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In PAL system the polarity of the phase in each frame is reversed to neutralize the undesirable phase shifts introduced during transmission. Thus the effect of undesirable phase shift is positive in one frame and negative in the second frame. Averaging the two, the effect of the undesirable phase shifts in two consecutive frames cancel each other.
The analog PAL-M was scheduled to be supplanted by a digital high-definition system named Sistema Brasileiro de Televisão Digital (SBTVD) by 2015, and finishing in 2018. From 1999 to 2000, the ABERT/SET group in Brazil did system comparison tests of ATSC, DVB-T and ISDB-T under the supervision of the CPqD foundation.
BTW the exact same setup is used for CABLE as well. Now, where does all this PAL-Nc come from? Here you have an ITU document about TV systems however the problem might have originated in a previous one. Page 11 Table 2 shows a comparison between systems and here is the problem... PAL-N is in TWO of these columns, with a little note.
On PAL displays the effect is also present, but generates more limited colors. [8] [9] Depending on the exact PAL system used results will vary (if PAL-M or PAL-N are used, color artifacts similar to NTSC might be possible). Although related, artifact colors are not the same as horizontal blurring.
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This was an evolution from older color TV systems (such as PAL or SECAM) fixing the problems of interference between luminance and chrominance, and providing a stepping stone for a future HDTV system. [10] [9] In 1986, a new high definition broadcasting standard, HD-MAC, was presented, offering twice the number of scanning lines compared to PAL ...