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
 
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