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1. 发明申请

WO2008021110A3 AUDIO-PEAK LIMITING IN SLOW AND FAST STAGES 审中-公开
标题翻译：音频峰值限制在慢速和快速阶段
公开(公告)号：WO2008021110A3
公开(公告)日：2008-06-05
申请号：PCT/US2007017588
申请日：2007-08-08
申请人： DOLBY LAB LICENSING CORP , SMITHERS MICHAEL JOHN , CROCKETT BRETT GRAHAM , MCGRATH DAVID STANLEY
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.
摘要翻译：一种用于限制音频信号的绝对量值的方法和设备。该方法可以首先包括可变增益降低音频信号的增益，然后可变增益比第一可变增益降低更快地降低音频信号的增益，由此将音频信号的绝对量限制为阈值。第一可变增益降低可以包括降低第一级中的音频信号的增益的可变增益，并且第二可变增益降低可以包括降低第二级中的音频信号的增益的可变增益，比第一阶段快。第二可变增益降低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，以及用计算的快速增益修改延迟的音频信号。

2. 发明专利

CA2604796C ECONOMICAL LOUDNESS MEASUREMENT OF CODED AUDIO 未知
公开(公告)号：CA2604796C
公开(公告)日：2014-06-03
申请号：CA2604796
申请日：2006-03-23
申请人： DOLBY LAB LICENSING CORP
发明人： CROCKETT BRETT GRAHAM , SMITHERS MICHAEL JOHN , SEEFELDT ALAN JEFFREY
IPC分类号： H04S7/00
摘要： Measuring the loudness of audio encoded in a bitstream that includes data from which an approximation of the power spectrum of the audio can be derived without fully decoding the audio is performed by deriving the approximation of the power spectrum of the audio from said bitstream without fully decoding the audio, and determining an approximate loudness of the audio in response to the approximation of the power spectrum of the audio. The data may include coarse representations of the audio and associated finer representations of the audio, the approximation of the power spectrum of the audio being derived from the coarse representations of the audio. In the case of subband encoded audio, the coarse representations of the audio may comprise scale factors and the associated finer representations of the audio may comprise sample data associated with each scale factor.

3. 发明专利

ES2399295T3 Limitación de picos de audio en etapas lentas y rápidas 未知
公开(公告)号：ES2399295T3
公开(公告)日：2013-03-27
申请号：ES07836595
申请日：2007-08-08
申请人： DOLBY LAB LICENSING CORP
发明人： SMITHERS MICHAEL JOHN , CROCKETT BRETT GRAHAM , MCGRATH DAVID STANLEY
IPC分类号： H03G7/00 , H03G11/00
摘要： Un método para limitar picos en señales de audio, en el que el método comprende: - recibir una señal de audio de entrada; - detectar excursiones de la señal de audio de entrada que superan un umbral; - calcular una primera ganancia en respuesta a las excursiones detectadas; - aplicar la primera ganancia a la señal de audio de entrada para genera una señal de audio intermedia; - aplicar una línea de retardo a la señal de audio intermedia para generar una señal de audio intermedia retardada; - identificar uno o más valores de picos de la señal de audio intermedia dentro de la línea de retardo que superan elumbral; - calcular una segunda ganancia en respuesta a los valores de picos identificados, en donde las reducciones en lasegunda ganancia son más rápidas que las reducciones en la primera ganancia; y - aplicar la segunda ganancia a la señal de audio intermedia retardada para generar una señal de audio de salidacuyos valores de picos no superan el umbral.

4. 发明专利

MX2007001262A COMBINACION DE SENALES DE AUDIO QUE UTILIZA ANALISIS AUDITIVO DE ESCENA. 未知
公开(公告)号：MX2007001262A
公开(公告)日：2007-04-18
申请号：MX2007001262
申请日：2005-07-13
申请人： DOLBY LAB LICENSING CORP
发明人： SMITHERS MICHAEL JOHN
IPC分类号： H04S3/02
摘要： Un proceso para la combinacion de canales de audio combina los canales de audio a fin de producir un canal combinado de audio y aplica en forma dinamica uno o mas de los ajustes de tiempo, fase y amplitud o potencia en los canales, en el canal combinado o en ambos de los canales y el canal combinado. Uno o mas de los ajustes son controlados, por lo menos en parte, por una medicion de los eventos auditivos en uno o mas de los canales y/o el canal combinado. Las aplicaciones incluyen la presentacion de audio de multiples canales en cines y vehiculos. No solo los metodos, sino tambien las correspondientes implementaciones de programa de computadora y las implementaciones de aparato se encuentran incluidos. La figura mas representativa de la invencion es la numero 1.

