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