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36 Cards in this Set
- Front
- Back
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3 situation of accoustic
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Source
Path Reciever |
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STC value of a partition HW, 3 out of 5 speech privacy consideration
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Speech effort
Privacy allowance Room background noise |
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air handler mount
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Inertia pad - heavy base supported by spring which motor is mounted on
Duct isolator- portion of the ductwork Isolation spring- underneath inertia pad, springs that attach btween building and the inertia pad |
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to make the sound level i a room perceived to be half as loud means a reduction of about
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10dB
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3 situation of accoustic
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Source
Path Reciever |
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STC value of a partition HW, 3 out of 5 speech privacy consideration
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Speech effort
Privacy allowance Room background noise |
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Describe the operation of a volume sound absorber
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N/A
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air handler mount
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Inertia pad - heavy base supported by spring which motor is mounted on
Duct isolator- portion of the ductwork Isolation spring- underneath inertia pad, springs that attach btween building and the inertia pad |
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to make the sound level i a room perceived to be half as loud means a reduction of about
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10dB
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This rating is the average absorption coefficient of four mid-range frequencies.
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NRC
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IIC
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Impact Isolation Class
the rating of how well the floors and walls handle isolation impact |
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STC
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sound transmission coefficient
the rate of transmition through floors and walls |
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NC
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Noise Criterium
The noise level in a room |
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NRC
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Noise Reduction Coeffecient
a scaler of the amount of sound energy got absorpt when the sound hits a surface. 0 perfect REFLECTIOn, 1 perfect ABSORPTION |
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Sabin
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One square meter of 100% absorbing material (NRC=1) has a value of one metric Sabin
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Shape of reflector directly above a lecturer
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Convex
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Rt 1= 1s
NRC remains the same V0=1 V1=2 Rt = ? when V1=2? |
2s
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double the absorption, ?db drops?
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3
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which room condition result in the greatest noise reduction
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dead
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perceptual response to frequency
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pitch
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outdoor condition, point sound source produces 100db at 100 ft, what at 25 ft
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112
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distance that can be determined as an echo
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50 ft
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dead lecture hall Rt
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0.1s
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absorption coefficient as 0, it is a perfect sound
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reflector
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Defussion
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convex
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focusing
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concave
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creep
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curve surface creeps
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standing wave
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wave length matchs two PARELLEL walls' distance times a number
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lead good property
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Density and unrigidness
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sound meter coresponding to human hearing
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"A"
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why is STC better?
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human scale
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calculate a bunch of numbers of dB
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largest + 3
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adjustable hall
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adjust absorption and wall distance?
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Haas orPrecedence
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First sound determines the direction
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Panel sound absorber
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acts like a drum head, react and resonate at a certain frequency
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wave length calculation
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人=/t
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