5. 发明专利

AU2006237476A1 Economical loudness measurement of coded audio 未知
公开(公告)号：AU2006237476A1
公开(公告)日：2006-10-26
申请号：AU2006237476
申请日：2006-03-23
申请人： DOLBY LAB LICENSING CORP
发明人： SEEFELDT ALAN JEFFREY , CROCKETT BRETT GRAHAM , SMITHERS MICHAEL JOHN
IPC分类号： H04S7/00 , G10L19/02

6. 发明专利

AU2005262870A1 Method for correcting metadata affecting the playback loudness and dynamic range of audio information 未知
公开(公告)号：AU2005262870A1
公开(公告)日：2006-01-19
申请号：AU2005262870
申请日：2005-04-08
申请人： DOLBY LAB LICENSING CORP
发明人： SMITHERS MICHAEL JOHN , ROBINSON CHARLES QUITO , RIEDMILLER JEFFREY CHARLES , CROCKETT BRETT GRAHAM
IPC分类号： H03G3/20 , G10L11/00 , H03G7/00
摘要： A coded signal conveys encoded audio information and metadata that may be used to control the loudness and dynamic range of the audio information during its playback. If the values for these metadata parameters are set incorrectly, annoying fluctuations in loudness during playback can result. The present invention overcomes this problem by detecting incorrect metadata parameter values in the signal and replacing the incorrect values with corrected values.

7. 发明专利

CA2574834C COMBINING AUDIO SIGNALS USING AUDITORY SCENE ANALYSIS 未知
公开(公告)号：CA2574834C
公开(公告)日：2013-07-09
申请号：CA2574834
申请日：2005-07-13
申请人： DOLBY LAB LICENSING CORP
发明人： SMITHERS MICHAEL JOHN
IPC分类号： H04S3/02
摘要： A process for combining audio channels combines the audio channels to produce a combined audio channel and dynamically applies one or more of time, phase, and amplitude or power adjustments to the channels, to the combined channel, or to both the channels and the combined channel. One or more of the adjustments are controlled at least in part by a measure of auditory events in one or more of the channels and/or the combined channel. Applications include the presentation of multichannel audio in cinemas and vehicles. Not only methods, but also corresponding computer program implementations and apparatus implementations are included.

8. 发明专利

DE602007010912D1 LAUTSTÄRKENMODIFIKATION MEHRKANALIGER TONSIGNALE 未知
公开(公告)号：DE602007010912D1
公开(公告)日：2011-01-13
申请号：DE602007010912
申请日：2007-03-14
申请人： DOLBY LAB LICENSING CORP
发明人： SEEFELDT ALAN JEFFREY , SMITHERS MICHAEL JOHN
IPC分类号： H03G3/10

9. 发明专利

DE602005024812D1 METHODE FÜR DAS BEHEBEN VON VON METADATA, WELCHE DIE PLAYBACK-LAUTSTÄRKE UND DIE DYNAMIKWERTE DER AUDIOINFORMATIONEN BEEINFLUSST 未知
公开(公告)号：DE602005024812D1
公开(公告)日：2010-12-30
申请号：DE602005024812
申请日：2005-04-08
申请人： DOLBY LAB LICENSING CORP
发明人： SMITHERS MICHAEL JOHN , RIEDMILLER JEFFREY CHARLES , ROBINSON CHARLES QUITO , CROCKETT BRETT GRAHAM
IPC分类号： H03G3/20 , G10L11/00 , H03G7/00

10. 发明专利

BRPI0512882A 未知
公开(公告)号：BRPI0512882A
公开(公告)日：2008-04-15
申请号：BRPI0512882
申请日：2005-04-08
申请人： DOLBY LAB LICENSING CORP
发明人： SMITHERS MICHAEL JOHN , RIEDMILLER JEFFREY CHARLES , ROBINSON CHARLES QUITO , CROCKETT BRETT GRAHAM
IPC分类号： H03G3/20 , G10L11/00 , H03G7/00
摘要： A coded signal conveys encoded audio information and metadata that may be used to control the loudness and dynamic range of the audio information during its playback. If the values for these metadata parameters are set incorrectly, annoying fluctuations in loudness during playback can result. The present invention overcomes this problem by detecting incorrect metadata parameter values in the signal and replacing the incorrect values with corrected values.

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