GitHub/dsd-fme
1
0
Fork 0
mirror of https://github.com/lwvmobile/dsd-fme.git synced 2026-11-13 17:27:21 -05:00
Code Issues Packages Projects Releases Wiki Activity

NXDN48 Voice Decoding is Good Now

Browse Source 
NXDN48 Voice Decoding is Good Now

Just use squelch if using SDR++ or GQRX to feed it. RTL-SDR input mode and NXDN still makes tons of false positives, and doesn't work well at all. May just be a bad signal issue but still think the RTLSDR input uses wrong center freq/tuned freq/"optimizations", need to get back to that some time, maybe also implement squelch settings on rtl_fm mode.

Thanks to LouisErigHerve for his 'Improved NXDN Detection' update on his version, implemented it and works SO MUCH BETTER!

May still disable the if ((state->lastsynctype == 9) || (state->lastsynctype == 17)) condition in dsd_frame_sync.c if I think it leads to more consistent decoding vs false positives. USE SQUELCH!
This commit is contained in:
lwvmobile
2022-01-31 23:54:14 -05:00
committed by GitHub
parent 93ccc668d7
commit 1e95db0977
4 changed files with 134 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
include/dsd.h
View File

@@ -248,7 +248,7 @@ typedef struct
#define INV_DSTAR_HD "313131313111311331313333"
#define DSTAR_SYNC "313131313133131113313111"
#define INV_DSTAR_SYNC "131313131311313331131333"
// original sync numbers which is FSW plus LICH
#define NXDN_MS_DATA_SYNC "313133113131111333"
#define INV_NXDN_MS_DATA_SYNC "131311331313333111"
#define NXDN_MS_VOICE_SYNC "313133113131113133"
@@ -258,6 +258,19 @@ typedef struct
#define INV_NXDN_BS_VOICE_SYNC "131311331313331331"
#define NXDN_BS_VOICE_SYNC "313133113131113113"
//Try using only FSW and no LICH
/*
#define NXDN_MS_DATA_SYNC "3131331131"
#define INV_NXDN_MS_DATA_SYNC "1313113313"
#define NXDN_MS_VOICE_SYNC "313133113131113133"
#define INV_NXDN_MS_VOICE_SYNC "131311331313331311"
#define INV_NXDN_BS_DATA_SYNC "1313113313"
#define NXDN_BS_DATA_SYNC "3131331131"
#define INV_NXDN_BS_VOICE_SYNC "131311331313331331"
#define NXDN_BS_VOICE_SYNC "313133113131113113"
//how do two values equate to 4 symbol types? shouldn't it be -3, -1, 1, 3?
*/
#define DMR_BS_DATA_SYNC "313333111331131131331131"
#define DMR_BS_VOICE_SYNC "131111333113313313113313"
#define DMR_MS_DATA_SYNC "311131133313133331131113"
@@ -327,6 +340,10 @@ void processDSTAR_HD (dsd_opts * opts, dsd_state * state);
short dmr_filter(short sample);
short nxdn_filter(short sample);
//borrow from LEH for testing 'improved NXDN detection'
int strncmperr(const char *s1, const char *s2, size_t size, int MaxErr);
//
#ifdef __cplusplus
extern "C" {
#endif