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    Filter device and electronic musical instrument using the filter device
    2.
    发明公开
    Filter device and electronic musical instrument using the filter device 有权
    Filtervorrichtung und elektronisches Musikinstrument mit der Filtervorrichtung

    公开(公告)号：EP1903556A2

    公开(公告)日：2008-03-26

    申请号：EP07018319.9

    申请日：2007-09-18

    申请人： CASIO COMPUTER CO., LTD.

    发明人： Kaneko, Yoji

    IPC分类号： G10H7/10

    CPC分类号： G10H1/125 ,  G10H7/02 ,  G10H2210/221 ,  G10H2250/095 ,  G10H2250/121 ,  G10H2250/615

    摘要： In a filter device, a filter coefficient calculation circuit (26) has a parameter table. The parameter table stores a plurality of sets of filter coefficients associated with a first parameter based on a frequency and a second parameter based on respective plurality of levels representing a degree of attenuation or enhancement of a gain of a filter in filter characteristics. The filter coefficient calculation circuit (26) extracts a set of filter coefficients from a parameter table (35) with the use of the first parameter and the second parameter determined according to a frequency and a strength of a musical sound signal, and outputs the extracted set of filter coefficients to the filter (22). The filter circuit (22) performs filter processing for the musical sound signal, based on the filter characteristics determined by the set of filter coefficients.

    摘要翻译： 在滤波器装置中，滤波器系数计算电路（26）具有参数表。 参数表基于表示滤波器特性中的滤波器的增益的衰减程度或增强度的相应多个级别，基于频率和第二参数存储与第一参数相关联的多组滤波器系数。 滤波器系数计算电路（26）使用根据音乐声音信号的频率和强度确定的第一参数和第二参数从参数表（35）提取一组滤波器系数，并输出提取的 滤波器系数集合到滤波器（22）。 滤波器电路（22）基于由滤波器系数集合确定的滤波特性，对音乐声音信号进行滤波处理。

    Tone signal processing device using a digital filter
    3.
    发明公开
    Tone signal processing device using a digital filter 失效
    使用数字滤波器的音频信号处理装置

    公开(公告)号：EP0266703A3

    公开(公告)日：1990-02-14

    申请号：EP87116017.2

    申请日：1987-10-31

    申请人： YAMAHA CORPORATION

    发明人： Suzuki, Hideo c/o YAMAHA CORPORATION ,  Fujita, Yoshio c/o YAMAHA CORPORATION ,  Kuribayashi, Hirotaka c/o YAMAHA CORPORATION

    IPC分类号： G10H1/12 ,  G10H7/00

    CPC分类号： G10H7/002 ,  G10H1/125 ,  G10H2250/095 ,  G10H2250/115

    摘要： At least two sets of filter coefficients corresponding to differenct filter characteristics are interpolated by using a control signal for controlling tone color as a parameter of interpolation. Filter coefficients obtained by the interpolation are supplied to a digital filter (201) to determined its filter characteristics and an input tone signal is modified in accordance with the filter characteristics thus determined. Filter characteristics of diverse variation as compared with the number of prepared filter coefficients can thereby be realized. Further, timewise change of filter characteristics can be realized by changing a parameter of interpolation with lapse of time or changing two sets of filter coefficients to be interpolated with lapse of time. Designation of filter coefficients can be made by designating coordinate data of coordinates having at least two axes. In this case, filter coefficients can be changed by changing coordinate data of at least one axis in accordance with tone color control information whereby filter characteristics can be variably controlled.

    Musical tone producing device of waveshape memory readout type
    4.
    发明公开
    Musical tone producing device of waveshape memory readout type 失效
    Vorrichtung mit Wellenformspeicher zur Musiktonerzeugung。

    公开(公告)号：EP0140008A1

    公开(公告)日：1985-05-08

    申请号：EP84110222.1

    申请日：1984-08-28

    申请人： YAMAHA CORPORATION

    发明人： Suzuki, Hideo

    IPC分类号： G10H7/04 ,  G10H1/055

    CPC分类号： G10H1/125 ,  G10H1/055 ,  G10H2250/095 ,  Y10S84/09

    摘要： A full waveshape of a musical tone to be produced from the start to the end of sounding or a rise portion and a part of the waveshape following the rise portion of the musical tone is stored in a waveshape memory (12), and the musical tone is formed by reading out the waveshape from the waveform memory once, or reading out the rise portion once and thereafter reading out the partial waveshape repeatedly. A digital filter (14) is introduced following the waveshape memory (12) in this tone-producing device. The filter characteristics are determined in accordance with a tone color change parameter such as the key touch or the tone pitch of the musical tone, thereby realizing a tone color change of the muscial tone. Further, in order to realize timewise change of tone color of the musical tone, circuit which lets the tone color change parameter vary with time is proposed.

