WildCat FM /technical station.
Transmitter happily made
Let's output a beautiful electric wave/a basic part of a standard electric wave
Pre-emphasis


 

When transmitting, (Pre-emphasis) raises the upper register.
To improve compared with S/N (signal vs. noise) omitted to sending and receiving by the (De-emphasis) thing that suppresses the upper register when receiving it, it is done.

This operation is a general technique for improving doing at time etc. such as the cassette tapes again compared with S/N.

Japan and a part of country of Europe is used and 75us is used with 50us in the country such as the United States.
 

is assumed to be an integrated of include frequency response this (Pre-emphasis) when omitting it to the frequency response.
 
 

The following table is an integrated frequency response, and the tolerance. DB mark of 50us/Pre-emphasis in each frequency to the right
 
 

50ｵS Pre-emphasi and De-emphasis. data For 'PDF
 
 

 
 
50us/Pre-emphasis -(for japan)
Hz
dB
400HzREF dB
1000HzREF dB
30
0.00
-0.07
-0.41
50
0.00
-0.07
-0.41
100
0.00
-0.06
-0.40
200
0.02
-0.05
-0.39
300
0.04
-0.03
-0.37
400
0.07
0.00
-0.34
500
0.11
0.04
-0.30
600
0.15
0.08
-0.26
700
0.21
0.14
-0.20
800
0.27
0.20
-0.14
900
0.33
0.27
-0.07
1000
0.41
0.34
0.00
1500
0.87
0.80
0.46
2000
1.45
1.38
1.04
2500
2.09
2.02
1.68
3000
2.76
2.69
2.35
3500
3.44
3.37
3.03
4000
4.11
4.05
3.71
4500
4.77
4.70
4.36
5000
5.40
5.33
4.99
5500
6.00
5.94
5.60
6000
6.58
6.51
6.17
6500
7.13
7.07
6.78
7000
7.66
7.59
7.25
7500
8.16
8.10
7.75
8000
8.64
8.58
8.23
8500
9.10
9.03
8.69
9000
9.54
9.47
9.13
9500
9.96
9.89
9.55
10000
10.36
10.29
9.95
10500
10.75
10.68
10.34
11000
11.12
11.05
10.71
11500
11.48
11.41
11.07
12000
11.82
11.75
11.41
12500
12.15
12.09
11.75
13000
12.47
12.41
12.07
13500
12.78
12.72
12.38
14000
13.08
13.02
12.68
14500
13.37
13.31
12.97
15000
13.66
13.59
13.25

 

 
 
What is the Ideal FM transmitter
What is the Quality of electric wave
a basic part of a standard electric wave /Pre-emphasis

 
 
 
 
 
 

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LastUpdate. 2005/01/20