公开(公告)号：WO1998023130A1

公开(公告)日：1998-05-28

申请号：PCT/EP1997005446

申请日：1997-10-02

Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. ,  SEITZER, Dieter ,  SPORER, Thomas

Inventor： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

IPC: H04S01/00

CPC classification number: H04S1/007 ,  G10L25/69

Abstract: In a method for assessing the quality of an audio test signal (14), which has been derived by coding and decoding an audio reference signal (12), the audio test signal (14) is compared with the audio reference signal (12), as it were, behind the cochlea of the human ear. All masking effects and the transmission functions of the ear are equally applied to the audio reference signal (12) and to the audio test signal (14). To this end, the audio test signal (14) is broken down according to its spectral components by means of a first bank of filters (20) consisting of filters overlapping in frequency and defining spectral regions, said filters having differing filtering functions, which have been determined on the basis of the excitation curve of the human ear with respect to the respective filtered middle frequency. The audio reference signal (12) is also broken down according to its spectral composition into partial audio reference signals by means of a second bank of filters (16) coinciding with the first bank of filters (2). Subsequently, a level difference by spectral region is formed between the audio test signals (22) belonging to the same spectral regions and the audio reference signals (18). To assess the quality of the audio test signal (14), a detection probability is determined on the basis of each level difference so as to pick up any decoding error of the test signal (14) in the spectral region concerned.

Abstract translation: 在用于音频测试信号（14），其由编码衍生的质量评估的方法和音频参考信号（12），所述音频测试信号（14）的与所述音频参考信号（12）在一定程度上代替了人耳的耳蜗后面的比较进行解码。 所有掩蔽效应和耳的传递函数被相等地施加到音频参考信号（12）和音频测试信号（14）。 为此，音频测试信号（14）位于频率重叠的术语根据其光谱组成由彼此光谱区域限定具有不同滤波函数分解滤波器，每个固定在各自的滤波器的中心频率的第一滤波器组（20）的装置由于人耳的激发曲线。 音频参考信号（12），根据由与所述第一滤波器组（20）中的第二滤波器组（16）进入部分音频参考信号（18）的匹配的装置其光谱成分也被分解。 接着，属于同一局部音频测试信号（22）和部分音频参考信号（18）的光谱部分之间的高度差形成spektralabschnittsweise。 用于评估的音频测试信号（14）的质量，用于检测在相应的频谱部分中的音频测试信号（14）的编码误差的检测概率的各电平差spektralabschnittsweise的基础上确定的。

公开(公告)号：WO1997037514A1

公开(公告)日：1997-10-09

申请号：PCT/GB1997000772

申请日：1997-03-20

Applicant: CENTRAL RESEARCH LABORATORIES LIMITED ,  CLEMOW, Richard ,  NACKVI, Fawad

Inventor： CENTRAL RESEARCH LABORATORIES LIMITED

IPC: H04S01/00

CPC classification number: H04S1/002

Abstract: In order to simplify filter construction in a circuit which can be used for crosstalk cancellation in binaural signals to be played through loudspeakers, the circuit includes first and second signal paths for receiving as inputs, left and right binaural signals LEFT-IN, RIGHT-IN. The first signal path (14) includes a first summing junction (10) and the second signal path includes a second summing junction (12). The output of summing junction (10) is coupled by a first cross-path (14) to an input of summing junction (12), and the output of summing junction (12) is coupled by a second cross-path (22) to an input of junction (10). The first and second cross-paths include respective first and second filter means (17, 25) which include crosstalk filters (18, 26) each having a transfer function A/S, where A and S represent far-ear and near-ear HRTFs. The outputs of the summing junctions (10, 12) represent output signals LEFT-OUT, RIGHT-OUT, incorporating crosstalk cancellation.

