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公开(公告)号：US4245541A
公开(公告)日：1981-01-20
申请号：US46135
申请日：1979-06-01
申请人： Ralph Deutsch
发明人： Ralph Deutsch
CPC分类号： G10H7/04 , G10H1/125 , G10H2250/141 , G10H2250/545
摘要： In a musical instrument in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced points defining a cycle of an audio waveform are transferred sequentially from a waveshape memory in repetitive cycles at a rate proportional to the pitch of the tone being generated, apparatus is provided for reducing undesired frequency components resulting from the conversion of the digital signals into analog musical signals. The noise reduction apparatus applies optimal amplitude weighting values to a subset of the stored data words and adds these weighted values together to provide a new single value which is used for the output signal.
摘要翻译： 在一种乐器中，其中对应于限定音频波形的周期的相应数量的均匀间隔的点的幅度的多个数据字以重复循环的顺序从波形存储器以与音调的音调成比例的速率被顺序地传送 被提供用于减少由数字信号转换为模拟音乐信号而产生的不期望频率分量的装置。 噪声降低装置对存储的数据字的子集应用最佳幅度加权值，并将这些加权值相加，以提供用于输出信号的新的单个值。
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公开(公告)号：US3972259A
公开(公告)日：1976-08-03
申请号：US509705
申请日：1974-09-26
申请人： Ralph Deutsch
发明人： Ralph Deutsch
CPC分类号： G10H7/105 , G10H2250/141
摘要： In a computor organ, musical tones are generated by separately evaluating the constituent Fourier components of a musical waveshape and summing these to obtain the waveshape sample point amplitudes. The relative amplitude contribution of each Fourier component is established by a harmonic coefficient. In accordance with the present invention, pulse-type tone generation is simulated by using harmonic coefficient values associated with the frequency spectrum of a pulse train of particular pulse shape. For example, the coefficients may be given by the Fourier transform associated with repetitive pulses.To simulate pulse width modulation effects, a set of such coefficients is stored in a memory, the set having more coefficients than the maximum number of Fourier components included in each amplitude computation. Pulse trains of different pulse width are simulated by utilizing different subsets of the stored coefficients in the amplitude computation. Pulse width modulation tonal effects are achieved by changing the selected subsets as a function of time.
摘要翻译： 在计算机器官中，通过分别评估音乐波形的组成傅立叶分量并对其进行求和来产生乐音，以获得波形采样点振幅。 每个傅立叶分量的相对幅度贡献由谐波系数确定。 根据本发明，通过使用与特定脉冲形状的脉冲串的频谱相关联的谐波系数值来模拟脉冲型音产生。 例如，可以通过与重复脉冲相关联的傅里叶变换来给出系数。
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公开(公告)号：US4656912A
公开(公告)日：1987-04-14
申请号：US781361
申请日：1985-09-30
申请人： Ralph Deutsch
发明人： Ralph Deutsch
CPC分类号： G10H7/105 , G10H2250/141
摘要： A keyboard operated electronic musical instrument is disclosed which has a number of tone generators that are assigned to actuated keyswitches. Musical tones are produced by computing a master data set which defines the data points corresponding to a period of a musical waveshape. The master data set points are read out sequentially and repetitively from a memory and converted into an audible musical tone. Circuitry is provided whereby the master data set is computed from a time sequence of harmonic coefficients which is modulated to produce a musical tone having a time variant spectra.
摘要翻译： 公开了一种键盘操作的电子乐器，其具有分配给致动的钥匙开关的多个音调发生器。 通过计算定义对应于音乐波形的周期的数据点的主数据集来产生乐音。 主数据设定点从存储器顺序地和重复地读出并转换成可听到的音调。 提供电路，由此根据被调制以产生具有时变频谱的音调的谐波系数的时间序列来计算主数据集。
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4.发明授权
公开(公告)号：US4655115A
公开(公告)日：1987-04-07
申请号：US644139
申请日：1984-08-23
申请人： Tetsuo Nishimoto
发明人： Tetsuo Nishimoto
CPC分类号： G10H7/12 , G10H1/053 , G10H2250/141 , Y10S84/10
摘要： In a musical tone synthesizer in which an amplitude-modulated carrier wave delivered from an amplitude modulator is used to form a musical tone signal, the amplitude-modulated carrier wave is fed back to the input side of the amplitude modulator as a modulation signal, a portion thereof, a portion of a carrier wave or a composite signal of the modulation signal and the carrier wave. The amount of feedback may be controlled by multiplying the amplitude-modulated carrier wave with a predetermined modulation index. Furthermore, the modulation index may be charged with time so that the control of spectrum construction of the musical tone signal is readily performed. According to a modified embodiment, a plurality of amplitude-modulators are provided which are connected in a ring form feedback loop in which the modulated outputs of preceding amplitude modulators are supplied respectively to succeeding amplitude modulators.
