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1.发明授权Method and apparatus for encoding and decoding audio information representing three-dimensional sound fields 失效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
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。
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2.发明授权Two-stage compression and expansion of coupling processed multi-channel sound signals for transmission and recording 失效双级压缩和扩展耦合处理的多声道声音信号进行传输和记录
公开(公告)号：US5873065A
公开(公告)日：1999-02-16
申请号：US446689
申请日：1995-11-20
IPC分类号： G11B20/10 , G10L19/00 , G10L19/008 , G10L19/02 , G11B20/00 , H03M7/30 , H03M7/40 , H04B1/66 , H04B14/04 , H04H5/00 , H04H20/88 , H04S1/00 , H04S3/00
CPC分类号： H04H20/88 , G11B20/00007 , H04B1/665 , H04S1/007 , H04S3/00 , G11B2020/10592 , G11B2020/10601
摘要： A multi-channel signal compressor for compressing digital sound signals in the respective channels of a multi-channel sound system. The apparatus comprises a first-stage compression system and a second-stage compression system. In the first-stage compression system, a coupling circuit performs coupling between the digital sound signals of at least two of the channels to generate coupling-processed signals, one for each of the channels. A compressor circuit receives the coupling-processed signals from the coupling circuit and frequency divides each coupling-processed signal into frequency range signals in respective frequency ranges, and compresses the frequency range signals obtained by dividing each coupling-processed signal to generate a first-stage compressed signal. In the second-stage compression system, a determining circuit receives the first-stage compressed signal for each channel from the first-stage compression system and determines an energy for each channel from the first-stage compressed signal of the respective channel. A channel bit apportionment decision circuit operates in response to the determining circuit, and apportions a predetermined number of bits among the channels to apportion a number of bits to each channel. Finally, an additional compressor additionally compresses the first-stage compressed signal of each channel using, for each channel, the number of bits apportioned to the respective channel by the channel bit apportionment decision circuit.
摘要翻译： PCT No.PCT / US94 / 14267 Sec。 371日期：1995年11月20日 102（e）1995年11月20日日期PCT 1994年12月7日提交的用于在多声道声音系统的各个声道中压缩数字声音信号的多声道信号压缩器。 该装置包括第一级压缩系统和第二级压缩系统。 在第一级压缩系统中，耦合电路在至少两个通道的数字声音信号之间执行耦合，以产生耦合处理的信号，每个通道一个信号。 压缩机电路从耦合电路接收经耦合处理的信号，并且将每个经耦合处理的信号频率分成各个频率范围内的频率范围信号，并且压缩通过划分每个耦合处理的信号而获得的频率范围信号，以产生第一级 压缩信号。 在第二级压缩系统中，确定电路从第一级压缩系统接收每个通道的第一级压缩信号，并从相应通道的第一级压缩信号确定每个通道的能量。 通道位分配判定电路响应于确定电路而工作，并且在通道中分配预定数量的位以将每个通道的位数分配。 最后，额外的压缩器另外使用信道比特分配决定电路对每个信道压缩每个信道的第一级压缩信号，以分配给相应信道的比特数。
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公开(公告)号：US5632005A
公开(公告)日：1997-05-20
申请号：US487725
申请日：1995-06-07
申请人： Mark F. Davis , Craig C. Todd , Ray Milton Dolby
发明人： Mark F. Davis , Craig C. Todd , Ray Milton Dolby
CPC分类号： G10L19/008 , H04S3/008
摘要： An adaptive high-fidelity perceptual subband encoder for spatially directional multichannel audio signals, using a mixture of individual-channel subband coding with subband-steered composite-channel signal coding that combines the spectral components of the individual channel subbands selected for steering. The composite channel representation includes a subband steering control signal which either conveys the levels of the spectral components from all the steered channels, or represents the apparent directions (net directional vectors) of the spectral components from all the steered channels.
摘要翻译： 一种用于空间定向多声道音频信号的自适应高保真感知子带编码器，其使用组合选择用于转向的各个信道子带的频谱分量的子频带子带编码与子带转向复合信道信号编码的混合。 复合信道表示包括从所有转向信道传送频谱分量的级别或表示来自所有转向信道的频谱分量的表观方向（净方向向量）的子带导向控制信号。
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公开(公告)号：US3972010A
公开(公告)日：1976-07-27
申请号：US537574
申请日：1974-12-20
申请人： Ray Milton Dolby
发明人： Ray Milton Dolby
摘要： A signal processing system for providing compressor and expander operation which system includes a main, or straight through, signal path and a further signal path in parallel therewith. The further path derives its input from the input to the main path or from some later point in the signal path. The output of the further signal path is combined additively with that of the main path for compressor operation and subtractively for expander operation, such further signal path output being appropriately limited so that it can only make a noticeable contribution to the resultant signal level at low input signal levels. True complementarity is attainable by the use of a compressor and expander together to provide an overall noise reduction action without introducing defects into the signal being processed.
