CMX882 데이터 시트보기 (PDF) - CML Microsystems Plc
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CMX882 Datasheet PDF : 70 Pages
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FRS Signalling Processor
CMX882
AC Parameters (cont.)
Analogue Channel Audio Filtering
Pass-band (nominal bandwidth):
Received voice
12.5kHz channel transmitted voice
25kHz channel transmitted voice
Pass-band Gain (at 1.0kHz)
Pass-band Ripple (wrt gain at 1.0kHz)
Stop-band Attenuation
Residual Hum and Noise
Pre-emphasis
De-emphasis
Audio Scrambler
Inversion frequency
Pass band
Notes Min.
Typ.
Max.
Unit
71
300
3000
Hz
72
300
2550
Hz
73
300
3000
Hz
0
dB
-2
+0.5
dB
33.0
dB
76
-50
dBp
74
6
dB/oct
75
−6
dB/oct
3300
Hz
300
3000
Hz
Notes: 71
72
73
74
75
76
The receiver voice filter complies with the characteristic shown in Figure 5. The
high pass filtering removes sub-audio components from the audio signal.
The 12.5kHz channel filter complies with the characteristic shown in Figure 9.
The 25kHz channel filter complies with the characteristic shown in Figure 8.
The pre-emphasis filter complies with the characteristic shown in Figure 10.
The de-emphasis filter complies with the characteristic shown in Figure 6.
dBp represents a psophometrically weighted measurement.
2004 CML Microsystems Plc
66
D/882/7
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