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frequency modulation
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encoding of information in a carrier wave by varying the instantaneous frequency of the wave
Frequency modulation is a way to encode information—like music or voice—by varying how fast a carrier wave oscillates up and down. This technique matters because it allows us to transmit information through the air or over cables in a form that can be reliably received and decoded.
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A signal may be carried by an AM or FM radio wave. FM has better noise (RFI) rejection than AM, as shown in this dramatic New York publicity demonstration by General Electric in 1940. The radio has both AM and FM receivers. With a million-volt electric arc as a source of interference behind it, the AM receiver produced only a roar of static, while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter W2XMN in New Jersey.
Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In frequency modulation a carrier wave is varied in its instantaneous frequency in proportion to a property, primarily the instantaneous amplitude, of a message signal, such as an audio signal. The technology is used in telecommunications, radio broadcasting, signal processing, and computing.