576i

576i ialah mod video definisi standard asalnya digunakan untuk televisyen daratan di kebanyakan negara di dunia di mana frekuensi utiliti untuk pengagihan tenaga elektrik adalah 50 Hz. Kerana hubungan rapatnya dengan sistem pengekodan warna, ia sering dirujuk sebagai hanya PAL, PAL/SECAM atau SECAM jika dibandingkan dengan 60 Hz (biasanya, lihat PAL-M) NTSC -warna-dikodkan rakan sejawatannya, 480i. Dalam aplikasi digital, ia biasanya dirujuk sebagai "576i"; dalam konteks analog, ia sering disebut " 625 baris",^[1] dan nisbah aspek biasanya 4: 3 dalam penghantaran analog dan 16: 9 dalam transmisi digital.^[2]

Rujukan sunting

^ AfterDawn.com. "576i - AfterDawn: Glossary of technology terms & acronyms".
^ The 625-line television standard was introduced in the early 1950s. After tracing a frame on a CRT, the electron beam has to be moved from the bottom right to the top left of the screen ready for the next frame. The beam is blanked, no information is transmitted for the duration of 49 lines, and circuitry relatively slow by modern standards executes the retrace.

[1] AfterDawn.com. "576i - AfterDawn: Glossary of technology terms & acronyms".

[2] The 625-line television standard was introduced in the early 1950s. After tracing a frame on a CRT, the electron beam has to be moved from the bottom right to the top left of the screen ready for the next frame. The beam is blanked, no information is transmitted for the duration of 49 lines, and circuitry relatively slow by modern standards executes the retrace.

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