amplitude modulation meaning

Noun: amplitude modulation  'ampli`t(y)ood `móju'leyshun

1. Modulation of the amplitude of the (radio) carrier wave
   - AM

Derived forms: amplitude modulations

Type of: modulation

Encyclopedia: Amplitude modulation

[Electronics]
Abbreviation, AM. A method of conveying intelligence in wireless com-
munications and broadcasting. The modulating-signal energy appears at sideband frequencies above and below, and very close to, the carrier frequency. These sideband signals carry all the information. The extent of modulation is expressed as a percentage, from 0, which represents an unmodulated carrier, to 100, which represents full modulation. In a signal modulated 100 percent, one-third of the power is used to convey the data; the other two-thirds is consumed by the carrier. This form of modulation is essentially outmoded, although it is still used in the standard broadcast band from 535 to 1605 kHz. See FREQUENCY MODULATION, PHASE MODULATION, SINGLE SIDEBAND.




amplitude-modulation noise Spurious amplitude modulation of a carrier wave by extraneous signals and random impulses, rather than by the intended data-containing signal.

[Computer]
<communications> (AM) A method of encoding data by varying the amplitude of a constant frequency carrier.

Contrast Frequency Modulation.

Examples

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1. using ewb to simulate amplitude modulation and detection
2. companding single sideband amplitude modulation cssb am
3. telephony using amplitude modulation single sideband full carrier
4. amplitude modulation and demodulation circuit
5. vsb-am estigial sideband-amplitude modulation