Throughout the communication process, the message is subject to extraneous factors that can distort or interfere with its reception. This unplanned distortion or interference is known as noise. Errors or problems that occur in the encoding of the message, distortion in a radio or television signal, or distractions at the point of reception are examples of noise. When you are watching your favorite commercial on TV and a problem occurs in the signal transmission, it will obviously interfere with your reception, lessening the impact of the commercial.
Noise may also occur because the fields of experience of the sender and receiver don't overlap. Lack of common ground may result in improper encoding of the message—using a sign, symbol, or words that are unfamiliar or have different meaning to the receiver. The more common ground there is between the sender and the receiver, the less likely it is this type of noise will occur.
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