Reactance (X)

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Reactance (X)

• Two components
• Due to mass (Xm)
• Greatest at high frequencies
• Due to stiffness (Xs)
• Greatest at low frequencies

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Total Impedance

• Z
• Impedance of a medium Characteristic impedance

R2 (Xm Xs)2
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Sound traveling from one medium to another

• Depending on the impedance of the two media
• Reflection
• Transmission
• Absorption

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Reverberation

• Depends on absorption and volume.
• Greater the volume Greater the reverberation
• Greater the absorption Lesser the
  reverberation
• Reverberation time (RT) Time taken for a sound
  to reach some proportion of its original pressure.

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Interactions between incident (original) and
reflected waves

• Constructive interference or reinforcement
• Destructive interference or cancellation