What is the Difference Between NTSC and PAL?

The PAL system is also called the Par system. PAL is the abbreviation of Phase Alteration Line in English, which means phase inversion line by line, and it also belongs to the simultaneous system. PAL was proposed by German Walter Bruch in 1967, when he was working for Telefunken. "PAL" is also sometimes used to refer to a 625-line, 25-frame-per-second, interlaced, PAL color-coded television system.

PAL

(TV broadcasting system)

PAL system is also known as

PAL was proposed by German Walter Bruch in 1967, when he was working for Telefunken. "PAL" is also sometimes used to refer to 625 lines, 25 frames per second, interlaced, PAL color-coded

PAL TV standard, 25 frames per second, TV scanning line is 625 lines, odd field is in front, even field is behind, standard digital PAL TV

PAL itself means

These two systems are not compatible with each other. If you play NTSC video on a PAL TV, the picture will become black and white, as will NTSC. Digital video cameras that are used as video shooting tools also have system problems. For example, China uses PAL, and digital cameras sold in China are all PAL. If NTSC cameras are used, the images cannot be captured in PAL. Playback on your TV. Therefore, it can be said with certainty that the digital cameras sold in China must be PAL, and if they are NTSC digital cameras, they must be parallel imports.

PAL and NTSC

Some understanding about the conversion of video and audio tracks between PAL and NTSC.

About the video:

For movies, DVD-NTSC uses the "2: 3Pull-Up" method when storing video, which converts 24 video to 30 video, but 24 video and 30 video after playback. The time is 1 second. The Pal video is directly loaded into the DVD without any processing. In this way, since the Pal system's frame rate is 25 frames, the original movie video is played at 24 frames per second, and it is played every second in the Pal system. After 25 hours, under the premise that the total number of hours is certain, the video of the Pal system will actually shorten the playback time by 4%!

This shows that the same 100-minute movie will still be played on NTSC for 100 minutes, and it will be played on PAL for 96 minutes, that is, a DVD made by PAL will be faster than the same movie made by NTSC 1 / twenty four. When converting time, NTSC time X 24/25 = PAL time

About audio :

Because PAL video is shorter than the original film, in order to synchronize the sound with the video, the sound must also be shorter. How does the sound get shorter? Naturally, the speed of sound playback is accelerated, and the effect can be analogized to the speed of tape playback. As a result, the tone of the sound will become higher. Pal's audio is such a "quick play" process, except that the change in the speed of the sound is only 4%, and the pitch distortion will not be particularly serious.

Then, if a shorter PAL system audio is integrated into a longer NTSC video, in order to achieve audio and video synchronization, the sound must be slowed down by 4%. This process requires resampling, which will result in a certain sound quality. The decline, which explains why PAL's audio track is not suitable for integration with NTSC video.

Supplementary note:

After further research, while changing the speed of sound playback, you can compensate the pitch of the sound to make it sound undistorted. Currently there are free software that can do this, but this process is also lossy. As for how much harm can be caused to the sound quality, it is a matter of opinion.

Conversion between PAL and NTSC:

1. PAL system records 25 frames per second;

2. NTSC system records 30 frames per second; (the scanning lines of the two systems are also different);

3. The DV format is neither PAL nor NTSC, but it does have two versions: 25 frames / second and 30 frames / second;

4. Through the lens, TRV-900 made by PAL records 25 frames / second, while TRV-900 made by NTSC records 30 frames / second;

5. From the digital port (1394 port), TRV-900 (same as other digital cameras) can record 25 frames / second signal and 30 frames / second;

6. From the analog input port, the TRV-900 can only record analog signals (PAL or NTSC) that are the same as the camera system;

7. If you play a DV tape shot by a PAL camera in an NTSC TRV-900, it will output a non-standard 25-frame / second signal with NTSC3.58 color coding. Most televisions play well, but VCRs cannot record. If it is output through a digital port (1394 port), it will output a standard PAL version of the DV signal;

8. Conversely, if you play a DV tape recorded in NTSC format in a PAL TRV-900 camera, it will output a non-standard 30 frame / second signal with NTSC4.43 or PAL color coding (Depending on the camera's menu settings). Most televisions play well, but VCRs cannot record. If it is output through a digital port (1394 port), it will output a standard NTSC version of the DV signal;

9. No camera can convert the number of frames (that is, the number of frames per second) or the scanning line of each frame. This is the key to understanding the problem. When the camera meets other standards, it needs different crystal oscillators to process different signals (3.58 (NTSC) or 4.43 (PAL and NTSC4.43)). But the camera can only have one crystal oscillator;

10. The TRV900 will record still images from the PC card port in its own format. That is, if a user puts a DV tape recorded in NTSC format into a PAL camera, and adds a few seconds of video from a JEPG format file, then these few seconds of video will be recorded in PAL format.

If you are recording or playing back via IEEE-1394, then you are just doing a pure digital file transfer. Therefore, there is no format conversion problem. If it was originally PAL, it will still be PAL after copying. If it was originally NTSC, it will still be NTSC after copying. No matter what system you use.

If you have an analog signal in one system and want to convert it to another system, you need a special image conversion box. If you have one type of digital DV signal and want to convert it to another type of DV signal, you can use software to convert it.