modulaatiotapa
Modulaatiotapa refers to the method used to convey information on a carrier wave by altering one or more of its physical properties. It is a central concept in communications engineering and is commonly divided into analog and digital categories. Analog modulation modifies continuous signals, with amplitude modulation (AM) varying the carrier amplitude, frequency modulation (FM) varying the carrier frequency, and phase modulation (PM) varying the carrier phase. Digital modulation encodes information in discrete symbols, including amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK), as well as higher-order schemes like quadrature amplitude modulation (QAM) that combine amplitude and phase changes to increase data rates.
In evaluating a modulaatiotapa, engineers consider factors such as bandwidth requirements, power efficiency, robustness to noise,
Common applications span radio broadcasting, television transmission, mobile and satellite communications, and data networks. In modern
See also Modulation, Digital modulation, Analog modulation, Carrier wave.