sound is made by longitudinal waves and transverse waves.
Echos – sound waves reflecting and hitting of hard surfaces to bounce back.
longitudinal wave: a wave vibrating in the direction of propagation.
transverse waves: a wave in which the medium vibrates at right angles to the direction of its propagation.
the range of hearing frequency is 20 hz to 20 khz.
key words:
Delay
Reverb(eration)
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