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公开(公告)号：US3935783A
公开(公告)日：1976-02-03
申请号：US486503
申请日：1974-07-08
CPC分类号： G10H1/057
摘要： The embodiment of the invention disclosed herein is directed to an electronic musical instrument of the keyboard type used to electronically reproduce piano sounds. The circuit has means to vary the amplitude of the piano voice in response to the velocity of the downward movement of the key. Means are provided for producing a fundamental square wave frequency and the second and fourth harmonics thereof, in response to the actuation of a given key on the keyboard. One circuit arrangement includes means for combining the fundamental frequency and the second and fourth harmonics in a predetermined time relation to produce the zero, attack, peak, and decay characteristics of a piano voice as actually produced by a piano string. Amplitude limiting means are coupled to the circuit for controlling the amplitude of the harmonics in response to predetermined values so that mixing of the fundamental frequency and the second and fourth harmonics along predetermined points of the piano voice characteristics curve will more accurately reproduce electronically the sounds of a piano. Another circuit arrangement provides means for rapid recovery of the piano circuit so that the keys can be actuated in rapid succession.
摘要翻译： 本文公开的本发明的实施例涉及用于电子地再现钢琴声音的键盘类型的电子乐器。 电路具有响应于键的向下移动的速度来改变钢琴声音的幅度的装置。 提供了用于响应于键盘上的给定键的致动而产生基本方波频率及其第二和第四谐波的装置。 一个电路装置包括用于以预定时间关系组合基频和第二和第四谐波以产生由钢琴弦实际产生的钢琴声音的零，攻击，峰值和衰减特性的装置。 幅度限制装置被耦合到电路，用于响应于预定值来控制谐波的幅度，使得沿着钢琴声音特征曲线的预定点的基频和第二和第四谐波的混合将更准确地再现电声中的声音 一架钢琴 另一个电路装置提供了用于钢琴电路的快速恢复的装置，使得键可以快速连续地致动。
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公开(公告)号：US3924505A
公开(公告)日：1975-12-09
申请号：US41577473
申请日：1973-11-14
申请人： HAMMOND CORP
发明人： SCHRECONGOST RAY B
CPC分类号： G10H1/057
摘要： Post-keyswitch-release and percussion sustain keying circuits in which a variety of player selectable sustain control signals applied to a sustain control terminal coupled to a time constant circuit through a diode gate produce differing modes of sustain and in some modes player settable sustain intervals. In addition, several octave groups of percussion sustain keying circuits having the same timing circuit component values have scaled sustain time constants by varying the sustain control signal applied to each octave group.
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公开(公告)号：US3848142A
公开(公告)日：1974-11-12
申请号：US34304873
申请日：1973-03-20
发明人： ADACHI T
摘要： A conventional envelope signal forming circuit for producing percussive envelope signals in an electronic musical instrument is improved by the provision of a circuitry for setting a control voltage which is utilized to control a charge-discharge capacitor therein so as to reduce the overlapping of a plurality of envelope signals in one aspect of this invention and to allow the envelope signal to have a controllable sustained portion in another aspect thereof.
摘要翻译： 通过提供用于设定用于控制其中的充放电电容器的控制电压的电路来改进用于在电子乐器中产生冲击包络信号的常规包络信号形成电路，以减少多个 包络信号，并且允许包络信号在其另一方面具有可控制的持续部分。
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94.发明授权Percussion to direct keying switching circuit for an electrical musical instrument 失效直接用于电子乐器的关键切换电路的考虑
公开(公告)号：US3821459A
公开(公告)日：1974-06-28
申请号：US36887973
申请日：1973-06-11
申请人： HAMMOND CORP
发明人： SCHRECONGOST R
摘要： In an electrical musical instrument having a plurality of selectively played keys each for connecting a tone generator keyer to a source of keying voltage through a related percussion keyer circuit, a percussion to direct keying switching circuit for selectively providing percussion and direct keying operation of all of the tone generator keyers by operation of a single control switch.
