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公开(公告)号：US3651242A
公开(公告)日：1972-03-21
申请号：US3651242D
申请日：1970-06-15
发明人： EVANS CHAUNCEY R
CPC分类号： G10H5/07
摘要： A bass or other guitar has a transducer for each of its strings, and each transducer is connected to an octave jumping circuit which lowers the musical tone produced by the individual string, all without loss of either harmonics or amplitude variations. The wave form of the fundamental frequency of each musical tone is squared, divided by two and then amplitude modulated to follow the amplitude envelope of the original tone. The modulated square wave contains only odd harmonics of the lowered frequency fundamental. The missing even harmonics are restored by combining with the modulated square wave the original tone containing all of its harmonics.
摘要翻译： 低音或其他吉他具有每个弦的换能器，并且每个换能器连接到八度跳跃电路，其降低由单个弦产生的乐音，全部不损失谐波或幅度变化。 每个音调基频的波形平方，除以2，然后进行幅度调制，以跟随原始音调的幅度包络。 调制方波仅包含降频频率基波的奇次谐波。 通过与被调制的方波组合包含其所有谐波的原始音调来恢复丢失的偶次谐波。
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公开(公告)号：US3637913A
公开(公告)日：1972-01-25
申请号：US3637913D
申请日：1970-07-27
发明人： EVANS CHAUNCEY R
CPC分类号： G10H1/06
摘要： A tone generator for an individual note of an electronic piano comprises an oscillator that provides an asymmetrical rectangular wave having a duty cycle of at least four to one. The rectangular wave is fed to a clipping diode gate where it is amplitude modulated in accordance with a signal envelope generated by the player of the piano. A capacitor is connected across the modulator output or, alternatively, connected within the modulator, to provide a modulated rectangular wave with a substantially sawtooth wave form. Other instrument sounds may be provided and a tone control is achieved by duty cycle variation. Performance of a power amplifier is enhanced by driving it with a rectangular wave.
摘要翻译： 一种用于电子钢琴个人音符的乐音发生器包括提供具有至少四比一的占空比的不对称矩形波的振荡器。 矩形波被馈送到限幅二极管门，其中它根据由钢琴演奏者产生的信号包络进行幅度调制。 电容器连接在调制器输出端上，或者连接在调制器内，以提供具有基本上锯齿波形的调制矩形波。
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