form of the modulation or message signal onto a carrier signal to be transmitted. For example, the message signal might be an audio signal representing...

Phase modulation (PM) is a signal modulation method for conditioning communication signals for transmission. It encodes a message signal as variations...

Amplitude modulation (AM) is a signal modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave...

Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In...

communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of signal modulation used to transmit information...

Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), is any method of representing a signal as a rectangular...

modulation (analog PM) and phase-shift keying (digital PSK) can be regarded as a special case of QAM, where the amplitude of the transmitted signal is...

Delta-sigma (ΔΣ; or sigma-delta, ΣΔ) modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency...

Pulse-amplitude modulation (PAM) is a form of signal modulation in which the message information is encoded in the amplitude of a pulse train interrupting...

Pulse-code modulation (PCM) is a method used to digitally represent analog signals. It is the standard form of digital audio in computers, compact discs...

Pulse-density modulation (PDM) is a form of modulation used to represent an analog signal with a binary signal. In a PDM signal, specific amplitude values...

Differential pulse-code modulation (DPCM) is a signal encoder that uses the baseline of pulse-code modulation (PCM) but adds some functionalities based...

Delta modulation (DM, ΔM, or Δ-modulation) is an analog-to-digital and digital-to-analog signal conversion technique used for transmission of voice information...

Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of 2 M {\displaystyle...

ring modulation is a signal processing function, an implementation of frequency mixing, in which two signals are combined to yield an output signal. One...

self-oscillating modulation.) or discrete-time forms of modulation such as delta-sigma modulation. A simple means of creating the PWM signal is to use a high-speed...

the signal modulation from frequency-shift keying (FSK) to amplitude modulation (AM). In a facsimile transmitter, a device that changes the signal modulation...

of signal modulation, and there are many types of demodulators. The signal output from a demodulator may represent sound (an analog audio signal), images...

Angle modulation is a class of signal modulation that is used in telecommunication transmission systems using carrier waves. The class comprises frequency...

information bearing signal, called the message signal or modulation signal. The carrier frequency is usually much higher than the message signal frequency because...

have a harmonic relationship to the original carrier signal. As the amount of frequency modulation increases, the sound grows progressively complex. Through...

transform performs well in image processing, filter design, signal sampling, modulation, demodulation, speech processing, and biomedical engineering...

signal into vibrations in the crystal to create an image. A rapidly rotating polygonal mirror gives the laser beam the horizontal refresh modulation....

that the modulations in some signal can be treated separately from the carrier wave of the signal. This has extensive use in many radio and signal processing...

Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams...

Stochastic Signal Density Modulation (SSDM) is a novel power modulation technique primarily used for LED power control. The information is encoded - or...

requiring that the input signal of the power amplifier be "constant envelope", i.e. contain no amplitude variations. In a polar modulation system, the power...

Adaptive differential pulse-code modulation (ADPCM) is a variant of differential pulse-code modulation (DPCM) that varies the size of the quantization...

Mechanically induced modulation is an optical signal modulation induced by mechanical means. An example of deleterious mechanically induced modulation is speckle...

propagation. Each subcarrier (signal) is modulated with a conventional modulation scheme (such as quadrature amplitude modulation or phase-shift keying) at...