.TH FDMDV_MOD 1 2020-12-04 fdmdv_mod "User commands"
.SH NAME
fdmdv_mod \- a diagnostic tool for the codec2 library to create a raw modem
signal file from a codec2 bit file.
.SH SYNOPSIS
.B fdmdv_mod usage:
.IR InputBitFile
.IR OutputModemRawFile
.IR [Nc]
.PP
.SH DESCRIPTION
.PP
Given an input file of bits outputs a raw file (8kHz, 16 bit shorts)
of FDMDV modem samples ready to send over a HF radio channel.  The
input file is assumed to be arranged as codec frames of 56 bits (7
bytes) which we send as two 28 bit modem frames.
.PP
.SH EXAMPLE
 fdmdv_mod hts1a.c2 hts1a_fdmdv.raw
.PP
.SH OPTIONS
The first argument, 
.IR InputBitFile
is the file name of a file with codec2 encoded bits. If "-" is
given the input is taken from stdin.
.PP
The second argument, 
.IR OutputModemRawFile
is the file name of a file to be created with modem sample data. If "-" is
given the output is sent to stdout.
.PP
The optional third argument,
.IR [Nc]
is the number of carriers to use in the modem. The default is 14.
The minimum is 2 and the maximum is 20.
.PP
.SH "SEE ALSO"
.BR fdmdv_demod (1),
.BR fdmdv_get_test_bits (1)
.BR fdmdv_put_test_bits (1)