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1. 发明授权

US5909664A Method and apparatus for encoding and decoding audio information representing three-dimensional sound fields 失效
标题翻译：用于对表示三维声场的音频信息进行编码和解码的方法和装置
公开(公告)号：US5909664A
公开(公告)日：1999-06-01
申请号：US862587
申请日：1997-05-23
申请人： Mark Franklin Davis , Craig Campbell Todd , Ray Milton Dolby
发明人： Mark Franklin Davis , Craig Campbell Todd , Ray Milton Dolby
IPC分类号： G10L19/02 , G06F9/445 , G10L19/00 , G11B20/00 , G11B20/10 , H03M1/12 , H03M7/30 , H04B14/04 , H04H1/00 , H04H20/91 , H04S3/00 , G10L9/00
CPC分类号： H04S3/008 , G10L19/008 , G11B20/00 , G11B20/10527 , H04H20/91
摘要： In an encoder, multiple channels of audio information representing multidimensional sound fields are split into subband signals and the subband signals in one or more subbands are combined to form composite signals. The composite signals, the subband signals not combined into a composite signal and information describing the spectral levels of subband signals combined into composite signals are assembled into an encoded output signal. The spectral level information conveys either the amplitude or power of the combined subband signals or the apparent direction of the sound field represented by the combined subband signals. In digital implementations, adaptive bit allocation may be used to reduce the informational requirements of the encoded signal.
摘要翻译：在编码器中，表示多维声场的多声道音频信息被分割为子带信号，并且将一个或多个子带中的子带信号组合以形成复合信号。复合信号，未组合成复合信号的子带信号和描述组合成复合信号的子带信号的频谱电平的信息被组合成编码的输出信号。频谱电平信息传达组合子带信号的幅度或功率或由组合子带信号表示的声场的视在方向。在数字实现中，可以使用自适应比特分配来减少编码信号的信息要求。

2. 发明授权

US08983834B2 Multichannel audio coding 有权
标题翻译：多声道音频编码
公开(公告)号：US08983834B2
公开(公告)日：2015-03-17
申请号：US10591374
申请日：2005-02-28
申请人： Mark Franklin Davis
发明人： Mark Franklin Davis
IPC分类号： G10L19/00 , G10L19/008 , H04S3/00
CPC分类号： G10L19/06 , G10L19/005 , G10L19/008 , G10L19/018 , G10L19/02 , G10L19/0204 , G10L19/025 , G10L19/26 , H04S3/00 , H04S3/008
摘要： Multiple channels of audio are combined either to a monophonic composite signal or to multiple channels of audio along with related auxiliary information from which multiple channels of audio are reconstructed, including improved downmixing of multiple audio channels to a monophonic audio signal or to multiple audio channels and improved decorrelation of multiple audio channels derived from a monophonic audio channel or from multiple audio channels. Aspects of the disclosed invention are usable in audio encoders, decoders, encode/decode systems, downmixers, upmixers, and decorrelators.
摘要翻译：音频的多个通道被组合到单声道复合信号或多个音频通道以及重构多个声道的相关辅助信息，包括将多个音频通道改进到单声道音频信号或多个音频通道的下混合，以及改进了从单声道音频通道或多个音频通道导出的多个音频通道的去相关。所公开的发明的方面可用于音频编码器，解码器，编码/解码系统，降混器，上混合器和去相关器。

