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  1. 1. ‫‪FEATURE‬‬ ‫‪Aspect Ratio‬‬ ‫ﻣﻌﺪﻝ ﻋﺮﺽ ﺍﻟﺼﻮﺭﺓ ﺇﻟﻰ‬ ‫ﺍﺭﺗﻔﺎﻉ ﺍﻟﺼﻮﺭﺓ ﺍﻟﻤﺴﻤﻰ‬ ‫‪Aspect ratio‬‬ ‫ﺃﻟﻴﺲ ﻫﺬﺍ ﺑﺴﻴﻄﺎ ؟‬ ‫ﺑﻘﻠﻢ : ﺑﻴﺘﺮ ﻣﻴﻠﻠﺮ‬ ‫ﺇﻥ ‪ Aspect ratio‬ﻭ ﻣﻌﻨﺎﻩ ﻣﻌﺪﻝ ﻋﺮﺽ ﺍﻟﺼﻮﺭﺓ ﺇﻟﻰ ﺍﺭﺗﻔﺎﻉ ﺍﻟﺼﻮﺭﺓ ﻓﻘﺪ‬ ‫ﻇﻞ ﺇﻟﻲ ﺍﻟﻌﺪﻳﺪ ﻣﻦ ﺍﻟﻌﻘﻮﺩ ﻳﺴﺘﺨﺪﻡ ﺑﻘﻴﻢ ﻣﺨﺘﻠﻔﺔ ﺗﺘ ﺮﺍﻭﺡ ﺑﻴﻦ 1:91.1 ﺇﻟﻰ 1:4‬ ‫، ﻭ ﻋﻤﻠﻴﺎ ﺗﺘﻮﺍﻓﻖ ﺍﺛﻨﺘﺎﻥ ﻣﻨﻬﻢ ﻟﻌﺮﺽ ﺍﻟﺼﻮﺭﺓ ﺍﻟﺮﻗﻤﻴﺔ - 1:33.1‬ ‫) ﺃﻭ 3:4 ﺍﻟﻌﺎﺩﻱ ( ﻭ 1:65.1 ) ﺃﻭ 9:61 ﺍﻟﻌﺮﻳﺾ ( .‬ ‫ﻣﻌﺪﻝ ﺍﻟﻌﺮﺽ ﺍﻟﺨﺎﺹ ﺑﺎﻟﺘﻠﻴﻔﺰﻳﻮﻥ‬ ‫ﺇﻥ ﺻﻮﺭﺓ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻌﺎﺩﻳﺔ ﺩﺍﺋﻤﺎ‬ ‫ﺍﻟﻔﺎﺋﻖ ﺍﻟﺘﻔﺎﺻﻴﻞ ‪ HDTV‬ﻭ ﻟﻜﻦ‬ ‫ﺗﺒﺚ ﺑﻤﻌﺪﻝ ﻋﺮﺽ 3:4 ﻟﻜﻦ ﻓﻰ‬ ‫ﺑﺠﻮﺩﺓ ﺻﻮﺭﺓ ﺍﻗﻞ ، ﻭ ﺑﻴﻨﻤﺎ ﺃﻥ ﺍﻟﺼﻮﺭﺓ‬ ‫ﺑﻌﺾ ﺍﻷﺣﻴﺎﻥ ﺗﺠﺪ ﺃﻥ ﺍﻟﺸﺎﺷﺎﺕ‬ ‫ﺍﻟﻌﺎﺩﻳﺔ ﺍﻟﺘﻰ ﺗﻌﻤﻞ ﻋﻠﻰ ﻣﻌﺪﻝ ﻋﺮﺽ‬ ‫ﺍﻟﻌﺮﻳﻀﺔ ﺗﻌﻤﻞ ﺑﻤﻌﺪﻝ ﻋﺮﻳﺾ 9:61‬ ‫3:4 ﻭ ﺍﻟﺼﻮﺭﺓ ﺍﻟﻔﺎﺋﻘﺔ ﺍﻟﺘﻔﺎﺻﻴﻞ ﺍﻟﺘﻰ‬ ‫ﻭ ﺍﻟﻤﻌﺪﻝ ﺍﻷﺧﻴﺮ ﻟﻴﺲ ﺑﺪﻳﻼ ﻋﻦ‬ ‫ﻋﻤﻞ ﻋﻠﻰ ﻣﻌﺪﻝ ﻋﺮﺽ 9:61 ﺗﻜﻮﻥ‬ ‫ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻔﺎﺋﻖ ﺍﻟﺘﻔﺎﺻﻴﻞ ‪HDTV‬‬ ‫ﻋﻠﻰ ﺷﻜﻞ ﻣﺮﺑﻊ ﺇﻻ ﺃﻥ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ‬ ‫! ﻭ ﻫﺬﺍ ﻣﺎ ﻫﻮ ﻣﻮﺿﻊ ﻓﻰ ﺍﻟﺸﻜﻞ ﺭﻗﻢ‬ ‫ﺍﻟﻌﺎﺩﻱ ﺍﻟﻌﺮﻳﺾ ﻳﺴﺘﺨﺪﻡ ﻧﻘﺎﻁ ﺿﻮﺋﻴﺔ‬ ‫1 ﻛﻤﺎ ﻳﻤﻜﻦ ﺃﻥ ﺗﺮﻯ ﺍﻧﻪ ﻳﻮﺟﺪ ﺍﻟﺒﻴﻜﺴﻞ‬ ‫ﻣﻤﺪﻭﺩﺓ ﺃﻓﻘﻴﺎ .‬ ‫) ﺍﻟﻨﻘﺎﻁ ﺍﻟﻀﻮﺋﻴﺔ ( ﺑﺸﻜﻞ ﺍﻛﺜﺮ ﻓﻰ‬ ‫ﺣﺎﻟﺔ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻔﺎﺋﻖ ﺍﻟﺘﻔﺎﺻﻴﻞ ﺇﺫﺍ‬ ‫ﻭ ﻟﻜﻦ ﻛﻴﻒ ﻳﺘﻢ ﻋﺮﺽ ﺍﻟﺼﻮﺭﺓ‬ ‫ﻣﺎ ﻗﻮﺭﻥ ﺑﺎﻟﺼﻮﺭﺓ ﺫﺍﺕ ﻣﻌﺪﻝ ﺍﻟﻌﺮﺽ‬ ‫ﺑﻤﺨﺘﻠﻒ ﺃﻧﻮﺍﻉ ﺍﻟﻌﺮﺽ ﺗﻈﻬﺮ ﻋﻠﻰ‬ ‫ﺍﻟﻌﺎﺩﻱ ﻭ ﺍﻟﻌﺮﻳﺾ ، ﺃﻭ ﺑﻤﻌﻨﻰ ﺁﺧﺮ‬ ‫ﺷﺎﺷﺔ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﺨﺎﺻﺔ ﺑﻚ ؟ ﺍﻥ ﻫﺬﺍ‬ ‫ﺇﻥ ﺍﻟﺼﻮﺭﺓ ﺍﻟﻌﺎﺩﻳﺔ ‪ SDTV‬ﺍﻟﺘﻰ ﺗﻌﻤﻞ‬ ‫ﻳﻌﺘﻤﺪ ﻋﻠﻰ ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ ﺍﻟﺮﻗﻤﻲ‬ ‫ﺑﻤﻌﺪﻝ ﻋﺮﺽ ﻋﺮﻳﺾ ﻟﺪﻳﻬﺎ ﻧﻔﺲ‬ ‫ﻭ ﺟﻬﺎﺯ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ‬ ‫ﻧﻔﺴﻪ ، ﻭ ﺩﻋﻨﺎ ﻧﺸﺮﺡ‬ ‫ﺍﻻﺧﺘﻼﻓﺎﺕ .‬ ‫ﺍﻟﺸﻜﻞ ﺭﻗﻢ 1 : ﻣﻌﺪﻝ ﺍﻟﻌﺮﺽ ﻟﺼﻮﺭﺓ ﻟﻠﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻌﺎﺩﻱ ﻭ ﺍﻟﻌﺮﻳﺾ ﻭ‬ ‫ﺍﻟﻔﺎﺋﻖ ﺍﻟﺘﻔﺎﺻﻴﻞ ، ﺍﻟﺠﺰء ﺍﻟﻤﻜﺒﺮ ﻣﻦ ﺍﻟﺸﺎﺷﺔ ﻳﻮﺿﺢ ﺣﺠﻢ ﻭ ﺷﻜﻞ ﺍﻟﻨﻘﺎﻁ‬ ‫ﺍﻟﻀﻮﺋﻴﺔ‬ ‫ﺍﻟﺸﻜﻞ ﺭﻗﻢ 2 : ﺇﺷﺎﺭﺍﺕ 9:61 ﻋﻠﻰ ﺗﻠﻴﻔﺰﻳﻮﻥ 3:4‬ ‫‪ Pan & Scan‬ﻭ ‪ ، Letterbox‬ﻭ ﻳﻨﺘﺞ ﻋﻦ‬ ‫ﺇﺷﺎﺭﺍﺕ ﺍﻟﺼﻮﺭﺓ 9:61 ﻋﻠﻰ‬ ‫ﺍﺳﺘﺨﺪﺍﻡ ﻃﺮﻳﻘﺔ ﺍﻟﻌﺮﺽ ‪ Letterbox‬ﺗﻈﻬﺮ‬ ‫ﺗﻠﻴﻔﺰﻳﻮﻥ ﻋﺎﺩﻯ 3:4‬ ‫ﺷﺮﻳﻂ ﺍﺳﻮﺩ ﺍﺳﻔﻞ ﻭ ﺃﻋﻠﻰ ﺍﻟﺸﺎﺷﺔ ﺑﻴﻨﻤﺎ ﻃﺮﻳﻘﺔ‬ ‫‪ Pan & Scan‬ﺟﺰء ﻣﻦ ﺍﻟﺼﻮﺭﺓ ﻭﻟﻜﻦ ﺑﺪﻭﻥ‬ ‫ﺇﻥ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻌﺎﺩﻱ ﺍﻟﺘﻘﻠﻴﺪﻱ ﻻ ﻳﻌﻤﻞ ﺃﻱ ﺷﺊ‬ ‫ﺍﻟﺸﺮﻳﻂ ﺍﻷﺳﻮﺩ ﺍﻟﻤﺰﻋﺞ ، ﻭ ﺍﻟﺬﻯ ﻳﺴﺘﺤﻖ ﻣﻌﺮﻓﺘﻪ‬ ‫ﺗﺠﺎﻩ ﻣﻌﺪﻝ ﺍﻟﻌﺮﺽ ﻭ ﻟﻬﺬﺍ ﻳﻌﺘﻤﺪ ﻋﻠﻰ ﺍﻹﺷﺎ ﺭﺍﺕ‬ ‫ﺍﻧﻪ ﻳﻈﻬﺮ ﺍﻟﺠﺰء‬ ‫ﻓﻰ ﻧﻈﺎﻡ ‪Pan & Scan‬‬ ‫ﺍﻟﻮﺍﺭﺩﺓ ﻣﻦ ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ . ﺍﻟﺸﻜﻞ ﺭﻗﻢ 2 ﻳﻈﻬﺮ‬ ‫ﺍﻷﻭﺳﻂ ﻣﻦ ﺍﻟﺼﻮﺭﺓ ) ﻛﻤﺎ ﻓﻰ ﺍﻟﺸﻜﻞ ﺭﻗﻢ 2 ( .‬ ‫ﻋﺪﺩ 2 ﻃﺮﻳﻘﺔ ﺿﺒﻂ ﻣﻦ ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ ﻭ ﻫﻰ‬ ‫‪18 TELE-satellite & Broadband — 12-01/2008 — www.TELE-satellite.com‬‬
  2. 2. www.TELE-satellite.com — 12-01/2008 — TELE-satellite & Broadband 19