    摘要翻译： 从音乐的开始到结束产生的音调的完整波形或音乐的上升部分之后的上升部分和波形的一部分被存储在波形存储器（12）中，并且音调 通过从波形存储器读出波形一次，或者一次读出上升部分，然后重复地读出部分波形而形成。 在该音调产生装置中的波形存储器（12）之后引入数字滤波器（14）。 根据音调变化参数（例如按键触摸或音调的音调）来确定滤波器特性，从而实现乐音的音调变化。 此外，为了实现音调的色调的时间变化，提出了使音色变化参数随时间变化的电路。

    Filter device and electronic musical instrument using the filter device
    5.
    发明公开
    Filter device and electronic musical instrument using the filter device 有权
    过滤器装置和具有所述过滤器装置的电子乐器

    公开(公告)号：EP1903556A3

    公开(公告)日：2011-04-13

    申请号：EP07018319.9

    申请日：2007-09-18

    申请人： CASIO COMPUTER CO., LTD.

    发明人： Kaneko, Yoji

    IPC分类号： G10H7/10 ,  G10H7/02

    CPC分类号： G10H1/125 ,  G10H7/02 ,  G10H2210/221 ,  G10H2250/095 ,  G10H2250/121 ,  G10H2250/615

    摘要： In a filter device, a filter coefficient calculation circuit (26) has a parameter table. The parameter table stores a plurality of sets of filter coefficients associated with a first parameter based on a frequency and a second parameter based on respective plurality of levels representing a degree of attenuation or enhancement of a gain of a filter in filter characteristics. The filter coefficient calculation circuit (26) extracts a set of filter coefficients from a parameter table (35) with the use of the first parameter and the second parameter determined according to a frequency and a strength of a musical sound signal, and outputs the extracted set of filter coefficients to the filter (22). The filter circuit (22) performs filter processing for the musical sound signal, based on the filter characteristics determined by the set of filter coefficients.

    Tone signal processing device using a digital filter
    7.
    发明公开
    Tone signal processing device using a digital filter 失效
    Tonsignalverarbeitungsvorrichtung mit einem digitalen Filter。

    公开(公告)号：EP0266703A2

    公开(公告)日：1988-05-11

    申请号：EP87116017.2

    申请日：1987-10-31

    申请人： YAMAHA CORPORATION

    发明人： Suzuki, Hideo c/o YAMAHA CORPORATION ,  Fujita, Yoshio c/o YAMAHA CORPORATION ,  Kuribayashi, Hirotaka c/o YAMAHA CORPORATION

    IPC分类号： G10H1/12 ,  G10H7/00

    CPC分类号： G10H7/002 ,  G10H1/125 ,  G10H2250/095 ,  G10H2250/115

    摘要： At least two sets of filter coefficients corresponding to differenct filter characteristics are interpolated by using a control signal for controlling tone color as a parameter of interpolation. Filter coefficients obtained by the interpolation are supplied to a digital filter (201) to determined its filter characteristics and an input tone signal is modified in accordance with the filter characteristics thus determined. Filter characteristics of diverse variation as compared with the number of prepared filter coefficients can thereby be realized. Further, timewise change of filter characteristics can be realized by changing a parameter of interpolation with lapse of time or changing two sets of filter coefficients to be interpolated with lapse of time. Designation of filter coefficients can be made by designating coordinate data of coordinates having at least two axes. In this case, filter coefficients can be changed by changing coordinate data of at least one axis in accordance with tone color control information whereby filter characteristics can be variably controlled.

    摘要翻译： 通过使用用于控制音色的控制信号作为内插参数来内插与差分滤波特性对应的至少两组滤波器系数。 通过内插获得的滤波器系数被提供给数字滤波器（201）以确定其滤波特性，并且根据如此确定的滤波器特性修改输入音调信号。 因此可以实现与制备的滤波器系数的数量相比的不同变化的滤波器特性。 此外，滤波器特性的时间变化可以通过改变经过时间的插值参数或者随着时间的推移改变要插值的两组滤波器系数来实现。 可以通过指定具有至少两个轴的坐标的坐标数据来进行滤波器系数的指定。 在这种情况下，可以通过根据音调控制信息改变至少一个轴的坐标数据来改变滤波器系数，从而可以可变地控制滤波器特性。

    Tone signal processing device
    8.
    发明公开
    Tone signal processing device 失效
    音频信号处理装置

    公开(公告)号：EP0178840A3

    公开(公告)日：1987-09-16

    申请号：EP85307207

    申请日：1985-10-08

    申请人： Nippon Gakki Seizo Kabushiki Kaisha

    发明人： Katoh, Mitsumi

    IPC分类号： G10H01/12

    CPC分类号： G10H1/125 ,  G10H2250/095 ,  G10H2250/115 ,  G10H2250/545 ,  Y10S84/09

    摘要： A digital filter (8) is provided between a tone signal generation circuit (1) which supplies a digital tone signal in accordance with a first sampling frequency and a sampling circuit (7) which resamples this digital tone signal in accordance with a second sampling frequency which is lower than the first sampling frequency. This digital filter (8) filters the input digital tone signal with such amplitude-frequency characteristics as to be able to substantially remove an aliasing noise produced due to the second sampling frequency (e.g., with low-pasa filter characteristics having a cut-off frequency which is 1/2 the second sampling frequency). This removes high frequency components producing an aliasing noise from the digital tone signal before it Is applied to the resampling circuit whereby generation of the aliasing noise in resampling is prevented. The resampling is performed for adapting the digital tone signal to an operation clock frequency of an effect imparting circuit (4) provided in a posterior stage for imparting, in digital, a tone effect such as a modulation effect to the digital tone signal.