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
文件頁數(shù)： 6/34頁
文件大?。?/td> 762K
代理商： U3900BM
U3900BM
Rev. A2, 25-Aug-98
Target Specification
14 (34)
7
DTMF Dialing
The DTMF generator sends a multi-frequency signal
through the matrix to the line. The signal is the result of
the sum of two frequencies and is internally filtered. The
frequencies are chosen from a low and a high frequency
group.
The circuit conforms to the CEPT recommendation
concerning DTMF option (rec. T/CF 46–03).
Two different levels for the low level group and two
different preemphasis (2.5 dB and 3.5 dB) can be chosen
by means of the serial bus.
7.1
Melody – Confidence Tone
Generation
Melody/confidence tone frequencies are given in the
table below.
The frequencies are provided at the DTMF input of the
switch matrix. A sinus wave, a square wave or a pulsed
wave can be selected by the serial bus. Square signal
means output is half of frequency cycle high and half low,
so duty cycle of 50% square wave or 50% for pulsed
signal.
DTMFM[0:2]
0
000
DTMF generator OFF
1
001
Confidence tone melody
on (sinus)
2
010
Ringer melody (pulse)
3
011
Ringer melody
(square signal)
4
100
DTMF(high level)
5
101
DTMF(low level)
6
110
7
111
DTMFF[0:1]
in DTMF
Mode
Frequency
Error / %
0
00
697
–0.007
1
01
770
–0.156
2
10
852
0.032
3
11
941
0.316
DTMFF[2:3]
in DTMF
Mode
Frequency
Error / %
0
00
1209
–0.110
1
01
1336
0.123
2
10
1477
–0.020
3
11
1633
–0.182
DTMFF4 in DTMF mode
Preemphasis Selection
0
2.5 dB
1
3.5 dB
DTMFF
[0:4]
f
Hz
Tone-
Name
Error/%
DTMF
Key
0
00000
440.0
a1
–0.008
697
1209
1
1
00001
466.2
b1
–0.016
770
1209
4
2
00010
493.9
h1
–0.003
852
1209
7
3
00011
523.2
c2
0.014
941
1209
*
4
00100
554.4
des2
0.018
697
1336
2
5
00101
587.3
d2
–0.023
770
1336
5
6
00110
622.3
es2
–0.129
852
1336
8
7
00111
659.3
e2
0.106
941
1336
0
8
01000
698.5
f2
–0.216
697
1477
3
9
01001
740.0
ges2
–0.222
770
1477
6
10
01010
784.0
g2
0.126
852
1477
9
11
01011
830.0
as2
–0.169
941
1477
#
12
01100
880.0
a2
0.288
697
1633
A
13
01101
932.3
b2
–0.014
770
1633
B
14
01110
987.8
h2
–0.004
852
1633
C
15
01111
1046.5
c3
–0.335
941
1633
D
16
10000
1108.7
des3
–0.355
697
1209
1
17
10001
1174.7
d3
–0.023
770
1209
4
18
10010
1244.5
es3
–0.129
852
1209
7
19
10011
1318.5
e3
0.106
941
1209
*
20
10100
1396.9
f3
–0.214
697
1336
2
21
10101
1480.0
ges3
–0.222
770
1336
5
22
10110
1568.0
g3
0.126
852
1336
8
23
10111
1661.2
as3
–0.241
941
1336
0
24
11000
1760.0
a3
–0.302
697
1477
3
25
11001
1864.6
b3
–0.014
770
1477
6
26
11010
1975.5
h3
0.665
852
1477
9
27
11011
2093.0
c4
0.367
941
1477
#
28
11100
2217.5
des4
0.387
697
1633
A
29
11101
2349.3
d4
0.771
770
1633
B
30
11110
2663.3
–––
852
1633
C
31
11111
2983.0
–––
941
1633
D
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