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To make music performances more lively, singers use tremolo and
string players use vibrato. Both tremolo and vibrato are modulations of
the main tone with a much smaller frequency.
Tremolo is an amplitude modulation and it is achieved by periodic
varying (modulating) the air throughput through voice bands. The player
below illustrates tremolo of different modulation amplitudes A
and frequencies f. The frequency of the main tone is 500 Hz.
Tremolo
Note that setting A=1 (the maximal value here) and low f results in beats.
Vibrato is a frequency modulation that is achieved by changing the
string tension by pressing the fingers in this or that direction along
the string. The player below illustrates vibrato of different modulation
amplitudes A and frequencies f. The frequency of the main tone is
again 500 Hz.
Vibrato
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