  3. 3. ‫ﻭ ﻻﺣﻆ ﺍﻟﻔﺮﻕ ﻋﻨﺪﻣﺎ ﺗﺸﺎﻫﺪﻩ ﻗﻨﺎﺓ‬ ‫ﺗﺒﺚ ﺑﻨﻈﺎﻡ ﺍﻟﺼﻮﺭﺓ ﺍﻟﻌﺮﻳﻀﺔ 9:61‬ ‫ﻭ ﺳﻴﻜﻮﻥ ﻣﻦ ﺍﻷﻓﻀﻞ ﺃﻥ ﻳﻜﻮﻥ‬ ‫ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻧﻴﻦ ﺑﻨﻔﺲ ﺍﺭﺗﻔﺎﻉ ﻋﺮﺽ‬ ‫ﺍﻟﺸﺎﺷﺔ ﻭ ﻧﺤﻦ ﻓﻰ ﺍﻧﺘﻈﺎﺭ ﺻﻮﺭﻛﻢ‬ ‫ﻋﻨﺪ ﺗﺸﻐﻴﻞ ﻃﺮﻳﻘﺔ ‪Pan & Scan‬‬ ‫!.‬ ‫ﺇﺷﺎﺭﺍﺕ ﺍﻟﺼﻮﺭﺓ 3:4‬ ‫ﻋﻠﻰ ﺗﻠﻴﻔﺰﻳﻮﻥ ﻋﺎﺩﻯ 3:4‬ ‫ﺗﺒﺚ ﺃﻓﻼﻡ ﺳﻴﻨﻤﺎﺋﻴﺔ ﻋﺮﻳﻀﺔ ﻋﻦ ﻃﺮﻳﻖ ﺇﺷﺎ ﺭﺍﺕ 3:4 ،‬ ‫ﻭ ﺑﻴﻨﻤﺎ ﺗﺘﻢ ﻋﻤﻠﻴﺔ ﺗﺸﻔﻴﺮ ﺍﻹﺷﺎ ﺭﺍﺕ ﺍﻟﺮﻗﻤﻴﺔ ﻳﻤﻜﻦ ﺃﻥ‬ ‫ﺍﻧﻈﺮ ﺍﻟﺸﻜﻞ ﺭﻗﻢ 3 ، ﺇﺫﺍ ﻛﺎﻧﺖ ﺍﻹﺷﺎ ﺭﺍﺕ ﺍﻟﻤﺮﺳﻠﺔ ﺑﻨﻈﺎﻡ‬ ‫ﺗﺘﻀﻤﻦ ﺟﻤﻴﻊ ﺃﺟ ﺰﺍء ﺍﻟﺼﻮﺭﺓ ﻓﻴﻤﻜﻨﻨﺎ ﻣﺸﺎﻫﺪﺓ ﻭﺳﻂ ﺍﻟﺼﻮﺭﺓ‬ ‫3:4 ﻳﻮﺟﺪ ﺑﻬﺎ ﺷﺮﻳﻂ ﺍﺳﻮﺩ ﺃﻋﻠﻰ ﻭ ﺍﺳﻔﻞ ﺍﻟﺸﺎﺷﺔ ﻓﺴﻮﻑ‬ ‫ﺃﻭ ﺍﻟﺠﺰء ﺍﻷﻳﻤﻦ ﺃﻭ ﺍﻷﻳﺴﺮ ، ﻭ ﻫﺬﺍ ﺍﻟﺸﻲء ﻳﻌﻤﻞ ﺑﻄﺮﻳﻘﺔ‬ ‫ﺗﺮﻯ ﻫﺬﻩ ﺍﻟﺸ ﺮﺍﺋﻂ ﺍﻟﺴﻮﺩﺍء ﻋﻠﻰ ﺍﻟﺸﺎﺷﺔ ﺑﻐﺾ ﺍﻟﻨﻈﺮ ﻋﻦ‬ ‫ﺃﺗﻮﻣﺎﺗﻴﻜﻴﺔ ﻭ ﻻ ﻧﺸﻌﺮ ﺑﻪ ، ﻭ ﺇﺫﺍ ﻛﻨﺖ ﻻ ﺗﺼﺪﻗﻨﻲ ﻗﻢ ﺑﺒﺴﺎﻃﺔ‬ ‫ﺿﺒﻂ ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ .‬ ‫ﺑﻮﺿﻊ ﺗﻠﻴﻔﺰﻳﻮﻥ ﻋﺎﺩﻯ 3:4 ﻓﻮﻕ ﺗﻠﻴﻔﺰﻳﻮﻥ ﻋﺮﻳﺾ 9:61‬ ‫ﺇﺫﺍ ﻛﺎﻧﺖ ﺍﻟﺼﻮﺭﺓ ﺍﻟﻤﺮﺳﻠﺔ 3:4 ﻓﻼ‬ ‫ﺗﻮﺟﺪ ﻣﺸﻜﻠﺔ ، ﻓﻨﺤﻦ ﻧﺮﻯ ﻫﺬﺍ ﻋﻠﻰ‬ ‫ﺃﻱ ﺟﻬﺎﺯ ﺗﻠﻴﻔﺰﻳﻮﻥ ﻋﺎﺩﻯ ، ﺇﻥ ﺃﻏﻠﺒﻴﺔ‬ ‫ﺍﻟﻘﻨﻮﺍﺕ ﺍﻟﺮﻗﻤﻴﺔ ﺍﻟﺘﻰ ﺗﺒﺚ ﻋﻠﻰ ﺍﻟﻘﻤﺮ‬ ‫ﺍﻟﺼﻨﺎﻋﻲ ﻣﺎﺯﺍﻟﺖ ﺗﺴﺘﺨﺪﻡ ﺇﺷﺎ ﺭﺍﺕ‬ ‫ﺍﻟﺼﻮﺭﺓ ﻫﺬﻩ ﻭ ﻟﻜﻦ ﻳﺤﺪﺙ ﺃﺣﻴﺎﻧﺎ ﺃﻥ‬ ‫ﺍﻟﺸﻜﻞ ﺭﻗﻢ 3 : ﺇﺫﺍ ﻛﺎﻧﺖ ﺇﺷﺎﺭﺍﺕ ﺍﻟﺼﻮﺭﺓ‬ ‫ﺍﻟﻤﺮﺳﻠﺔ3:4 ﺗﺤﺘﻮﻯ ﻋﻠﻰ ﺷﺮﻳﻂ ﺍﺳﻮﺩ‬ ‫ﺍﺳﻔﻞ ﻭ ﺃﻋﻠﻰ ﺍﻟﺸﺎﺷﺔ ) ﺑﻌﺪ ﺍﻟﺘﺤﻮﻳﻞ‬ ‫ﻣﻦ ﻓﻴﻠﻢ ﻋﺮﻳﺾ ( ﻓﺴﻮﻑ ﻧﺸﺎﻫﺪﻫﺎ‬ ‫ﻋﻠﻰ ﺷﺎﺷﺔ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻌﺎﺩﻱ 3:4‬ ‫ﺑﻐﺾ ﺍﻟﻨﻈﺮ ﻋﻦ ﻃﺮﻳﻘﺔ ﺍﻟﻀﺒﻂ‬ ‫‪20 TELE-satellite & Broadband — 12-01/2008 — www.TELE-satellite.com‬‬
  4. 4. ‫ﺍﻷﻳﻤﻦ ﻭ ﺍﻷﻳﺴﺮ ﻣﻦ ﺍﻟﺸﺎﺷﺔ ﺳﻮﻑ ﻳﻈﻬﺮ ﻭ ﻟﻴﺲ‬ ‫ﺍﻟﺤﺼﻮﻝ ﻋﻠﻰ ﺻﻮﺭ ﻣﺨﺘﻠﻔﺔ ﻋﻦ ﻃﺮﻳﻖ ﺟﻬﺎﺯ‬ ‫ﺍﻟﻮﺳﻂ ﻓﻘﻂ . ﻭ ﻟﻜﻦ ﻫﺬﺍ ﺍﻻﺧﺘﻴﺎﺭ ﻟﻴﺲ ﻣﻨﺎﺳﺒﺎ ﻓﻰ‬ ‫ﺍﻟﺮﻳﺴﻴﻔﺮ ﻭ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﻧﻔﺴﻪ . ﻓﺒﻴﻨﻤﺎ ﺃﻥ ﺍﻟﻮﻇﺎﺋﻒ‬ ‫ﺣﺎﻟﺔ ﺗﺤﻮﻳﻞ ﺇﺷﺎ ﺭﺍﺕ 3:4 ﻟﻔﻴﻠﻢ ﻋﺮﻳﺾ ، ﺍﻧﻈﺮ‬ ‫ﻗﺪ ﺗﺨﺘﻠﻒ ﺑﻴﻦ ﻣﻮﺩﻳﻞ ﻭ ﺁﺧﺮ ﻓﺎﻥ ﺟﻤﻴﻊ ﺃﺟﻬﺰﺓ‬ ‫ﺍﻟﺠﺰء ﺍﻟﺴﻔﻠﻲ ﻣﻦ ﺍﻟﺮﺳﻢ ، ﻭ ﻓﻰ ﻫﺬﻩ ﺍﻟﺤﺎﻟﺔ ﻓﺎﻥ‬ ‫ﺍﻟﺮﻳﺴﻴﻔﺮ ﻳﻮﺟﺪ ﺑﻬﺎ ﻭﻇﻴﻔﺘﺎﻥ ﺭﺋﻴﺴﻴﺘﺎﻥ ﺍﻟﻌﺮﺽ‬ ‫ﺍﻟﻄﺮﻳﻘﺔ ﺍﻷﻓﻀﻞ ﻟﻠﻀﺒﻂ ﻫﻰ ‪ Pan & Scan‬ﻣﻦ‬ ‫ﺍﻟﺼﻮﺭﺓ ﻭ ﻫﻤﺎ ‪ Letterbox‬ﻭ ‪. Pan & Scan‬‬ ‫ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ ﻭ ﻋﻠﻰ ﺍﻟﻮﺿﻊ ﺍﻟﻌﺎﺩﻱ ﻣﻦ ﺟﻬﺎﺯ‬ ‫ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ .