GB572731A - Improvements in electrical calculators - Google Patents
Improvements in electrical calculatorsInfo
- Publication number
- GB572731A GB572731A GB1270741A GB1270741A GB572731A GB 572731 A GB572731 A GB 572731A GB 1270741 A GB1270741 A GB 1270741A GB 1270741 A GB1270741 A GB 1270741A GB 572731 A GB572731 A GB 572731A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terminals
- amplifiers
- output
- amplifier
- proportional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
- G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division
- G06G7/163—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division using a variable impedance controlled by one of the input signals, variable amplification or transfer function
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
572,731. Electric control systems. GENERAL ELECTRIC CO., Ltd., SNOW, P. E. ACKLAND-, FARREN, I. L., and RIVLIN, R. S. Oct. 1, 1941, No. 12707. [Class 40 (i)] [Also in Group XIX] An electrical apparatus for obtaining the quotient of two given quantities a, b comprises means for applying an input to terminals (A) proportional to a, means for varying the transmission ratio between the terminals (A) and other terminals (C) in such manner that the output at terminals (C) is constant whatever the value of a, means for applying to terminals (B) an input proportional to b, and means for causing the transmission ratio between terminals (B) and other terminals (D) to vary concurrently with and proportional to the first transmission ratio thereby obtaining an output at terminals (D) proportional to the ratio b/a, the transfer paths between the terminals A and C and B and D, comprising thermionic valve amplifiers. In the embodiment shown 1 and 2 are similar valve amplifiers, 3 and 4 are another pair of similar valve amplifiers. Amplifiers 1 and 3, and 2 and 4, are connected by leads 5 and 6. The output of amplifier 1 feeds a rectifier 7, the smoothed output of which is applied as a bias to a valve in each of the four amplifiers. The biases are adjusted in such manner that whatever the value a assumes, within some determinate range, the output of amplifier 3 has a constant value k. Means to this end have been used in automatic volume control apparatus. As the gain in the circuit of the amplifiers 2 and 4 is the same as that in the circuit of amplifiers 1 and 3 the output at amplifier 4 is b equal to k-, a and b being alternating voltages a applied to the amplifiers 1 and 2. Instead of two pairs of amplifiers one pair, viz. 1 and 3, may be employed, voltages a and b being applied to the input terminals at different frequencies fa and fb. The rectifier 7 is then fed at the frequency fa by means of a filter and the output of amplifier 3 is divided into two parts by filters. The part with the frequency fa is observed and the biases adjusted so that this part is independent of the value a. In another modification (not shown) two similar potentiometers with sliders ganged mechanically may be employed. The output of the first potentiometer is kept constant as indicated by an appropriate instrument either controlled manually or by known automatic means ; the output of the second potentiometer will give the desired ratio of the two inputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1270741A GB572731A (en) | 1941-10-01 | 1941-10-01 | Improvements in electrical calculators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1270741A GB572731A (en) | 1941-10-01 | 1941-10-01 | Improvements in electrical calculators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB572731A true GB572731A (en) | 1945-10-22 |
Family
ID=10009636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1270741A Expired GB572731A (en) | 1941-10-01 | 1941-10-01 | Improvements in electrical calculators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB572731A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3009641A (en) * | 1956-10-29 | 1961-11-21 | Curtis V Hinton | Variable voltage multiplier |
| GB2187581B (en) * | 1985-04-10 | 1989-06-21 | Matsushita Electric Ind Co Ltd | Control circuit |
-
1941
- 1941-10-01 GB GB1270741A patent/GB572731A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3009641A (en) * | 1956-10-29 | 1961-11-21 | Curtis V Hinton | Variable voltage multiplier |
| GB2187581B (en) * | 1985-04-10 | 1989-06-21 | Matsushita Electric Ind Co Ltd | Control circuit |
| US4951273A (en) * | 1985-04-10 | 1990-08-21 | Matsushita Electric Industrial Co., Ltd. | Optical recording and reproducing device with normalization of servo control signal using switchable automatic gain control circuitry |
| DE3690169C2 (en) * | 1985-04-10 | 1990-10-04 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka, Jp |
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