GB498037A - Improvements in or relating to high frequency signalling systems - Google Patents
Improvements in or relating to high frequency signalling systemsInfo
- Publication number
- GB498037A GB498037A GB1754237A GB1754237A GB498037A GB 498037 A GB498037 A GB 498037A GB 1754237 A GB1754237 A GB 1754237A GB 1754237 A GB1754237 A GB 1754237A GB 498037 A GB498037 A GB 498037A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- characteristic
- modulation frequency
- highest modulation
- frequency
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/4446—IF amplifier circuits specially adapted for B&W TV
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
498,037. Valve circuits for wireless reception. FERRANTI, Ltd., and TAYLOR, M. K. June 24,1937, No. 17542. [Class 40 (v)] A high-frequency amplifier in which one side-band is partially suppressed, particularly for a television receiver, is designed to have an unsymmetrical substantially-triangular characteristic as shown, for example in Fig. 3, the highest modulation frequency to be reproduced corresponding to the apex a of the triangle and .the carrier corresponding to a point b on the more-gradually sloping side at which the amplification is between one-fifth and onethird of that at a. This arrangement compensates for the absence of part of one sideband and also for loss of response at high frequencies at other points in the system. In the intermediate-frequency amplifier shown in Fig. 1, the desired characteristic is obtained by the inductively-coupled circuits 8, 13, 14 ; 10, 15, 16 winch are each tuned to the highest modulation frequency and are given different decrements. In a modification, Fig. 2 (not shown), the circuit 8 ... 16 has a substantiallyuniform band-pass characteristic, but this is modified by the inclusion in the cathode lead of a circuit tuned to the highest modulation frequency. In a multi-stage amplifier, the required characteristic may be produced for the amplifier as a. whole or for each stage separately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1754237A GB498037A (en) | 1937-06-24 | 1937-06-24 | Improvements in or relating to high frequency signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1754237A GB498037A (en) | 1937-06-24 | 1937-06-24 | Improvements in or relating to high frequency signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB498037A true GB498037A (en) | 1938-12-28 |
Family
ID=10096999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1754237A Expired GB498037A (en) | 1937-06-24 | 1937-06-24 | Improvements in or relating to high frequency signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB498037A (en) |
-
1937
- 1937-06-24 GB GB1754237A patent/GB498037A/en not_active Expired
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