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.
Adjust the time correction level
of
the front left speaker
to
a high value
and the rear right
to
zero or a low value.
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 =
175
m (68-7/8")
Time correction
= 1.75.;.
343*1)(
1000 =
5.1
(ms)
*1
Speed
of
sound: 343
/Ills
(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.
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,
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)
32-EN
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
Distance
Distance
Delay
Time
Distance
Distance
Difference
Difference
Number
(ms)
(em)
(inch)
Number
(ms)
(em)
(inch)
0
0.0 0.0 0.0
51
5.1
173.4
68.3
1
0.1
3.4 1.3
52
5.2
1768
697
2 0.2 6.8 2.7
53
5.3
1802
710
3
03
10.2 4.0
54
5.4 183.6 72.4
4 0.4 13.6 5.4
55
5.5 187.0 73.7
5
0,5 17,0
6,7
56
56
190.4 75.0
6
0,6
20.4 8.0
57
5.7
1938
76.4
7 0.7 23.8 9.4
58
5,8
1972
77.7
8
0,8 27,2 10.7
59
59
200.6
79.1
9
0.9 30.6
12,1
60
6,0
204.0 80.4
10
10
340
13.4
61
6.1
207.4
817
11
1,1
37.4
14.7
62
62
2108
831
12
1,2
40,8
161
63
63
214.2
84.4
13
13
44.2
17.4
64
64
217,6 85,8
14
1.4 47,6
18.8
65
65
221.0
871
15
1,5
51.0 20.1
66
6.6 224.4 88.4
16
1.6 54.4 21.4
67 6.7
2278
898
17
1,7
578
228
68
6.8
231.2
91.1
18
1.8 61.2 24.1
69
69
234,6 92,5
19
1.9
646
25.5
70
7.0 238.0 93.8
20
20
68,0 26,8
71
7,1
241.4
95,1
21
2,1
71.4
281
72
72
244,8
965
22 2.2
748
295
73
73
248.2 97.8
23
23
782
308
74
7.4 251.6 99,2
24
2.4 81.6
322
75
75
2550
100.5
25
25
850
33,5
76
7.6
258.4
101.8
26
26
88.4
34,8
77
7.7
2618
103,2
27
2.7
918
36.2
78
7.8 265,2 104.5
28 2.8
952
375
79
7.9
2686
105.9
29
2,9
986
389
80
8.0
2720
107,2
30
30
1020
40.2
81
8,1
275.4 108,5
31
3.1
105.4
41,5
82
82
278,8
1099
32
3,2
108,8
42,9
83
8.3
282,2 111,2
33
3,3
1122
442
84
8.4
2856
112,6
34
3.4 115.6 45.6
85
8.5
2890
1139
35
35
119.0 46,9
86
8.6 292.4 115.2
36
36
122.4
482
87
8,7
295.8
1166
37 3.7
1258
49.6
88
88
299.2
1179
38 3.8 129.2 50.9
89
89
302.6
119,3
39
39
132.6 52,3
90
90
306,0
1206
40
4,0
136,0
536
91
9.1
309.4 121.9
41
4,1
139.4
549
92
92
3128
123,3
42
42
142,8
56.3
93
93
316.2
1246
43 4.3 146.2 57.6
94
9.4
3196
1260
44
4.4
1496
59.0
95
95
323.0
1273
45
4.5 153.0 60.3
96 9.6
326.4
1286
46 4.6 156.4 61.6
97
9.7 329,8 130.0
47
4.7
159.8
630
98
98
3332
1313
48
48
163.2 64.3
99
9.9
336.6
132.7
49
49
1666
65.7
-------------
50
50
170,0
670
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