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    Musical tone generating apparatus with reduced data storage requirements
    1.
    发明授权
    Musical tone generating apparatus with reduced data storage requirements 失效
    具有降低数据存储要求的音乐发生装置

    公开(公告)号：US4916996A

    公开(公告)日：1990-04-17

    申请号：US37510

    申请日：1987-04-13

    申请人： Hideo Suzuki ,  Masaki Kudo ,  Yasushi Kurakake

    发明人： Hideo Suzuki ,  Masaki Kudo ,  Yasushi Kurakake

    IPC分类号： G10H1/00 ,  G10H1/26 ,  G10H7/12 ,  H03M3/04

    CPC分类号： H03M3/042 ,  G10H1/0041 ,  G10H1/26 ,  G10H7/12 ,  G10H2250/595 ,  G10H2250/601

    摘要： A musical tone generating apparatus utilizing a data compression method. A musical tone is sampled and is converted into waveform data. These waveform data are compressed into compressed data by a linear predictive coding method and further by a differential quantization method. The number of bits of each of the compressed data is thus significantly smaller than that of the waveform data. Thereafter, a memory stores the thus compressed data corresponding to an attack portion of the tone and a selected part of a sustain portion of the tone. Hence, it is possible to remarkably reduce the memory storage. When generating a musical tone, the memory reads out the compressed data of the attack portion and thereafter repeatedly reads out the compressed data of the selected part. The read-out compressed data are sequentially decoded into the original digital data. Thus, the whole waveform of the musical tone is reproduced.

    Envelope shape generator for tone signal control
    2.
    发明授权
    Envelope shape generator for tone signal control 失效
    信号形状发生器，用于音调信号控制

    公开(公告)号：US4928569A

    公开(公告)日：1990-05-29

    申请号：US120071

    申请日：1987-11-13

    申请人： Masaki Kudo ,  Hideo Suzuki

    发明人： Masaki Kudo ,  Hideo Suzuki

    IPC分类号： G10H1/057

    CPC分类号： G10H1/057

    摘要： An envelope shape generator generates envelope shape data for controlling a tone signal in the form of data in decibel representation. In performing a rapid attenuation control called "forcing damp" during attenuation of the envelope shape data generated by the envelope shape generator, the envelope shape data in decibel representation is rapidly attenuated with such a characteristic that inclination of attenuation becomes increasingly steeper. This is advantageous because inclination of a rapidly attenuating portion is modified to a substantially uniform inclination when the envelope shape data is converted to data in linear representation. There are also provided a detection circuit for detecting that the level of the envelope shape has dropped below a predetermined level corresponding to a minimum level at which a tone waveshape can be effectively represented and a circuit for rapidly attenuating the envelope shape in response to this detection. This contributes to elimination of noise.

    摘要翻译： 信封形状发生器产生用于以分贝表示形式以数据形式控制音调信号的包络形状数据。 在由包络形状发生器产生的包络形状数据的衰减期间执行称为“强制潮湿”的快速衰减控制时，以分贝表示形式的包络形状数据以衰减趋势变得越来越陡峭的特性被快速衰减。 这是有利的，因为当将包络形状数据转换成线性表示的数据时，快速衰减部分的倾斜度被修改为基本均匀的倾斜。 还提供了一种检测电路，用于检测包络形状的电平已经降低到与可以有效地表示音调波形的最小电平相对应的预定电平，并且响应于该检测快速衰减包络线形状的电路 。 这有助于消除噪音。

    Electronic musical instrument having plural different tone generators employing different tone generation techniques
    3.
    发明授权
    Electronic musical instrument having plural different tone generators employing different tone generation techniques 失效
    具有不同音调生成技术的多个不同音调发生器的电子乐器

    公开(公告)号：US5094136A

    公开(公告)日：1992-03-10

    申请号：US460502

    申请日：1990-01-03

    申请人： Masaki Kudo ,  Tokio Ogi ,  Tsutomu Yanase ,  Tetsuji Ichiki

    发明人： Masaki Kudo ,  Tokio Ogi ,  Tsutomu Yanase ,  Tetsuji Ichiki

    IPC分类号： G10H1/08 ,  G10H7/00

    CPC分类号： G10H7/008 ,  G10H1/08 ,  G10H2250/035

    摘要： Two tone generators having different tone generation systems, e.g., PCM type and FM type, are provided. There are tone generation modes designating combination of tone generation in these tone generators and one can be selected from among them. There are, for example, a simple mixing mode, a delay mode in which start of tone generation in one tone generator is delayed from that in the other and a crossfade mode in which a tone signal is generated first in one tone generator and tone generation is switched to the other tone generator and envelope levels of output tone signals of the two tone generators are crossfaded during a switching period. Delay time in the delay mode and switching time in the crossfade mode can be variably controlled in accordance with a key scaling and/or other factors. A tone may be generated at a sampling frequency synchronized with a pitch in one tone generator and at a sampling frequency which is not synchronized with the pitch in the other tone generator. A phase of one cycle may be divided into plural sections and a complex waveform can be generated by converting the phase address signal in accordance with a function peculiar to each phase section and accessing a waveform memory with the converted address signal.