摘要翻译： 一种用于提供压缩机和扩展器操作的信号处理系统，该系统包括与其平行的主或直通信号路径和另外的信号路径。 另外的路径从输入到主路径或从信号路径中的某个稍后的位置导出其输入。 另外的信号路径的输出与用于压缩器操作的主路径的输出相加地组合，并且对于扩展器操作是相减的，这样的另外的信号路径输出被适当地限制，使得它只能在低输入处对所得到的信号电平作出显着的贡献 信号电平。 通过一起使用压缩机和膨胀器来实现真正的互补性，以提供整体降噪作用，而不会将缺陷引入待处理的信号中。
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公开(公告)号：US4024344A
公开(公告)日：1977-05-17
申请号：US631319
申请日：1975-11-12
CPC分类号： H04S5/00 , H04S2400/05
摘要： In a stereophonic reproduction system, especially for a cinema, a center channel signal is derived by combining left and right channel signals. In order to harden the center image, particularly in speech, the left and right channel signals are compared and, when they include significant amounts of correlated information, the relative gain of the center channel is enhanced by boosting the gain of that channel and/or cutting the gain of the left and right channels. The test for correlation of information is preferably restricted to speech frequencies and the enhancement of relative gain may be performed only at middle frequencies.
摘要翻译： 在立体声再现系统中，特别是对于电影院，通过组合左和右声道信号导出中心声道信号。 为了硬化中心图像，特别是在语音中，比较左和右声道信号，并且当它们包括大量的相关信息时，通过增加该通道的增益和/或增强中心声道的相对增益来增强中心声道的相对增益 减少左右通道的增益。 信息相关性的测试优选地限于语音频率，并且相对增益的增强可以仅在中频进行。
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公开(公告)号：US3978409A
公开(公告)日：1976-08-31
申请号：US477205
申请日：1974-06-07
摘要： The invention concerns a dynamic range compressor type encoder or expander type decoder, in which a main signal component in a main path is boosted or bucked by a further signal component derived from a point in the main path by a further path having the characteristics of so restricting the further signal component that the boosting or bucking action is only appreciable below a low level threshold. In the present invention the further signal component is a difference signal formed between a direct signal derived from a point in the main path and a delayed version of either the same signal or of another signal derived from another point in the main path. At the frequency equal to the reciprocal of the delay, and at harmonics of this frequency, the direct and delayed signals cancel. The compressor or expander action, and hence noise reduction action, takes place only at intervening frequencies. The invention enables carrier components or other repetitive components of signals to be excluded from the compressor or expander action (which they would otherwise choke).
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公开(公告)号：US3967219A
公开(公告)日：1976-06-29
申请号：US509076
申请日：1974-09-25
申请人： Ray Milton Dolby
发明人： Ray Milton Dolby
摘要： A compressor or expander circuit is constructed by connecting a plurality of impedance networks in series across input terminals, at least one network being frequency selective. Output terminals are connected across one or more of the networks. The frequency selective network varies its parameters in response to the level of components within a restricted frequency band determined by this network so as to narrow the band when the level of such components increases. This includes such components from the restricted band and thereby from the compression or expansion action.
摘要翻译： 压缩机或扩展器电路通过串联连接跨输入端子的多个阻抗网络构成，至少一个网络是频率选择的。 输出端子连接在一个或多个网络上。 频率选择网络响应于由该网络确定的受限频带内的组件的电平而改变其参数，以便当这些组件的级别增加时，使频带变窄。 这包括来自限制带的这些组件，从而由压缩或膨胀动作。
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公开(公告)号：US3934190A
公开(公告)日：1976-01-20
申请号：US519631
申请日：1974-10-31
申请人： Ray Milton Dolby
发明人： Ray Milton Dolby
摘要： Compressors and expanders for effecting dynamic range modification are constructed by connecting reactive networks in series for voltage dividing action or in parallel for current dividing action. The output signal is derived from the voltage across or current through one of the networks which includes a series or parallel variable resistance. The variable resistance is controlled in dependence upon the voltage thereacross in the sense required to achieve compression or expansion, as the case may be. The resistance change shifts a turnover frequency of the circuit so as to exclude large amplitude components from the amplitude increase or reduction which is applied to low level components within a restricted frequency band to create the compressor or expander action.
摘要翻译： 用于实现动态范围修改的压缩机和扩展器通过连接用于分压动作的串联的无功电网或并联用于当前分流动作来构建。 输出信号源自包含串联或并联可变电阻的网络之一或电流的电压。 根据情况可以根据实现压缩或膨胀所需的意义上的电压来控制可变电阻。 电阻变化使电路的周转频率偏移，以便从施加到受限频带内的低电平分量的幅度增大或减小中排除大幅度分量，以产生压缩机或扩展器动作。
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