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1 The third sound was described as a loud, crisp tapping sound. 2  The fourth sound, at pressures within 10 mmHg above the diastolic blood pressure, was described as thumping and muting. 3  The fifth Korotkoff sound is silent as the cuff pressure drops below the diastolic blood pressure.orotkoff sounds are the sounds that medical personnel listen for when they are taking blood pressure using a non-invasive procedure.
How is pitch or frequency determined? Range of hearing: 20-20,000 Hz. Range in volume 10 6! Sound processing is very complex and involves positive feedback. Feedback enhances sensitivity, but can go above one and ear starts vibrating by itself. The ear actually produces a tone â this is the ringing in your ear. 1  Basilar membrane resonates when a sounds wave enters: Different parts resonate at different frequencies. 2  Resonant frequencies are spaced logarithmically â like a piano. 3  A single input frequency can activate a range of nerves on the Basilar membrane: