參數(shù)資料
型號(hào)： 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(yè)數(shù)： 3/34頁(yè)
文件大?。?/td> 762K
代理商： U3900BM
U3900BM
Target Specification
Rev. A2, 25-Aug-98
11 (34)
CAS Detect Process (continued)
Improved process:
To prevent false detection from speech and music by the far and the near end (talk-off), and to detect the incoming CAS
signal from the CO, polluted with speech or music by the near end (talk-down), a new feature is used: the early and
up guard time.
Interrupt
to the
P
CAS signal duration: 80
±5 ms
frequencies: 2130 Hz + 2750 Hz mixed with speech and music frequencies
Early
guard time
Choice of 3
EGT values
IN SCWID
detector
OUT SCWID
detector
14610
Restart
3 Drops had no effect (FDD = 4 ms, FDC = 4)
Up guard time
Drops
In signal
Values permitted for drops after
a successful early guard time
Choice of 4
UGT values
Figure 10. Timing diagram for early and up guard time
Note: In the case above, the EGT counter restarts 3 times. After a sucessful 10.3-ms EGT, 3 drops occured but without
any effect because the duration and the number is less than the maximum permitted.
Interrupt
to the
P
CAS signal duration: 80
±5 ms
frequencies: 2130 Hz + 2750 Hz mixed with speech and music frequencies
Early guard time
Choice of 3
EGT values
IN SCWID
detector
OUT SCWID
detector
14611
Restart
Down guard time
Filter values permitted for spikes
after a successful early guard time
Choice of 4
DGT values
Spikes
in signal
5 Spikes had no effect (FDD = 4 ms)
mixed with speech and music frequencies
Figure 11. Timing diagram of early and down guard time
Note: In the case above, the EGT counter restarts 3 times. After a sucessful 13.7-ms EGT, 5 spikes occured but without
any effect because the duration is less than the maximum permitted.
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