fdmdv_mod - a diagnostic tool for the codec2 library to create a raw modem signal file from a codec2 bit

       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.

        fdmdv_mod hts1a.c2 hts1a_fdmdv.raw

       fdmdv_mod  - a diagnostic tool for the codec2 library to create a raw modem signal file from a codec2 bit
       file.

       The first argument, InputBitFile is the file name of a file with codec2 encoded bits. If "-" is given the
       input is taken from stdin.

       The  second argument, OutputModemRawFile is the file name of a file to be created with modem sample data.
       If "-" is given the output is sent to stdout.

       The optional third argument, [Nc] is the number of carriers to use in the modem. The default is 14.   The
       minimum is 2 and the maximum is 20.

fdmdv_demod(1), fdmdv_get_test_bits(1) fdmdv_put_test_bits(1)

fdmdv_mod                                          2020-12-04                                       FDMDV_MOD(1)

fdmdv_modusage:InputBitFileOutputModemRawFile[Nc]