GB649793A - Improvements relating to variable gain amplifiers - Google Patents
Improvements relating to variable gain amplifiersInfo
- Publication number
- GB649793A GB649793A GB11313/48A GB1131348A GB649793A GB 649793 A GB649793 A GB 649793A GB 11313/48 A GB11313/48 A GB 11313/48A GB 1131348 A GB1131348 A GB 1131348A GB 649793 A GB649793 A GB 649793A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- impedance
- variable gain
- dependence
- condenser
- 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
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/202—Gamma control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
649,793. Non-linear valve circuits. ELECTRIC & MUSICAL INDUSTRIES, Ltd. April 24, 1948, No. 11313. [Class 40 (vi)] In a variable gain amplifier of the kind described in Specification 497,060, having an impedance which varies in dependence upon a characteristic of the input signals, and thus varies the gain in dependence upon this characteristic, and in which reactance shunting this impedance produces undesirable modification of the frequency response, a further reactance is added to compensate these undesirable changes. As shown, input signals from a source 3 are amplified by a valve 1 and an output is obtained between terminal 11 and earth. A second valve 2 passes between a conducting and a non-conducting state when the amplitude of the input passes through a certain value and alters the impedance in the cathode circuit of valve 1. The cathode to ground capacity of the valves indicated by condenser 20 affects the frequency response and is compensated by the insertion of condenser 12 as shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB11313/48A GB649793A (en) | 1948-04-24 | 1948-04-24 | Improvements relating to variable gain amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB11313/48A GB649793A (en) | 1948-04-24 | 1948-04-24 | Improvements relating to variable gain amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB649793A true GB649793A (en) | 1951-01-31 |
Family
ID=9983954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11313/48A Expired GB649793A (en) | 1948-04-24 | 1948-04-24 | Improvements relating to variable gain amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB649793A (en) |
-
1948
- 1948-04-24 GB GB11313/48A patent/GB649793A/en not_active Expired
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