AMBE-2000 Digital Voice Systems, Inc., AMBE-2000 Datasheet - Page 31

• Manufacturer Part Number: AMBE-2000
• Description: 2.0 - 9.6 KBPS Single ic For Toll-quality, Low Data Rate, Real Time Speech Compression
• Manufacturer: Digital Voice Systems, Inc.

5.3
The format for Framed output data is shown in Figure 5-B. Only the bits in the Channel Data Bits are transmitted along with
framing information (data used to locate the start of each frame for proper reconstruction at the decoder) over the channel. The
first 192 bits provide overhead information, which is sometimes useful to the host but is generally not transmitted over the
channel.
5.3.1
The header is a 16-bit word that begins each valid frame corresponding to 20 milliseconds of speech. This field will always be
0x13EC.
5.3.2
The encoder will always use 0x00 in the 8-bit field of an output frame.
5.3.3
This 8-bit control word indicates the activity of various functions.
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Framed Output
Framed Output: Word 0 : Header
Framed Output: Word 1 : Power Control ID
Framed Output: Word 1 : Control Word 1
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Unused
7: MSB
Table 5-J Control Word 1 Format
Unused
6
Word #
10
11
12
13
14
15
16
17
18
19
20
21
22
23
0
1
2
3
4
5
6
7
8
9
Decoder
Repeat
Frame
5
Header always set to 0x13ec
Power Control ID (8bits)
Rate info 0
Rate info 1
Rate info 2
Rate info 3
Rate info 4
Bit Error Rate
Soft Decision Distance
Detected Bit Errors in Current Frame
DTMF Control – see Table 5-L
Control Word 2 – see Table 5-N
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Channel Data
Control Word 1 – 8-bits (See Table 1-A)
AMBE-2000™ Vocoder Chip
Figure 5-B Basic Framed Output
User’s Manual Version 4.0
Decoder
Silence
Detect
4
Unused
3
Description
Control Word 1 (8 bits) – see Table 5-J
Unused
2
Encoder
Silence
Detect
1
Encoder
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0: LSB
Detect
DTMF