<prompt> Passage: NTSC ruvara encoding rinoshandiswa pamwe System M terevhizheni chiratidzo, iyo inoumbwa 301.001 anenge 29.97 interlaced mafuremu vhidhiyo por wechipiri. puranga mumwe rinoumbwa minda miviri, mumwe nomumwe ine 262.5 ongororo mitsetse, nokuti dzinokwana 525 ongororo mitsetse. 486 ongororo mitsetse vanoumba zvinooneka raster. Zvakasara the kutwasuka blanking penguva kubvumira kutwasuka synchronization uye retrace. blanking penguva iyi pakutanga yakagadzirirwa kungova blanking ari mugamuchiri wacho CRT kubvumira nyore analoginen circuits uye anononoka kutwasuka kutwasuka okutanga TV vagamuchiri. Zvisinei, vamwe izvi mitsetse zvino anogona ane mamwe mashoko akadai akavharwa captioning uye kutwasuka nguva penguva CITV. In the complete raster disregarding half lines due to interlaced the even-numbered lines even-numbered lines every other line would be even-numbered if the scan was in the field. 486 ongororo mitsetse vanoumba anooneka raster.  <response>: vertical synchronization uye retrace 