公开(公告)号：US4282787A

公开(公告)日：1981-08-11

申请号：US122340

申请日：1980-02-19

申请人： Richard M. Walborn

发明人： Richard M. Walborn

IPC分类号： G10H5/00 ,  G10H1/00

CPC分类号： G10H5/002 ,  Y10S84/20

摘要： An electronic musical instrument having combined monophonic and polyphonic sound producing capabilities includes a keyboard simultaneously operating a monophonic tone signal generating circuit and a polyphonic tone signal generating circuit. The tone signals produced by the tone generating circuits are combined and coupled through a single signal processing stage and therefrom to an output speaker. A gate signal for enabling the monophonic tone signal generating circuit and for operating the signal processing stage is derived at the output of a detector circuit which is responsive to the presence of an audio output from the polyphonic tone signal generating circuit.

摘要翻译： 具有组合的单音和复音产生能力的电子乐器包括同时操作单声道音调信号发生电路和复音音调信号发生电路的键盘。 由音调发生电路产生的音调信号通过单个信号处理阶段组合并耦合到输出扬声器。 在响应于来自多音调音调信号发生电路的音频输出的检测器电路的输出端导出用于启用单音调信号产生电路和用于操作信号处理级的门信号。

公开(公告)号：US4166197A

公开(公告)日：1979-08-28

申请号：US891694

申请日：1978-03-30

申请人： Robert A. Moog ,  Richard M. Walborn

发明人： Robert A. Moog ,  Richard M. Walborn

IPC分类号： H03G5/02 ,  H03H7/16

CPC分类号： H03G5/025

摘要： An improved frequency sensitive circuit capable of adjusting one or more of its parameters in order to shunt an adjustable amount of electrical signal to a current sink, thereby controlling the amplitude of the signal. The frequency sensitive circuit is connected to the wiper of a potentiometer that is placed across the inputs of a difference amplifier in order to control the peak value of the cut or boost in the signal. The frequency sensitive circuit includes a shunt impedance connected between the wiper of the potentiometer and the current sink. A resonant circuit is connected to the impedance and is tuned to an adjustable resonant frequency. A compensation circuit, such as a difference amplifier referenced to the wiper, couples the output of the resonant circuit to the shunt impedance so that the impedance of the frequency sensitive circuit approaches infinity as the frequency of the electrical signal is displaced from the resonant frequency. As a result, the frequency sensitive circuit has substantially no effect on the overall amplitude of the electrical signal at frequencies widely displaced from the resonant frequency.