information.