<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: Ukudlula: Ukufaka imibala kwe-NTSC kusetshenziselwa isignali yethelevishini yeSistimu M, equkethe amafreyimu wevidiyo ahlanganisiwe angama-301.001 cishe angama-29.97 ngomzuzwana. Uhlaka ngalunye lwakhiwe yizinkambu ezimbili, ngayinye equkethe imigqa yokuskena engu-262.5, ingqikithi yemigqa yokuskena engu-525. Imigqa yokuskena engu-486 yakha i-raster ebonakalayo. Isikhathi esisele isikhathi sokuvala esiqondile sivumela ukuvumelanisa okuqondile nokulandela kabusha. Lesi sikhathi sokuvala sasenzelwe ukuvala i-CRT yomamukeli ukuvumela amasekethe alula e-analog nokuhlehla okuhamba kancane kwamamukeli we-TV okuqala. Kodwa-ke, eminye yale migqa manje ingase iqukathe eminye imininingwane efana nemibhalo engezansi evaliwe nekhodi yesikhathi ye-vertical interval VITC. Ku-raster ephelele ngaphandle kwemigqa emibili ngenxa yokuhlanganiswa imigqa yokuskena enezinombolo ezilinganayo yonke eminye imigqa ebingaba ngisho uma ibalwa kusiginali yevidiyo, isb. 2, 4, 6,..., 524 idwetshwa emkhakheni wokuqala, futhi inombolo engalingani yonke eminye imigqa ebingaba ngeyodwa uma ibalwa kusiginali yevidiyo, isb. 1, 3, 5,..., 525 idwetshwa emkhakheni wesibili, ukuze kutholakale isithombe esingenakho ukufiphala kumvamisa wokuvuselela insimu ka-601.001 Hz cishe u-59.94 Hz. Ukuqhathanisa, izinhlelo ze-576i ezifana ne-PAL-B G ne-SECAM zisebenzisa imigqa engama-625 576 ebonakalayo, ngakho-ke zinesinqumo esiphakeme esiqondile, kepha isinqumo esiphansi sesikhathi samafreyimu angama-25 noma izinkambu ezingama-50 ngomzuzwana. Umbuzo: Ama-CRT TV ayedingelani isikhathi sokuvala esiqondile?  <response>: ukuvumelanisa okuqondile nokulandela emuva 