    Electronic keyboard musical instrument
    6.
    发明授权
    Electronic keyboard musical instrument 有权
    电子键盘乐器

    公开(公告)号：US06765142B2

    公开(公告)日：2004-07-20

    申请号：US10342879

    申请日：2003-01-14

    申请人： Shinya Sakurada ,  Masaki Kudo ,  Kozo Tokuda

    发明人： Shinya Sakurada ,  Masaki Kudo ,  Kozo Tokuda

    IPC分类号： G10H132

    CPC分类号： G10H1/346 ,  G10H2220/271 ,  G10H2220/291

    摘要： There is provided an electronic keyboard musical instrument that gives the performance feeling closer to that given by an acoustic piano and enables techniques of expression closer to those used when playing the acoustic piano. Touch information is generated based on first information output when an ON event of a first (deep) SW of a switch section occurs, and a tone generator section generates a musical tone according to the touch. When an OFF event of a third (shallow) SW of the switch section occurs during key release, the musical tone being generated is progressively damped, and at the same time a musical tone having a predetermined characteristic is generated. The OFF event of the third SW is made equivalent to a damper-leaving position in a key stroke of an acoustic piano keyboard.

    摘要翻译： 提供了一种电子键盘乐器，其性能感更接近于由原声钢琴给出的音乐，并使得演奏技术更接近于弹奏钢琴时所使用的技术。 当开关部分的第一（深）SW的ON事件发生时，基于第一信息输出产生触摸信息，并且乐音发生器部分根据触摸产生乐音。 当在键释放期间发生切换部分的第三（浅）SW的OFF事件时，正在产生的乐音被逐渐衰减，并且同时产生具有预定特性的乐音。 第三SW的OFF事件相当于声学钢琴键盘的关键行程中的阻尼器离开位置。

    Universal microcomputer chip for electronic musical machine
    7.
    发明授权
    Universal microcomputer chip for electronic musical machine 失效
    电子音乐机通用微电脑芯片

    公开(公告)号：US5804750A

    公开(公告)日：1998-09-08

    申请号：US763720

    申请日：1996-12-13

    申请人： Tokio Shirakawa ,  Masaki Kudo ,  Shizuhiko Kawai

    发明人： Tokio Shirakawa ,  Masaki Kudo ,  Shizuhiko Kawai

    IPC分类号： G10H1/18 ,  G10H1/02 ,  G10H7/00

    CPC分类号： G10H7/006 ,  G10H7/004

    摘要： A control circuit is integrated in a semiconductor chip for controlling operation of an electronic musical instrument according to a custom program stored in an external memory so as to generate a musical tone. In the control circuit, an internal memory is formed in the semiconductor chip separately from the external memory for permanently storing a common program which is dedicated to synthesis of the musical tone while the custom program stored in the external memory is customized for the operation of the electronic musical instrument. A tone synthesizer is formed in the same semiconductor chip for synthesizing -,he musical tone when the common program is executed. A central processor is formed in the same semiconductor chip integrally with the tone synthesizer and the internal memory for executing the custom program to control the operation of the electronic musical instrument and for executing the common program to effectuate the synthesis of the musical tone to generate the same sequentially in response to the operation of the electronic musical instrument.

    摘要翻译： 控制电路集成在半导体芯片中，用于根据存储在外部存储器中的定制程序控制电子乐器的操作，以便产生乐音。 在控制电路中，与外部存储器分离地形成在半导体芯片中的内部存储器，用于永久存储专用于音乐合成的公共程序，同时存储在外部存储器中的定制程序被定制用于 电子乐器。 音频合成器形成在同一半导体芯片中，用于合成 - 当执行公共节目时，它是音调。 中央处理器与与音调合成器和内部存储器整体形成在同一半导体芯片中，用于执行定制程序以控制电子乐器的操作并执行公共程序以实现乐音的合成以产生 响应于电子乐器的操作顺序地相同。

    Sound source chip having variable clock to optimize external memory access
    8.
    发明授权
    Sound source chip having variable clock to optimize external memory access 失效
    声源芯片具有可变时钟以优化外部存储器访问

