<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: I-Passage: IKomidi Lezinhlelo Zomabonakude Kazwelonke lasungulwa ngo-1940 yi-United States Federal Communications Commission FCC ukuxazulula izingxabano phakathi kwezinkampani mayelana nokwethulwa kohlelo lwe-analogue yethelevishini kuzwelonke e-United States. Ngo-March 1941, ikomiti yakhipha indinganiso yezobuchwepheshe yethelevishini emnyama nomhlophe eyayisekelwe eselulekweni esakhishwa yi-Radio Manufacturers Association RMA ngo-1936. Intuthuko yezobuchwepheshe yendlela yokwakha amabhendi aseceleni avumela ithuba lokukhulisa isinqumo sesithombe. I-NTSC yakhetha imigqa yokuskena engama-525 njengokuvumelana phakathi kwe-RCAs 441-scan line standard esivele isetshenziswa yinethiwekhi ye-NBC TV ye-RCA nesifiso sikaPhilco noDuMont sokukhulisa inani lemigqa yokuskena ibe phakathi kuka-605 no-800. Le nqubo yayincoma isivinini sezithombe ezingu - 30 ngomzuzwana, esinezindawo ezimbili ezihlanganiswe ndawonye ngesivinini semigqa engu - 262,5 ngomzuzwana nezindawo ezingu - 60 ngomzuzwana. Ezinye izindinganiso ezinconyweni zokugcina kwakuyi-aspect ratio ka-4: 3, kanye ne-frequency modulation FM yesiginali yomsindo okwakuyinto entsha ngaleso sikhathi. Umbuzo: Yisiphi isimiso esasinconyelwe isignali yomsindo?  <response>: ukuguquguquka kwemvamisa FM 