Computing parameters

Now go to Calculate->ISO 3382... to compute the parameters as shown below.

 

 

 

Click the  button to copy the results to clipboard. The results are shown below (we have put the numbers in a table. To do this in MS Word, first mark the data, then go to Table->Insert->Table... and the table is automatically generated):

 

G:\BigBackup\WinMLSmeasurements\NPLsurreyWorkshop\SmallRoom\SineSweepHighLevelCut.wav

F(Hz)

  63

 125

 250

 500

1000

2000

4000

8000

16000

snr(dB)

30.1

50.3

53.7

54.3

54.0

55.3

52.6

43.0

24.5

edr(dB)

44.6

57.9

60.3

66.2

69.1

68.8

69.3

61.6

39.8

EDT(s)

0.34

0.29

0.24

0.21

0.22

0.18

0.18

0.20

0.20

T30(s)

0.35

0.26

0.22

0.19

0.21

0.21

0.20

0.19

0.18

corr

 

-0.997

-0.995

-0.994

-0.992

-0.996

-0.998

-0.999

-0.998

-0.999

T20(s)

0.34

0.25

0.20

0.21

0.23

0.23

0.20

0.18

0.18

corr

-0.997

-0.991

-0.993

-0.979

-0.995

-0.996

-0.998

-0.998

-0.999

Tc(ms)

  32

  30

  29

  20

  20

  19

  19

  20

  20

C80(dB)

13.3

19.6

24.0

23.3

20.5

22.0

24.0

24.4

22.9

D50(dB)

  93

  93

  94

  94

  95

  96

  96

  97

 100

G(dB)

50.4

55.2

54.6

50.0

45.1

44.0

42.3

37.1

108.0

r(m)

60.8

 

 

 

 

 

 

 

 

 

The last parameter on the list, r(m), gives the distance from the loudspeaker to the microphone in meters. In this case the r(m) value is wrong, since the sound card was not set to measure the correct time delay. If you have followed the sections above, you have seen that WinMLS has no problem of measuring the correct time delay/distance if the sound card is set properly.