3. 发明授权

US06449368B1 Multidirectional audio decoding 失效
标题翻译：多向音频解码
公开(公告)号：US06449368B1
公开(公告)日：2002-09-10
申请号：US08819582
申请日：1997-03-14
申请人： Mark Franklin Davis , Louis Dunn Fielder , Matthew Conrad Fellers
发明人： Mark Franklin Davis , Louis Dunn Fielder , Matthew Conrad Fellers
IPC分类号： H04R500
CPC分类号： H04S1/002
摘要： An audio crosstalk-cancelling network that may be implemented in software, such that when run in real time on a personal computer, the canceller has very low mips requirements and uses a small fraction of available CPU cycles. The network is particularly useful for rendering surround sound images outside the space between left and right computer multimedia loudspeakers when the audio from such sources is reproduced. The network includes two signal feedback paths, each feedback path having a time delay and frequency dependent characteristic. The frequency dependent characteristic represents the smoothed difference in the attenuation in the acoustic path between a transducer and the listener's ear farthest from said transducer and the attenuation in the acoustic path between the same transducer and the listener's ear closest to said same transducer. The smoothed difference in the attenuation is implemented by one or more simple digital filters requiring low processing power.
摘要翻译：可以以软件实现的音频串扰消除网络，使得当在个人计算机上实时运行时，消除器具有非常低的芯片要求，并且使用可用CPU周期的一小部分。当再现来自这些源的音频时，网络对于在左和右计算机多媒体扬声器之间的空间之外渲染环绕声图像特别有用。网络包括两个信号反馈路径，每个反馈路径具有时间延迟和频率相关特性。频率依赖特性表示换能器与距离所述换能器最远的收听者的耳朵之间的声学路径中的衰减的平滑差异以及相同换能器与最接近所述相同换能器的收听者耳朵之间的声学路径中的衰减。平滑的衰减差异由一个或多个需要低处理能力的简单数字滤波器来实现。

4. 发明授权

US5862228A Audio matrix encoding 失效
标题翻译：音频矩阵编码
公开(公告)号：US5862228A
公开(公告)日：1999-01-19
申请号：US803676
申请日：1997-02-21
申请人： Mark Franklin Davis
发明人： Mark Franklin Davis
IPC分类号： H04S3/02 , H04R5/00
CPC分类号： H04S3/02
摘要： A surround sound encoder, intended for implementation in software, runs in real time on a personal computer using low mips and a small fraction of available CPU cycles. In the principal application for the encoder, the Lt and Rt signals of the encoder are mixed with the Lt and Rt signals of a pre-recorded source (e.g., computer game soundtrack, CD ROM, Internet audio, etc.). Alternatively, the encoder may be used by itself or with one or more other virtual encoders to provide a totally user-generated soundfield. The encoder is implemented in either of two ways: the signal being encoded may be panned to one or more of the four inputs of a surround-sound fixed matrix encoder or the signal may be encoded by applying the signal to a surround-sound variable-matrix encoder. Phase shifting, required in the encoder, is achieved by applying a signal to two phase-shifting processes, producing two signals whose relative phase difference is sufficiently close to the desired phase shift over at least a substantial part of the frequency band of interest. Satisfactory audible results may be achieved, using very low computer processing power, when one of the phase shifting processes is implemented by a first-order all-pass filter and the other phase shifting process is implemented by only a short time delay, which also has an all-pass characteristic.
摘要翻译：用于软件实现的环绕声编码器可以在个人计算机上实时使用低速芯片和少量可用CPU周期。在编码器的主要应用中，编码器的Lt和Rt信号与预先记录的源（例如，计算机游戏音轨，CD ROM，因特网音频等）的Lt和Rt信号混合。或者，编码器可以自己或与一个或多个其他虚拟编码器一起使用以提供完全由用户生成的声场。编码器以两种方式中的任一种实现：被编码的信号可以被平移到环绕声固定矩阵编码器的四个输入中的一个或多个，或者可以通过将信号施加到环绕声可变 - 矩阵编码器。编码器所需的相移是通过将信号施加到两个相移处理来实现的，产生两个信号，其相对相位差足够接近目标频带的至少大部分的期望相移。当使用非常低的计算机处理能力时，可以获得令人满意的可听见的结果，当一个相移过程由一阶全通滤波器实现，而另一个相移过程仅通过短时间延迟来实现，一个全能的特点。

