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.TH DRS232_LDPC 1 2020-12-04 drs232_ldpc "User commands"
.SH NAME
drs232_ldpc \- Horus SSTV reception using the codec2 library.
.SH SYNOPSIS
.B drs232_ldpc usage:
.IR InputOneBitPerChar
.IR OutputPacket
.IR [-v[v]]
.PP
.SH DESCRIPTION
.PP
Looks for a unique word in series of soft decision symbols. When
found, deframes a RS232 encoded frame of soft decision bit, LDPC
decodes, and outputs a frame of packed bytes. Used for high bit
rate Horus SSTV reception.
.PP
Frame format:
.PP
16 bytes 0x55 - 0xabcdef01 UW - 256 bytes of payload - 2 bytes CRC - 65 bytes LPDC Parity
.PP
Each byte is encoded as a 10 bit RS232 serial word:
.PP
0 LSB .... MSB 1
.PP
.SH OPTIONS
The first argument,
.IR InputOneSymbolPerFloat
is the file name of a file with Horus encoded bits. If "-" is
given the input is taken from stdin.
.PP
The second argument,
.IR OutputPackets
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 [-v]
.IR [-vv]
set the verbosity of the output.
.PP
.SH "SEE ALSO"
.BR drs232 (1),
.BR fdmdv_mod (1),
.BR fdmdv_demod (1),
.BR fdmdv_get_test_bits (1),
.BR fdmdv_put_test_bits (1)
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