Codec Performance ...... relative to the Eurocom Specification D1 - IA8
3
2
3
2
1
1
0
0
- 1
- 1
Ref: 0dBm0 Input Level = 489mVrms
Input Frequency = 820Hz
Ref: 0dBm0 Input Level = 489mVrms
Input Frequency = 820Hz
- 2
- 3
- 2
- 3
ref.
ref.
- 50 - 40
- 30 - 20 - 10
0
10
- 50 - 40
- 30 - 20 - 10
0
10
Input Level (dBm0)
Input Level (dBm0)
Fig.6 Gain vs Input Level (32kbit/s)
Fig.5 Gain vs Input Level (16kbit/s)
20
Ref: 0dBm0 Input Level = 489mVrms
Input Frequency = 820Hz
Ref: 0dBm0 Input Level = 489mVrms
Input Frequency = 820Hz
25
15
20
10
8
15
- 10
- 30
- 20
0
- 10
- 30
- 20
- 40
0
- 40
Input Level (dBm0)
Input Level (dBm0)
Fig.8 S/N vs Input Level (32kbit/s)
Fig.7 S/N vs Input Level (16kbit/s)
+ 10
1.5
0
1.5
- 10
- 20
- 30
Input Level = -20dBm0
- 40
- 50
- 60
2.6
0.3
0
1
2
3
4
5
6
Frequency (kHz)
Fig.9 Attenuation Distortion vs Frequency (16kbit/s)
6
CMLMICRO [ CML MICROCIRCUITS ]