摘要翻译： 在其中使用从振幅调制器传送的调幅载波形成乐音信号的乐音合成器中，幅度调制载波被作为调制信号反馈到幅度调制器的输入侧， 部分，载波的一部分或调制信号和载波的复合信号。 可以通过将调幅载波与预定的调制指数相乘来控制反馈量。 此外，调制指数可以随时间充电，从而容易地执行乐音信号的频谱构造的控制。 根据修改的实施例，提供多个幅度调制器，其以环形反馈环路连接，其中先前振幅调制器的调制输出分别提供给后续的幅度调制器。
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公开(公告)号：US4644839A
公开(公告)日：1987-02-24
申请号：US852390
申请日：1986-04-15
申请人： Tetsuo Nishimoto
发明人： Tetsuo Nishimoto
CPC分类号： G10H7/08 , G10H2250/141
摘要： The generating function cos[Z(t).multidot.sin(.omega.'t)] of Bessel functions is utilized as a modulating function for a fundamental function sin(.omega.t) in synthesis of a musical tone including many harmonic (over tone) components, wherein Z(t) is used as a modulating index. The modulating frequency .omega.' in sin(.omega.'t) of the modulating function cos[Z(t).multidot.sin(.omega.'t)] is selected relative to the fundamental frequency so that w'=n.omega. wherein n is a half integer or an irrational number.
摘要翻译： 贝塞尔函数的生成函数cos [Z（t）xsin（ω，t）]被用作合成包含许多谐波（过调）成分的乐音的基函数sin（ω）的调制函数，其中 Z（t）用作调制指数。 相对于基频选择调制函数cos [Z（t）xsin（ω-t）]的sin（ω't）中的调制频率ω''，使得w'=nω，其中n是半整数或 一个不合理的数字。
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公开(公告)号：US4256003A
公开(公告)日：1981-03-17
申请号：US58882
申请日：1979-07-19
申请人： Ralph Deutsch
发明人： Ralph Deutsch
CPC分类号： G10H7/08 , G10H2250/141
摘要： In a musical instrument in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced points defined a cycle of an audio waveform are transformed at an average rate proportional to the pitch of the tone being generated, a frequency generator is provided using a single master clock source for selectively producing the entire range of musical notes. A non-integer frequency generator is implemented which periodically adds a frequency number, corresponding to an actuated keyswitch, to itself in an adder-accumulator. Overflow pulses from the adder-accumulator address out a set of waveshape values stored in a memory. The noise produced by the unequally spaced overflow pulses is reduced by applying optimal amplitude weighting values to the output waveshape values and then adding the weighted values to provide a single value which is converted to an analog signal and furnished as the musical signal.
摘要翻译： 在其中以与所生成的音调的音调成比例的平均速率变换定义为音频波形的周期的相应数量的均匀间隔的点的幅度的多个数据字的乐器中，频率发生器是 提供使用单个主时钟源来选择性地产生音符的整个范围。 实现了一种非整数频率发生器，其在加法器 - 累加器中周期性地添加对应于致动的钥匙开关的频率号码。 来自加法器 - 累加器的溢出脉冲输出存储在存储器中的一组波形值。 通过对输出波形值应用最佳幅度加权值，然后将加权值相加以提供转换为模拟信号并作为音乐信号提供的单个值，从而减小由不等间隔的溢出脉冲产生的噪声。
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7.发明申请公开(公告)号：US20180090120A1
公开(公告)日：2018-03-29
申请号：US15697094
申请日：2017-09-06
发明人： Kazutaka KASUGA
CPC分类号： G10H5/007 , G10H1/043 , G10H1/06 , G10H2220/361 , G10H2230/205 , G10H2230/241 , G10H2250/141 , G10H2250/465 , G10H2250/515 , G10H2250/521
摘要： An electronic musical instrument uses a mouthpiece model that models a mouthpiece as a three-dimensional shape having one end at which the mouthpiece is to be held in a mouth of a performer being smaller than another end. A processor in the instrument calculates a reflection coefficient of a progressive wave and a regressive wave using the mouthpiece model by calculating a wave impedance for the progressive wave and calculating a wave impedance for the regressive wave, and generates a musical sound signal on the basis of the calculated reflection coefficient, which is then outputted to a sound generator for sound production.
