AMBE-2000™ Vocoder Chip Users Manual
Version 4.92, June, 08
DVSI Confidential Proprietary, Subject to Change
Page 34
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Figure 5-B Basic Framed Output Format
Word #
Description
0
Header always set to 0x13ec
1
Power Control ID (8bits)
Control Word 1 (8 bits) – see Table 5-J
2
Rate info 0
3
Rate info 1
4
Rate info 2
5
Rate info 3
6
Rate info 4
7
Bit Error Rate
8
Soft Decision Distance
9
Detected Bit Errors In Current Frame
10
DTMF Control – see Table 5-L
(1
2
)
1
6
b
it
w
o
rd
s
o
f
o
v
e
rh
e
a
d
(1
9
2
b
it
s
)
11
Control Word 2 – see Table 5-N
12
Channel Data
13
Channel Data
14
Channel Data
15
Channel Data
16
Channel Data
17
Channel Data
18
Channel Data
19
Channel Data
20
Channel Data
21
Channel Data
22
Channel Data
2
0
m
s
f
ra
m
e
2
4
s
ix
te
e
n
-b
it
w
o
rd
s
=
4
8
b
y
te
s
=
3
8
4
b
it
s
(1
2
)
1
6
b
it
w
o
rd
s
o
f
d
a
ta
(1
9
2
b
it
s
)
23
Channel Data
5.3.1
Framed Output: Word 0 : Header
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
Framed Output: Word 1 : Power Control ID
The encoder will always use 0x00 in the 8-bit field of an output frame.
5.3.3
Framed Output: Word 1 : Control Word 1
This 8-bit control word indicates the activity of various functions.
Table 5-J Control Word 1 Format
Control Word 1 – 8-bits (See Table 1-A)
7: MSB
6
5
4
3
2
1
0: LSB
Unused
Unused
Decoder
Frame
Repeat
Decoder
Silence
Detect
Unused
Unused
Encoder
Silence
Detect
Encoder
DTMF
Detect
Decoder Frame Repeat: When the Decoder Frame Repeat flag is set to 1, the decoder is reporting that the last frame
decoded was a repeat of the previous frame.
Decoder Silence Detect: When the Decoder Silence Detect flag is set to 1, the decoder is reporting that the last frame
decoded was a comfort noise frame.
Encoder DTMF Detect: The Encoder DTMF Detected Flag will be set to a 1 when the encoder detects a DTMF tone.
