{"id":214705,"date":"2024-10-10T21:01:58","date_gmt":"2024-10-10T21:01:58","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/?p=214705"},"modified":"2024-10-10T21:01:58","modified_gmt":"2024-10-10T21:01:58","slug":"%e9%9b%bb%e7%a3%81%e6%b3%a2%e9%80%9a%e4%bf%a1%e3%82%b7%e3%82%b9%e3%83%86%e3%83%a0%e3%81%a7%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%82%8b%e3%81%95%e3%81%be%e3%81%96%e3%81%be%e3%81%aa%e5%a4%89%e8%aa%bf","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e9%9b%bb%e7%a3%81%e6%b3%a2%e9%80%9a%e4%bf%a1%e3%82%b7%e3%82%b9%e3%83%86%e3%83%a0%e3%81%a7%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%82%8b%e3%81%95%e3%81%be%e3%81%96%e3%81%be%e3%81%aa%e5%a4%89%e8%aa%bf\/","title":{"rendered":"\u96fb\u78c1\u6ce2\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u4f7f\u7528\u3055\u308c\u308b\u3055\u307e\u3056\u307e\u306a\u5909\u8abf\u6280\u8853\u3068\u306f\uff1f"},"content":{"rendered":"<p class=\"sidekick\">\u96fb\u78c1\u6ce2\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u4f7f\u7528\u3055\u308c\u308b\u5909\u8abf\u6280\u8853\u306b\u3064\u3044\u3066\u89e3\u8aac\u3002AM\u3001FM\u3001PM\u306a\u3069\u306e\u57fa\u672c\u7684\u306a\u5909\u8abf\u65b9\u6cd5\u3068\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u6027\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002<\/p>\n<h2>\u96fb\u78c1\u6ce2\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u4f7f\u7528\u3055\u308c\u308b\u3055\u307e\u3056\u307e\u306a\u5909\u8abf\u6280\u8853\u3068\u306f\uff1f<\/h2>\n<p>\u96fb\u78c1\u6ce2\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u79c1\u305f\u3061\u306e\u73fe\u4ee3\u306e\u751f\u6d3b\u306b\u4e0d\u53ef\u6b20\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001Wi-Fi\u3001\u30e9\u30b8\u30aa\u306a\u3069\u3001\u3053\u308c\u3089\u306e\u30b7\u30b9\u30c6\u30e0\u306f\u60c5\u5831\u3092\u8fc5\u901f\u304b\u3064\u6b63\u78ba\u306b\u9001\u53d7\u4fe1\u3059\u308b\u305f\u3081\u306b\u3001\u3055\u307e\u3056\u307e\u306a\u5909\u8abf\u6280\u8853\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u6587\u66f8\u3067\u306f\u3001\u4e00\u822c\u7684\u306a\u5909\u8abf\u6280\u8853\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h2>\u632f\u5e45\u5909\u8abf (Amplitude Modulation, AM)<\/h2>\n<p>\u632f\u5e45\u5909\u8abf\uff08AM\uff09\u306f\u3001\u642c\u9001\u6ce2\u306e\u632f\u5e45\u3092\u5909\u5316\u3055\u305b\u3066\u4fe1\u53f7\u3092\u9001\u308b\u53e4\u5178\u7684\u306a\u65b9\u6cd5\u3067\u3059\u3002AM\u306f\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n<u>\u57fa\u672c\u5f0f\uff1a<\/u><br \/>\n\\[<br \/>\ns(t) = [A + m(t)] \\cos(2 \\pi f_c t)<br \/>\n\\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001s(t)\u306f\u5909\u8abf\u4fe1\u53f7\u3001A\u306f\u30ad\u30e3\u30ea\u30a2\u306e\u632f\u5e45\u3001m(t)\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u4fe1\u53f7\u3001f_c\u306f\u30ad\u30e3\u30ea\u30a2\u5468\u6ce2\u6570\u3067\u3059\u3002AM\u306f\u30e9\u30b8\u30aa\u653e\u9001\u306a\u3069\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u30ce\u30a4\u30ba\u306e\u5f71\u97ff\u3092\u53d7\u3051\u3084\u3059\u3044\u3068\u3044\u3046\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u5468\u6ce2\u6570\u5909\u8abf (Frequency Modulation, FM)<\/h2>\n<p>\u5468\u6ce2\u6570\u5909\u8abf\uff08FM\uff09\u306f\u3001\u642c\u9001\u6ce2\u306e\u5468\u6ce2\u6570\u3092\u5909\u5316\u3055\u305b\u3066\u4fe1\u53f7\u3092\u9001\u308a\u307e\u3059\u3002FM\u5909\u8abf\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n<u>\u57fa\u672c\u5f0f\uff1a<\/u><br \/>\n\\[<br \/>\ns(t) = A \\cos\\left[2 \\pi \\left(f_c + k_f m(t)\\right) t\\right]<br \/>\n\\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001k_f\u306f\u5468\u6ce2\u6570\u5909\u8abf\u6307\u6570\u3067\u3059\u3002FM\u306fAM\u3088\u308a\u3082\u30ce\u30a4\u30ba\u8010\u6027\u306b\u512a\u308c\u3066\u304a\u308a\u3001\u9ad8\u54c1\u8cea\u306e\u97f3\u58f0\u4fe1\u53f7\u3092\u4f1d\u3048\u308b\u305f\u3081\u306b\u30e9\u30b8\u30aa\u3068\u30c6\u30ec\u30d3\u653e\u9001\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u4f4d\u76f8\u5909\u8abf (Phase Modulation, PM)<\/h2>\n<p>\u4f4d\u76f8\u5909\u8abf\uff08PM\uff09\u306f\u3001\u642c\u9001\u6ce2\u306e\u4f4d\u76f8\u3092\u5909\u5316\u3055\u305b\u3066\u4fe1\u53f7\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002PM\u306f\u6b21\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n<u>\u57fa\u672c\u5f0f\uff1a<\/u><br \/>\n\\[<br \/>\ns(t) = A \\cos\\left[2 \\pi f_c t + k_p m(t)\\right]<br \/>\n\\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001k_p\u306f\u4f4d\u76f8\u5909\u8abf\u6307\u6570\u3067\u3059\u3002PM\u306fFM\u306b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u4fe1\u53f7m(t)\u304c\u4f4d\u76f8\u3092\u5909\u66f4\u3059\u308b\u70b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u30c7\u30b8\u30bf\u30eb\u901a\u4fe1\u3067\u306f\u3001PSK\uff08Phase Shift Keying\uff09\u3068\u3044\u3046\u6280\u8853\u304c\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30c7\u30b8\u30bf\u30eb\u5909\u8abf\u6280\u8853<\/h2>\n<p>\u30a2\u30ca\u30ed\u30b0\u5909\u8abf\u306b\u52a0\u3048\u3066\u3001\u30c7\u30b8\u30bf\u30eb\u901a\u4fe1\u3067\u306f\u3044\u304f\u3064\u304b\u306e\u30c7\u30b8\u30bf\u30eb\u5909\u8abf\u6280\u8853\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u305d\u306e\u4ee3\u8868\u7684\u306a\u3082\u306e\u3067\u3059\uff1a<\/p>\n<ul>\n<li><strong>ASK (Amplitude Shift Keying)\uff1a<\/strong> \u632f\u5e45\u306e\u5909\u5316\u3092\u5229\u7528\u3057\u3066\u30c7\u30b8\u30bf\u30eb\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<li><strong>FSK (Frequency Shift Keying)\uff1a<\/strong> \u5468\u6ce2\u6570\u306e\u5909\u5316\u3092\u5229\u7528\u3057\u3066\u30c7\u30b8\u30bf\u30eb\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<li><strong>PSK (Phase Shift Keying)\uff1a<\/strong> \u4f4d\u76f8\u306e\u5909\u5316\u3092\u5229\u7528\u3057\u3066\u30c7\u30b8\u30bf\u30eb\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<li><strong>QAM (Quadrature Amplitude Modulation)\uff1a<\/strong> \u632f\u5e45\u3068\u4f4d\u76f8\u306e\u4e21\u65b9\u3092\u5909\u5316\u3055\u305b\u3066\u30c7\u30b8\u30bf\u30eb\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>QAM\u306f\u3001\u7279\u306b\u9ad8\u901f\u30c7\u30fc\u30bf\u901a\u4fe1\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3001Wi-Fi\u3084\u643a\u5e2f\u96fb\u8a71\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u96fb\u78c1\u6ce2\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3055\u307e\u3056\u307e\u306a\u5909\u8abf\u6280\u8853\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u76ee\u7684\u3084\u8981\u6c42\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u5909\u8abf\u6280\u8853\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u304b\u3064\u78ba\u5b9f\u306a\u901a\u4fe1\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u73fe\u4ee3\u306e\u901a\u4fe1\u6280\u8853\u306f\u3053\u308c\u3089\u306e\u57fa\u790e\u306b\u57fa\u3065\u3044\u3066\u767a\u5c55\u3057\u3066\u304a\u308a\u3001\u79c1\u305f\u3061\u306e\u751f\u6d3b\u306b\u6b20\u304b\u305b\u306a\u3044\u30b5\u30fc\u30d3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u96fb\u78c1\u6ce2\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u4f7f\u7528\u3055\u308c\u308b\u5909\u8abf\u6280\u8853\u306b\u3064\u3044\u3066\u89e3\u8aac\u3002AM\u3001FM\u3001PM\u306a\u3069\u306e\u57fa\u672c\u7684\u306a\u5909\u8abf\u65b9\u6cd5\u3068\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u6027\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[102],"tags":[],"class_list":["post-214705","post","type-post","status-publish","format-standard","hentry","category-102","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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