‬ ‫ﺑﻌﺾ ﺃﺟﻬﺰﺓ ﺍﻟﺮﻳﺴﻴﻔﺮ ﺍﻟﺮﻗﻤﻴﺔ ﻳﻤﻜﻨﻬﺎ‬ ‫ﻋﺮﺽ ﺍﻟﺼﻮﺭﺓ ﻛﺎﻣﻠﺔ ﻓﻰ ﺣﺎﻟﺔ ﺇﺫﺍ ﻛﺎﻧﺖ‬ ‫ﻭ ﻣﻦ ﺍﻟﻮﺍﺿﺢ ﺃﻥ ﻫﻨﺎﻙ ﺗﺄﺛﻴ ﺮﺍﺕ ﻣﻤﺎﺛﻠﺔ‬ ‫ﺇﺫﺍ ﺍﺳﺘﺨﺪﻣﻨﺎ ‪ Letterbox‬ﺑﺎﻹﺿﺎﻓﺔ ﺇﻟﻰ‬ ‫ﺍﻟﺘﻘﺮﻳﺐ ‪ ) Zoom‬ﻻ ﺗﻈﻬﺮ ﻓﻰ ﺍﻟﺮﺳﻢ ( ﻭ ﻟﻜﻦ‬ ‫ﺟﻮﺩﺓ ﺍﻟﺼﻮﺭﺓ ﺳﻮﻑ ﺗﻜﻮﻥ ﺃﺳﻮء ، ﻭ ﻫﺬﺍ ﻷﻧﻨﺎ‬ ‫ﺃﻧﺘﺠﻨﺎ ﺻﻮﺭﺓ ﺻﻐﻴﺮﺓ ﻟﺘﻜﺒﻴﺮﻫﺎ ﻻﺣﻘﺎ ﻓﻰ ﺟﻬﺎﺯ‬ ‫ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﻓﻤﻦ ﺍﻷﻓﻀﻞ ﺇﻧﺘﺎﺝ ﺻﻮﺭﺓ ﻛﺒﻴﺮﺓ ﻓﻰ‬ ‫ﺍﻟﺮﻳﺴﻴﻔﺮ ﻧﻔﺴﻪ .‬ ‫ﺍﻟﺨﺎﺗﻤﺔ‬ ‫ﺇﺫﺍ ، ﻛﻴﻒ ﻳﺠﺐ ﺃﻥ ﻧﻀﺒﻂ ﺟﻬﺎﺯ‬ ‫ﺍﻟﺮﻳﺴﻴﻔﺮ ﻭ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ؟ ﻻ ﺗﻮﺟﺪ‬ ‫‪Figure 4. Playing 4:3 signal on‬‬ ‫.‪ 16:9 TV-set‬ﻃﺮﻳﻘﺔ ﺿﺒﻂ ﻣﻨﺎﺳﺒﺔ ﺣﺘﻰ ﺍﻵﻥ ﻟﺠﻤﻴﻊ‬ ‫ﺃﻧﻮﺍﻉ ﺍﻹﺷﺎ ﺭﺍﺕ ﻭ ﻋﻤﻮﻣﺎ ﻫﺬﺍ ﻳﺮﺟﻊ ﺇﻟﻴﻚ‬ ‫، ﻣﺎ ﺇﺫﺍ ﻛﺎﻥ ﺍﻟﺸﺮﻳﻂ ﺍﻷﺳﻔﻞ ﺃﻭ ﺍﻟﺮﻣﺎﺩﻱ‬ ‫ﻓﻰ ﺍﺳﻔﻞ ﻭ ﺃﻋﻠﻰ ﺍﻟﺸﺎﺷﺔ ﻳﻀﺎﻳﻘﻚ ﺃﻭ ﻻ ، ﻛﻤﺜﺎﻝ‬ ‫ﻳﻤﻜﻨﻚ ﻗﺒﻮﻝ ﻫﺬﺍ ﺇﺫﺍ ﻛﺎﻥ ﺟﻬﺎﺯ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﺬﻯ‬ ‫ﺗﺴﺘﺨﺪﻣﻪ ﻛﺒﻴﺮ ﺍﻟﺤﺠﻢ ﻣﻤﺎ ﻳﻘﺮﺏ ﺣﺠﻢ ﺍﻟﺼﻮﺭﺓ ﻣﻦ‬ ‫ﺍﻹﺷﺎ ﺭﺍﺕ ﺍﻟﻤﺮﺳﻠﺔ ﺗﺘﻨﺎﺳﺐ‬ ‫ﺍﻟﺸﻜﻞ ﺍﻟﻄﺒﻴﻌﻲ ﻟﻬﺎ ﻗﺪﺭ ﺍﻹﻣﻜﺎﻥ .