AMBE-2000 Digital Voice Systems, Inc., AMBE-2000 Datasheet - Page 30

• 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.

Rate Information Selector (RIS):
Use these 2 bits to select which part(s) of the vocoder will be affected by the rate selection words.
Echo Canceller (EC):
Set this bit to 1 to enable the echo cancel function on a frame-by-frame basis. This must be set to 1 in every packet sent to
continue use.
Sleep (SL):
Set this bit to 1 to enter Sleep mode on a frame-by-frame basis. Sleep is a low power mode, not to be confused with Power
Down Mode. The sleep function must be enabled in every packet to continue in sleep mode. Set this bit to 0 to exit Sleep
mode.
VAD:
In order to set the Voice Activity Detector on, set the VAD bit to 1. To disable Voice Activity Detection, set the VAD bit to 0.
5.2.10
5.2.11
This is the field that contains the actual coded bits. Input of the data begins with the MSB of the first word in this field and
continues through with the final bit output being the LSB of the final word. If the data rate selected is less than 9600bps then
the unused bits in each frame are zero and populate the end of the field. As is noted in the Channel Interface definitions, these
unused bits must still be clocked out of the AMBE-2000™. The packet must always consist of 24 words.
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Table 5-H Rate Information Selection Codes
0x0
0x1
0x2
0x3
Value
AMBE-2000™ Vocoder Chip
User’s Manual Version 4.0
Encoder and Decoder
Encoder only
Decoder only
Neither Encoder nor Decoder
Area Controlled
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