9 Commits

Author	SHA1	Message	Date
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