‬ ‫ﻣﻊ ﺍﻟﻌﺮﺽ ﺑﻜﺎﻣﻞ ﺍﻟﺸﺎﺷﺔ‬ ‫ﻭ ﺗﻘﻮﻡ ﺑﻌﻤﻠﻴﺔ ﺍﻟﻀﻐﻂ‬ ‫ﻻ ﺑﺪ ﺃﻥ ﻧﻘﻮﻡ ﺑﺘﻐﻴﻴﺮ ﺍﻟﻀﺒﻂ ﺑﺠﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ‬ ‫ﺍﻷﻓﻘﻲ )ﺍﻟﺼﻮﺭﺓ ﺍﻟﻤﺮﺳﻠﺔ‬ ‫ﻭ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﻣﻦ ﻭﻗﺖ ﺇﻟﻲ ﺁﺧﺮ ﺇﺫﺍ ﺗﻐﻴﺮ ﺍﻹﺭﺳﺎﻝ‬ ‫9:61 ﻭ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ‬ ‫ﺍﻟﻤﺴﺘﻘﺒﻞ ﻭ ﻟﻜﻦ ﻫﺘﺎﻙ ﻗﺎﻋﺪﺓ ﻋﺎﻣﺔ ﻫﻮ ﺍﻧﻚ ﺗﺪﻉ‬ ‫3:4( ﺃﻭ ﺍﻟﻀﻐﻂ ﺍﻟ ﺮﺃﺳﻲ‬ ‫ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ ﻳﻨﺘﺞ ﻟﻚ ﺍﻟﺼﻮﺭﺓ ﺍﻟﺘﻰ ﺗﺮﻳﺪﻫﺎ ﻭ‬ ‫ﺍﻟﺼﻮﺭﺓ ﺍﻟﻤﺮﺳﻠﺔ 3:4‬ ‫ﻟﻴﺲ ﺟﻬﺎﺯ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﻭ ﺑﻬﺬﻩ ﺍﻟﻄﺮﻳﻘﺔ ﺳﻮﻑ‬ ‫ﻭ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ 9:61( ﻭ‬ ‫ﺗﺤﺼﻞ ﻋﻠﻰ ﺻﻮﺭﺓ ﺫﺍﺕ ﺟﻮﺩﺓ ﺍﻓﻀﻞ .‬ ‫ﺣﻴﺚ ﺃﻥ ﻫﺬﺍ ﻫﺬﻩ ﺍﻟﻄﺮﻳﻘﺔ‬ ‫ﻻ ﺗﺴﺘﺨﺪﻡ ﻛﺜﻴ ﺮﺍ ﻓﻠﻦ ﺍﻗﺪﻡ ﻋﺮﺽ ﻋﻦ ﻫﺬﺍ .