{"id":2810,"date":"2024-08-12T18:06:01","date_gmt":"2024-08-12T12:36:01","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=2810"},"modified":"2025-07-16T15:27:49","modified_gmt":"2025-07-16T09:57:49","slug":"noise","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ec\/communication-systems\/noise","title":{"rendered":"Noise"},"content":{"rendered":"

Noise may be defined, in electrical terms, as any unwanted introduction of energy tending to interfere with the proper reception and reproduction of transmitted signals. with the proper reception and reproduction of transmitted signals Many disturbances of an electrical nature produce noise in receivers, modifying the signal in an unwanted manner. In radio receivers, noise may produce hiss in the loudspeaker output. In television receivers \u201csnow\u201d or\u00a0 \u201cconfetti\u201d (colored snow) becomes superimposed on the picture. Noise can limit the range of the systems, for a given transmitted power. It affects the sensitivity of receivers, by placing a limit on the weakest signals that can be amplified. It may sometimes even force reduction in the bandwidth of a system. There are numerous ways of classifying noise.\"Source<\/p>\n

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  1. Due to sparking of brushes in electrical machinery<\/li>\n
  2. Thunder and lightening<\/li>\n
  3. Sparking of plugs in automobiles<\/li>\n
  4. Circuit noise internal in the system<\/li>\n
  5. Make-break of switches and relays<\/li>\n
  6. Due to fading<\/li>\n
  7. Hiss type sound in output of loudspeaker<\/li>\n<\/ol>\n

    Noise effects are of two types:<\/h2>\n

    Additive Noise:<\/strong> When noise is added with signal.
    \ni.e. S + N \u2192 signal deteriorates.<\/p>\n

    Fading:<\/strong> When noise is multiplied with signal.
    \ni.e. S \u00d7 N \u2192 signal deteriorates due to fading.<\/p>\n

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