Specifications

Net-2000™ VCU Users Manual
Version 4.0, December, 2013
File Mo
de
<input_file> is the file containing the 16-bit linear PCM
<output_file> is the file to write channel bits to
NOTE:
The Net-2000 MUST be running in File mode before executing this program.
Th
e input files when encoding should be raw 16-bit linear PCM samples in little-endian (PC) byte-order. No
headers or format descriptions should be included in the file, only the 8kHz samples. The output files contain the
vocoder bits with one byte per vocoder bit. The net2k encoder output is always hard-decision -- i.e., each byte in the
output file will either take the value zero (0) or one (1). For the mu-law and A-law encoder the output is 8-bit mu-
law or A-law samples with one byte per sample.
5.4.2 EXAMPLE (decode):
To decode an encoder output file into synthesized speech use the following command:
net2k_file -ip <net2k_ip_addr> -r <vocoder_type>,<index_no.> -sdbits <n_sdbits> -d <input_file> <output_file>
where
<net2k_ip_addr> is the IP address of the net2k
<vocoder_type> SEE ABOVE LIST
Soft Decision ONLY applies to the AMBE+™, AMBE+2™ , GMR-1 and GMR-2+ Vocoders
<n_sdbits> are the number of soft-decision bits per channel bit (1-4)
<input_file> is the input file for the decoder
<output_file> is the output file for the decoder
Input files should contain one channel bit per byte scaled to the desired number of soft-decision bits. For example,
if one soft-decision bit is used each byte should take the value zero (0) or one (1). If eight soft decision bits are
used, the most confident zero is zero (0x00) and the most confident one is 255 (0xff). Output files are in raw 16-bit
linear pcm with no headers or format descriptions. For the mu-law and A-law decoders the channel data is assumed
to contain one mu-law or A-law sample in each byte.
(Subject to Change) Page 35
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