User`s manual

AMBE-3000™-HDK Development Board
User’s Manual Version 1.1
Page 24
DVSI Confidential Proprietary
Operation
There are 8 HDK mode options to select from. The HDK modes are described in Table 20 HDK
Modes
HDK Mode settings Form
at
-mode <selection> where selection may be one of the following
idle with this selection the PC switches the HDK into an idle mode where is ready to receive
setup and control commands
codec
with this mode the PC controls the HDK to set the AMBE-3000™ vocoder chip into codec
mode. The HDK is then able to play an audio file out the analog audio output, or record
the audio input to a file or do both at the same time. Using this selection the HDK will
keep the AMBE-3000™ in Codec mode until switched out via a new selection.
packet
with this mode the PC controls the HDK to set the AMBE-3000™ vocoder chip into packet
mode. The HDK is then able to encode a PCM file and save it to the PC, or Decode an
encoded file and save it to the PC, or do both at the same time. Using this selection the
HDK will keep the AMBE-3000™ in Packet mode until switched out via a new selection.
loopback
for this mode, the PC controls the HDK to configure the AMBE-3000™, into codec mode.
The AMBE-3000™ encodes speech samples received via the codec interface. Packets
from the AMBE-3000 are received via the MSP and then sent back to the AMBE-3000™
for decoding. The decoded samples are output via the codec interface.
dualhdk
for this mode, the HDK configures the AMBE-3000™, and switches it to codec mode.
The AMBE-3000™ encodes speech samples received via the codec interface. Packets
from the AMBE-3000™ are received via the MSP and sent out over P2 which is assumed
to be connected to another HDKs P2. Simultaneously the MSP receives channel packets
from P2 and sends it to the AMBE-3000™, which decodes the packets. The decoded
speech samples are output via the codec interface.
dualhdkskew
This mode is the same as dualhdk mode except that skew control is enabled on the
AMBE-3000™. The AMBE-3000™ produces packets at the same rate which packets are
received.
a3kdirect
for this mode, the HDK configures the AMBE-3000™ to operate in packet mode using the
UART interface (P1). This allows packets to be sent directly to the AMBE-3000™ without
having the MSP involved. For example, if P1 is connected to a PC, a custom program or
a terminal program running on the PC can send/receive packets to/from the AMBE-
3000™ vocoder chip
[Vocoder Options]
The HDK provides the ability to set the data rate and noise suppression of the AMBE-3000™
Vocoder chip.
Vocoder Options Format
-r <”rate index#” or “custom rate words”>
where the ”rate index#” sets the bit rate of the AMBE-3000™ encoder/decoder See
Table 23 Standard Rate Table for AMBE-3000. Or if “custom rate words” are used to set
the rate – the format must be six words in hexdecimal format separated by a space as shown in
the following example:
-r 0x0460 0x0986 0x0000 0x0000 0x0000 0x5660