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公开(公告)号：US5218156A
公开(公告)日：1993-06-08
申请号：US671358
申请日：1991-03-19
申请人： Akira IIzuka , Kenji Kawakami
发明人： Akira IIzuka , Kenji Kawakami
CPC分类号： G10H7/06 , G10H2250/141 , Y10S84/10
摘要： A musical tone synthesizing apparatus comprising FM operators and connection control device. At least one of the FM operators comprises a waveform memory, phase data generation device, and output inversion device. The waveform memory stores fundamental waveform data. The phase data generation device generates phase data as an address signal for accessing the waveform memory on the basis of a musical tone designation signal and a modulation signal inputted from an external circuit. The output inversion device selects whether a waveform signal read out from the waveform memory is outputted after sign inversion, or is outputted directly. The connection control device arbitrarily combine connections of the FM operators.
摘要翻译： 一种包括FM操作员和连接控制装置的乐音合成装置。 FM操作器中的至少一个包括波形存储器，相位数据生成装置和输出反转装置。 波形存储器存储基波形数据。 相位数据生成装置根据音调指定信号和从外部电路输入的调制信号，生成用于访问波形存储器的地址信号的相位数据。 输出反转装置选择在符号反转之后是否输出从波形存储器读出的波形信号，或直接输出。 连接控制装置任意组合FM操作员的连接。
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公开(公告)号：US5038661A
公开(公告)日：1991-08-13
申请号：US294901
申请日：1989-01-05
申请人： Yoji Kaneko
发明人： Yoji Kaneko
CPC分类号： G10H7/008 , G10H7/12 , G10H2250/141
摘要： A plurality of waveforms are time-divisionally obtained from a waveform generator in one sampling period under the control of a controller. The sampling period is equally divided into a plurality of module periods. Each module period is also divided to correspond to the number of waves which are obtained time-divisionally. The waveform generator includes a selector which uses waveform data produced in a preceding module in the sampling period as that for waveform generation in the following module.
摘要翻译： 在控制器的控制下，在一个采样周期中从波形发生器时分地得到多个波形。 采样周期被等分成多个模块周期。 每个模块周期也被分为对应于分时获得的波数。 波形发生器包括选择器，其使用在采样周期中的前一模块中产生的波形数据作为下一个模块中波形生成的波形数据。
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公开(公告)号：US4249447A
公开(公告)日：1981-02-10
申请号：US52587
申请日：1979-06-27
申请人： Norio Tomisawa
发明人： Norio Tomisawa
CPC分类号： G10H7/12 , G10H2250/141
摘要： A method for producing a tone waveform having a desired spectral construction by modulating an input address signal of a selected frequency for a waveform memory. For the modulation of the input address signal, the output of the waveform memory is multiplied by a parameter .beta. of a suitable value and the multiplication product is added to the input address signal. If the input address varies in the manner of, for example, a saw-tooth wave, a desired tone waveform can be produced within a range between a saw-tooth wave and a sinusoidal wave by selecting a suitable value of the parameter .beta.. More specifically, a saw-tooth wave is produced as a tone wave form if a sufficiently large value of .beta. is selected. As .beta. is gradually decreased, the amplitude is decreased from a higher order and the amplitude also disappears from a higher order until the tone waveform becomes a sinusoidal wave when .beta. is zero. The waveform memory having its input address modulated in the above described manner is used not only for directly producing a desired tone waveform but for modulating an input address of another waveform memory. In the latter case, a tone waveform is produced by the other waveform memory.
摘要翻译： 一种用于通过调制用于波形存储器的选定频率的输入地址信号来产生具有所需频谱结构的乐音波形的方法。 对于输入地址信号的调制，波形存储器的输出乘以适当值的参数β，并将乘积加到输入地址信号上。 如果输入地址以例如锯齿波的方式变化，则可以通过选择参数β的适当值在锯齿波和正弦波之间的范围内产生期望的乐音波形。 更具体地，如果选择足够大的β值，则产生锯齿波作为音调波形。 随着β逐渐减小，振幅从较高阶降低，并且当β为零时，振幅也从高阶消失直到音调波形变为正弦波。 具有以上述方式调制其输入地址的波形存储器不仅用于直接产生所需音调波形，而且用于调制另一波形存储器的输入地址。 在后一种情况下，其他波形存储器产生乐音波形。
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