| |
| 视频广播电视标准 |
Most countries around the World use one of three main television broadcast Standards.
These three main standards are NTSC, PAL and SECAM. However, each standard is
not compatible with the other. The charts below give a description of each standard
and the technical variations within each. |
 |
| |
| NTSC制式 |
The first colour TV broadcast system was implemented in the United States in 1953.
This was based on the NTSC (National Television System Committee) standard.
NTSC is used by many countries on the American continent as well as many Asian countries
including Japan. NTSC runs on 525 lines/frame. |
| SYSTEM |
NTSC M |
| Lines/Field |
525/60 |
| Horizantal Frequency |
15.734 kHz |
| Vertical Frequency |
60 Hz |
| Colour Subcarrier Frequency |
3.579545 mHz |
| Video Bandwidth |
4.2 mHz |
| Sound Carrier |
4.5 mHz |
|
| |
| PAL制式 |
The PAL (Phase Alternating Line) standard was introduced in the early 1960's and implemented in most European countries except for France.
The PAL standard utilises a wider channel bandwidth than NTSC which allows for better picture quality. PAL runs on 625 lines/frame. |
|
| SYSTEM |
PAL B,G,H |
PAL I |
PAL D |
PAL N |
PAL M |
| Line/Field |
625/50 |
625/50 |
625/50 |
625/50 |
525/60 |
| Horizontal Frequency |
15.625 kHz |
15.625 kHz |
15.625 kHz |
15.625 kHz |
15.750 kHz |
| Vertical Frequency |
50 Hz |
50 Hz |
50 Hz |
50 Hz |
60 Hz |
| Colour Sub Carrier Frequency |
4.433618 MHz |
4.433618 MHz |
4.433618 MHz |
3.582056 MHz |
3.575611 MHz |
| Video Bandwidth |
5.0 MHz |
5.5 MHz |
6.0 MHz |
4.2 MHz |
4.2 MHz |
| Sound Carrier |
5.5 MHz |
6.0 MHz |
6.5 MHz |
4.5 MHz |
4.5 MHz |
|
| |
| SECAM制式 |
The SECAM (Sequential Couleur Avec Memoire or Sequential Colour with Memory) standard was
introduced in the early 1960's and implemented in France. SECAM uses the same bandwidth as
PAL but transmits the colour information sequentially.
SECAM runs on 625 lines/frame. |
| SYSTEM |
SECAM B,G,H |
SECAM D,K,K1,L |
| Line/Field |
625/50 |
625/50 |
| Horizontal Frequency |
15.625 kHz |
15.625 kHz |
| Vertical Frequency |
50 Hz |
50 Hz |
| Video Bandwidth |
5.0 MHz |
6.0 MHz |
| Sound Carrier |
5.5 MHz |
6.5 MHz |
|
| |
