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CMX608 数据表(PDF) 28 Page - CML Microcircuits

部件名 CMX608
功能描述  Integrated Input and Output Channel Filters
PDF  70 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  CMLMICRO [CML Microcircuits]
网页  http://www.cmlmicro.com
标志 CMLMICRO - CML Microcircuits

CMX608 数据表(HTML) 28 Page - CML Microcircuits

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RALCWI Vocoder
CMX608/CMX618/CMX638
 2014 CML Microsystems Plc
28
D/608_18_38/11
Format 2
This format corresponds with the row and column layout of a standard telephone keypad
matrix. This format is used when bit 7 of the VCFG register ($07) is set to '1'.
1209Hz
1336Hz
1477Hz
1633Hz
Row Index
Bit 3:2
697Hz
1
2
3
A
0
770Hz
4
5
6
B
1
852Hz
7
8
9
C
2
941Hz
*
0
#
D
3
Column Index
Bit 1:0
0
1
2
3
Table 3 Standard DTMF Keypad Layout
This results in the following table in ascending numerical order for the bit patterns.
Bit 3
Bit 2
Bit 1
Bit 0
Symbol
0
0
0
0
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
A
0
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
B
1
0
0
0
7
1
0
0
1
8
1
0
1
0
9
1
0
1
1
C
1
1
0
0
*
1
1
0
1
0
1
1
1
0
#
1
1
1
1
D
Table 4 DTMF - Format 2
5.8.
Operation with STD (Single Tones)
The CMX608, CMX618 and CMX638 (in half-duplex mode only) can be enabled to send or receive single
tones. This facility is not available when the CMX638 is used in full-duplex mode.
The STD generators and detectors are provided so that commonly encountered tones can be reproduced
naturally at the other end of a Vocoded link, rather than being interpreted as a form of speech. They should
not be relied upon to provide an error free method of relaying tone signalling to other decoders.



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