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21.发明公开Decoding device for multichannel audio bitstream 有权Vorrichtung zur Dekodierung eines Mehrkanalaudiobitstroms
公开(公告)号：EP0948141A2
公开(公告)日：1999-10-06
申请号：EP99106068.2
申请日：1999-03-26
发明人： Sueyoshi, Masahiro , Matsumoto, Masaharu , Miyasaka, Shuji , Fujita, Takeshi , Katayama, Takashi , Abe, Kazutaka , Nishio, Kosuke , Kawamura, Akihisa , Ishito, Tsukuru , Nakamura, Tsuyoshi , Otomura, Eiji
CPC分类号： H04N21/4341 , H04N21/8106
摘要： A decoding device for decoding a bit stream defined by MPEG2 Audio Multichannel is provided. The bit stream including an MPEG1 compatible area and an MPEG2 multichannel extended area, the MPEG1 compatible area including MPEG1 side information. The decoding device includes: MPEG1 decoding means for decoding the MPEG1 compatible area; MC decoding means for decoding the MPEG2 multichannel extended area; and MC header detection means for executing a first processing including locating a position of a header of the MPEG2 multichannel extended area based on the MPEG1 side information and shifting a read position of the bit stream to the position of the header.
摘要翻译： 提供了解码由MPEG2音频多通道定义的比特流的解码装置。 包括MPEG1兼容区域和MPEG2多通道扩展区域的比特流，MPEG1兼容区域包括MPEG1侧信息。 解码装置包括：用于解码MPEG1兼容区域的MPEG1解码装置; 用于解码MPEG2多声道扩展区域的MC解码装置; 以及MC头部检测装置，用于执行包括基于MPEG1侧信息定位MPEG2多通道扩展区域的头部的位置并将比特流的读取位置移位到头部位置的第一处理。
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公开(公告)号：EP0935203A2
公开(公告)日：1999-08-11
申请号：EP99101618.9
申请日：1999-02-03
发明人： Miyasaka, Shuji , Fujita, Takeshi , Sueyoshi, Masahiro , Kawamura, Akihisa , Matsumoto, Masaharu , Katayama, Takashi , Kazutaka, Abe , Nishio, Kosuke
IPC分类号： G06F17/10
CPC分类号： G06F7/552 , G10L19/0212
摘要： A device of the present invention is an exponential calculation device for calculating x^(a/b) (where a and b are each an integer constant) for a given input value of x. The device includes: an input control section for outputting a value of x', wherein x'=x when x≤A (where A is a threshold value within a variable range of x) and x'=x/2^b when x>A; a core section for outputting a value of z'=x'^(a/b) ; and an output control section for outputting a value of z, wherein z=z' when x≤A and z=z'*2^a when x>A.
摘要翻译： 本发明的装置是用于对于给定的x的输入值计算x＆amp;（a / b）（其中a和b各自是整数常数）的指数计算装置。 该装置包括：用于输出x'值的输入控制部分，其中当x≤A（其中A是x的可变范围内的阈值）时x'= x，x'= x / 2＆amp; circ＆b当x > A; 用于输出z'= x'和circ＆（a / b）的值的核心部分; 以及用于输出z的值的输出控制部分，其中当x≤A且z = z'* 2时z = z'，当x> A时z = z'。
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23.发明公开Compressed code decoding device and audio decoding device 失效Dekoderfürkomprimierte Signale und DekoderfürAudiosignale
公开(公告)号：EP0880246A2
公开(公告)日：1998-11-25
申请号：EP98108809.9
申请日：1998-05-14
发明人： Matsumoto, Masaharu , Katayama, Takashi , Sueyoshi, Masahiro , Miyasaka, Shuji , Fujita, Takeshi , Kawamura, Akihisa , Ishito, Tsukuru , Otomura, Eiji , Nakamura, Tsuyoshi
IPC分类号： H04H1/00
CPC分类号： G10L21/055 , G10L19/00
摘要： A compressed code decoding device of the present invention includes: a decoding section for receiving a plurality of groups of blocks of compressed codes and decoding each of the blocks of compressed codes; a buffer section for storing decoded signals decoded by the decoding section; a reproduction time acquisition section for acquiring a reproduction time at which to reproduce a predetermined one of the blocks; an output section for externally outputting the decoded signals stored in the buffer section; a detection section for detecting that the predetermined block of compressed codes has been decoded and output via the output section; an addition section for, at a time when the detection section detects that the predetermined block has been output, adding a time required for reproducing the predetermined block to the reproduction time acquired by the reproduction time acquisition section so as to produce a synchronization time; a synchronization section for comparing the synchronization time produced by the addition section and a current time so as to determine whether the synchronization time is ahead of or behind the current time; a code discarding section for, if the synchronization section determines that the synchronization time is ahead of the current time, discarding either compressed codes of one of the blocks next to the predetermined block or compressed codes of one of the groups next to the group including the predetermined block; and a reproduction delay section for, if the synchronization section determines that the synchronization time is behind the current time, delaying output of either decoded signals of the compressed codes of one of the blocks next to the predetermined block or decoded signals of the compressed codes of one of the groups next to the group including the predetermined block.
