Labels:monitor OCR: Because of na tural properties of the human ear's mechanism 11 is less senstive low frequencies than high ones sound's amplitude must be incre ased its frequency is lowered to re tain fixed apparent lou dness By way of illustra tion + cone moves mm at 150 Hz, 1f would have move 220mm ou) kidding!) produce 30 Hz signal at the same apparent level.
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