amplitude modulation

(redirected from Amplitude modulated)
Also found in: Dictionary, Thesaurus, Encyclopedia.

amplitude modulation

Altering the height (amplitude) of an electrical or acoustical wave.
See: A-mode ultrasound
References in periodicals archive ?
In this paper, we describe a numerical study in the focal region of incident, partially coherent, radially polarized vortex beam based on vector diffraction theory that is tightly focused by a combination of proposed amplitude modulated filter and a high NA lens [13].
Instrumentation The IFC equipment used for all applications was the pulse generator--Endophasys/KLD Biosistemas with a carrier frequency of 4.000 Hz, an amplitude modulated frequency (AMF) equal to 75 Hz, a variation frequency (AF) of 35 Hz, and a slope of 1/1.
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).
The probe consists of the light emitter, which generates amplitude modulated optical code sequence, and light receiver.

Full browser ?