Patent US3766431A successfully refreshed from Google Patents.
US3766431A
Expired / Lapsed
US
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A lighting control system including an analogue to digital converter
Assignee: EMI Group Ltd
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Filing: 1971-05-19
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Granted: 1973-10-16
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Expires: 1991-05-19
Abstract
Abstract A lighting control system for stage and studio lighting applications wherein the system includes a digital to analogue converter connected to a digital store, a second store containing brightness control information for a plurality of lamps and an analogue to digital converter connected to the digital store for providing thereto a cyclic series of discrete signals of differing constant magnitudes.
Inventors
- 👤 A Isaacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:32
CPC Classifications
H; H05; H05B; H05B47/00; H05B47/10; H05B47/155
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A lighting control system comprising a digital store, means for reading out a number stored in said store, a digital to analogue converter connected to said store by way of said read-out means, means coupled to the output of said converter for controlling the brightness of a lamp in accordance with an analogue signal received from said converter, means for supplying pulses to the store to change the number stored, and means for varying the rate of supply of said pulses.
Claim 2
Dependent Claim
81 words
A lighting control system comprising a digital store, means for reading out a number stored in said store, a digital to analogue converter connected to said store by way of said read-out means, means coupled to the output of said converter for controlling the brightness of a lamp in accordance with an analogue signal received from said converter, means for supplying pulses to the store to change the number stored, and means for varying the rate of supply of said pulses.
Claim 3
Dependent Claim
53 words
A system according to claim 1 further including a second store containing brightness control information for a plurality of lamps, said first-mentioned store forming a buffer store coupled to said second store, and means for reading out the said information from said second store into said buffer store for each lamp in turn.
Claim 4
Dependent Claim
66 words
A system according to claim 2 in which the means for controlling lamp brightness includes a number of dimmers and dimmer drive circuits individual to each of a plurality of lamps and means for selecting the dimmer drive circuit controlling a given lamp and coupling it to the digital to analogue converter when the count in the buffer store is that pertaining to the given lamp.
Claim 5
Dependent Claim
66 words
A system according to claim 2 in which said means for changing the number stored includes a plurality of faders, an analogue to digital converter coupled to the buffer store, and a selection circuit coupled between said faders and said converter to select the fader required to control the lamp for which said brightness control information is at a given time held in said buffer store.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |