User`s manual

Page 39
DVSI Confidential Proprietary
USB-3000™
User’s Manual
Version 1.6a
Section 3- Operation
Digital Voice Systems, Inc.
The Speech Compression Specialists
Vocoder Options Format
r- <”rate index#” or “custom rate words”>
ate index#” sets the bit rate of the AMBE-3000™ encoder. Alternatively, if “custom rate
ed by a space
s shown in the following example:
0000 0x0000 0x0000 0x5660
>
where the noise suppression is either turned off (state=0) or on (state=1) (default=on)
roces
d
with this selection, the USB-3000™ decodes channel packet data from the file <file_in>. The data in
is expected to be in hard decision (8 bits per byte) format. Refer to the AMBE-3000™ Vocoder
with this selection, the USB-3000™ decodes channel packet data from the file <file_in>. The data in
e <file_in> is decoded. The data in the <file_in> is expected to be in 4-bit soft decision (2 bits per byte)
der Chip Users Manual Section 6.9 CHAND4 field description. The
3.5.1. To Encode Packets
e a file from the PC, the (.pcm suffix) file input to the USB-3000™ via USB interface must
e 16-bit linear PCM data sampled at 8kHz. The file from the PC will be encoded by the AMBE-3000™ and
then sent back to PC and saved as the (.bit) file as named in the command line.
Enco
where the ”r
words” are used to set the rate – the format must be six words in hexadecimal format separat
a
-r 0x0460 0x0986 0x
-ns <st
ate
[P s Selection]
This is the selection of what process the USB-3000™ is to perform, where selection may be one of the
following:
-enc
with this selection, the USB-3000 USB encodes speech packets from the <file_in>. The USB-3000™
will then respond back to the PC with Channel packets where the channel data is stripped from the packet an
written to <file_out>. When complete, the USB-3000™ is ready to process more packets.
-dec
the <file_in>
Chip Users Manual Section 6.9 CHAND field description. The speech packets are then sent back to the PC
where the Speech data is extracted and written to the <file_out>. When complete, the USB-3000™ is ready to
process more packets.
-decsd
th
format. Refer to the AMBE-3000™ Voco
speech packets are then sent back to the PC where the Speech data is extracted and written to the <file_out>.
When complete, the USB-3000™ is ready to process more packets.
-enc is used to encod
b
de File Example
C:\ Command Prompt
- ’ X
usb3kcom.exe –port COM4 460800 –r 39 -enc dvsi.pcm dvsi36tst.bit
Figure 37 Encode File command line example
where
COM4 is the COM port on the PC that the USB-3000™ will communicate on
460800 is the baud rate of the PC connection