AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 38

• Manufacturer Part Number: AMBE-1000
• Manufacturer: Digital Voice Systems, Inc.

4.1.14.2
4.1.14.3
0x13EC
Header
The AMBE-1000 is not recommended for new designs.
0x01
ID
Please refer to the AMBE-2000/2020 product line.
Control_0 Control_1 Control_2 Control_3
Framed Input : ID = 0x01 : Rate Configuration
Framed Input : ID = 0x02 : Input / Output Gain and Silence Threshold Configuration
Table
Table 4-I Rate Selection Frame Format
There are two ways to select the coding rate for the AMBE-1000™. One is through the
hardware pins BPS_SEL[3-0] (see Section 6.2 and Table 6-A) . Additionally, the coding
rate can be modified for both the encoder and the decoder through this software
interface. Any selection of the coding rate made through ID value 0x01 will override
the coding rate selected through the BPS_SEL[3-0] pins.
interpreted as in section 4.1.12. Control_1 and Conrol_2 determine the Speech coding
rate and the FEC rate according to Table 4-J. Control_3 has no function but must be
set to 0x0000. During the frame in which the rate changes are being made the data in
the Voice Data Bits field will be interpreted at the new coding rate.
Table 4-J Rate Selection Using Control_1 and Control_2
Although not listed in Table 4-J, coding rates between 2400 and 9600 with FEC rates
selectable in 50bps. increments can be achieved. Contact DVSI for the Control_1 and
Control_2 values for speech/FEC rate combinations not listed here.
The volume configuration frame allows the user to adjust the gains on the input and
output volumes.
response. For best results these settings should not be adjusted from the defaults. If
the encoder and decoder in the transmission path are kept at the default levels then
the system will maintain unity gain. Adjusting these gains above the default values
should be done knowing that clipping can result from higher gain values.
This control frame is used in conjunction with normal voice frame data in the Voice
Data Bits field.
4-G
Table 4-J Table 4-J 0x0000 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX 0xXXXX
Control_1
0xA3A0
0xA3C0
0x4130
0x4130
0x6148
0x5148
0x6150
0xA360
0xA360
0x6160
0x5160
0xA380
0xA390
0xE4A0
0xE4C0
The AMBE-1000 is not recommended for new designs.
Please refer to the AMBE-2000/2020 product line.
Adjustment from the default values is not necessary for ideal
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Control_2
0x0000
0x0001
0x0000
0x0020
0x0020
0x0000
0x0020
0x9006
0x9400
0x9600
0x9800
0x0020
0x9A00
0x0000
0xF200
page 38
Speech Rate
2400 bps
2350 bps
3600 bps
3350 bps
3750 bps
4800 bps
4550 bps
3600 bps
2550 bps
4150 bps
4400 bps
7750 bps
4650 bps
9600 bps
4850 bps
Voice Data Bits (at newly selected coding rate)
FEC Rate
0
50 bps
0
250 bps
250 bps
0
250 bps
1200 bps
2250 bps
2250 bps
2800 bps
250 bps
3350 bps
0
4750 bps
The Control_0 field is
Total Rate
2400 bps
3600 bps
4000 bps
4800 bps
6400 bps
7200 bps
8000 bps
9600 bps