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1. 发明申请

WO2007120452A1 AUDIO SIGNAL LOUDNESS MEASUREMENT AND MODIFICATION IN THE MDCT DOMAIN 审中-公开
标题翻译：音频信号测量和修改在MDCT领域
公开(公告)号：WO2007120452A1
公开(公告)日：2007-10-25
申请号：PCT/US2007/007945
申请日：2007-03-30
申请人： DOLBY LABORATORIES LICENSING CORPORATION , SEEFELDT, Alan Jeffrey , CROCKETT, Brett Graham , SMITHERS, Michael John
发明人： SEEFELDT, Alan Jeffrey , CROCKETT, Brett Graham , SMITHERS, Michael John
IPC分类号： G10L19/00 , H04M3/22
CPC分类号： G10L25/69 , G10L19/0212
摘要： Processing an audio signal represented by the Modified Discrete Cosine Transform (MDCT) of a time-sampled real signal is disclosed in which the loudness of the transformed audio signal is measured, and at least in part in response to the measuring, the loudness of the transformed audio signal is modified. When gain modifying more than one frequency band, the variation or variations in gain from frequency band to frequency band, is smooth. The loudness measurement employs a smoothing time constant commensurate with the integration time of human loudness perception or slower.
摘要翻译：公开了处理由时间采样实信号的修正离散余弦变换（MDCT）表示的音频信号，其中测量变换音频信号的响度，并且至少部分地响应于测量，响度变换后的音频信号被修改。当增益改变多于一个频带时，从频带到频带的增益的变化或变化是平滑的。响度测量使用与人类响度感知的积分时间相对应的平滑时间常数或更慢。

2. 发明申请

WO2008021110A2 AUDIO-PEAK LIMITING IN SLOW AND FAST STAGES 审中-公开
标题翻译：音频限制在缓慢和快速的阶段
公开(公告)号：WO2008021110A2
公开(公告)日：2008-02-21
申请号：PCT/US2007/017588
申请日：2007-08-08
申请人： DOLBY LABORATORIES LICENSING CORPORATION , SMITHERS, Michael John , CROCKETT, Brett Graham , MCGRATH, David Stanley
发明人： SMITHERS, Michael John , CROCKETT, Brett Graham , MCGRATH, David Stanley
CPC分类号： H03G7/007 , H03G11/008
摘要： A method and apparatus for limiting the absolute magnitude of an audio signal. The method may include firstly variable-gain reducing the gain of an audio signal, and then secondly variable-gain reducing the gain of the audio signal faster than the first variable-gain reduction, thereby limiting the absolute magnitude of the audio signal to a threshold. The first variable-gain reduction may include variable-gain reducing the gain of the audio signal in a first stage, and the second variable-gain reduction may include variable-gain reducing the gain of the audio signal in a second stage that reduces the gain faster than the first stage. The second variable-gain reduction may include delaying the audio signal, finding a peak among the delayed audio signal, calculating a fast gain from a found peak, and modifying the delayed audio signal with the calculated fast gain.
摘要翻译：一种用于限制音频信号的绝对幅度的方法和装置。该方法可以首先包括减小音频信号的增益的可变增益，然后可以增加第二可变增益，从而比第一可变增益减小更快地减小音频信号的增益，从而将音频信号的绝对幅度限制到阈值。第一可变增益减小可以包括在第一阶段减小音频信号的增益的可变增益，并且第二可变增益减小可以包括在减小增益的第二级中减小音频信号的增益的可变增益比第一阶段快。第二可变增益减小可以包括延迟音频信号，在延迟的音频信号中找到峰值，从找到的峰值计算快速增益，以及用所计算的快速增益修改延迟的音频信号。

3. 发明申请

WO2007123608A1 LOUDNESS MODIFICATION OF MULTICHANNEL AUDIO SIGNALS 审中-公开
标题翻译：多声道音频信号的修改
公开(公告)号：WO2007123608A1
公开(公告)日：2007-11-01
申请号：PCT/US2007/006444
申请日：2007-03-14
申请人： DOLBY LABORATORIES LICENSING CORPORATION , SEEFELDT, Alan Jeffrey , SMITHERS, Michael John
发明人： SEEFELDT, Alan Jeffrey , SMITHERS, Michael John
IPC分类号： H03G3/10
CPC分类号： H03G3/20 , H03G3/10 , H03G9/005 , H03G9/025 , H03G9/18 , H04R5/04 , H04S2400/13
摘要： Scaling, by a desired amount s m, the overall perceived loudness L m of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P , by scaling the perceived loudness of each individual channel L c by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels s m , subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling s m . The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling
摘要翻译：缩放所需量的s

4. 发明申请

WO2007106551A1 STEREOPHONIC SOUND IMAGING 审中-公开
公开(公告)号：WO2007106551A1
公开(公告)日：2007-09-20
申请号：PCT/US2007/006520
申请日：2007-03-14
申请人： DOLBY LABORATORIES LICENSING CORPORATION , COOK, Bryan Austin , SMITHERS, Michael John
发明人： COOK, Bryan Austin , SMITHERS, Michael John
IPC分类号： H04S1/00
CPC分类号： H04S1/002 , H04R2499/13
摘要： A method for reducing phase differences varying with frequency occurring at certain listening positions with respect to loudspeakers reproducing respective ones of multiple sound channels in a listening space, the phase differences occurring in a sequence of frequency bands in which the phase differences alternate between being predominantly in-phase and predominantly out-of-phase, comprises adjusting the phase in multiple frequency bands in which the multiple sound channels are out-of-phase at such listening positions. Such adjustment of phase includes the frequency bands in which the width of comb filtering pass bands and notches resulting from phase differences at such listening positions would be greater than or commensurate with the critical band width if the phase adjustment were not applied. The listening space may be the interior of a vehicle.
摘要翻译：一种用于减少相对于相对于在收听空间中再现多个声道中的相应声道的扬声器发生在某些收听位置处的频率而变化的相位差的方法，所述相位差出现在频带序列中，其中相位差主要在相位并且主要是异相的，包括调整多个频带中的相位，其中多个声道在这种听音位置处于异相位置。这样的相位调整包括如果没有施加相位调整，梳状滤波通带的宽度和在这种收听位置处的相位差产生的切口将大于或等于临界带宽的频带。聆听空间可以是车辆的内部。

