Tableau de comparaison dB-dBu-dBV
dBu = 20 log V/0.775 quand la tension ne dépend pas de l’impédance
dBm = 20 log V/0.775 quand la tension est mesurée à 600 ohms
dBV = 20 log V/1
Multiplicateur (ratio de
tension relatif à référence) |
dB |
Réf. de tension pour |
PPM
échelle GB |
PPM
échelle EBU |
VU
échelle GB |
| dBu |
dBV |
| 10 |
20 |
7.75V |
10.0V |
|
|
|
| 4 |
12 |
3.08V |
3.98V |
7 |
12 |
|
|
8 |
1.95V |
2.51V |
6 |
8 |
4 |
|
7 |
1.73V |
2.24V |
|
|
|
| 2 |
6 |
1.55V |
2.00V |
|
|
2 |
|
5 |
1.38V |
1.78V |
|
|
|
|
4 |
1.23V |
1.59V |
5 |
4 |
0 |
| 1.41 |
3 |
1.09V |
1.41V |
|
|
|
|
2 |
975mV |
1.26V |
|
|
|
|
1 |
869mV |
1.12V |
|
|
|
| 1 |
0 |
775mV |
1.00V |
4 |
0 |
–4 |
|
–1 |
690mV |
891mV |
|
|
|
|
–2 |
615mV |
794mV |
|
|
|
| 0.7 |
–3 |
548mV |
708mV |
|
|
–7 |
|
–4 |
489mV |
631mV |
3 |
–4 |
–8 |
|
–5 |
436mV |
562mV |
|
|
|
| 0.5 |
–6 |
388mV |
501mV |
|
|
–10 |
|
–8 |
308mV |
398mV |
2 |
–8 |
|
| 0.25 |
–12 |
195mV |
251mV |
1 |
–12 |
|
|
–18 |
97.5mV |
126mV |
|
|
|
|
–24 |
48.9mV |
63.1mV |
|
|
|
|
–30 |
25.4mV |
31.6mV |
|
|
|
| 0.01 |
–40 |
7.75mV |
10.0mV |
|
|
|
|
–50 |
2.45mV |
3.16mV |
|
|
|
| 0.001 |
–60 |
774µV |
1.00mV |
|
|
|
|
–70 |
245µV |
316µV |
|
|
|