    公开(公告)号：US5804749A

    公开(公告)日：1998-09-08

    申请号：US773200

    申请日：1996-12-24

    申请人： Tokio Shirakawa ,  Masaki Kudo ,  Shizuhiko Kawai

    发明人： Tokio Shirakawa ,  Masaki Kudo ,  Shizuhiko Kawai

    IPC分类号： G10H7/00 ,  G10H7/02 ,  G11C7/00 ,  G11C7/16 ,  H03M7/00

    CPC分类号： G11C7/00 ,  G10H7/002 ,  G10H7/02 ,  G11C7/16 ,  G11C2207/16

    摘要： In a sound source apparatus, a central processing unit is integrated in a semiconductor chip and operates in response to a primary operating clock signal for creating a control message. A tone generating unit is integrated in the same semiconductor chip and operates in response to a secondary operating clock signal for generating a musical tone according to the control message. A master clock generator generates a master clock signal having a desired frequency selected from a plurality of frequencies. A mode changer designates one of a first mode and a second mode corresponding to different operating speeds. A clock generator is provided for variably frequency-dividing the master clock signal to generate the primary operating clock signal and the secondary operating clock signal. The clock generator is responsive to the mode changer for changing a frequency ratio of the primary operating clock signal to the secondary operating clock signal between the first mode and the second mode. An external memory is provided separately from the semiconductor chip for storing information required for generation of the musical tone. A memory controller is provided for allotting a primary time slot to the central processing unit and a secondary time slot to the tone generating unit such as to optimize access to the external memory shared by the central processing unit and the tone generating unit. A cache memory is provided to speed up operation of the central processing unit.

    摘要翻译： 在声源装置中，中央处理单元被集成在半导体芯片中，并且响应于用于产生控制消息的主操作时钟信号而操作。 乐音产生单元集成在相同的半导体芯片中，并且响应于辅助操作时钟信号而操作，用于根据控制消息产生乐音。 主时钟发生器产生具有从多个频率选择的期望频率的主时钟信号。 模式转换器指定对应于不同操作速度的第一模式和第二模式之一。 提供时钟发生器用于可变地分频主时钟信号以产生主操作时钟信号和辅助操作时钟信号。 时钟发生器响应于模式转换器，用于在第一模式和第二模式之间改变初级工作时钟信号与辅助操作时钟信号的频率比。 与半导体芯片分离地提供外部存储器，用于存储产生音调所需的信息。 提供存储器控制器，用于将主时隙分配给中央处理单元，并将次要时隙分配给音调生成单元，以便优化对由中央处理单元和乐音发生单元共享的外部存储器的访问。 提供高速缓冲存储器以加速中央处理单元的操作。

    Musical tone generating apparatus
    9.
    发明授权
    Musical tone generating apparatus 失效
    音乐发生装置

    公开(公告)号：US5194681A

    公开(公告)日：1993-03-16

    申请号：US585381

    申请日：1990-09-20

    申请人： Masaki Kudo

    发明人： Masaki Kudo

    IPC分类号： G10H5/00 ,  G10H7/02

    CPC分类号： G10H7/02 ,  G10H5/005 ,  G10H2250/621 ,  G10H2250/631

    摘要： A tone generated by a tone source is converted to an electric signal and this electric signal is sampled. The converted digital data are stored in a first memory, and parts which are to become a initial portion and a repeating portion of a waveform of the tone source are extracted from the data in the first memory. Next, the attack end sample AES, which is the end of the initial portion, is determined. and a loop-in point (a point at which transfer from the initial portion to the repeating portion is accomplished) LIP which is in agreement with this attack end sample is obtained. Then, the loop end sample LES, which is the end of the repeating portion, is determined, and a loop start point (beginning of the repeating portion) LSP which is in agreement with this loop end sample LES is obtained. Alternatively, the beginning of the repeating portion is determined, and an end of the repeating portion or an end of the initial portion which is in agreement with this is obtained. Data are read out from the first memory in accordance with addresses corresponding to the beginning and the end of the repeating part obtained in the above manner, and these are written to a second memory. At this time, in the case in which addresses necessary for interpolation processing are obtained, reading and writing processes are carried out in accordance with the addresses used for interpolation.

    摘要翻译： 由音源产生的音调被转换为电信号，并对该电信号进行采样。 转换的数字数据被存储在第一存储器中，并且从第一存储器中的数据中提取要成为音源的初始部分和重复部分的部分。 接下来，确定作为初始部分结束的攻击结束样本AES。 并且获得与该攻击结束样本一致的LIP（从初始部分到重复部分的转移）的循环点。 然后，确定作为重复部分结束的循环结束样本LES，并且获得与该循环结束样本LES一致的循环起始点（重复部分的开始）LSP。 或者，确定重复部分的开始，并且获得与此一致的重复部分的结束或初始部分的结束。 根据与以上述方式获得的重复部分的开始和结束对应的地址，从第一存储器中读出数据，并将它们写入第二存储器。 此时，在获得内插处理所需的地址的情况下，根据用于插值的地址进行读取和写入处理。