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公开(公告)号：US3746775A
公开(公告)日：1973-07-17
申请号：US3746775D
申请日：1972-03-16
发明人： UCHIYAMA Y
摘要： In an electronic musical instrument, a sustain keyer circuit comprises a field effect transistor, a resistor and a keyoperated switch all connected in series between a ground a power line. An input tone signal supplied to the gate of the FET is keyed to appear at the drain thereof. A capacitor is connected across the key-operated switch. Between the capacitor and the ground is connected another FET which is switched on and off by a rectangular wave having a supra-audible frequency and a variable duty factor thereby exhibiting a variable average resistance, determining a sustain time in cooperation with the capacitor.
摘要翻译： 在电子乐器中，维持键控电路包括全场串联连接在电源线之间的场效应晶体管，电阻器和按键操作开关。 提供给FET的栅极的输入音信号被键入以在其漏极处出现。 电容器连接在钥匙开关上。 在电容器和地之间连接另一个FET，其由具有超声频率和可变占空比的矩形波接通和断开，从而呈现可变平均电阻，确定与电容器配合的维持时间。
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公开(公告)号：US3655904A
公开(公告)日：1972-04-11
申请号：US3655904D
申请日：1970-12-14
申请人： HERBERT COHEN
发明人： COHEN HERBERT
摘要： An electric variable tone percussion instrument comprises a source of periodic signals, storage means coupled to the source of periodic signals, output means coupled to the storage means and switching means coupled to the storage means, the switching means normally being in a non-conducting state, the storage means being charged to a maximum storage voltage and the output means producing an minimum output voltage while the switching means is in the non-conducting state, the storage means discharging and the output means producing a maximum output voltage when the switching means is in a conducting state, the switching means immediately returning to the non-conducting state causing the storage means to charge towards the maximum storage voltage while the output means produces an exponentially decaying output voltage signal.
摘要翻译： 电动可变音乐打击乐器包括周期信号源，耦合到周期信号源的存储装置，耦合到存储装置的输出装置和耦合到存储装置的开关装置，开关装置通常处于非导通状态 所述存储装置被充电到最大存储电压，并且所述输出装置在所述开关装置处于非导通状态时产生最小输出电压，所述存储装置放电，并且所述输出装置在所述开关装置为 在导通状态下，开关装置立即返回到非导通状态，导致存储装置在最大存储电压下充电，同时输出装置产生指数衰减的输出电压信号。
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公开(公告)号：US3580980A
公开(公告)日：1971-05-25
申请号：US3580980D
申请日：1968-08-26
申请人： BALDWIN CO D H
发明人： UETRECHT DALE M
摘要： The keying networks between continuously running square wave tone signal sources and the sound output system of an electronic organ each consist of an isolating diode gate for each source, followed by the parallel combination of at least two keying diode gates of simplified circuitry which either gate-through the square wave signal without change in wave shape (for odd-orderharmonic tones) or gate-through and modify the wave-shape into sawtooths (for full harmonic tones). A keyed activating circuit for the isolating diode gate and the keying diode gates corresponding to a selected key may contain a single key switch connected to a source of direct current and a common R-C attack network for two adjacent footage keying diode gates as well as for the paralleled keying diode gates. A common coupler switch for coupling between keyboards is located between the direct current source and auxiliary key switches ganged respectively to the main key switches for a given manual, the auxiliary key switches being connected to a diode to isolate them from the main key switches in the coupled keyboard.
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公开(公告)号：US3564107A
公开(公告)日：1971-02-16
申请号：US3564107D
申请日：1970-02-16
发明人： FREEMAN ALFRED B
CPC分类号： G10H1/057
摘要： An apparatus is provided for producing a variable signal which utilizes a transistor, a capacitor connected between the base and the collector electrodes of the transistor, a first resistor connected in series with a switching means which are jointly connected between a first source of control potential and the base electrode, a second source of control potential connected via a second resistor to the base electrode, and means for developing an output signal at the collector electrode. By this circuit, when the switch means is closed, the rate of onset or attack of the output signal is linear, and when the switching means is opened, the rate of decay of the output signal is exponential.
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公开(公告)号：US3507973A
公开(公告)日：1970-04-21
申请号：US3507973D
申请日：1968-05-01
申请人： LEE DE PREE
发明人： PREE LEE DE
CPC分类号： G10H1/057
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公开(公告)号：US3484531A
公开(公告)日：1969-12-16
申请号：US3484531D
申请日：1966-03-10
申请人： GLENN A SCHMIDT
发明人： SCHMIDT GLENN A
CPC分类号： G10H1/057
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