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...

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

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

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

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

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...

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...

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...

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-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-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-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...

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...

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...

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

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

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

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

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

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

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

The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its...

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

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...

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...

Energy may use a UART interface. There are several types of digital signal modulation methods commonly used in RF transmitter and receiver modules: ASK...

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

RFID and Bluetooth communication. Any digital modulation scheme uses a finite number of distinct signals to represent digital data. PSK uses a finite number...

the baseband signal. The presence of filters may perform pulse shaping. Some systems then use modulation to multiplex many baseband signals into a broadband...

technologies typically refer to physical layer protocol duties such as modulation, demodulation, line coding, equalization, error control, bit synchronization...