摘要翻译： 本发明的压缩码解码装置包括：解码部分，用于接收多组压缩码块，并对每个压缩码块进行解码; 缓冲部，用于存储由解码部解码的解码信号; 再现时间获取部分，用于获取再现预定的一个块的再现时间; 输出部分，用于从外部输出存储在缓冲部分中的解码信号; 检测部分，用于检测所述预定的压缩码块是否经由所述输出部分被解码和输出; 一个加法部分，用于当检测部分检测到预定块已被输出时，将再现预定块所需的时间加到由再现时间获取部分获得的再现时间中，以产生同步时间; 同步部分，用于比较由加法部分产生的同步时间和当前时间，以便确定同步时间是否在当前时间之前或之后; 代码丢弃部分，用于如果同步部分确定同步时间在当前时间之前，则丢弃与预定块相邻的块中的一个块的压缩代码或者包括 预定块 以及再现延迟部分，如果同步部分确定同步时间在当前时间之后，则将预定块旁边的块之一的压缩码的解码信号的输出或压缩码的解码信号延迟 包括预定块在组旁边的组之一。
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24.发明公开Sound field and sound image control apparatus and method 失效Verfahren und Vorrichtung zur Schallfeld- und Tonbildsteuerung。
公开(公告)号：EP0684751A1
公开(公告)日：1995-11-29
申请号：EP94108134.1
申请日：1994-05-26
发明人： Serikawa, Mitsuhiko , Tagami, Ryou , Kawamura, Akihisa , Matsumoto, Masaharu , Oda, Mikio , Numazu, Hiroko
IPC分类号： H04S1/00
CPC分类号： H04S1/002
摘要： The apparatus of the invention calculates filter coefficients for controlling sound field and sound image, based on a plurality of first impulse response signals and a pair of second impulse response signals. The plurality of first impulse response signals indicate impulse responses from loudspeakers reproducing audio signals to both ears of a listener. The pair of second impulse response signals indicate impulse responses from a reference loudspeaker at a position at which a sound image is localized to both ears of the listener. The apparatus includes: a feature extracting section for receiving the pair of second impulse response signals, for extracting parameters representing features of the pair of second impulse response signals, and for outputting parameter signals; a signal adjusting section for adjusting at least one of the plurality of first impulse response signals based on the parameter signals, and for outputting a pair of third impulse response signals having the same features as the extracted features; and a coefficient calculating section for calculating the filter coefficients for controlling the sound field and sound image, based on the plurality of first impulse response signals and the pair of third impulse response signals applied from the signal adjusting means.
摘要翻译： 本发明的装置基于多个第一脉冲响应信号和一对第二脉冲响应信号来计算用于控制声场和声像的滤波器系数。 多个第一脉冲响应信号指示从再现音频信号的扬声器到听众的双耳的脉冲响应。 一对第二脉冲响应信号指示在声音图像被定位在收听者的两只耳朵的位置处的参考扬声器的脉冲响应。 该装置包括：特征提取部分，用于接收一对第二脉冲响应信号，用于提取表示该对第二脉冲响应信号的特征的参数，并用于输出参数信号; 信号调整部分，用于基于参数信号调整多个第一脉冲响应信号中的至少一个，并输出具有与提取的特征相同特征的一对第三脉冲响应信号; 以及系数计算部分，用于基于从信号调节装置施加的多个第一脉冲响应信号和一对第三脉冲响应信号，来计算用于控制声场和声像的滤波器系数。
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公开(公告)号：EP0599450A2
公开(公告)日：1994-06-01
申请号：EP93306966.8
申请日：1993-09-02
IPC分类号： H04R3/02
CPC分类号： H04R3/02
摘要： A sound signal picked-up by a microphone is processed in a howl suppresser including a digital filter. A frequency analyzer performs frequency analysis of the picked-up sound signal. A howl detector detects a howl contained in the sound signal from a result of frequency analysis by the frequency analyzer. An operation parts calculates coefficients to be set to the digital filter to suppress the howl according to a detection result by the howl detector, and a control part sets the calculated coefficients to the digital filter. The howl detector judges that a maximum peak power level among power levels of the sound signal in a frequency region analyzed by the frequency analyzer is a howl component when a ratio of the maximum peak power level to a mean power level of the sound signal is larger than a predetermined threshold level, preferably for a predetermined threshold time. Also, a threshold control means is provided for controlling the threshold level and/or the threshold time so as to enhance accuracy of howl detection.
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26.发明公开
公开(公告)号：EP0544647A2
公开(公告)日：1993-06-02
申请号：EP93102770.0
申请日：1988-01-15
CPC分类号： H03H17/06 , H03H17/0211
摘要： An apparatus for calculating a filter factor for a digital filter which can be made with a simple construction and in which the time period for calculation can be shortened as compared with conventional techniques. The apparatus comprises inputting means including amplitude inputting means for inputting a desirable amplitude frequency property and phase inputting means for inputting a desirable phase frequency property;
reverse-Fourier transformation means for obtaining an impulse response corresponding to a transfer function having the inputted amplitude frequency property and the inputted phase and frequency property; and
setting means for setting to said external filter the impulse response obtained by the reserve-Fourier transformation, as a filter factor.摘要翻译： 一种用于计算用于简单结构的数字滤波器的滤波器系数的装置，并且与现有技术相比可以缩短计算时间段。 该装置包括：输入装置，包括用于输入期望的幅度频率特性的振幅输入装置和输入期望的相位频率特性的相位输入装置; 逆傅里叶变换装置，用于获得对应于具有所输入的幅度频率特性和输入的相位和频率特性的传递函数的脉冲响应; 以及设定装置，用于将所述外部滤波器设置为通过所述保留 - 傅里叶变换获得的脉冲响应作为滤波器因子。
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27.发明公开Apparatus for supplying control codes to sound field reproduction apparatus 失效GerätzumÜbermittelnvon Steuercodes zu einemSchallfeldwiedergabegerät。
公开(公告)号：EP0356995A2
公开(公告)日：1990-03-07
申请号：EP89115926.1
申请日：1989-08-29
发明人： Kawamura, Akihisa , Matsumoto, Masaharu , Serikawa, Mitsuhiko , Tagami, Ryo , Sato, Katsuaki , Yoshida, Hiroko , Hashimoto, Hikari
IPC分类号： G11B27/32 , G11B27/10 , G11B27/34 , G11B27/00 , G11B33/10 , G11B31/00 , H04N5/76 , G11B20/00 , H04N5/91 , H04S1/00
CPC分类号： G11B20/00992 , G11B27/007 , G11B27/107 , G11B27/322 , G11B27/34 , H04N9/802 , H04S1/007
摘要： Control codes for controlling processing of an audio signal by a sound field variation circuit to produce desired sound fields are recorded on a monaural track of a video tape concurrent with recording of video and audio signals, and can thereby be subsequently played back for producing sound fields which are respectively synchronized with video images.
摘要翻译： 用于控制由声场变化电路处理音频信号以产生期望声场的控制代码与视频和音频信号的记录同时记录在录像带的单声道轨道上，从而可随后重放以产生声场 它们分别与视频图像同步。
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公开(公告)号：EP0666556B1
公开(公告)日：2005-02-02
申请号：EP95101466.1
申请日：1995-02-03
发明人： Ogawa, Michiko , Kawamura, Akihisa , Matsumoto, Masaharu , Date, Toshihiko , Tamura, Tadashi , Nakama, Yasutoshi
CPC分类号： G10K15/02
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公开(公告)号：EP1041721A3
公开(公告)日：2004-03-24
申请号：EP00106553.1
申请日：2000-03-27
发明人： Miyasaka, Shuji , Fujita, Takeshi , Sueyoshi, Masahiro , Kawamura, Akihisa , Matsumoto, Masaharu , Katayama, Takashi , Abe, Kazutaka , Nishio, Kousuke
IPC分类号： H03M7/42
CPC分类号： H03M7/425
摘要： A decoding device for decoding a data stream includes a decoding table including a first region and a second region; a first decoder; and a second decoder. The first region defines a relationship between first data having a predetermined number of bits and a result of decoding a portion of the first data having bits smaller than or equal to the predetermined number. The second region defines a relationship between concatenated data obtained by concatenating the first data with second data having additional bits and a result of decoding the concatenated data. The first decoder reads the first data from the data stream; decodes the portion of the first data based on the first region; determines whether the decoding of the portion of the first data is completed or not; and when the decoding of the portion of the first data is completed, outputs a result of the decoding of the portion of the first data. When the decoding of the portion of the first data is not completed, the second decoder reads the second data out of the data stream: concatenates the first data with the second data to generate the concatenated data; decodes the concatenated data based on the second region; and outputs a result of the decoding of the concatenated data.
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公开(公告)号：EP1139336A3
公开(公告)日：2004-01-02
申请号：EP01107978.7
申请日：2001-03-29
发明人： Nishio, Kosuke , Katayama, Takashi , Matsumoto, Masaharu , Kawamura, Akihisa , Fujita, Takeshi , Sueyoshi, Masahiro , Abe, Kazutaka
IPC分类号： G10L19/02
CPC分类号： G10L19/0208
摘要： An encoder comprises an input device for sampling an input signal at predetermined time intervals to obtain sampled data on a temporal axis, a conversion device for converting the sampled data on the temporal axis to spectral data on a frequency axis, a quantization device for quantizing the spectral data on the frequency axis, and an output device for outputting a resultant value of quantization as an encoded bit stream. The quantization device comprises an expected-value-of-quantization adjustment portion for determining an expected value of quantization for a specific sub-band on the frequency axis, and a quantization portion for determining a quantization coefficient for the specific sub-band, and quantizing each of a plurality of spectral data contained in the specific sub-band using the quantization coefficient for the specific sub-band. The quantization coefficient for the specific sub-band is determined so that a resultant value of quantization obtained by quantizing one spectral data selected from the plurality of spectral data contained in the specific sub-band, using the quantization coefficient for the specific sub-band, is substantially equal to the expected value of quantization for the specific sub-band.
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