US3660587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic organ keying circuits
Assignee: Baldwin Piano and Organ Co
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Filing: 1970-03-23
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Granted: 1972-05-02
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Expires: 1990-03-23
Abstract
Abstract In a keyed-photocell type electronic organ, two or more photocells are keyed with a single, make-brake switch via two or more respective RC keying circuits having onset and/or decay times corresponding to the tone colors and/or pitches desired. Each keying circuit may control both a first photocell corresponding to a relatively low-pitched, fast-starting tone and a second photocell corresponding to a relatively high-pitched, slow-starting tone.
Inventors
- 👤 Daniel W Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:48
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
273 words
A photoelectric organ, said organ including a stationary array of photoelectric cells each pertaining to a different tone timbre and tone pitch, said tone pitches being octavely related, a scanning tone disc having recurrent circles of transparent slots spaced for separate radii of said discs to provide different tone pitches at different radii, a stationary timbre disc located between said scanning tone disc and said array of photocells and having a circle of timbre producing transparencies located between each circle of slots of said scanning tone disc and a photocell of said array of photocells such that light passing from any circle of slots will pass through a circle of timbre producing transparencies and fall ultimately on one of said photocells as said tone disc scans, each of said photocells including two collecting electrodes separated from a keying electrode by a layer of photoresistive material, a center grounded primary winding connected across each two collecting electrodes of each photocell, a separate secondary winding coupled to each of said primary windings, output bus means, and tab switches connecting said secondary windings to said output bus means, and a loud speaker separately coupled to said output bus means, a key switch, a voltage supply, a keying lead, means connecting said key switch to convey voltage from said voltage supply to said keying lead, plural diverse RC tone envelope control circuits connected in parallel with each other to said keying lead; and means connecting said envelope control circuits each to plural ones of said keying electrodes, said RC tone envelope control circuits having diverse attack and decay rates appropriate to diverse timbres of a pipe organ.
Claim 2
Dependent Claim
273 words
A photoelectric organ, said organ including a stationary array of photoelectric cells each pertaining to a different tone timbre and tone pitch, said tone pitches being octavely related, a scanning tone disc having recurrent circles of transparent slots spaced for separate radii of said discs to provide different tone pitches at different radii, a stationary timbre disc located between said scanning tone disc and said array of photocells and having a circle of timbre producing transparencies located between each circle of slots of said scanning tone disc and a photocell of said array of photocells such that light passing from any circle of slots will pass through a circle of timbre producing transparencies and fall ultimately on one of said photocells as said tone disc scans, each of said photocells including two collecting electrodes separated from a keying electrode by a layer of photoresistive material, a center grounded primary winding connected across each two collecting electrodes of each photocell, a separate secondary winding coupled to each of said primary windings, output bus means, and tab switches connecting said secondary windings to said output bus means, and a loud speaker separately coupled to said output bus means, a key switch, a voltage supply, a keying lead, means connecting said key switch to convey voltage from said voltage supply to said keying lead, plural diverse RC tone envelope control circuits connected in parallel with each other to said keying lead; and means connecting said envelope control circuits each to plural ones of said keying electrodes, said RC tone envelope control circuits having diverse attack and decay rates appropriate to diverse timbres of a pipe organ.
Claim 3
Dependent Claim
75 words
The combination according to claim 1, wherein said RC tone envelope control circuits are three, a first sufficiently slow to be appropriate to an 8 ft flute tone, another sufficiently fast to be appropriate to a 1 ft flute tone and a reed tone, said tones being of pitches which are octavely related, and a third having sufficiently fast rise and an immediately following decay to be appropriate to a chiff component of a tone.
Claim 4
Dependent Claim
73 words
The combination according to claim 2, wherein said first RC tone envelope control circuit is connected to control a 16 ft Bourdon, an 8 ft flute, a 4 ft flute tone, wherein said another RC tone envelope control circuit is connected to control a 2 ft flute, a 1 ft flute and a 4 ft reed tone, all said tones being of pitches which are octavely related and an 8 ft reed tone.
Claim 5
Dependent Claim
179 words
In a photoelectric organ, a plurality of photoelectronic tone sources grouped to include in one group a 2 ft flute, a 1 ft flute, and a 4 ft reed, and an 8 ft reed of a given common nomenclature, in a second group a 4 ft flute, an 8 ft flute and a 16 ft Bourdon of said given common nomenclature, in a third group a chiff generator of pitch appropriate to the tones of said first and second groups, a slow keying circuit common to said first group and having an attack and decay time appropriate to the tone generators of said first group, a fast keying circuit common to said second group and having an attack and decay time appropriate to the tone generators of said second group, and chiff keying circuit having attack and decay times appropriate to chiff components of said first and second groups of tones, a single key operated means for commonly energizing all said keying circuits, and separate tab switches connected between each of said toNe sources and a common output load.
Claim 6
Dependent Claim
179 words
In a photoelectric organ, a plurality of photoelectronic tone sources grouped to include in one group a 2 ft flute, a 1 ft flute, and a 4 ft reed, and an 8 ft reed of a given common nomenclature, in a second group a 4 ft flute, an 8 ft flute and a 16 ft Bourdon of said given common nomenclature, in a third group a chiff generator of pitch appropriate to the tones of said first and second groups, a slow keying circuit common to said first group and having an attack and decay time appropriate to the tone generators of said first group, a fast keying circuit common to said second group and having an attack and decay time appropriate to the tone generators of said second group, and chiff keying circuit having attack and decay times appropriate to chiff components of said first and second groups of tones, a single key operated means for commonly energizing all said keying circuits, and separate tab switches connected between each of said toNe sources and a common output load.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |