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參數(shù)資料
| 型號(hào)： | MT8888CN-1 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | CB 3C 3#16S SKT RECP WALL |
| 中文描述： | 綜合DTMFTransceiver與英特爾微型接口 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 302K |
| 代理商： | MT8888CN-1 |
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MT8888C/MT8888C-1
4-95
applications, leaving R1 to be selected by the
designer. Different steering arrangements may be
used to select independent tone present (t
GTP
) and
tone absent (t
GTA
) guard times. This may be
necessary to meet system specifications which place
both accept and reject limits on tone duration and
interdigital pause. Guard time adjustment also allows
the designer to tailor system parameters such as talk
off and noise immunity.
Increasing t
REC
improves talk-off performance since
it reduces the probability that tones simulated by
speech will maintain a valid signal condition long
enough to be registered. Alternatively, a relatively
short t
REC
with a long t
DO
would be appropriate for
extremely noisy environments where fast acquisition
time and immunity to tone drop-outs are required.
Design information for guard time adjustment is
shown in Figure 6. The receiver timing is shown in
Figure 7 with a description of the events in Figure 9.
Call Progress Filter
A call progress mode, using the MT8888C/
MT8888C-1, can be selected allowing the detection
of various tones, which identify the progress of a
telephone call on the network. The call progress
tone input and DTMF input are common, however,
call progress tones can only be detected when CP
mode has been selected. DTMF signals cannot be
detected if CP mode has been selected (see Table
7). Figure 8 indicates the useful detect bandwidth of
the call progress filter. Frequencies presented to the
input, which are within the ‘a(chǎn)ccept’ bandwidth limits
of the filter, are hard-limited by a high gain
comparator with the IRQ/CP pin serving as the
output. The squarewave output obtained from the
schmitt trigger can be analyzed by a microprocessor
or counter arrangement to determine the nature of
the call progress tone being detected. Frequencies
which are in the ‘reject’ area will not be detected and
consequently the IRQ/CP pin will remain low.
Figure 8 - Call Progress Response
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
A
A
A
A
A
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AA
AA
AA
AA
LEVEL
(dBm)
FREQUENCY (Hz)
-25
0
250
500
750
= Reject
= May Accept
= Accept
Figure 7 - Receiver Timing Diagram
V
in
ESt
St/GT
RX
0
-RX
3
b3
b2
Read
Status
Register
IRQ/CP
EVENTS
A
B
C
D
E
F
t
REC
t
REC
t
ID
t
DO
TONE #n
TONE
#n + 1
TONE
#n + 1
t
DP
t
DA
t
GTP
t
GTA
t
PStRX
t
PStb3
DECODED TONE # (n-1)
# n
# (n + 1)
V
TSt
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8888CS-1 | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888C | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888CC | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888 | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888CE | Integrated DTMFTransceiver with Intel Micro Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8888CP | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Integrated DTMF Transceiver with Intel Micro Interface |
| MT8888CP1 | 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 28PLCC - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 28PLCC 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 28PLCC |
| MT8888CPR | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 28PLCC - Tape and Reel |
| MT8888CPR1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 28PLCC - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 28PLCC 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 28PLCC |
| MT8888CS | 制造商:Microsemi Corporation 功能描述: |
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