5. 发明申请

US20090299756A1 Ratio of speech to non-speech audio such as for elderly or hearing-impaired listeners 审中-公开
标题翻译：言语与非言语音的比例，如老人或听力障碍听众
公开(公告)号：US20090299756A1
公开(公告)日：2009-12-03
申请号：US12283712
申请日：2008-09-12
申请人： Mark Franklin Davis , Michael John Smithers
发明人： Mark Franklin Davis , Michael John Smithers
IPC分类号： G10L21/00
CPC分类号： G10L19/008 , G10L19/0204 , H04R5/04 , H04S3/00
摘要： A hybrid stereophonic/monophonic audio signal encoding comprises generating, in response to a discrete two-channel stereophonic audio signal, an encoded hybrid stereophonic/monophonic audio signal in which the audio signal is a discrete two-channel audio signal below a frequency fm and a single-channel monophonic audio signal above the frequency fm, generating, in response to the discrete two-channel stereophonic audio signal, spatial parameter information characterizing the discrete two-channel stereophonic audio signal above the frequency fm, and combining the hybrid stereophonic/monophonic audio signal with said spatial parameter information in such a manner that the resulting signal is decodable both by a decoder configured to decode a discrete two-channel stereophonic audio signal encoded with the same encoding as applied to the hybrid stereophonic/monophonic audio signal and by a decoder configured to decode, with the use of the spatial parameter information, the hybrid stereophonic/monophonic audio signal. A hybrid stereophonic/monophonic audio signal decoding is also provided.
摘要翻译：混合立体声/单声道音频信号编码包括响应于离散的双声道立体声音频信号产生编码的混合立体声/单声道音频信号，其中音频信号是低于频率fm的离散双声道音频信号，并且频率fm以上的单声道单声道音频信号，响应于离散双声道立体声音频信号，产生表征频率fm以上的离散双声道立体声音频信号的空间参数信息，并组合混合立体声/单声道音频信号与所述空间参数信息，使得所得到的信号可被解码器解码，解码器被配置为解码以与应用于混合立体声/单声道音频信号相同的编码编码的离散双声道立体声音频信号和解码器配置为利用空间参数信息解码混合立体声 nic /单声道音频信号。还提供了混合立体声/单声道音频信号解码。

6. 发明授权

US06233718B1 Avoiding forbidden data patterns in coded audio data 有权
标题翻译：避免编码音频数据中的禁止数据模式
公开(公告)号：US06233718B1
公开(公告)日：2001-05-15
申请号：US09175090
申请日：1998-10-19
申请人： Stephen Decker Vernon , Louis Dunn Fielder , Mark Franklin Davis
发明人： Stephen Decker Vernon , Louis Dunn Fielder , Mark Franklin Davis
IPC分类号： G06F1100
CPC分类号： H04L25/03866 , H04L25/4906
摘要： Any of several information processing techniques may be used in various information storage and transmission applications to prevent the occurrence of certain “forbidden” bit patterns. According to an encoding technique, a reversible coding process is used to generate an encoded representation of an information stream that cannot contain any forbidden data patterns. This may be accomplished by partitioning the information stream into segments and encoding each segment according to a respective encoding key that is selected such that the results of the coding process cannot contain a forbidden data pattern. According to one substitution technique, all occurrences of forbidden data patterns are replaced with permissible data patterns that do not otherwise occur in the information stream. This may be accomplished by partitioning the information stream into segments, identifying an unused data pattern in a respective segment, and carrying out the replacement of all occurrences of the forbidden data pattern in that segment. According to another substitution technique, all occurrences of a forbidden data pattern are replaced by any permissible data pattern. This may be accomplished by partitioning the information stream into segments, identifying occurrences of the substitution data pattern and the forbidden data pattern in a respective segment, constructing a flag for each occurrence, and replacing all occurrences of the forbidden data pattern in that segment with the substitution data pattern. Decoding keys, substitution data patterns, substitution flags or any other information needed to recover the original information is assembled with the modified information in a form that does not equal the forbidden data pattern.
摘要翻译：可以在各种信息存储和传输应用中使用几种信息处理技术中的任何一种来防止某些“禁止”位模式的发生。根据编码技术，使用可逆编码处理来生成不能包含任何禁止数据模式的信息流的编码表示。这可以通过将信息流分割成段并根据选择的相应编码密钥对每个段进行编码，使得编码处理的结果不能包含禁止的数据模式来实现。根据一种替代技术，所有出现的禁止数据模式都被替换为不能在信息流中出现的允许数据模式。这可以通过将信息流分割成段，识别相应段中未使用的数据模式，并执行在该段中的所有出现的禁止数据模式的替换来实现。根据另一替代技术，所有出现的禁止数据模式都被任何允许的数据模式所取代。这可以通过将信息流划分成段，识别替代数据模式和禁止数据模式在相应段中的出现，为每次出现构建标志，并且替换该段中的所有禁止数据模式的出现替代数据模式。解码密钥，替代数据模式，替换标志或恢复原始信息所需的任何其他信息以不等于禁止数据模式的形式与修改的信息进行组合。

