Room acoustics Flashcards

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1
Q

Intensity

A

Intensity = Power of source / (4 x pi x r squared)

If distance doubles, intensity decreases by 4x
If distance increases 10x, intensity decreases 100x

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2
Q

What three things happen to sound when encountering a barrier?

A

Reflection
Absorption
Transmission

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3
Q

Reflection

A

With smooth hard surface, 90-99% is reflected

Causes reverberations in the sound; different patterns are caused by size and shape of room, objects, and material on surfaces

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4
Q

Reverberation time

A

Overall measure of how long the reverberations last

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5
Q

Dry/dead rooms

A

Rooms with very short reverberation times

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6
Q

Live rooms

A

Rooms with long reverberation time

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7
Q

Warm room

A

Room with a long reverberation time for low frequencies

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8
Q

Absorption

A

Occurs when some of the sound energy is converted to heat in a material

Small fibers = increased absorption
–> sound waves cause fibers to move around; friction between the fibres converts the energy of the motion into heat

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9
Q

Transmission

A

Depends on mass of the barrier
–> more massive per area = less sound transmission, more reflection

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