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About Time Correction
The distance between the listener and the speakers in a car vary widely
due to the complex speaker placement. This difference in the distances
from the speakers to the listener creates a shift in the sounds image and
frequency characteristics. This is caused by the time delay between the
sound reaching the listener's right versus the left ear. To correct this, this
unit is able to delay the audio signal to the speakers closest to the listener.
This effectively creates a perception of increased distance for those
speakers. The listener can be placed at an equal distance between the left
and right speakers for optimum staging. The adjustment will be made for
each speaker in 3.4cm steps.
Listening Position example as follows:
Example 1: Front Left Seat
Adjust the time correction level of the front left speaker to a high value
and the rear right to zero or a low value.
0.5m
2.25m
The sound is not balanced because the distance between the listening
position and the various speakers is different. The difference in distance
between the front left speaker and the rear right speaker is 1.75 m (68-
7/8"). Here we calculate the time correction value for the front left
speaker in the diagram on the above.
Conditions:
Farthest Speaker - listening position : 2.25 m (88-9/16") Front
left speaker - listening position : 0.5 m (19-11/16") Calculation:
L = 2.25 m - 0.5 m = 1.75 m (68-7/8") Time correction = 1.75 ÷
*1
343
× 1000 = 5.1 (ms)
*1 Speed of sound: 343 m/s (765 mph) at 20°C
In other words, giving the front left speaker a time correction value
of 5.1 ms makes it seem as if its distance from the listener is the same
as the distance to the farthest speaker. Time correction eliminates the
differences in the time required for the sound to reach the listening
position.
The time of the front left speaker is corrected by 5.1 ms so that its sound
reaches the listening position at the same time as the sound of other
speakers.
Example 2: All Seats
Adjust the time correction level of each speaker to almost the same level.
1
Sit in the listening position (driver' s seat, etc.) and measure
the distance (in meters) between your head and the various
speakers.
38
-EN
5.1ms
2
Calculate the difference between the distance correction
value to the farthest speaker and the other speakers.
L = (distance to farthest speaker) - (distance to other speakers) These
values are the time correction values for the different speakers. Setting
these values to make each sound reach the listening position at the
same time as the sound of other speakers.
Time Correction Value List
Delay
Time Di er-
Number
ence (ms)
0
0.0
1
0.1
2
0.2
3
0.3
4
0.4
5
0.5
6
0.6
7
0.7
8
0.8
9
0.9
10
1.0
11
1.1
12
1.2
13
1.3
14
1.4
15
1.5
16
1.6
17
1.7
18
1.8
19
1.9
20
2.0
21
2.1
22
2.2
23
2.3
24
2.4
25
2.5
26
2.6
27
2.7
28
2.8
29
2.9
30
3.0
31
3.1
32
3.2
33
3.3
34
3.4
35
3.5
36
3.6
37
3.7
38
3.8
39
3.9
40
4.0
41
4.1
42
4.2
43
4.3
Distance
Distance (cm)
(inch)
0.0
0.0
3.4
1.3
6.8
2.7
10.2
4.0
13.6
5.4
17.0
6.7
20.4
8.0
23.8
9.4
27.2
10.7
30.6
12.1
34.0
13.4
37.4
14.7
40.8
16.1
44.2
17.4
47.6
18.8
51.0
20.1
54.4
21.4
57.8
22.8
61.2
24.1
64.6
25.5
68.0
26.8
71.4
28.1
74.8
29.5
78.2
30.8
81.6
32.2
85.0
33.5
88.4
34.8
91.8
36.2
95.2
37.5
98.6
38.9
102.0
40.2
105.4
41.5
108.8
42.9
112.2
44.2
115.6
45.6
119.0
46.9
122.4
48.2
125.8
49.6
129.2
50.9
132.6
52.3
136.0
53.6
139.4
54.9
142.8
56.3
146.2
57.6
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