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    • 1. 发明申请
    • IMPROVEMENT OF AN AUDIO SIGNAL OF AN FM STEREO RADIO RECEIVER BY USING PARAMETRIC STEREO
    • 用参数立体声改进FM立体声无线电接收机的音频信号
    • WO2011029570A8
    • 2011-03-17
    • PCT/EP2010/005481
    • 2010-09-07
    • DOLBY INTERNATIONAL ABENGDEGARD, JonasPURNHAGEN, HeikoROEDEN, Karl, Jonas
    • ENGDEGARD, JonasPURNHAGEN, HeikoROEDEN, Karl, Jonas
    • H04S1/00H04S5/00H04H40/45H04B1/16H04H40/81
    • The invention relates to an apparatus for improving a stereo audio signal of an FM stereo radio receiver. The apparatus comprises a parametric stereo (PS) parameter estimation stage. The parameter estimation stage is configured to determine one or more parametric stereo parameters based on the stereo audio signal in a frequency-variant or frequency-invariant manner. Preferably, these PS parameters are time- and frequency-variant. Moreover, the apparatus comprises an upmix stage. The upmix stage is configured to generate the improved stereo signal based on a first audio signal and the one or more parametric stereo parameters. The first audio signal is obtained from the stereo audio signal, e.g. by a downmix operation in a downmix stage. The PS parameter estimation stage may be part of a PS encoder. The upmix stage may be part of a PS decoder.
    • 本发明涉及一种用于改善FM立体声无线电接收机的立体声音频信号的设备。 该设备包括参数立体声(PS)参数估计阶段。 参数估计级被配置为以频率变化或频率不变的方式基于立体声音频信号确定一个或多个参数立体声参数。 优选地,这些PS参数是时间和频率变化的。 此外,该设备包括上混阶段。 上混级被配置为基于第一音频信号和一个或多个参数立体声参数来生成改进的立体声信号。 第一音频信号是从立体声音频信号获得的,例如, 通过缩混阶段的缩混操作。 PS参数估计阶段可以是PS编码器的一部分。 上混阶段可能是PS解码器的一部分。
    • 2. 发明申请
    • REDUCTION OF SPURIOUS UNCORRELATION IN FM RADIO NOISE
    • 减少FM无线电噪声中的不寻常的不符合
    • WO2012025429A1
    • 2012-03-01
    • PCT/EP2011/064077
    • 2011-08-16
    • DOLBY INTERNATIONAL ABENGDEGARD, JonasPURNHAGEN, HeikoSEHLSTROM, Leif
    • ENGDEGARD, JonasPURNHAGEN, HeikoSEHLSTROM, Leif
    • H04B1/16G10L19/00H04S1/00
    • H04R5/04G10L19/008H04B1/1676H04S1/007
    • The document relates to audio signal processing, in particular to a system and a corresponding method for improving an audio signal of an FM stereo radio receiver, in this context, one aspect relates to the estimation of noise in a received side signal and the compensation of such noise in parametric stereo parameters. A system for generating a parametric stereo parameter from a two-channel audio signal is described. The two-channel audio signal is presentable as a mid signal and side signal representative of a corresponding left and right audio signal. The system comprises a noise estimation stage configured to determine an impact factor characteristic for the noise of the side signal; and a parametric stereo parameter estimation stage configured to determine the parametric stereo parameter; wherein the determining is based on the two-channel audio signal and the impact factor.
    • 本文件涉及音频信号处理,具体涉及用于改进FM立体声无线电接收机的音频信号的系统和相应方法,在本上下文中,一个方面涉及接收侧信号中的噪声估计和 这样的噪声参数立体声参数。 描述了一种用于从双声道音频信号产生参数立体声参数的系统。 双声道音频信号可以作为表示相应的左和右音频信号的中间信号和侧面信号呈现。 该系统包括噪声估计级,其被配置为确定侧信号的噪声的影响因子特性; 以及被配置为确定所述参数立体声参数的参数立体声参数估计级; 其中所述确定基于所述双声道音频信号和所述影响因子。
    • 3. 发明申请
    • CONCEALMENT OF INTERMITTENT MONO RECEPTION OF FM STEREO RADIO RECEIVERS
    • FM立体声无线电接收机的间接单声道接收
    • WO2012025431A2
    • 2012-03-01
    • PCT/EP2011/064084
    • 2011-08-16
    • DOLBY INTERNATIONAL ABSEHLSTROM, LeifPURNHAGEN, HeikoENGDEGARD, Jonas
    • SEHLSTROM, LeifPURNHAGEN, HeikoENGDEGARD, Jonas
    • G10L19/00
    • H04R5/00G10L19/005G10L19/008G10L21/0364H04B1/1676H04H40/81
    • The present invention relates to audio signal processing. In particular, it relates to a method and system for reliably concealing intermittent mono reception of FM stereo radio receivers. The system comprises a parametric stereo parameter estimation stage configured to determine a first parametric stereo parameter based on a first frame of the received two-channel audio signal. The system further comprises a concealment detection stage configured to determine an energy of a side signal within the first signal frame; determine a number of following successive signal frames during which the energy of the side signal drops from a value above the high threshold to a value below a low threshold; determine that the two-channel audio signal following the first signal frame is a forced mono signal if the number of successive signal frames is below a frame threshold; and determine the parametric stereo parameter based on the first parametric stereo parameter.
    • 本发明涉及音频信号处理。 特别涉及用于可靠地隐藏FM立体声无线电接收机的间歇单声道接收的方法和系统。 该系统包括参数立体声参数估计级,其被配置为基于所接收的双声道音频信号的第一帧来确定第一参数立体声参数。 所述系统还包括隐藏检测级,被配置为确定所述第一信号帧内的侧信号的能量; 确定随后的连续信号帧的数量,在此期间,侧信号的能量从高于高阈值的值下降到低于低阈值的值; 如果连续信号帧的数量低于帧阈值,则确定跟随第一信号帧的双声道音频信号是强制单声道信号; 并根据第一参数立体声参数确定参数立体声参数。