spurious modulation

spurious modulation

[′spyu̇r·ē·əs ‚mäj·ə′lā·shən]
(electronics)
Undesired modulation occurring in an oscillator, such as frequency modulation caused by mechanical vibration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Measurements include output level accuracy, carrier frequency accuracy, setting accuracy of modulation depth and deviation, weighted and unweighted spurious modulation, and modulation frequency response, distortion and frequency.
Phase steps, shown in Figure 4, cause spurious modulation products and increased phase noise.
Amplification often has the unfortunate side-effect of introducing artifacts, spurious modulations. These modulations can alert a radar operator or a microprocessor to the presence of an amplified or altered signal.