GB430161A - Improvements in or relating to television systems - Google Patents
Improvements in or relating to television systemsInfo
- Publication number
- GB430161A GB430161A GB34301/33A GB3430133A GB430161A GB 430161 A GB430161 A GB 430161A GB 34301/33 A GB34301/33 A GB 34301/33A GB 3430133 A GB3430133 A GB 3430133A GB 430161 A GB430161 A GB 430161A
- Authority
- GB
- United Kingdom
- Prior art keywords
- harmonics
- band
- television
- square
- fundamental
- 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
- 230000010355 oscillation Effects 0.000 abstract 3
- 238000012887 quadratic function Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
- H04N7/127—Systems in which different parts of the picture signal frequency band are individually processed, e.g. suppressed, transposed
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Television Systems (AREA)
Abstract
430,161. Television. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, DOWSETT, H. M., 47, Drayton Gardens, Winchmore Hill, and WALKER, L. E. Q., 98, Wymering Mansions, Maida Vale, all in London. Dec. 6, 1933, No. 34301. [Class 40 (iii)] The band-width in television-transmission is reduced by heterodyning the picture signals (consisting mainly of the line frequency and its harmonics) with an oscillation rich in harmonics and of slightly different frequency. The resulting frequency band comprises a fundamental and harmonics equal to the difference frequencies, the highest of which is arranged to be less than the fundamental line frequency. At the transmitter the picture signals and the local oscillation and harmonics are passed through a square-law rectifier or demodulator (i.e. one whose output current is a quadratic function of the input voltage) which yields the required narrow band of frequencies. At the receiving station this band is heterodyned with a local oscillation of suitable wave-form by means of a detector having a square-root law. The signals are thus translated back into their original form.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB34301/33A GB430161A (en) | 1933-12-06 | 1933-12-06 | Improvements in or relating to television systems |
| US756293A US2146804A (en) | 1933-12-06 | 1934-12-06 | Television system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB34301/33A GB430161A (en) | 1933-12-06 | 1933-12-06 | Improvements in or relating to television systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB430161A true GB430161A (en) | 1935-06-06 |
Family
ID=10363915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34301/33A Expired GB430161A (en) | 1933-12-06 | 1933-12-06 | Improvements in or relating to television systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2146804A (en) |
| GB (1) | GB430161A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3259690A (en) * | 1961-09-11 | 1966-07-05 | Kokusai Denshin Denwa Co Ltd | Coding system for television signals |
-
1933
- 1933-12-06 GB GB34301/33A patent/GB430161A/en not_active Expired
-
1934
- 1934-12-06 US US756293A patent/US2146804A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2146804A (en) | 1939-02-14 |
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