US 3,939,750 A · Electronic organ

Abstract

An electronic organ comprises memory means for memorizing in an analog manner the synthesizing ratio of repetitively occuring waves such as square waves for synthesizing qualities of sound in response to the signals from means for selecting qualities of sound (to be referred to as tablets hereinafter); a mixing circuit for adding the synthesizing ratio for each repetitively occuring wave when the means for selecting qualities of sound are selected; frequency dividers for dividing the oscillation frequencies of top octave generators, an indirect keying circuit for interrupting the current corresponding to the ratio of repetitively occuring waves in response to the repetitively occuring signal waveforms from the frequency dividers and intermittingly interrupting said current in response to on-off signals from a keyboard; a synthesizing circuit for combining the outputs from the indirect keying circuit into a group for each octave; a variable filter for changing the frequency characteristics electronically in response to the outputs from said tablets; and detectors of key number and tablet number for detecting the number of keys pressed and the number of tablets selected, respectively, for effecting the additive control of the amplitudes of the output tone signals.

Claims18

Dependent claims

An electronic organ comprising

a. a reference voltage source,
b. at least one group of tablets for selectively passing the current from said reference source,
c. at least one group of memory means for separating the current which has passed through each of said tablets into a plurality of currents each with a predetermined different magnitude with respect to each other,
d. at least one group of first means for mixing selected currents from said memory means,
e. means for generating top octave waves,
f. a plurality of groups of means for dividing stepwise the frequency of the waves of each interval of said top octave waves,
g. a DC voltage source,
h. at least one keyboard consisting of keys for selectively passing the voltage from said DC voltage source,
i. a plurality of indirect keying means each for modulating the current from each of said mixing means by the frequency-divided waves and selectively passing the modulated waves in response to the operation of each of said keys of said keyboard, and
j. at least one means for converting the waves of said indirect keying means into the musical sounds.

7 more elements

An electronic organ comprising

a. a reference voltage source,
b. at least one group of tablets for selectively passing the current from said reference source,
c. at least one group of memory means for separating the current which has passed through each of said tablets into a plurality of currents each with a predetermined different magnitude,
d. at least one group of first means for mixing selected currents from said memory means,
e. means for generating top octave waves,
f. a plurality of groups of means for dividing stepwise the frequency of the waves of each interval of said top octave waves,
g. a DC voltage source,
h. at least one keyboard consisting of keys for selectively passing the voltage from said DC voltage source,
i. a plurality of indirect keying means each for modulating the current from each of said mixing means by the frequency-divided waves and selectively passing the modulated waves in response to the operation of each of said keys, and
j. at least one means for converting the waves from said indirect keying means into the musical sounds;
k. at least one group of second mixing circuits inserted between said indirect keying means and said means for converting the waves from said indirect keying means into the musical sounds for mixing the modulated waves from said indirect keying means for each octave,
l. at least one group of variable filter means inserted between said second mixing circuits and said means for converting the waves from said indirect keying means into the musical sounds for transmitting only the desired higher harmonics of the mixed modulated waves in response to the selection of said tablets;
and at least one filter control circuit for controlling said variable filter means in response to the selection of said tablets,
m. at least one effect circuit means inserted between said group of said variable filter means and said means for converting the waves into the musical sounds,
n. tablet number detecting means for controlling said reference voltage source in response to the number of selected tablets,
o. key number detecting means for controlling said reference voltage in response to the number of pressed keys;
and
p. an envelop control device inserted between a connection of said keys and said indirect keying means and the ground.

15 more elements

Dependencies are inferred from the claim text.

Electronic organ

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Electronic organ

Life of this patent

Abstract

Claims18