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  2. Frequency modulation - Wikipedia

    en.wikipedia.org/wiki/Frequency_modulation

    Frequency modulation ( FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing . In analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the ...

  3. Emphasis (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Emphasis_(telecommunications)

    Emphasis (telecommunications) RIAA equalization curve for vinyl records. In signal processing, pre-emphasis is a technique to protect against anticipated noise and loss. The idea is to boost (and hence distort) the frequency range that is most susceptible to noise and loss beforehand, so that after a noisy and lossy process (transmission over ...

  4. Angle modulation - Wikipedia

    en.wikipedia.org/wiki/Angle_modulation

    Angle modulation is a class of carrier modulation that is used in telecommunications transmission systems. The class comprises frequency modulation (FM) and phase modulation (PM), and is based on altering the frequency or the phase, respectively, of a carrier signal to encode the message signal. This contrasts with varying the amplitude of the ...

  5. Phase modulation - Wikipedia

    en.wikipedia.org/wiki/Phase_modulation

    e. Phase modulation ( PM) is a modulation pattern for conditioning communication signals for transmission. It encodes a message signal as variations in the instantaneous phase of a carrier wave. Phase modulation is one of the two principal forms of angle modulation, together with frequency modulation . In phase modulation, the instantaneous ...

  6. Modulation - Wikipedia

    en.wikipedia.org/wiki/Modulation

    In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. [ 1] For example, the modulation signal might be an audio signal representing sound from ...

  7. Frequency modulation synthesis - Wikipedia

    en.wikipedia.org/wiki/Frequency_modulation_synthesis

    Frequency modulation synthesis (or FM synthesis) is a form of sound synthesis whereby the frequency of a waveform is changed by modulating its frequency with a modulator. The (instantaneous) frequency of an oscillator is altered in accordance with the amplitude of a modulating signal. [1] FM synthesis can create both harmonic and inharmonic sounds.

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