PAL (4.43), NTSC, SECAM (3.38). Mainly Eastern and Western countries in the formulation of official TV broadcast standards and video products production are involved in this issue, China uses PAL system. At present, VCD, DVD, EVD, most TV sets are compatible with these standards, and video editing software has the output function of these standards. Therefore, you can shoot and produce videos of various standards as needed.
The following is a detailed introduction of the standard organized by Shenzhen Xuanzhan Technology, I hope to help you.
NTSC stands for quadrature balanced amplitude modulation.
PAL is a quadrature balanced amplitude-modulation system.
The PAL TV standard is: 25 frames per second, the TV scan line is 625 lines, the odd field is in the front, the even field is in the back, the standard digital PAL TV standard resolution is 720*576, the color bit depth of 24 bits, the aspect ratio of the picture is 4:3, the PAL TV standard is used in China, Europe and other countries and regions.
The NTSC TV standard is: 29.97 frames per second (simplified to 30 frames), the TV scan line is 525 lines, even field is in front, odd field is behind, the standard digital NTSC TV standard resolution is 720X486, 24 bits of color depth, the picture aspect ratio is 4:3. NTSC TV standards are used in the United States, Japan and other countries and regions.
The difference between PAL and NTSC is that the program color encoding, decoding mode and field scanning frequency are different. China (excluding Hong Kong), India, Pakistan and other countries adopt PAL system, and the United States, Japan, South Korea and Taiwan adopt NTSC system.
What is the difference between auto focus camera PAL and NTSC?
auto focus camera，PAI makes one of the two color difference signals transmitted at the same time by line inversion, and the other color difference signal by quadrature modulation. In this way, if phase distortion occurs during signal transmission, it will complement each other due to the opposite phase of the two adjacent lines of signals, thus effectively overcoming the color change caused by phase distortion. Therefore, the PAL system is insensitive to phase distortion, the image color error is small, and the compatibility with black and white TV is good, but the encoder and decoder of the PAL system are more complex than that of the NTSC system, the signal processing is more troublesome, and the cost of the receiver is high.
NTSC chrominance signal modulation is characterized by balanced quadrature AM, that is, including balanced modulation and quadrature modulation, although it solves the problem of compatibility between color television and black and white television broadcasting, there are shortcomings of easy phase distortion and unstable color. The power supply frequency of NTSC TV is 60Hz, the field frequency is 60 fields per second, the frame rate is 30 frames per second, the scan line is 525 lines, and the image signal bandwidth is 6.2MHz. Countries that adopt the NTSC system include the United States and Japan.
Here is a point: In addition to the NTSC and PAI systems introduced above, there is another system called SECAM
Auto focus camera in the signal transmission process, the brightness signal is transmitted each line, and the two color difference signals are transmitted line by line, that is, the method of staggered transmission time to avoid the crosstalk and color distortion caused by the simultaneous transmission. SECAM system is characterized by not afraid of interference, good color effect, but poor compatibility. Frame rate 25 frames per second, scan line 625, interlaced, picture ratio 4:3, resolution 720×576. The SECAM system is mainly adopted by Russia, France, Egypt and so on.