12 Commits

Author	SHA1	Message	Date
sirhc808	27d4471cde	Merge branch 'ft9_refactor' into feat-refactor ... # Conflicts: # CMakeLists.txt # lib/ft4/getcandidates4.f90 # lib/ft4/sync4d.f90	2019-07-02 12:06:14 -05:00
sirhc808	84fd0ed7c7	clean up a few warnings	2019-07-01 21:10:43 -05:00
Steve Franke	c26d0b4f29	FT4: Imrovements to sync. ... Divide DT search range into 3 segments. Search central segment (near DT=0) first and try to decode the largest peak. Then find the largest peak in each of the surrounding segments and try to decode those only if the peak is larger than the one found in the central segment. Also re-indent ft4_decode.f90 and some other minor tweaks.	2019-06-16 09:46:33 -05:00
Steve Franke	7e9cc9cbc7	FT4: Improve sync performance on disturbed channels. Make jt9 command-line option -d work	2019-06-14 16:28:59 -05:00
Steve Franke	0668c4fce0	Improve sync at large DT.	2019-05-08 11:34:16 -05:00
Steve Franke	73efc09392	Speed up sync.	2019-03-28 14:34:03 -05:00
Steve Franke	ecbeda5297	Disable sync2 calculation for now.	2019-02-07 10:16:28 -06:00
Steve Franke	71cb6d9f50	Use 4 different Costas arrays to prevent false syncs as received frames move ... through the analysis window. Add a random 77-bit vector to each message so that tone transitions occur even if the message contains a long string of 0 or 1 (like a CQ). Add alternative sync calculation as an option (sync2), for testing. Add basic framework for AP decoding.	2019-02-05 19:18:50 -06:00
Steve Franke	fdb84c0e63	Fix an off-by-one error.	2019-01-30 19:19:38 -06:00
Steve Franke	66bb999126	Improve ft4_downsample filter. Improve getcandidates4.	2019-01-30 12:47:01 -06:00
Steve Franke	613bfaf3ee	Change ft4 to use (174,91) code and 512 Sa/symbol.	2019-01-26 23:03:54 -06:00
Steve Franke	66e3f11fba	Add ft4 files in lib/ft4.	2019-01-25 16:01:34 -06:00