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公开(公告)号：EP0599450A3
公开(公告)日：1994-11-17
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.
摘要翻译： 由麦克风拾取的声音信号在包括数字滤波器的how叫抑制器中处理。 频率分析仪执行所拾取的声音信号的频率分析。 啸声检测器从频率分析仪的频率分析结果中检测声音信号中包含的啸叫。 操作部分计算要被设置到数字滤波器的系数，以根据how检测器的检测结果来抑制啸叫，并且控制部分将计算的系数设置到数字滤波器。 啸声检测器在最大峰值功率电平与声音信号的平均功率电平的比率较大时判定在由频率分析器分析的频率区域中的声音信号的功率电平当中的最大峰值功率电平是啸声分量 超过预定阈值水平，优选预定阈值时间。 此外，提供了阈值控制装置，用于控制阈值电平和/或阈值时间，以提高啸声检测的准确性。
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公开(公告)号：EP0553832A1
公开(公告)日：1993-08-04
申请号：EP93101343.7
申请日：1993-01-29
发明人： Matsumoto, Masaharu , Serikawa, Mitsuhiko , Kawamura, Akihisa , Numazu, Hiroko , Norimatsu, Takeshi , Tagami, Ryo , Oda, Mikio
CPC分类号： H04S1/002 , H04S1/007 , H04S5/00 , H04S7/305 , H04S2400/01
摘要： A sound field controller for generating apparent sound sources (CL, CR, LL, RR) by adjusting the amplitude and delay time of a sound signal so that the sound will be perceived by plural listeners (8, 8-1, 8-2) as sound coming from a location separated from the specific location of the front speakers (4, 6), and for additionally controlling the effect of the apparent sound sources by evaluating the attributes of the source sound signal. The controller includes FIR filters (11, 13) for generating a left sound pattern signal (hL(n)), FIR filters (12, 14) for generating a right sound pattern signal (hR(n)), a first delay circuit (15, 18) for delaying the left and right sound pattern signals by a first predetermined time and applying the delayed left and right sound pattern signals to the left and right speakers, respectively, to introduce an apparent sound source (CL) located left rear of a center listener; and a second delay circuit (16, 17) for delaying the left and right sound pattern signals by a second predetermined time and applying the delayed left and right sound pattern signals to the right and left speakers, respectively, to introduce an apparent sound source (CR) located right rear of a center listener.
摘要翻译： 一种用于通过调节声音信号的幅度和延迟时间来产生视听声源（CL，CR，LL，RR）的声场控制器，使得声音将被多个听众（8,8-1,8-2）感知， 作为来自与前置扬声器（4,6）的特定位置分离的位置的声音，并且用于通过评估源声音信号的属性来附加地控制表观声源的效果。 控制器包括用于产生左声音模式信号（hL（n））的FIR滤波器（11,13），用于产生右声音模式信号（hR（n））的FIR滤波器（12,14），第一延迟电路 用于将左右声音图形信号延迟第一预定时间，并将延迟的左右声音图形信号分别施加到左和右扬声器，以将左后方的声音信号（CL）引入到左后方 中心听众 以及用于将左右声音图形信号延迟第二预定时间的第二延迟电路（16,17），并且将延迟的左右声音图案信号分别施加到左右扬声器以引入表观声源（ CR）位于中心听众的右后方。
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公开(公告)号：EP0544647A3
公开(公告)日：1993-07-21
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.-
公开(公告)号：EP0422955A3
公开(公告)日：1992-04-15
申请号：EP90311222.5
申请日：1990-10-12
CPC分类号： H04S1/002 , G10K15/08 , H03G5/165 , H03H17/0264 , H04S1/007
摘要： In the process of forming the effect sound for reproducing a sound field, a down-sampling part for reducing the sampling frequency of the digital signal is disposed before the step of the digital operation which becomes the central part of the forming process, by which a large amount of operation processing is carried out at a low sampling rate. With respect to the direct sound, processing such as gain adjustment is carried out without decreasing the sampling frequency. This is a sound field control system which permits to realize the higher quality and natural sound field control effect without much increasing the hardware scale.
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公开(公告)号：EP0453293A2
公开(公告)日：1991-10-23
申请号：EP91303484.9
申请日：1991-04-18
发明人： Kawamura, Akihisa , Serikara, Mitsuhiko , Matsumoto, Masaharu , Numazu, Hiroko , Sato, Katsuaki
摘要： A sound field variable apparatus comprises direct-sound and indirect-sound collecting microphones (1,4) an adaptive filter (7) for obtaining a transfer function between the indirect-sound collecting microphone (4) and an indirect-sound reproducing speaker, and a signal generator (8) for generating a signal used for measuring a transfer function to be set in the adaptive filter (7). The transfer function between the indirect-should collecting microphone set at a desired position and the indirect-sound reproducing speaker is measured by a control circuit (20), and the transfer function thus measured is set to the adaptive filter (7) so that an echo generated caused by the acoustic combination between the indirect-sound reproducing speaker can be cancelled whereby to prevent howling from taking place.
