GB494688A - Improvements in or relating to the reduction of noise in radio receiving and similarapparatus - Google Patents
Improvements in or relating to the reduction of noise in radio receiving and similarapparatusInfo
- Publication number
- GB494688A GB494688A GB12260/37A GB1226037A GB494688A GB 494688 A GB494688 A GB 494688A GB 12260/37 A GB12260/37 A GB 12260/37A GB 1226037 A GB1226037 A GB 1226037A GB 494688 A GB494688 A GB 494688A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- impulses
- accentuated
- april
- reduction
- 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
- H03G11/004—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general using discharge tubes
Landscapes
- Noise Elimination (AREA)
Abstract
494,688. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 29, 1937, No. 12260. Convention date, April 29, 1936. [Class 40 (v)] For the reduction of interference noises in an audio-frequency amplifier the high frequency signal components are first accentuated, after which signals of above a predetermined amplitude are suppressed and finally the balance between high and low frequencies is restored. As shown the high frequency components of signals from an input stage 13 are accentuated by passing a capacity 14, the output from the next valve 15 consisting for each incoming impulse such as 11 of two oppositely directed impulses. If these impulses are above a predetermined amplitude one is absorbed by the shunt valve 30 normally biassed to cut-off and the other after phase reversal in the stage 19 is absorbed by the valve 37. The signal output is amplified by the valves 23, 27 between which is connected a network 24, 25, 26 which restores the balance of upper and lower frequencies. In another embodiment, Fig. 2 (not shown), a single limiting valve is used with a low anode voltage and suppresses noise impulses of opposite polarity by virtue of plate current cut-off and plate voltage saturation respectively.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US494688XA | 1936-04-29 | 1936-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB494688A true GB494688A (en) | 1938-10-31 |
Family
ID=21959983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12260/37A Expired GB494688A (en) | 1936-04-29 | 1937-04-29 | Improvements in or relating to the reduction of noise in radio receiving and similarapparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB494688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE940362C (en) * | 1941-05-01 | 1956-03-15 | Telefunken Gmbh | Arrangement for eliminating the inherent noise of a receiver containing an amplitude limiter for frequency-modulated oscillations in the absence of reception |
-
1937
- 1937-04-29 GB GB12260/37A patent/GB494688A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE940362C (en) * | 1941-05-01 | 1956-03-15 | Telefunken Gmbh | Arrangement for eliminating the inherent noise of a receiver containing an amplitude limiter for frequency-modulated oscillations in the absence of reception |
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