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Middle Ear

Middle Ear. Acoustic energy. 99.9%. Net loss = 40-55 dB. P 1. P 2. A 1. A 2. Impedance Matching. TM >>> Oval window. Areal Ratio F=P 1 A 1 =P 2 A 2 therefore P 2 /P 1 =A 1 /A 2. P 1. P 2. A 1. A 2. L 1. L 2. Impedance Matching.

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Middle Ear

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  1. Middle Ear

  2. Acoustic energy 99.9% Net loss = 40-55 dB

  3. P1 P2 A1 A2 Impedance Matching TM>>>Ovalwindow • Areal RatioF=P1A1=P2A2 therefore P2/P1=A1/A2

  4. P1 P2 A1 A2 L1 L2 Impedance Matching • Areal RatioF=P1A1=P2A2 therefore P2/P1=A1/A2 Malleus>Incus • Lever RatioL1/F1=F2/L2

  5. P1 P2 A1 A2 L1 L2 Impedance Matching • Areal RatioF=P1A1=P2A2 therefore P2/P1=A1/A2 • BucklingAction • Lever RatioL1/F1=F2/L2

  6. Acoustic Impedance Resonance frequencyaffects intensity during sound transmission

  7. Acoustic Impedance Also criticial in the cochlea STIFFNESS LimitsLow frequency LimitsHigh frequency MASS

  8. Transfer Functions Volume of middle ear space Mass of ossicles

  9. Transfer Functions

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