amplitude modulation


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Related to amplitude modulation: phase modulation, frequency modulation

amplitude modulation

Altering the height (amplitude) of an electrical or acoustical wave.
See: A-mode ultrasound
References in periodicals archive ?
Nevertheless, the PS-PWM technique leads to extra dv/dts in the output line-to-line voltages especially at low amplitude modulation term ([m.sub.a]) values [15].
Both works conclude that the damage index based on the amplitude modulation is better than the one based on the frequency modulation.
Figure 19 shows the results for the tests with amplitude modulation index, [m.sub.a] = 0.3, and frequency modulation index, [m.sub.f] = 20.
When the proximity cards inductive coupled with readers execute their operations, the variations in the internal power consumption of the proximity cards cause physical changes such as EM radiation from the chip surface and amplitude modulation of a carrier field of the reader inductive coupled with the proximity card.
Additionally, the BigBand BMR provides QAM (quadrature amplitude modulation), which is designed to efficiently deliver digital video programming with compatibility to subscribers' access devices.
The products are also unique because they support two different network architectures within the same device, providing service providers with a choice in way they can deliver digital video services into the home: The first supported is the tradition al quadrature amplitude modulation (QAM) method commonly used today by cable operators, which sends video information to the home over radio frequencies.
The phase control and amplitude modulation of separated oscillatory fields are discussed for the measurement of the T-odd correlation term.
Chapter 13 includes the fundamentals of frequency-division multiplexing, amplitude modulation, radio frequency detection, frequency modulated signals and mixer circuits.
For AM signals, the percentage of amplitude modulation is normally specified, and for FM signals, the modulation index is commonly specified.
The NXT2004 VSB/QAM (vestigial side band/quadrature amplitude modulation) Receiver is designed for a variety of applications including off-air and digital cable television receivers, set-top boxes, PCDTV and datacast applications where cost, low power and industry leading performance are a must.
Techniques for modulating UWB pulses include Pulse Position Modulation and Pulse Amplitude Modulation. The more common approach of PPM, for instance, might assign a digital representation of 0 or 1 to the transmitted and received pulse based on where, in time, the pulse is placed.
Microwave and radio-frequency (electromagnetic wave energy) heating utilize magnetron systems with on/off time-proportioning control or amplitude modulation. Meet safety standards and FCC regulations.

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