‬ ‫ﺇﺷﺎﺭﺍﺕ ﺍﻟﺼﻮﺭﺓ 3:4 ﻋﻠﻰ‬ ‫ﻭ ﻟﺤﺴﻦ ﺍﻟﺤﻆ ﺃﻥ ﺇﺷﺎﺭﺍﺕ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻔﺎﺋﻖ‬ ‫ﻓﻔﻲ ﺍﻟﻐﺎﻟﺐ ﻳﻤﻜﻦ ﻷﻱ ﺟﻬﺎﺯ ﺗﻠﻴﻔﺰﻳﻮﻥ ﺇﻇﻬﺎﺭ‬ ‫ﺍﻟﺘﻔﺎﺻﻴﻞ ‪ HDTV‬ﻭ ﺃﺟﻬﺰﺓ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﺘﻰ ﺗﻌﺮﺽ‬ ‫ﺍﻟﺼﻮﺭﺓ ﺑﺪﻭﻥ ﺗﺪﺧﻞ ) ﺍﻧﻈﺮ ﺍﻟﻌﻤﻮﺩ ﺍﻟﺜﺎﻧﻲ ﻓﻰ‬ ‫ﺗﻠﻴﻔﺰﻳﻮﻥ ﻋﺮﻳﺾ 9:61‬ ‫ﻫﺬﺍ ﺍﻟﻨﻮﻉ ﻣﻦ ﺍﻹﺭﺳﺎﻝ ﺑﻬﻤﺎ ﻧﻔﺲ ﻣﻌﺪﻝ ﻋﺮﺽ‬ ‫ﺍﻟﺸﻜﻞ ﺭﻗﻢ 4 ( ﻋﻤﻠﻴﺔ ﺍﻟﺘﻤﺪﺩ ﺃﻭ ﺍﻟﺘﻘﺮﻳﺐ ) ﺍﻟﻌﻤﻮﺩ‬ ‫ﻟﺪﻳﻨﺎ ﺗﻠﻴﻔﺰﻳﻮﻥ ﺣﺪﻳﺚ ﻣﺴﻄﺢ ﻭ ﺁﺧﺮ ﻣﻦ ﺍﻟﻨﻮﻉ‬ ‫ﺍﻟﺼﻮﺭﺓ 9:61 ، ﻭ ﻋﻨﺪﻣﺎ ﺗﺘﺤﻮﻝ ﺟﻤﻴﻊ ﺍﻟﻘﻨﻮﺍﺕ ﺇﻟﻰ‬ ‫ﺍﻟﺜﺎﻟﺚ ﺍﻟﺸﻜﻞ ﺭﻗﻢ 4 ( ، ﺇﻥ ﻣﻌﻈﻢ ﺍﻟﻤﺴﺘﺨﺪﻣﻴﻦ‬ ‫ﺍﻟﻘﺪﻳﻢ ﺫﺍﺕ ﺍﻷﻧﺒﻮﺏ ﻭ ﻟﻜﻦ ﻛﻼﻫﻤﺎ ﻳﻌﻤﻞ ﻋﻠﻰ‬ ‫ﻧﻈﺎﻡ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻥ ﺍﻟﻔﺎﺋﻖ ﺍﻟﺘﻔﺎﺻﻴﻞ ﻓﻠﻦ ﺗﻜﻮﻥ ﻫﻨﺎﻙ‬ ‫ﻗﺪ ﻳﻔﻀﻠﻮﻥ ﺍﺳﺘﺨﺪﺍﻡ ﻣﻌﺪﻝ ﺍﻟﻌﺮﺽ ‪Letterbox‬‬ ‫ﺍﻟﺼﻮﺭﺓ ﺍﻟﻌﺮﻳﻀﺔ 9:61 ﻭ ﻻ ﻳﺘﻢ ﺍﻟﺘﻨﺎﺳﺐ ﻣﻊ‬ ‫ﻣﺸﻜﻠﺔ ﺑﻌﺪ ﺫﻟﻚ ، ﺩﻋﻮﻧﺎ ﻧﺘﺤﻠﻰ ﺑﺎﻟﺼﺒﺮ .‬ ‫ﻓﻰ ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ ﻭ ﻗﺪ ﺗﺘﺄﺛﺮ ﺍﻟﺼﻮﺭﺓ ﻭﻟﻜﻦ ﺍﻟﺠﺰء‬ ‫ﺍﻹﺷﺎ ﺭﺍﺕ ﺍﻟﻤﺴﺘﻘﺒﻠﺔ ﻭ ﻟﻬﺬﺍ ﻓﺄﻧﻨﻲ ﺃﺭﻳﺪ ﺃﻥ ﺃﻭﺿﺢ‬ ‫‪www.TELE-satellite.com — 12-01/2008 — TELE-satellite & Broadband‬‬ ‫12‬

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