5. 发明授权

EP2002426B1 AUDIO SIGNAL LOUDNESS MEASUREMENT AND MODIFICATION IN THE MDCT DOMAIN 有权
标题翻译：体积测量音频信号和CHANGE MDCT AREA
公开(公告)号：EP2002426B1
公开(公告)日：2009-09-02
申请号：EP07754462.5
申请日：2007-03-30
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SEEFELDT, Alan Jeffrey , CROCKETT, Brett Graham , SMITHERS, Michael John
IPC分类号： G10L19/00
CPC分类号： G10L25/69 , G10L19/0212
摘要： Processing an audio signal represented by the Modified Discrete Cosine Transform (MDCT) of a time-sampled real signal is disclosed in which the loudness of the transformed audio signal is measured, and at least in part in response to the measuring, the loudness of the transformed audio signal is modified. When gain modifying more than one frequency band, the variation or variations in gain from frequency band to frequency band, is smooth. The loudness measurement employs a smoothing time constant commensurate with the integration time of human loudness perception or slower.

6. 发明公开

EP2070191A2 AUDIO-PEAK LIMITING IN SLOW AND FAST STAGES 有权
标题翻译：音频峰值限制
公开(公告)号：EP2070191A2
公开(公告)日：2009-06-17
申请号：EP07836595.4
申请日：2007-08-08
申请人： Dolby Laboratories Licensing Corporation
发明人： SMITHERS, Michael John , CROCKETT, Brett Graham , MCGRATH, David Stanley
IPC分类号： H03G7/00 , H03G11/00
CPC分类号： H03G7/007 , H03G11/008
摘要： A method and apparatus for limiting the absolute magnitude of an audio signal. The method may include firstly variable-gain reducing the gain of an audio signal, and then secondly variable-gain reducing the gain of the audio signal faster than the first variable-gain reduction, thereby limiting the absolute magnitude of the audio signal to a threshold. The first variable-gain reduction may include variable-gain reducing the gain of the audio signal in a first stage, and the second variable-gain reduction may include variable-gain reducing the gain of the audio signal in a second stage that reduces the gain faster than the first stage. The second variable-gain reduction may include delaying the audio signal, finding a peak among the delayed audio signal, calculating a fast gain from a found peak, and modifying the delayed audio signal with the calculated fast gain.

7. 发明公开

EP2002426A1 AUDIO SIGNAL LOUDNESS MEASUREMENT AND MODIFICATION IN THE MDCT DOMAIN 有权
标题翻译：体积测量音频信号和CHANGE MDCT AREA
公开(公告)号：EP2002426A1
公开(公告)日：2008-12-17
申请号：EP07754462.5
申请日：2007-03-30
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SEEFELDT, Alan Jeffrey , CROCKETT, Brett Graham , SMITHERS, Michael John
IPC分类号： G10L19/00
CPC分类号： G10L25/69 , G10L19/0212
摘要： Processing an audio signal represented by the Modified Discrete Cosine Transform (MDCT) of a time-sampled real signal is disclosed in which the loudness of the transformed audio signal is measured, and at least in part in response to the measuring, the loudness of the transformed audio signal is modified. When gain modifying more than one frequency band, the variation or variations in gain from frequency band to frequency band, is smooth. The loudness measurement employs a smoothing time constant commensurate with the integration time of human loudness perception or slower.

8. 发明授权

EP2002539B1 LOUDNESS MODIFICATION OF MULTICHANNEL AUDIO SIGNALS 有权
标题翻译：卷修改多声道信号
公开(公告)号：EP2002539B1
公开(公告)日：2010-12-01
申请号：EP07753095.4
申请日：2007-03-14
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SEEFELDT, Alan Jeffrey , SMITHERS, Michael John
IPC分类号： H03G9/02
CPC分类号： H03G3/20 , H03G3/10 , H03G9/005 , H03G9/025 , H03G9/18 , H04R5/04 , H04S2400/13
摘要： Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling

9. 发明公开

EP2002539A1 LOUDNESS MODIFICATION OF MULTICHANNEL AUDIO SIGNALS 有权
标题翻译：卷修改多声道信号
公开(公告)号：EP2002539A1
公开(公告)日：2008-12-17
申请号：EP07753095.4
申请日：2007-03-14
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： SEEFELDT, Alan Jeffrey , SMITHERS, Michael John
IPC分类号： H03G3/10
CPC分类号： H03G3/20 , H03G3/10 , H03G9/005 , H03G9/025 , H03G9/18 , H04R5/04 , H04S2400/13
摘要： Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling

10. 发明授权

EP2070191B1 AUDIO-PEAK LIMITING IN SLOW AND FAST STAGES 有权
标题翻译： AUDIOSPITZENWERTBEGRENZUNG
公开(公告)号：EP2070191B1
公开(公告)日：2012-11-21
申请号：EP07836595.4
申请日：2007-08-08
申请人： Dolby Laboratories Licensing Corporation
发明人： SMITHERS, Michael John , CROCKETT, Brett Graham , MCGRATH, David Stanley
IPC分类号： H03G7/00 , H03G11/00
CPC分类号： H03G7/007 , H03G11/008

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