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Pro Audio Time Delay

 
Time difference Δ t and sound path - distance or length d
 Conversion: Running time to milliseconds or microseconds ←→ sound path to meters, cm, feet or inches
The acoustic time of the travelling sound is converted to distance or the length is converted to time
 
 Converter: milliseconds and microseconds to seconds: Click here
 Converter: millimetres, centimetres and micrometers to meters: Click here
 
Notice: 1 second (s) = 1000 milliseconds (ms) and 0.001 second (s) = 1 millisecond (ms).
1 millisecond (ms) = 1000 microseconds (µs).

Time difference in (ms) 
or microseconds (µs) 		 ms µs   |    Distance in (m), centimetres 
(cm), feet (ft), or inches ('') 		 m cm ft  '' 
      |      
↓   |   ↓
      |      
Distance in meters (m)    |   Time difference in seconds 
Centimeters (cm)    |   = seconds 
Feet (ft)    |   + Milliseconds 
Inches (")    |   + Microseconds 
                                          For the speed of sound of c = m / s ft / s                                                     
Fill in the grey fields above, select the unit and click on the calculation button of the respective
column. Also the adjusted speed of sound c can be changed: 343 m/s or 1125.33 ft/s at 20°C.
When converting seconds to distance, the seconds have to be multiplied by 1000 and entered in
the first field with the unit ms. The well known maximum value of the time difference from ear to
ear is 0.63 ms - and the strange "ear distance" that is believed to be 0.175 m = 17.5 cm.
Really? Do a calculation.       c = d / Δ t        d = Δ t × c       Δ t = d / c        d = distance

In SI units with dry air at 20 °C (68 °F), the speed of sound c is 343 m/s.
This also equates to 1235 km/h, 767 mph, and 1125 ft/s.

The time duration of sound per meter (in air)

Effect of temperature on the time difference Δ t
Dependence of the speed of sound only on the temperature of the air

Temperature
of air in °C		 Speed of sound
c in m/s		 Time per 1 m 
Δ t in ms/m
+35 352.0 2.840
+30 349.1 2.864
+25 346.2 2.888
+20 343.2 2.912
+15 340.3 2.937
+10 337.3 2.963
  +5 334.3 2.990
  ±0 331.3 3.017
  −5 328.2 3.044
−10 325.2 3.073
−15 322.0 3.103
−20 318.8 3.134
−25 315.7 3.165
 
 
 Sound engineers take usually the rule of thumb:
 For the distance of 1 m the sound needs nearly 3 ms in air. 
 
 
Metres delay in milliseconds   Feet delay in milliseconds
5 14.6   20 17.9
10 29.2   30 26.8
15 43.8   40 35.7
20 58.5   50 44.6
25 73.1   60 53.6
30 87.7   70 62.5
35 102.3   80 71.4
40 117.0   90 80.4
45 131.6   100 89.3
50 146.2   110 98.2
55 160.8   120 107.1
60 175.4   130 116.1
65 190.1   140 125.0
70 204.7   150 133.9
75 219.3   160 142.9
80 233.9   170 151.8
85 248.5   180 160.7
90 263.2   190 169.6
95 277.8   200 178.6

 

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 LAST UPDATED : Thursday, 10 May 2012