公开(公告)号：US08078475B2

公开(公告)日：2011-12-13

申请号：US11579740

申请日：2005-05-17

申请人： Mineo Tsushima

发明人： Mineo Tsushima

IPC分类号： G10L19/00 ,  H04R5/00

CPC分类号： H04S1/007 ,  G10L19/008

摘要： A portable player or a multi-channel home player includes: a mixed signal decoding unit that extracts, from a first inputted coded stream, a second coded stream representing a downmix signal into which multi-channel audio signals are mixed and supplementary information for reverting the downmix signal back to the multi-channel audio signals before being downmixed, and that decodes the second coded stream representing the downmix signal; a signal separation processing unit that separates the downmix signal obtained by decoding based on the extracted supplementary information and that generates audio signals which are acoustically approximate to the multi-channel audio signals before being downmixed; and headphones or speakers that reproduce the decoded downmix signal or speakers that reproduce the multi-channel audio signals separated from the downmix signal.

摘要翻译： 一种便携式播放器或多声道家庭播放器包括：混合信号解码单元，从第一输入编码流提取表示多声道音频信号混合到其中的下混合信号的第二编码流，以及用于恢复 在混合之前将下混合信号返回到多声道音频信号，并且对表示下混合信号的第二编码流进行解码; 信号分离处理单元，其根据所提取的补充信息分离通过解码获得的下混合信号，并在下混合之前产生声学上接近多声道音频信号的音频信号; 以及再现解码缩混信号或扬声器的耳机或扬声器，其再现与下混合信号分离的多声道音频信号。

公开(公告)号：US20080071549A1

公开(公告)日：2008-03-20

申请号：US11629135

申请日：2005-06-28

申请人： Kok Chong ,  Naoya Tanaka ,  Sua Neo ,  Mineo Tsushima

发明人： Kok Chong ,  Naoya Tanaka ,  Sua Neo ,  Mineo Tsushima

IPC分类号： G10L19/00

CPC分类号： G10L19/008 ,  G10L19/24

摘要： In the conventional art inventions for coding multi-channel audio signals, three of the major processes involved are: generation of a reverberation signal using an all-pass filter; segmentation of a signal in the time and frequency domains for the purpose of level adjustment; and mixing of a coded binaural signal with an original signal coded up to a fixed crossover frequency. These processes pose the problems mentioned in the present invention. The present invention proposes the following three embodiments: to control the extent of reverberations by dynamically adjusting all-pass filter coefficients with the inter-channel coherence cues; to segment a signal in the time domain finely in the lower frequency region and coarsely in the higher frequency region; and to control a crossover frequency used for mixing based on a bit rate, and if the original signal is coarsely quantized, to mix a downmix signal with an original signal in proportions determined by an inter-channel coherence cue.

摘要翻译： 在用于编码多声道音频信号的传统技术发明中，涉及的三个主要过程是：使用全通滤波器产生混响信号; 用于时间和频域的信号分段，以进行电平调整; 并将编码的双耳信号与编码为固定的交越频率的原始信号进行混合。 这些处理构成了本发明中提到的问题。 本发明提出以下三个实施例：通过使用信道间相干线索动态调整全通滤波器系数来控制混响的程度; 以在较低频率区域精细地分割时域中的信号，在较高频率区域中粗略地分割信号; 并且基于比特率来控制用于混合的交叉频率，并且如果原始信号被粗量化，则以通过信道内相干提示确定的比例将下混合信号与原始信号混合。

公开(公告)号：US20070160236A1

公开(公告)日：2007-07-12

申请号：US10589818

申请日：2005-07-01

申请人： Kazuhiro Iida ,  Mineo Tsushima ,  Yoshiaki Takagi ,  Naoya Tanaka

发明人： Kazuhiro Iida ,  Mineo Tsushima ,  Yoshiaki Takagi ,  Naoya Tanaka

IPC分类号： H04B1/00 ,  H04B1/20

CPC分类号： H04S3/00

摘要： An audio signal encoding device includes a downmix signal encoding unit 203 and an auxiliary information generation unit 204. The downmix signal encoding unit 203 generates a downmix signal acquired by adding input signals each other using a predetermined method, encodes the downmix signal, and outputs downmix signal information 206. The auxiliary information generation unit 204 generates auxiliary information 205 using the downmix signal and the downmix signal information 206 generated by the downmix signal encoding unit 203. The auxiliary information generation unit 204 efficiently quantizes the auxiliary information 205 using human's characteristics of a perceptual direction of a sound source, a perceptual broadening, and a perceptual distance.

摘要翻译： 音频信号编码装置包括下混信号编码单元203和辅助信息生成单元204。 下混信号编码单元203通过使用预定方法相加输入信号而产生下混信号，对下混信号进行编码，并输出下混合信号信息206。 辅助信息生成单元204使用由混合信号编码单元203生成的下混信号和下混信号信息206来生成辅助信息205。 辅助信息生成单元204使用人的声源的感知方向，感知加宽度和感知距离的特性来有效地量化辅助信息205。