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Amplitude shift keying changes the height/power of the transmitted signal without altering the frequency. Frequency shift keying changes the frequency of the transmission without altering the height/power of the transmitted signal. Morse code is an example of amplitude keying where the amplitude is 0 or 100%. RTTY teleprinter uses FSK with two frequencies and the codes that represent text characters are sent with patterns of the two frequencies.
Keying - official - was born on 1787-03-21.
Keying - official - died on 1858-06-29.
micxingthe between the phasr and frepaancy shift keying
Amplitude
PSK (Phase Shift Keying) is advantageous over FSK (Frequency Shift Keying) and ASK (Amplitude Shift Keying) because it provides higher data rates and better spectral efficiency. PSK is less susceptible to noise and interference since phase changes are more discernible than frequency or amplitude changes. PSK also allows for easier implementation in digital communication systems.
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The acronym "BPSK" stands for burst pulse shift keying. Burst pulse shift keying is the simplest form of phase shift keying or PSK known currently to exist.
differential phase-shift keying (′dif·ə′ren·chəl ′fāz ′shift ′kē·iŋ) (communications) Form of phase-shift keying in which the reference phase for a given keying interval is the phase of the signal during the preceding keying interval. Also known as differentially coherent phase-shift keying.Above retrieved from Answers.comViper1
The definition for "keying in" depends on the device being used. For telephones (including mobile phones), "keying in" information means using the numeric keypad to provide information (e.g., account number, spelling of last name, etc.). For calculators, "keying in" information means using the calculator keypad to enter numbers and execute operations on those values. For computers with a numeric keypad, "keying in" information means entering numbers into a particular program. For computers with a standard keyboard "keying in" information means typing in information.
Phase shift keying Quadrature shift keying
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