摘要翻译： 声场可变装置包括直接声音和间接声音采集麦克风（1,4），用于获得间接声音采集麦克风（4）和间接声音再现扬声器之间的传递函数的自适应滤波器（7），以及 信号发生器（8），用于产生用于测量要在自适应滤波器（7）中设置的传递函数的信号。 通过控制电路（20）测量设置在期望位置的间接声音重放麦克风与间接声音重放扬声器之间的传递函数，并将如此测量的传递函数设置到自适应滤波器（7） 可以取消由间接声音再现扬声器之间的声学组合引起的回声，从而防止发生how叫。
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公开(公告)号：EP0422955A2
公开(公告)日：1991-04-17
申请号：EP90311222.5
申请日：1990-10-12
CPC分类号： H04S1/002 , G10K15/08 , H03G5/165 , H03H17/0264 , H04S1/007
摘要： In the process of forming the effect sound for reproducing a sound field, a down-sampling part for reducing the sampling frequency of the digital signal is disposed before the step of the digital operation which becomes the central part of the forming process, by which a large amount of operation processing is carried out at a low sampling rate. With respect to the direct sound, processing such as gain adjustment is carried out without decreasing the sampling frequency. This is a sound field control system which permits to realize the higher quality and natural sound field control effect without much increasing the hardware scale.
摘要翻译： 在形成用于再现声场的效果声音的过程中，用于降低数字信号的采样频率的下采样部分设置在成为处理的中心部分的数字操作的步骤之前， 以低采样率进行大量的操作处理。 对于直接声音，在不降低采样频率的情况下执行诸如增益调整的处理。 这是一种声场控制系统，可以在不增加硬件规模的情况下实现更高质量和自然的声场控制效果。
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57.发明公开
公开(公告)号：EP0288159A3
公开(公告)日：1990-06-20
申请号：EP88302565.2
申请日：1988-03-23
CPC分类号： H03G5/005
摘要： A digital equalizer for audio system applications is based on a FIR (17) (finite impulse response) digital filter whose amplitude and phase/frequency characteristics can be respectively independently established in accordance with input data representing an arbitrary amplitude/frequency characteristic (11) and input phase data (12) from which an arbitrary phase/frequency characteristic for the filter can be derived. In addition to audio frequency response equalization, the apparatus can be provided with a microphone howl suppression function.
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公开(公告)号：EP0284175A3
公开(公告)日：1989-09-20
申请号：EP88300324.6
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 an inputting circuit (1) for inputting a desirable frequency property, a division circuit (2) for dividing the inputted frequency property into a plurality of frequency bands, and a calculating circuit for obtaining filter factors for realizing a frequency property of each of the divided frequency bands. The inputting circuit inputs the frequency property with a frequency resolution corresponding to the number of the filter factors. The division circuit performs a correction for a division so that the frequency property becomes zero from a frequency over the high cut-off frequency of a band-pass filter toward the Nyquist frequency of the frequency band corresponding to the transversal filter, the Nyquist frequency being 1/2 of the sampling frequency. The calculating circuit has a transformation unit (3) for performing a Hilbert transformation or a linear phase transformation with respect to the respective frequency properties divided by said division means.
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59.发明公开
公开(公告)号：EP0284175A2
公开(公告)日：1988-09-28
申请号：EP88300324.6
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 an inputting circuit (1) for inputting a desirable frequency property, a division circuit (2) for dividing the inputted frequency property into a plurality of frequency bands, and a calculating circuit for obtaining filter factors for realizing a frequency property of each of the divided frequency bands. The inputting circuit inputs the frequency property with a frequency resolution corresponding to the number of the filter factors. The division circuit performs a correction for a division so that the frequency property becomes zero from a frequency over the high cut-off frequency of a band-pass filter toward the Nyquist frequency of the frequency band corresponding to the transversal filter, the Nyquist frequency being 1/2 of the sampling frequency. The calculating circuit has a transformation unit (3) for performing a Hilbert transformation or a linear phase transformation with respect to the respective frequency properties divided by said division means.
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。 该装置包括用于输入期望的频率特性的输入电路（1），用于将输入的频率特性分成多个频带的分频电路（2），以及用于获得用于实现每个频带特性的滤波因子的计算电路 的分频。 输入电路以频率分辨率输入频率特性，频率分辨率与滤波因子的数量相对应。 分频电路进行除法校正，使频率特性从带通滤波器的高截止频率的频率向与横向滤波器对应的频带的奈奎斯特频率成为零，奈奎斯特频率为 采样频率的1/2。 计算电路具有变换单元（3），用于相对于由所述分割装置划分的相应频率特性执行希尔伯特变换或线性相位变换。
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