Abstract translation: 为了简化可用于通过扬声器播放的双耳信号中的串扰消除的电路中的滤波器构造，该电路包括用于接收作为输入的第一和第二信号路径，左和右双耳信号LEFT-IN，RIGHT-IN 。 第一信号路径（14）包括第一求和结（10），第二信号路径包括第二加法结（12）。 求和结（10）的输出通过第一交叉路径（14）耦合到求和结（12）的输入，并且求和结（12）的输出通过第二交叉路径（22）耦合到 结（10）的输入。 第一和第二交叉路径包括相应的第一和第二滤波器装置（17,25），其包括每个具有传递函数A / S的串扰滤波器（18,26），其中A和S表示远耳和近耳HRTF 。 求和点（10,12）的输出表示输入信号LEFT-OUT，RIGHT-OUT，并入串扰消除。

公开(公告)号：WO1996006515A1

公开(公告)日：1996-02-29

申请号：PCT/GB1995002005

申请日：1995-08-24

Applicant: ADAPTIVE AUDIO LIMITED ,  ORDUÑA-BUSTAMANTE, Felipe ,  KIRKEBY, Ole ,  HAMADA, Hareo ,  NELSON, Philip, Arthur

Inventor： ADAPTIVE AUDIO LIMITED

IPC: H04S01/00

CPC classification number: H04S1/002 ,  H04S1/005 ,  H04S1/007 ,  H04S3/002 ,  H04S2420/01

Abstract: A method of recording sound for reproduction by a plurality of loudspeakers, or for processing sound for reproduction by a plurality of loudspeakers, is described in which some of the reproduced sound appears to a listener to emmanate from a virtual source which is spaced from the loudspeakers. A filter means (H) is used either in creating the recording, or in processing the recorded signals for supply to loudspeakers, the filter means (H) being created in a filter design step in which: a) a technique is employed to minimise error between the signals (w) reproduced at the intended position of a listener on playing the recording through the loudspeakers, and desired signals (d) at the intended position, wherein: b) said desired signals (d) to be produced at the listener are defined by signals (or an estimate of the signals) that would be produced at the ears of (or in the region of) the listener in said intended position by a source at the desired position of the virtual source. A least squares technique may be employed to minimise the time averaged error between the signal reproduced at the intended position of a listener and the desired signal, or it may be applied to the frequency domain.

Abstract translation: 描述了一种通过多个扬声器记录用于再现的声音或用于处理由多个扬声器进行再现的声音的方法，其中一些再现的声音出现在听众身上，从与扬声器间隔开的虚拟源显现 。 滤波器装置（H）用于创建记录，或者在处理记录的信号供给扬声器时，在滤波器设计步骤中产生滤波器装置（H），其中：a）使用技术来最小化误差 在通过扬声器播放记录时在收听者的预期位置处再现的信号（w）和期望的信号（d）之间，其中：b）在收听者处产生的所需期望信号（d） 由在虚拟源的期望位置处的源在所述预期位置处的（或在该区域中）产生的信号（或信号的估计）定义。 可以采用最小二乘法来最小化在收听者的预期位置再现的信号与期望信号之间的时间平均误差，或者将其应用于频域。

公开(公告)号：WO1995017799A1

公开(公告)日：1995-06-29

申请号：PCT/GB1994002756

申请日：1994-12-16

Applicant: CENTRAL RESEARCH LABORATORIES LIMITED ,  PHILP, Adam, Rupert ,  SIBBALD, Alastair ,  CLEMOW, Richard, David ,  NACKVI, Fawad

Inventor： CENTRAL RESEARCH LABORATORIES LIMITED

IPC: H04S01/00

CPC classification number: H04S1/007 ,  H04S1/002

Abstract: Audio signal adjustment apparatus including left and right signal channels (4, 6) for connection to respective left and right sound transducers (18, 20), means (8-30) within each channel for adjusting signal parameters for varying the stereophonic effect produced by the transducers, such adjusting means including azimuthal adjustment means (24-30) for adjusting the stereophonic effect in dependence on the azimuthal orientation ( theta ) of the facing direction (D) of a listener's head (16) in relation to an imaginary plane (22) containing the listener's head and the sound transducers, the azimuthal adjustment means including a filter means (28, 30) with a transfer function adjustable in dependence on a set of stored items of information relating to binaural head-related transfer functions representing predetermined angles of said azimuthal orientation, and user operable means (14, 15) for selecting a desired item for modification of the filter transfer function.

