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12 Cards in this Set

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Infrasonic
describe a sound that has a frequency too low to be heard by the normal human ear; below 20 hertz
ultrasonic
describes a sound that has a frequency too high to be heard by the normal human ear; above 20 kiloherz
compression
condensed region of the medium through which a longitudinal wave travels
rarefaction
a rarefied region, or region of lessened pressure, of the medium through which a longitudinal wave travels
forced vibration
the setting up of vibrations in an object by a vibrating force
Natural frequency
A frequency at which an elastic object naturally tends to vibrate if it is distrubed and the disturbing force is removed.
Resonance
The response of a body when a forcing frequency matches its natural frequency.
Beats
A series of alternate reinforcements and cancellations produced by the itnerference of two waves of slightly different frequencies, heard as a throbbing effect in sound waves.
Carrier Wave
A wave , usually of radio frequency, whose characteristics are modified in the process of modulation
Modulation
the process of impression one wave system upon another of higher frequency
amplitude modulation (AM)
A type of modulation in which the amplitude of the carrier wave is varied above and below its normal value by an amount proportional to the amplitude of the impressed signal
Frequency modulation (FM)
A type of modulation in which the frequency of the carrier wave is varied above and below its normal frequency by an amount that is proportional to the amplitude of the impressed signal. In this case, the amplitude of the modulated carrier wave remains constant.