GB518433A - Improvements in and relating to noise limiting circuits for communication or control systems - Google Patents
Improvements in and relating to noise limiting circuits for communication or control systemsInfo
- Publication number
- GB518433A GB518433A GB2511338A GB2511338A GB518433A GB 518433 A GB518433 A GB 518433A GB 2511338 A GB2511338 A GB 2511338A GB 2511338 A GB2511338 A GB 2511338A GB 518433 A GB518433 A GB 518433A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cut
- signal
- diodes
- constant
- frequencies
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes
Landscapes
- Noise Elimination (AREA)
Abstract
518,433. Wireless receiving systems. THORNTON. A. A. (Philco Radio & Television Corporation). Aug. 26, 1938, No. 25113. [Class 40 (v)] A noise-limiting circuit is so arranged that the amplitude of the noise pulse required to cut-off transmission is a function of the signal frequency. Reversely-connected diodes D1, D2 are in series in the path from the signal source E to utilization means 3. A constant-current bias is applied to the diodes by a degenerative pentode V1 so that for signal amplitudes above a desired value in either direction the current through one diode is reduced to zero and the signal transference is cut off. By making the resistances 11, 12 unequal, a cut-off characteristic which is unsymmetrical about the zero axis can be secured. If one diode is removed, then limitation occurs in one direction only. The cut-off level is reduced at higher signal frequencies by the network R1, C which increases the signal-current flowing through the diodes at these frequencies. Attenuation of the higher frequencies is prevented by the use of circuit R, L, which together with R1, C, forms a constant-resistance network. Any derived characteristic of cut-off amplitude against frequency may be obtained by using suitable frequency-selective networks. The limiter may be made to operate over a wide range of s.gnal strength by varying the constant-current bias on the diodes by A.V.C. potentials from 15 applied to the first grid of V1 at terminals 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2511338A GB518433A (en) | 1938-08-26 | 1938-08-26 | Improvements in and relating to noise limiting circuits for communication or control systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2511338A GB518433A (en) | 1938-08-26 | 1938-08-26 | Improvements in and relating to noise limiting circuits for communication or control systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB518433A true GB518433A (en) | 1940-02-27 |
Family
ID=10222417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2511338A Expired GB518433A (en) | 1938-08-26 | 1938-08-26 | Improvements in and relating to noise limiting circuits for communication or control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB518433A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE873568C (en) * | 1950-03-01 | 1953-04-16 | Philips Nv | Circuit arrangement for reducing impulse interference in radio receivers |
-
1938
- 1938-08-26 GB GB2511338A patent/GB518433A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE873568C (en) * | 1950-03-01 | 1953-04-16 | Philips Nv | Circuit arrangement for reducing impulse interference in radio receivers |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB480289A (en) | Improvements relating to wireless telegraph systems | |
| US2281395A (en) | Noise limiting circuits | |
| GB587941A (en) | Improvements relating to multi-channel electrical pulse communication systems | |
| US2301373A (en) | Multichannel telegraph system | |
| GB603437A (en) | Improvements in or relating to frequency discriminator circuits | |
| GB518433A (en) | Improvements in and relating to noise limiting circuits for communication or control systems | |
| US2273639A (en) | Selectivity control circuit | |
| US2215482A (en) | Carrier wave telephony | |
| US2821629A (en) | Limiter circuit | |
| US2414440A (en) | Voice frequency ringer | |
| US3225348A (en) | Transmitter having an oscillator controlled by selectively switched capacitors | |
| US2215483A (en) | Carrier wave telephony system | |
| US2662174A (en) | Amplitude discriminating noise reducing means | |
| US2411415A (en) | Telecommunication system | |
| US2271078A (en) | Modulating system | |
| US2393645A (en) | Switching system | |
| US2806136A (en) | Controlled modulation circuit | |
| US2255479A (en) | Automatic level control decoupler | |
| GB1282744A (en) | Improvements in or relating to data sets employing active filters | |
| GB631377A (en) | Improvements in or relating to radio receivers | |
| GB556001A (en) | Improvements relating to electrical communication systems | |
| SU66585A1 (en) | Device for multichannel telegraph transmission | |
| US2043355A (en) | Carrier telegraph receiver | |
| GB626595A (en) | Improvements in or relating to frequency modulation systems | |
| GB533812A (en) | Improvements in or relating to interference suppressors for radio receivers |