Abstract translation: 音频信号调节装置，包括用于连接到相应的左和右声音换能器（18,20）的左和右信号通道（4,6），每个通道内的装置（8-30）用于调节用于改变立体声效应的信号参数，以改变由 换能器，这种调节装置包括方位调节装置（24-30），用于根据听者头部（16）相对于假想平面（16）的面向方向（D）的方位角取向（theta）调节立体声效应 22），其包含收听者的头部和声音传感器，方位调整装置包括具有可根据一组存储的信息项调节的传递函数的滤波器装置（28,30），该组信息与表示预定角度的双耳头相关的传递函数有关 以及用户可操作装置（14,15），用于选择用于修改过滤器传递功能的期望项目。

公开(公告)号：WO1993025054A1

公开(公告)日：1993-12-09

申请号：PCT/US1993005169

申请日：1993-06-01

Applicant: FUSAN LABORATORIES, INC.

Inventor： FUSAN LABORATORIES, INC. ,  FIELDS, Craig, D. ,  BROOKS, John, M.

IPC: H04S01/00

CPC classification number: H04S1/007

Abstract: A method and apparatus for processing digital stereo signals in a stereo system having a left (L) and right (R) channel in which digital information corresponding to the left (L) and right (R) channels is read from a source of digital information. The left (L) and right (R) channels of information are duplicated and various duplicated signals are processed by predetermined functions. The duplicated signals are manipulated by a plurality of user-defined functions (108, 124) to form a space signal, which is combined (126, 132) with other signals to form left and right output signals.

公开(公告)号：WO1993009644A1

公开(公告)日：1993-05-13

申请号：PCT/DE1992000869

申请日：1992-10-13

Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ... ,  HERRE, Jürgen ,  SEITZER, Dieter

Inventor： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ...

IPC: H04S01/00

CPC classification number: H04H20/88 ,  H04S1/007

Abstract: The description relates to a process for reducing data in the transmission and/or storage of digital signals from several dependent channels. The dependence of the signals in a channel, e.g. in a left and right-hand stereo channel, can be used for further data reduction. Prior art processes like central/side-band coding or the intensity stereo process result in detectable interference with an unfavourable signal composition. The process of the invention avoids such interference in that the channels are jointly coded only if the signals in both channels have similar enough spectra. In addition, it is possible with the process of the invention to attain further data reduction in that in frequency ranges in which the energy spectrum of a channel does not exceed a predeterminable fraction of the total energy spectrum, the relevant spectrum values are zeroed. As the process is independent of the specific inner structure of the coding process, it is highly versatile.

公开(公告)号：WO1981003407A1

公开(公告)日：1981-11-26

申请号：PCT/US1981000665

申请日：1981-05-19

Applicant: BRUNEY P

IPC: H04S01/00

CPC classification number: H04S1/005 ,  H04S1/002

Abstract: High fidelity playback system using at least one (for monaural) or plurality of speakers in conjunction with, for example, a conventional sound generating system (such as stereo, headphone, hearing aids, and three speaker layouts) and an image correction circuit which provides improved playback by correcting for angular image location. The system includes, for example, one, two or three transducers in various geometric positions such as two speakers arranged in front of the listener (at eg. 45` angles from a line of sight - Figures 3, 4) or behind the listener (such as in Figure 16). Three speaker geometric layouts can also be utilized (Figures 18 and 24). The preferred embodiment also provides the circuit which can be used with, for example, a stereo amplifier (Figures 1 and 14) when used with conventional stereo speakers/headphones or can be used as a hearing aid apparatus. The circuit enhances separation of individual sound generating components (such as drums, singer, trumpet, violin and the like) while taking into account "head shadow" effect.

Abstract translation: 与例如常规的声音产生系统（例如立体声，耳机，助听器和三个扬声器布局）一起使用至少一个（用于单声道）或多个扬声器的高保真度回放系统和图像校正电路，其提供 通过校正角度图像位置来改善播放。 该系统包括例如在各种几何位置中的一个，两个或三个换能器，例如布置在收听者前面的两个扬声器（例如，从视线45°的角度 - 图3,4）或听者后面 如图16）。 也可以使用三个扬声器几何布局（图18和24）。 优选实施例还提供了当与常规立体声扬声器/耳机一起使用时可以与例如立体声放大器（图1和14）一起使用的电路，或者可以用作助听器装置。 在考虑到“头影”效果的同时，该电路增强了单独的声音产生部件（例如鼓，歌手，小号，小提琴等）的分离。

公开(公告)号：WO1997036458A1

公开(公告)日：1997-10-02

申请号：PCT/RU1997000079

申请日：1997-03-24

Applicant: EFREMOV, Vladimir Anatolievich

IPC: H04S01/00

CPC classification number: H04S1/002

Abstract: The three-dimensional sound reproduction system comprises a multichannel signal source (1) and sound reproduction channels. Each sound reproduction channel comprises a low-frequency amplifier (2, 7) and loudspeakers (3, 8), these being connected in series, a probe device (4, 8), an automatic signal characteristics regulator (5, 10) and a communications link (6, 11). The output of the probe device (4, 9) is connected via the communications link (6, 11) to the first input of the automatic signal characteristics regulator (5, 10) whose second input is connected to the output of the signal source (1), whilst the output is connected to the input of the low-frequency amplifier (2, 7).

Abstract translation: 三维声音再现系统包括多声道信号源（1）和声音再现频道。 每个声音再现通道包括低频放大器（2,7）和串联连接的扬声器（3,8），探针装置（4,8），自动信号特性调节器（5,10）和 通信链路（6,11）。 探针装置（4,9）的输出经由通信链路（6,11）连接到自动信号特性调节器（5,10）的第一输入端，其第二输入端连接到信号源的输出端 1），而输出端连接到低频放大器（2,7）的输入端。

公开(公告)号：WO1997005755A1

公开(公告)日：1997-02-13

申请号：PCT/US1996012243

申请日：1996-07-25

Applicant: SRS LABS, INC.

Inventor： SRS LABS, INC. ,  KLAYMAN, Arnold ,  KRAEMER, Alan, D.

IPC: H04S01/00

CPC classification number: H03G5/025 ,  H04R5/02 ,  H04R2499/13 ,  H04S1/002 ,  H04S3/00

Abstract: An acoustic correction apparatus (20) processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when said input signals are reproduced through speakers in a sound system. The sound-energy of the left and right input signals (26 and 28) is separated and corrected in a first low-frequency range and a second high-frequency range. The resultant signals are recombined to create image-corrected audio signals (27 and 29) having a desired sound-pressure response when reproduced by the speakers in the sound system. The desired sound-pressure response creates an apparent sound image location with respect to a listener. The image-corrected signals (27 and 29) may then be spatially-enhanced to broaden the apparent sound image.

Abstract translation: 当声音系统中通过扬声器再现所述输入信号时，声学校正装置（20）处理一对左和右输入信号以补偿作为频率的函数的空间失真。 左右输入信号（26,28）的声能在第一低频范围和第二高频范围内被分离和校正。 当由声音系统中的扬声器再现时，所得到的信号被重组以产生具有期望声压响应的图像校正音频信号（27和29）。 所需的声压响应相对于听众产生明显的声音图像位置。 然后，图像校正信号（27和29）可以在空间上增强，以扩大表观声像。

公开(公告)号：WO1997004620A1

公开(公告)日：1997-02-06

申请号：PCT/JP1996001992

申请日：1996-07-17

Applicant: YUGENGAISHA I TO DENKITEKKOUSYO ,  OGITA, Kazuaki

Inventor： YUGENGAISHA I TO DENKITEKKOUSYO

IPC: H04S01/00

CPC classification number: H04S1/005

Abstract: First and second direct sound generators (3a and 3b) produce the direct sounds corresponding to the sounds reaching the ears directly from a virtual sound source (R). When the distances from the sound source (R) to the right and left ears are different, the means (3a and 3b) produce the audio signals with a prescribed time lag between them. First and second reflection generators (4a and 4b) produce false reflection as if the sounds from the sound source (R) were reflected by the shoulders. The sounds of false reflection are produced with prescribed delay from one reflection generator after the other. Summing means (7a and 7b) combine the direct sounds with the false reflection for the left and right channels, respectively, for independent reproduction through left and right headphones (8a and 8b).

Abstract translation: 第一和第二直接声音发生器（3a和3b）产生对应于直接从虚拟声源（R）到达耳朵的声音的直接声音。 当从声源（R）到左耳和左耳的距离不同时，装置（3a和3b）产生它们之间规定的时间滞后的音频信号。 第一和第二反射发生器（4a和4b）产生假反射，好像来自声源（R）的声音被肩部反射。 假反射的声音以一个反射发生器之后的规定延迟产生。 求和装置（7a和7b）分别将直接声音与左右声道的假反射组合，以通过左右耳机（8a和8b）进行独立再现。