ACOUSTIC IMPEDANCE CHANGE STRUCTURE AND AIR PASSAGE TYPE SILENCER
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United States of America Patent
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Issued Date -
Jan 4, 2024
app pub date -
Sep 18, 2023
filing date -
Mar 25, 2021
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Abstract
To provide an air passage type silencer and an acoustic impedance change structure of which the absorbance is high, that suppresses generation of a wind noise, and that has a high sound attenuation effect in a low-frequency band. Provided is an acoustic impedance change structure through which a sound propagates, the acoustic impedance change structure including at least in this order: a first impedance matching region that is connected to an inlet portion and in which an acoustic impedance gradually decreases; an acoustic impedance constancy region; and an outlet portion, in which Zcham
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