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US3940678A
Expired / Lapsed
US
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Multi-input switching means
Assignee: Azbil Corp
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Filing: 1974-12-31
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Granted: 1976-02-24
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Expires: 1994-12-31
Abstract
Abstract A multiple input switching system includes an input isolation device, such as a transformer, in the input circuit. Switching devices are provided for sequentially connecting the several input circuits to a time-shared amplifier. The switching devices are actuated at a predetermined rate with a predetermined closed-time for each closure. Further switching devices are provided for transferring the data from each of the input circuits to a corresponding memory device. These further switching devices are operated synchronously with the first-mentioned switching devices but with a shorter close-time. The data values in the several memory devices may be selectively scanned asynchronously. Between each actuation of the input switching devices, additional switches are actuated which (1) short-circuits the input to the amplifier and (2) applies the output drift signal of the amplifier to a compensating storage capacitor. On subsequent actuation of the input and output switch devices, the compensating signal is superimposed on the data signal stored on the corresponding memory device.
Inventors
- 👤 Hiroshi Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:46
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303; G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/401; G11C11/4063; G11C11/407; G11C11/409; G11C11/4096; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/047
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
A multiplexing switching system comprising a plurality of signal input channels; a plurality of reactive isolating means; a plurality of multiplex switch members connected, respectively, between said input channels and said reactive isolating means; means for actuating said multiplex switch means sequentially at a predetermined rate with a predetermined close-time for each actuation of each of said switch members; a plurality of data storage devices; a plurality of commutating switch members connected, respectively, between said reactive isolating means and said data storage devices; means for actuating said commutating switch members synchronously with respect to said multiplex switch members but with a predetermined close-time which is less than the close-time of said multiplex switch members; an output circuit; a plurality of read-out scanning switch members connected, respectively, between said data storage devices and said output circuit; and means for actuating said read-out scanning switches asynchronously with respect to said multiplexing switch members.
Claim 2
Dependent Claim
151 words
A multiplexing switching system comprising a plurality of signal input channels; a plurality of reactive isolating means; a plurality of multiplex switch members connected, respectively, between said input channels and said reactive isolating means; means for actuating said multiplex switch means sequentially at a predetermined rate with a predetermined close-time for each actuation of each of said switch members; a plurality of data storage devices; a plurality of commutating switch members connected, respectively, between said reactive isolating means and said data storage devices; means for actuating said commutating switch members synchronously with respect to said multiplex switch members but with a predetermined close-time which is less than the close-time of said multiplex switch members; an output circuit; a plurality of read-out scanning switch members connected, respectively, between said data storage devices and said output circuit; and means for actuating said read-out scanning switches asynchronously with respect to said multiplexing switch members.
Claim 3
Dependent Claim
27 words
The multiplexing switching system as set forth in claim 1 and further including a time-shared amplifier connected between said read-out scanning switch members and said output circuit.
Claim 4
Dependent Claim
18 words
The multiplexing switching system as set forth in claim 1 wherein said reactive isolating means comprise flying capacitors.
Claim 5
Dependent Claim
17 words
The multiplexing switching system as set forth in claim 1 wherein said reactive isolating means comprise transformers.
Claim 6
Dependent Claim
27 words
The multiplexing switching system as set forth in claim 4 and further including a time-shared amplifier connected between said reactive isolating means and said commutating switch members.
Claim 7
Dependent Claim
71 words
The multiplexing switching system as set forth in claim 5 wherein said multiplex switch members comprise a first plurality of switch elements connected, respectively, between said input channels and primary winding means on said transformers, and a second plurality of switch elements connected, respectively, between said secondary winding means on said transformers and said amplifier, said first and second plurality of switch elements being synchronously driven with respect to each other.
Claim 8
Dependent Claim
99 words
The multiplexing switching system as set forth in claim 6 and further including drift and offset compensating means for said amplifier, said compensating means comprising a first compensation switch member connected between the input of said amplifier and ground, a compensation signal storage capacitor, a second compensation switch member connected between the output of said amplifier and said capacitor, means for actuating said compensation switch members in the interval between successive actuations of said multiplex and commutating switch elements, and means for superimposing the compensation signal stored on said storage capacitor on output signals of said multiplexing switching system.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |