{"id":2789,"date":"2025-08-04T11:21:45","date_gmt":"2025-08-04T04:21:45","guid":{"rendered":"https:\/\/limemediavn.com\/?p=2789"},"modified":"2025-08-16T16:03:56","modified_gmt":"2025-08-16T09:03:56","slug":"la-song-vu-khi-tham-lang","status":"publish","type":"post","link":"https:\/\/limemediavn.com\/en\/la-song-vu-khi-tham-lang\/","title":{"rendered":"L\u00e1 s\u00f3ng – V\u0169 kh\u00ed th\u1ea7m l\u1eb7ng chi\u1ebfn th\u1eafng c\u00e1i “ch\u1ebft” s\u00e2n kh\u1ea5u"},"content":{"rendered":"

Trong m\u00f4i tr\u01b0\u1eddng t\u1ed5 ch\u1ee9c s\u1ef1 ki\u1ec7n chuy\u00ean nghi\u1ec7p, Active Directional Antenna \u2013 hay c\u00f2n g\u1ecdi l\u00e0 l\u00e1 s\u00f3ng \u2013 l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt s\u1ed1ng c\u00f2n gi\u00fap ng\u0103n ch\u1eb7n t\u00ecnh tr\u1ea1ng \u201cch\u1ebft s\u00e2n kh\u1ea5u\u201d. \u0110\u00e2y kh\u00f4ng ch\u1ec9 l\u00e0 thi\u1ebft b\u1ecb thu s\u00f3ng, m\u00e0 c\u00f2n l\u00e0 \u201cng\u01b0\u1eddi g\u00e1c c\u1ed5ng\u201d th\u1ea7m l\u1eb7ng: khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u, t\u0103ng \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh, gi\u1ea3m thi\u1ec3u hi\u1ec7n t\u01b0\u1ee3ng dropout, \u0111\u1ea3m b\u1ea3o micro kh\u00f4ng d\u00e2y ho\u1ea1t \u0111\u1ed9ng m\u01b0\u1ee3t m\u00e0, li\u1ec1n m\u1ea1ch xuy\u00ean su\u1ed1t ch\u01b0\u01a1ng tr\u00ecnh. C\u00f9ng LIME Media & Entertainment<\/a> kh\u00e1m ph\u00e1 v\u00ec sao l\u00e1 s\u00f3ng lu\u00f4n l\u00e0 thi\u1ebft b\u1ecb kh\u00f4ng th\u1ec3 thi\u1ebfu trong m\u1ecdi s\u1ef1 ki\u1ec7n quy m\u00f4 l\u1edbn.<\/span><\/i><\/h4>\n

\"\"<\/a>S\u1ef1 ki\u1ec7n k\u1ef7 ni\u1ec7m 15 n\u0103m th\u00e0nh l\u1eadp c\u1ee7a C\u00f4ng ty C\u1ed5 ph\u1ea7n X\u00e2y d\u1ef1ng H\u1ee3p L\u1ef1c<\/span><\/i><\/p>\n

1. Active Directional Antenna l\u00e0 g\u00ec?<\/strong><\/h2>\n

L\u00e1 s\u00f3ng (Active Directional Antenna) l\u00e0 lo\u1ea1i \u0103ng-ten \u0111\u1ecbnh h\u01b0\u1edbng \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p m\u1ea1ch khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u (active amplifier). Thi\u1ebft b\u1ecb n\u00e0y thu t\u00edn hi\u1ec7u t\u1eeb micro kh\u00f4ng d\u00e2y theo h\u01b0\u1edbng t\u1eadp trung, \u1ed5n \u0111\u1ecbnh v\u00e0 m\u1ea1nh m\u1ebd h\u01a1n nhi\u1ec1u so v\u1edbi anten omni truy\u1ec1n th\u1ed1ng.<\/span><\/p>\n

V\u00ed d\u1ee5 ti\u00eau bi\u1ec3u l\u00e0 d\u00f2ng Shure UA874 v\u1edbi c\u1ea5u tr\u00fac log\u2011periodic dipole array v\u00e0 v\u00f9ng thu s\u00f3ng cardioid. Thi\u1ebft k\u1ebf n\u00e0y gi\u00fap ng\u0103n nhi\u1ec5u t\u1eeb c\u00e1c h\u01b0\u1edbng kh\u00f4ng mong mu\u1ed1n, \u0111\u1ed3ng th\u1eddi cho ph\u00e9p \u0111i\u1ec1u ch\u1ec9nh gain t\u1eeb +12dB \u0111\u1ebfn -6dB, ph\u00f9 h\u1ee3p v\u1edbi chi\u1ec1u d\u00e0i c\u00e1p v\u00e0 \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh th\u1ef1c t\u1ebf.<\/span><\/p>\n

So v\u1edbi anten omni thu t\u00edn hi\u1ec7u 360\u00b0, l\u00e1 s\u00f3ng ch\u1ec9 thu t\u00edn hi\u1ec7u theo m\u1ed9t h\u01b0\u1edbng c\u1ee5 th\u1ec3, gi\u00fap t\u0103ng t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean nhi\u1ec5u (S\/N) v\u00e0 gi\u1ea3m thi\u1ec3u t\u00ecnh tr\u1ea1ng dropout – m\u1ea5t ti\u1ebfng \u0111\u1ed9t ng\u1ed9t \u1edf micro kh\u00f4ng d\u00e2y.<\/span><\/p>\n

\"\"Ngu\u1ed3n internet<\/span><\/i><\/p>\n

2. H\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i s\u00f3ng (Antenna Distribution System) \u2013 T\u1ed1i \u01b0u h\u00f3a k\u1ebft n\u1ed1i<\/b><\/h3>\n

Trong c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh s\u1eed d\u1ee5ng nhi\u1ec1u micro kh\u00f4ng d\u00e2y, l\u00e1 s\u00f3ng ch\u1ee7 \u0111\u1ed9ng th\u01b0\u1eddng \u0111i k\u00e8m v\u1edbi <\/span>h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i anten (ADS)<\/b>. <\/span><\/p>\n

Gi\u1ea3i ph\u00e1p n\u00e0y gi\u00fap:<\/span><\/p>\n