amplitude modulation

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amplitude modulation

Altering the height (amplitude) of an electrical or acoustical wave.
See: A-mode ultrasound
References in periodicals archive ?
Laser doppler imaging uses two sets of amplitude modulated lasers, operating at two separate wavelengths, that scan across the conveyor belt.
The performance of an amplitude modulated communication system degrades with the magnitude of the external noise, and they have limited bandwidth.
This option also gives the unit an envelope function that helps analyze bearing and gear faults that have been amplitude modulated, allowing the unit to be used as a tool for predictive maintenance programs, not only for data trending, but for actual analysis as well.
A second instrument, the pulse amplitude modulated fluorometer, measures how much light is fluoresced by algae cells, which allows researchers to estimate how healthy the algae are.
Other jamming sources covered by the program include continuous wave (CW), swept CW, pulsed CW, amplitude modulated CW, phase shift keying pseudonoise (with a 20-MHz bandwidth) and both narrow-band and wideband frequency modulated signals.
This process is basically independent of the modulation content of the desired carrier; analog amplitude modulated (AM), frequency modulated (FM), digital frequency shift keying (FSK) or quadrature phase shift keying (QPSK).
Extensive Time Code Generation and Translation - IRIG A, B, G, E, IEEE 1344, NASA 36, XR3 or 2137 in both amplitude modulated (AM) and DC level shift formats supported; over 30 input and output time code variations are supported with the ability to do them in parallel between AM and DCLS

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