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    GENERATION OF A COMFORT NOISE WITH HIGH SPECTRO-TEMPORAL RESOLUTION IN DISCONTINUOUS TRANSMISSION OF AUDIO SIGNALS
    9.
    发明公开
    GENERATION OF A COMFORT NOISE WITH HIGH SPECTRO-TEMPORAL RESOLUTION IN DISCONTINUOUS TRANSMISSION OF AUDIO SIGNALS 有权
    舒适噪声的生成HIGH频谱 - 时间分辨率的音频信号的不连续传输

    公开(公告)号：EP2936487A1

    公开(公告)日：2015-10-28

    申请号：EP13819029.3

    申请日：2013-12-19

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

    发明人： LOMBARD, Anthony ,  DIETZ, Martin ,  WILDE, Stephan ,  RAVELLI, Emmanuel ,  SETIAWAN, Panji ,  MULTRUS, Markus

    IPC分类号： G10L19/012

    CPC分类号： G10L19/012 ,  G10L19/002 ,  G10L19/24

    摘要： the invention provides an audio decoder being configured for decoding a bit- stream so as to produce therefrom an audio output signal, the bitstream comprising at least an active phase followed by at least an inactive phase, wherein the bitstream has encoded therein at least a silence insertion descriptor frame which describes a spectrum of a background noise, the audio decoder comprising: a silence insertion descriptor decoder configured to decode the silence insertion descriptor frame so as to reconstruct a spectrum of the background noise; a decoding device configured to reconstruct the audio output signal from the bitstream during the active phase; a spectral converter configured to determine a spectrum of the audio output signal a noise estimator device configured to determine a first spectrum of the noise of the audio output signal based on the spectrum of the audio output signal provided by the spectral converter, wherein the first spectrum of the noise of the audio output signal has a higher spectral resolution than the spectrum of the background noise; a resolution converter configured to establish a second spectrum of the noise of the audio output signal based on the first spectrum of the noise of the au- dio output signal, wherein the second spectrum of the noise of the audio output signal has a same spectral resolution as the spectrum of the background noise; a comfort noise spectrum estimation device having a scaling factor computing device configured to compute scaling factors for a spectrum for a comfort noise based on the spectrum of the background noise as provided by the silence insertion descriptor decoder and based on the second spectrum of the noise of the audio output signal as provided by the resolution converter and having a comfort noise spectrum generator configured to compute the spectrum for a comfort noise based on the scaling factors; and a comfort noise generator configured to produce the comfort noise during the inactive phase based on the spectrum for the comfort noise.

    APPARATUS AND METHOD FOR AUDIO ENCODING AND DECODING EMPLOYING SINUSOIDAL SUBSTITUTION
    10.
    发明公开
    APPARATUS AND METHOD FOR AUDIO ENCODING AND DECODING EMPLOYING SINUSOIDAL SUBSTITUTION 有权
    DEVICE AND METHOD FOR音频编码和解码音频窦代换

    公开(公告)号：EP2673776A1

    公开(公告)日：2013-12-18

    申请号：EP12818512.1

    申请日：2012-12-21

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

    发明人： DISCH, Sascha ,  SCHUBERT, Benjamin ,  GEIGER, Ralf ,  DIETZ, Martin

    IPC分类号： G10L19/032

    CPC分类号： G10L19/02 ,  G10L19/032

    摘要： An apparatus for generating an audio output signal based on an encoded audio signal spectrum is provided. The apparatus comprises a processing unit (110), a pseudo coefficients determiner (120), a spectrum modification unit (130), a spectrum-time conversion unit (140), a controllable oscillator (150) and a mixer (160). The pseudo coefficients determiner (120) is configured to determine one or more pseudo coefficients of the decoded audio signal spectrum, each of the pseudo coefficients having a spectral location and a spectral value. The spectrum modification unit (130) is configured to set the one or more pseudo coefficients to a predefined value to obtain a modified audio signal spectrum. The spectrum- time conversion unit (140) is configured to convert the modified audio signal spectrum to a time-domain to obtain a time-domain conversion signal. The controllable oscillator (150) is configured to generate a time-domain oscillator signal, the controllable oscillator (150) being controlled by the spectral location and the spectral value of at least one of the one or more pseudo coefficients. The mixer (160) is configured to mix the time-domain conversion signal and the time-domain oscillator signal to obtain the audio output signal.