2.43 beats. Periodic variations that result from the superposition of two sinusoidal quantities of different frequencies, f1 and f2. Beats involve the periodic increase and decrease of amplitude at the beat frequency, (f1 –f2), where f1 is greater...
2.42 modulation. Variation of some parameter characterizing a periodic oscillation. Thus amplitude modulation of a sinusoidal oscillation is a variation in the amplitude of the sinusoidal...
2.41 echo. Wave that has been reflected or otherwise returned with sufficient magnitude and delay to be detectable as a wave distinct from that directly transmitted. Annotation...
2.40 reverberation. Sound that persists as a result of repeated reflection or scattering after the sound source has stopped. Annotation Repeated reflections of residual sound in an enclosure can alternatively be described in terms of the...
2.39 pseudo-random noise. A noise with random properties but synthesized in accordance with defined mathematical parameters and therefore predictable and not random. Abbreviation: PRN. Annotation 1 A noise...
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