Amplitude-shift keying vs Frequency-shift keying

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Frequency-Shift Keying (FSK) and Amplitude-Shift Keying (ASK) are both methods of modulating a signal to encode data, commonly used in digital communication systems. Here's a comparison table highlighting their similarities and differences.

Comparison chart

Amplitude-shift keying versus Frequency-shift keying comparison chart
	Amplitude-shift keying	Frequency-shift keying
Introduction (from Wikipedia)	Amplitude-shift keying is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave.	Frequency-shift keying is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.
Definition	ASK is a modulation technique where the amplitude of the carrier signal is varied in line with the digital signal data.	FSK is a modulation technique where the frequency of the carrier signal is varied in accordance with the digital signal data.
Signal parameter varied	Amplitude of the carrier signal.	Frequency of the carrier signal.
Bandwidth	ASK is generally more bandwidth-efficient than FSK.	FSK typically requires a broader bandwidth compared to ASK.
Susceptibility to Noise	ASK is more susceptible to noise and signal attenuation, which can affect its reliability.	FSK is less susceptible to noise and distortion, making it more reliable in certain environments.
Power Efficiency	ASK is more power-efficient as it involves less frequent changes in the signal state.	FSK is less power-efficient compared to ASK, due to its more complex modulation technique.
Data Transmission Rate	ASK allows for a higher data rate as it permits more rapid changes in the signal.	FSK typically has a lower data rate due to increased bandwidth requirements and complexity.
Complexity	ASK is simpler in comparison to FSK due to its modulation technique.	FSK is generally more complex than ASK because of the way it varies the frequency of the carrier signal.
Cost and Implementation	Implementing ASK is simpler and less costly due to its simpler circuitry.	Implementing FSK is typically more expensive and complex because of its frequency variation requirements.
Application Examples	ASK is often used in applications like optical fiber communication and low-frequency radio transmissions.	FSK is commonly used in radio transmissions, dial-up modems, and RFID systems due to its robustness.

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