Coustic 401SE User Manual download pdf (Page 44)

Appendix B

Sound Examiner SE-400 Series

Figure B-3: Fast response to a tone burst

SPL/L

Sound pressure level. A ratio of one sound pressure to a reference pressure. Because of the enormous dynamic

range of the human ear, the ratio is calculated logarithmically by the formula below, where L

is the reference

pressure.

Threshold

An SPL value that defines a lower level of acceptable values. Only SPL samples that exceed the threshold are used

in some calculations.

Upper Limit (UL)

The total time during a study that the SPL exceeds the Upper Limit meter setting.

SPL 20lo g

-----

 

 

dB=

Relative response (dB)

Burst duration, t (milliseconds)

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 120 121

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Coustic 401SE User Manual Page 44