Modulation Guide, Meaning , Facts, Information and Description
For the musical use of "modulation", see modulation (music).
Modulation describes a range of techniques for encoding information on a carrier signal, typically a sine-wave signal. A device that performs modulation is known as a modulator.
Modulation techniques include:
- Amplitude modulation (AM)
- Phase modulation (PM, includes BPSK, QPSK, etc.)
- Frequency modulation (FM)
- Single-sideband modulation (SSB)
- Vestigial-sideband modulation (VSB, or VSB-AM)
- Quadrature amplitude modulation (QAM)
- Orthogonal frequency division modulation (OFDM), also known as 'Discrete multitone modulation' (DMT)
- Wavelet modulation
- Trellis modulation
- Adaptive modulation
- Sigma-delta modulation (∑Δ)
Pulse modulation techniques include:
- Pulse-code modulation (PCM)
- Pulse-width modulation (PWM)
- Pulse-amplitude modulation (PAM)
- Pulse-position modulation (PPM)
- Pulse-density modulation (PDM)
- Frequency-shift keying (FSK) see Frequency modulation
- Phase-shift keying (PSK) see Phase modulation
- Gaussian Minimum Shift Keying (GMSK)
Where Morse code is used to turn the carrier wave on and off, the term used is not 'amplitude keying', but 'continuous wave' (CW) operation.
Modulation is frequently used in conjunction with various channel access methods.
See also:
- Types of radio emissions
- Communications channel
- Channel coding
- Telecommunication
- Modem
- RF modulator
- Codec
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