Codec Performance ......
relative to the Eurocom Specification D1 - IA8
30
Input Level = -20dBm0
20
25
Input Level = -20dBm0
S/N Ratio (dB)
S/N Ratio (dB)
0
1
2
3
15
20
15
10
10
5
5
0
1
2
3
Input Frequency (kHz)
Input Frequency (kHz)
Fig.10 S/N vs Input Frequency (16kbit/s)
Fig.11 S/N vs Input Frequency (32kbit/s)
0
1.0
0.9
Amplitude of test
signal (g) - Table 1.
-6
Amplitude (dB)
- 12
- 6dB/octave
Amplitude
- 18
0.397
Beginning of
discharge
- 24
0.1
Amplitude of
test signal (a)
- 30
10
100
1k
10k
0.00794
8.76
5.76
Frequency (Hz)
Time (ms)
Fig.12 Principal Integrator Response
Fig.13 Compand Envelope
+ 10
2
0
3
- 10
Input Level = -20dBm0
Gain (dB)
- 20
- 30
- 40
- 50
- 60
0
0.3
1
1.4
2
2.6
3
3.4
4
5
6
Fig.14 Attenuation Distortion vs Frequency (32kbit/s)
7
Frequency (kHz)
CMLMICRO [ CML MICROCIRCUITS ]
