JPS5797277A - Television video audio simultaneous transmitter - Google Patents
Television video audio simultaneous transmitterInfo
- Publication number
- JPS5797277A JPS5797277A JP17413280A JP17413280A JPS5797277A JP S5797277 A JPS5797277 A JP S5797277A JP 17413280 A JP17413280 A JP 17413280A JP 17413280 A JP17413280 A JP 17413280A JP S5797277 A JPS5797277 A JP S5797277A
- Authority
- JP
- Japan
- Prior art keywords
- waveform
- circuit
- video signal
- band
- distortion
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To reduce distortion and noise due to band limit of an FM wave, by synthesizing modulated audio subcarriers, after a video signal passes through an amplitude limit circuit so as not to prevent an instantaneous amplitude of the video signal through a pre-emphasis circuit from exceeding a prescribed value or more. CONSTITUTION:A video signal of a waveform (a) becomes a waveform (b) after passing through a pre-emphasis circuit 21, and a waveform (e) through an amplitude limit circuit 28. The frequency shift at the output side of an FM modulator 24 is within a band of a BPF25 and no instantaneous amplitude is lowered. Thus, the waveform becomes a waveform (f) through a de-emphasis circuit at the reception side and almost no distortion is appeared. On the other hand, an audio subcarrier signal obtained from a terminal 11 is applied to a synthesis circuit 23 after the circuit 28, then no effect is imposed by them. As conventionally, without the LIM28, the demodulation waveform is as (c), and a distorted waveform (d) is obtained after the reception, but by providing the LIM28 additionally, when a limited band of transmission circuit like satellite communication is effectively used, unpleasant distortion or click is eliminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17413280A JPS5797277A (en) | 1980-12-09 | 1980-12-09 | Television video audio simultaneous transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17413280A JPS5797277A (en) | 1980-12-09 | 1980-12-09 | Television video audio simultaneous transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5797277A true JPS5797277A (en) | 1982-06-16 |
Family
ID=15973213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17413280A Pending JPS5797277A (en) | 1980-12-09 | 1980-12-09 | Television video audio simultaneous transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5797277A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62189890A (en) * | 1986-02-17 | 1987-08-19 | Hitachi Ltd | Light transmitter for selecting video |
| KR20190040960A (en) | 2016-08-10 | 2019-04-19 | 스미도모쥬기가이고교 가부시키가이샤 | Film forming method and film forming apparatus |
-
1980
- 1980-12-09 JP JP17413280A patent/JPS5797277A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62189890A (en) * | 1986-02-17 | 1987-08-19 | Hitachi Ltd | Light transmitter for selecting video |
| KR20190040960A (en) | 2016-08-10 | 2019-04-19 | 스미도모쥬기가이고교 가부시키가이샤 | Film forming method and film forming apparatus |
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