GB573168A - Improvements relating to apparatus for the reproduction of signals limited in frequency band-width before and/or on reception - Google Patents
Improvements relating to apparatus for the reproduction of signals limited in frequency band-width before and/or on receptionInfo
- Publication number
- GB573168A GB573168A GB2013843A GB2013843A GB573168A GB 573168 A GB573168 A GB 573168A GB 2013843 A GB2013843 A GB 2013843A GB 2013843 A GB2013843 A GB 2013843A GB 573168 A GB573168 A GB 573168A
- Authority
- GB
- United Kingdom
- Prior art keywords
- received
- harmonics
- band
- signals
- frequency band
- 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
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/04—Manually-operated control in untuned amplifiers
- H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
Landscapes
- Amplifiers (AREA)
Abstract
573,168. Valve amplifying circuits. FERRANTI, Ltd., and TAYLOR, M. K. Dec. 2,1943, No. 20138. [Class 40 (v)] In order to improve the quality of sound reproduction from signals received on a limited frequency band, second harmonics of the upper frequencies of the received band are produced and added to the received signals. As shown, the received signals are amplified in the resistance-capacity coupled valve stages 2, 29. Part of the output from the stage 2 is passed to a frequency-doubling pair of rectifiers 10, 12 through a T -section filter F<1> and transformer 6. The filter F<1> passes only the upper frequencies of the received band and the diodes are arranged to give a square-law output so that only second harmonics are produced across the load resistance 15. These pass through an amplifier 16 to a second T -section filter F<11> which removes all frequencies below the upper limit of the received band. The second harmonics remaining are fed into the grid circuit of the second amplifier stage 29. The diodes 10, 12 may be in one envelope with the triode 16, or with a pentode substituted therefor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2013843A GB573168A (en) | 1943-12-02 | 1943-12-02 | Improvements relating to apparatus for the reproduction of signals limited in frequency band-width before and/or on reception |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2013843A GB573168A (en) | 1943-12-02 | 1943-12-02 | Improvements relating to apparatus for the reproduction of signals limited in frequency band-width before and/or on reception |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB573168A true GB573168A (en) | 1945-11-08 |
Family
ID=10141002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2013843A Expired GB573168A (en) | 1943-12-02 | 1943-12-02 | Improvements relating to apparatus for the reproduction of signals limited in frequency band-width before and/or on reception |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB573168A (en) |
-
1943
- 1943-12-02 GB GB2013843A patent/GB573168A/en not_active Expired
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