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
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2. www.TELE-satellite.com — 12-01/2008 — TELE-satellite & Broadband 19

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
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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