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參數(shù)資料
| 型號： | U3900BM |
| 英文描述： | Programmable Telephone Audio Processor |
| 中文描述： | 程控電話音頻處理器 |
| 文件頁數(shù)： | 2/34頁 |
| 文件大?。?/td> | 762K |
| 代理商： | U3900BM |
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U3900BM
Rev. A2, 25-Aug-98
Target Specification
10 (34)
2.2.8
SCWID: Overview
14608
EGT
Alert signal
high-frequency
logic part
Alert signal
low-frequency
logic part
Analog
filter
Analog
filter
2130 Hz
2750 Hz
UGT
DGT
FC
Time guard
Command bits CDE < 0...8 >
from serial bus
Wetting
pulse
W pulse
Alert
To interrupt
system
CLASS
signal
To CLID FSK filter
Figure 8. Alert detection
General information:
All the control bits provided for the SCWID function can be modified at any time with the microprocessor.
2.2.9
CAS Detect Process
Typical application:
The incoming signal from the CO is not polluted with speech or music. (The feature early guard time is not used)
Choice of 4
DGT values
Down guard
time
Interrupt
to the
P
CAS signal duration: 80
± 5 ms
frequencies: 2130 Hz + 2750 Hz
Interrupt
to the
P
Up guard
time
Choice of 4
UGT values
IN SCWID
detector
OUT SCWID
detector
14609
Figure 9. Timing diagram of standard alert detection
If any drop in the CAS signal occurs before the end of the
UGT specified value, then the time counter restarts and
the OUT SCWID detector remains low.
If any spike in the blank signal occurs before the end of
the DGT specified value, then the time counter restarts
and the OUT SCWID detector remains high.
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