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US 3,930,430 AGranted
Photo-electric organ with chiff
AssigneeD. H. Baldwin Company
InventorsEdward M. Jones, William C. Wayne, Jr.
Life of this patent
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AssigneeD. H. Baldwin Company
InventorsEdward M. Jones, William C. Wayne, Jr.
Estimating the term…
An electrical organ in which each of the keys of the organ is mechanically coupled to one single pole single throw electrical switch, and a plurality of said switches are each connected to a plurality of photoelectric tone sources through pulse shaping keying circuits, the keying circuits connected to each key switch being connected in a cascade circuit with the direct current potential source and the photocell of one of the tone sources, the other tone sources having photocells connected to the junctions of keying circuits in said cascade circuit. The tone circuits actuated by a given key of the organ may be at the same frequency or may comprise a chiff tone component or a noise-puff component, or may include a special decay circuit which activates a photocell modulated at a different pitch from the main-tone component.
In an electronic musical instrument, a source of direct-current potential, a first keying circuit, a key switch connected between the source and the first keying circuit, a first tone signal source corresponding to the chiff component of a desired tone, a second keying circuit connected between the first keying circuit and the first tone signal source, a second tone signal source corresponding to the main component of a desired tone and a third keying circuit connected between the first keying circuit and the second tone signal source.
In an electronic musical instrument, a first tone signal source having a control terminal and producing an output modulated in amplitude by the amplitude of a potential impressed upon the control terminal thereof, a source of electrical pulses having a rising leading edge and decaying trailing edge connected to the control terminal of the first tone signal source, a transistor having a base, an emitter and a collector, a capacitor electrically connected between the control terminal of the first tone signal source and the base of the transistor, a source of direct-current potential having a first and a second terminal, a first resistor electrically connected between the first terminal of the source of direct-current potential and the emitter of the transistor, a second resistor electrically connected between the first terminal of the potential source and the base of the transistor, and a second tone signal source having a control terminal connected to the collector of the transistor, said second tone signal source producing an output modulated in amplitude by the amplitude of the potential impressed upon the control terminal and the pitch of the second tone-signal source being different from the pitch of the first tone-signal source.
In an electronic organ having a source of direct-current potential having a first terminal and a second terminal, a key switch having a first terminal connected to the first terminal of the source and a second terminal, a first resistor and a first capacitor connected in series between the second terminal of the key switch and the second terminal of the source, the combination comprising a first direct-current-actuable tone signal source, a first emitter follower having a first transistor having a base, an emitter and a collector, the base of the first transistor being connected to the junction between the first resistor and the first capacitor, a second emitter follower having a second transistor having a base, emitter and collector, a second resistor connected between the emitter of the first transistor and the base of the second transistor, a second capacitor connected between the base of the second transistor and the second terminal of the source, and the first tone signal source being connected to the emitter of the second transistor.
In an electronic organ having a source of direct-current potential having a first terminal and a second terminal, a key switch having a first terminal connected to the first terminal of the source and a second terminal, a first resistor and a first capacitor connected in series between the second terminal of the key switch and the second terminal of said source, the combination comprising a first emitter follower having a first transistor having a base, an emitter and a collector, the base of the first transistor being connected to the junction between the first resistor and the first capacitor, a second emitter follower having a second transistor having a base, an emitter and a collector, a second resistor connected between the emitter of the first transistor and the base of the second transistor, a second capacitor connected between the base of the second transistor and the, second terminal of the source, a first direct-current-actuable tone signal source connected to the emitter of the second transistor, a third emitter follower having a third transistor having a base, an emitter and a collector, a third capacitor connected between the emitter of the second transistor and the base of the third transistor, and a second direct-current-actuable tone signal source connected to the emitter of the third transistor.
An electrical musical instrument having a plurality of keys comprising a plurality of tone signal sources, each of the tone signal sources having a pair of control electrode terminals and producing a modulated output responsive to the magnitude of a potential impressed upon said control electrode terminals, an electrical key switch coupled to one of the keys of the musical instrument, said key switch being actuable in response to actuation of said key, a direct current source of potential, and a plurality of electrical envelope shapers, each having a pair of input terminals and a pair of output terminals and passive wave forming elements connected between the input and output terminals, said envelope shapers being connected in cascade with the input terminals of the first of said shapers connected in a series electrical circuit with the direct current source and the key switch, the output terminals of the last envelope shaper of said cascade being electrically connected to the control electrode terminals of one of the tone signal sources, whereby closing of the electrical switch impresses a potential on the one tone signal source modified by the cumulative effect of the waveform elements of the envelope shapers, and the pair of output terminals of the first of said envelope shapers being connected to the control electrode terminals of a different tone signal source, whereby closing of the electrical switch impresses a potential on said different tone signal source modified only by the waveforming elements of the first of said envelope shapers.
Dependencies are inferred from the claim text.