From 17d3d0a62127bf18cb3c3585e33aed72c6f52860 Mon Sep 17 00:00:00 2001
From: wb2osz <wb2osz@comcast.net>
Date: Sun, 18 Dec 2022 20:19:37 +0000
Subject: [PATCH] Increase max AFSK filter size.
---
src/fsk_demod_state.h | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/src/fsk_demod_state.h b/src/fsk_demod_state.h
index bf8d23b..efb9d2c 100644
--- a/src/fsk_demod_state.h
+++ b/src/fsk_demod_state.h
@@ -2,6 +2,8 @@
#ifndef FSK_DEMOD_STATE_H
+#include <stdint.h> // int64_t
+
#include "rpack.h"
#include "audio.h" // for enum modem_t
@@ -43,8 +45,9 @@ typedef struct cic_s {
} cic_t;
-#define MAX_FILTER_SIZE 404 /* 401 is needed for profile A, 300 baud & 44100. Revisit someday. */
-
+#define MAX_FILTER_SIZE 480 /* 401 is needed for profile A, 300 baud & 44100. Revisit someday. */
+ // Size comes out to 417 for 1200 bps with 48000 sample rate
+ // v1.7 - Was 404. Bump up to 480.
struct demodulator_state_s
{
@@ -216,6 +219,12 @@ struct demodulator_state_s
signed int prev_d_c_pll; // Previous value of above, before
// incrementing, to detect overflows.
+ int pll_symbol_count; // Number symbols during time nudge_total is accumulated.
+ int64_t pll_nudge_total; // Sum of DPLL nudge amounts.
+ // Both of these are cleared at start of frame.
+ // At end of frame, we can see if incoming
+ // baud rate is a little off.
+
int prev_demod_data; // Previous data bit detected.
// Used to look for transitions.
float prev_demod_out_f;