GB502098A - Improvements in and relating to picture transmission, television and the like - Google Patents
Improvements in and relating to picture transmission, television and the likeInfo
- Publication number
- GB502098A GB502098A GB2472237A GB2472237A GB502098A GB 502098 A GB502098 A GB 502098A GB 2472237 A GB2472237 A GB 2472237A GB 2472237 A GB2472237 A GB 2472237A GB 502098 A GB502098 A GB 502098A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- normal
- carrier
- television
- reversed
- 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
- H04N5/14—Picture signal circuitry for video frequency region
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
- H03C1/56—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only
- H03C1/58—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising variable two-pole elements only comprising diodes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Closed-Circuit Television Systems (AREA)
- Television Systems (AREA)
Abstract
502,098. Television. STANDARD TELEPHONES & CABLES, Ltd., and TERRY V. J. Sept. 10, 1937, No. 24722. [Class 40 (iii)] The direct current components are reduced by subjecting the signals to repeated reversal, preferably at the end of each line. Thus, the normal television signal A, Fig. 1, becomes the signal B. The normal signal A is applied at LL, Fig. 3, and a square-topped wave of half the line frequency is applied over transformer T1 to a diagonal of the " ring " modulator M, the repeatedly reversed signal B occurring at T2. The normal signal A can be obtained by rectifying the signal B. Preferably, the signal B is modulated on a carrier wave, and the carrier frequency is suppressed, so that the envelope is that of the normal signal modulated on a carrier whose phase is reversed at the end of each line. This carrier can be demodulated by a synchronized oscillator and the signal B obtained. If a picture signal without synchronizing signals is subject to reversals that are not instantaneous, the reversed signal when rectified will comprise blacker-than-blaok peaks at the reversal points, and these may be used as synchronizing signals..
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL67472D NL67472C (en) | 1937-09-10 | ||
| GB2472237A GB502098A (en) | 1937-09-10 | 1937-09-10 | Improvements in and relating to picture transmission, television and the like |
| FR843210D FR843210A (en) | 1937-09-10 | 1938-09-09 | Image, television and analog transmission systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2472237A GB502098A (en) | 1937-09-10 | 1937-09-10 | Improvements in and relating to picture transmission, television and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB502098A true GB502098A (en) | 1939-03-10 |
Family
ID=10216227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2472237A Expired GB502098A (en) | 1937-09-10 | 1937-09-10 | Improvements in and relating to picture transmission, television and the like |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR843210A (en) |
| GB (1) | GB502098A (en) |
| NL (1) | NL67472C (en) |
-
0
- NL NL67472D patent/NL67472C/xx active
-
1937
- 1937-09-10 GB GB2472237A patent/GB502098A/en not_active Expired
-
1938
- 1938-09-09 FR FR843210D patent/FR843210A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL67472C (en) | |
| FR843210A (en) | 1939-06-28 |
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