Sound transmission to inner ear

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Sound transmission to inner ear Sound transmission to inner ear Impedance mismatch between air in middle ear and Impedance mismatch between air in middle ear and fluid in inner ear fluid in inner ear To compensate: To compensate: Area difference between TM and footplate of the stapes Area difference between TM and footplate of the stapes (55/3.2 = 17) (55/3.2 = 17) Ossicular lever action (1.3/1 = 1.3) Ossicular lever action (1.3/1 = 1.3) Buckling movement of TM (2/1 = 2) Buckling movement of TM (2/1 = 2) Total pressure increase = 17 * 1.3 * 2 = 44.2 Total pressure increase = 17 * 1.3 * 2 = 44.2 Total dB increase = 33 dB Total dB increase = 33 dB

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Sound transmission to inner ear. Impedance mismatch between air in middle ear and fluid in inner ear To compensate: Area difference between TM and footplate of the stapes (55/3.2 = 17) Ossicular lever action (1.3/1 = 1.3) Buckling movement of TM (2/1 = 2) - PowerPoint PPT Presentation

Transcript of Sound transmission to inner ear

Page 1: Sound transmission to inner ear

Sound transmission to inner earSound transmission to inner ear Impedance mismatch between air in middle ear and Impedance mismatch between air in middle ear and

fluid in inner earfluid in inner ear

To compensate:To compensate:

Area difference between TM and footplate of the stapes (55/3.2 Area difference between TM and footplate of the stapes (55/3.2 = 17)= 17)

Ossicular lever action (1.3/1 = 1.3)Ossicular lever action (1.3/1 = 1.3)

Buckling movement of TM (2/1 = 2)Buckling movement of TM (2/1 = 2)

Total pressure increase = 17 * 1.3 * 2 = 44.2 Total pressure increase = 17 * 1.3 * 2 = 44.2

Total dB increase = 33 dBTotal dB increase = 33 dB

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