7. 发明授权

US6021386A Coding method and apparatus for multiple channels of audio information representing three-dimensional sound fields 失效
标题翻译：用于表示三维声场的多声道音频信息的编码方法和装置
公开(公告)号：US6021386A
公开(公告)日：2000-02-01
申请号：US264781
申请日：1999-03-09
申请人： Mark Franklin Davis , Craig Campbell Todd
发明人： Mark Franklin Davis , Craig Campbell Todd
IPC分类号： G10L19/02 , G06F9/445 , G10L19/00 , G11B20/00 , G11B20/10 , H03M1/12 , H03M7/30 , H04B14/04 , H04H1/00 , H04H20/91 , H04S3/00 , G10L9/18
CPC分类号： H04S3/008 , G10L19/008 , G11B20/00 , G11B20/10527 , H04H20/91
摘要： In an encoder, multiple channels of audio information representing multidimensional sound fields are split into subband signals and the subband signals in one or more subbands are combined to form composite signals. The composite signals, the subband signals not combined into a composite signal and information describing the spectral levels of subband signals combined into composite signals are assembled into an encoded output signal. The spectral level information conveys either the amplitude or power of the combined subband signals or the apparent direction of the sound field represented by the combined subband signals. In digital implementations, adaptive bit allocation may be used to reduce the informational requirements of the encoded signal.
摘要翻译：在编码器中，表示多维声场的多声道音频信息被分割为子带信号，并且将一个或多个子带中的子带信号组合以形成复合信号。复合信号，未组合成复合信号的子带信号和描述组合成复合信号的子带信号的频谱电平的信息被组合成编码的输出信号。频谱电平信息传达组合子带信号的幅度或功率或由组合子带信号表示的声场的视在方向。在数字实现中，可以使用自适应比特分配来减少编码信号的信息要求。

8. 发明授权

US5890125A Method and apparatus for encoding and decoding multiple audio channels at low bit rates using adaptive selection of encoding method 失效
标题翻译：使用编码方法的自适应选择以低比特率对多个音频信道进行编码和解码的方法和装置
公开(公告)号：US5890125A
公开(公告)日：1999-03-30
申请号：US895496
申请日：1997-07-16
申请人： Mark Franklin Davis , Matthew Conrad Fellers
发明人： Mark Franklin Davis , Matthew Conrad Fellers
IPC分类号： H04N7/26 , G10L19/00 , G10L19/02 , H03M7/30 , H04B1/66 , H04H20/88 , H04R5/04 , H04S3/00 , G01L5/00
CPC分类号： H04H20/88 , G10L19/008 , G10L19/0208 , H04B1/665 , H04R5/04 , H04S2420/03
摘要： A split-band coding system combines multiple channels of input signals into various forms of composite signals and generates spatial-characteristic signals representing soundfield spatial characteristics in a plurality of frequency subbands. The spatial-characteristics signals may be generated in either or both of two forms. In a first form, the signal represents measures of signal levels for subband signals from the input channels. In a second form, the signal represents one or more apparent directions for the soundfield. The type of the spatial-characteristics signal may be adapted dynamically in response to a variety of criteria including input signal characteristics. Temporal smoothing and spectral smoothing of the spatial-characteristics signals may be applied in an encoder. Temporal smoothing and spectral smoothing may be applied to gain factors derived from the spatial-characteristics signals in a decoder.
摘要翻译：分离带编码系统将多路输入信号组合成各种形式的复合信号，并产生表示多个频率子带中声场空间特性的空间特征信号。空间特征信号可以以两种形式中的一种或两种形式产生。在第一形式中，信号表示来自输入通道的子带信号的信号电平的测量。在第二种形式中，信号表示声场的一个或多个表观方向。响应于包括输入信号特性的各种标准，空间特性信号的类型可以动态地适配。空间特征信号的时间平滑和频谱平滑可以应用于编码器中。时间平滑和频谱平滑可以应用于从解码器中的空间特征信号导出的增益因子。

9. 发明授权

US08170882B2 Multichannel audio coding 有权
标题翻译：多声道音频编码
公开(公告)号：US08170882B2
公开(公告)日：2012-05-01
申请号：US11888657
申请日：2007-07-31
申请人： Mark Franklin Davis
发明人： Mark Franklin Davis
IPC分类号： G10L19/00
CPC分类号： G10L19/06 , G10L19/005 , G10L19/008 , G10L19/018 , G10L19/02 , G10L19/0204 , G10L19/025 , G10L19/26 , H04S3/00 , H04S3/008
摘要： Multiple channels of audio are combined either to a monophonic composite signal or to multiple channels of audio along with related auxiliary information from which multiple channels of audio are reconstructed, including improved downmixing of multiple audio channels to a monophonic audio signal or to multiple audio channels and improved decorrelation of multiple audio channels derived from a monophonic audio channel or from multiple audio channels. Aspects of the disclosed invention are usable in audio encoders, decoders, encode/decode systems, downmixers, upmixers, and decorrelators.
摘要翻译：音频的多个通道被组合到单声道复合信号或多个音频通道以及重构多个声道的相关辅助信息，包括将多个音频通道改进到单声道音频信号或多个音频通道的下混合，以及改进了从单声道音频通道或多个音频通道导出的多个音频通道的去相关。所公开的发明的方面可用于音频编码器，解码器，编码/解码系统，降混器，上混合器和去相关器。

10. 发明授权

US07660424B2 Audio channel spatial translation 有权
标题翻译：音频通道空间翻译
公开(公告)号：US07660424B2
公开(公告)日：2010-02-09
申请号：US10522515
申请日：2003-08-06
申请人： Mark Franklin Davis
发明人： Mark Franklin Davis
IPC分类号： H04R5/00
CPC分类号： H04S5/005 , H04S3/02
摘要： Using an M:N variable matrix, M audio input signals, each associated with a direction, are translated to N audio output signals, each associated with a direction, wherein N is larger than M, M is two or more and N is a positive integer equal to three or more. The variable matrix is controlled in response to measures of: (1) the relative levels of the input signals, and (2) the cross-correlation of the input signals so that a soundfield generated by the output signals has a compact sound image in the nominal ongoing primary direction of the input signals when the input signals are highly correlated, the image spreading from compact to broad as the correlation decreases and progressively splitting into multiple compact sound images, each in a direction associated with an input signal, as the correlation continues to decrease to highly uncorrelated.
摘要翻译：使用M：N可变矩阵，每个与方向相关联的M个音频输入信号被转换为N个音频输出信号，每个音频输出信号与方向相关联，其中N大于M，M为两个或更多，N为正整数等于三个或更多。响应于以下措施来控制可变矩阵：（1）输入信号的相对电平，和（2）输入信号的互相关，使得由输出信号产生的声场具有紧凑的声像当输入信号高度相关时，输入信号的标称正在进行的主要方向，随着相关性的降低，图像从紧凑扩展到广泛，并且随着相关性的继续逐渐分解成与输入信号相关联的方向的多个紧凑声像减少到高度不相关。

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