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CHG: some average / mean functions to enhance justNoise functions.

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FIX: 'lf t55xx' - verifying that collected signal is not just noise..
This commit is contained in:
iceman1001 2017-10-30 16:44:04 +01:00
commit 6f948be842
5 changed files with 105 additions and 55 deletions
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39
client/graph.c
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@ -7,14 +7,7 @@
//-----------------------------------------------------------------------------
// Graph utilities
//-----------------------------------------------------------------------------
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include "ui.h"
#include "graph.h"
#include "lfdemod.h"
#include "cmddata.h" //for g_debugmode
int GraphBuffer[MAX_GRAPH_TRACE_LEN];
int GraphTraceLen;
@ -81,13 +74,12 @@ void setGraphBuf(uint8_t *buf, size_t size) {
return;
}
size_t getFromGraphBuf(uint8_t *buf) {
if (buf == NULL ) return 0;
uint32_t i;
for (i=0; i < GraphTraceLen; ++i){
if (GraphBuffer[i] > 127) GraphBuffer[i] = 127; //trim
if (GraphBuffer[i] < -127) GraphBuffer[i] = -127; //trim
buf[i] = (uint8_t)(GraphBuffer[i]+128);
buf[i] = (uint8_t)(GraphBuffer[i] + 128);
}
return i;
}
@ -110,17 +102,19 @@ void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
if ( loopMax > GraphTraceLen)
loopMax = GraphTraceLen;
*high = -255; *low = 255;
for (uint8_t i = 0; i < loopMax; ++i) {
if (GraphBuffer[i] > *high)
*high = GraphBuffer[i];
else if (GraphBuffer[i] < *low)
*low = GraphBuffer[i];
if (GraphBuffer[i] > *high) *high = GraphBuffer[i];
if (GraphBuffer[i] < *low) *low = GraphBuffer[i];
}
//12% fuzz in case highs and lows aren't clipped
if (addFuzz) {
*high = (int)(*high * .88);
*low = (int)(*low * .88);
*high *= .88;
*low *= .88;
//*high = (int)(*high * .88);
//*low = (int)(*low * .88);
}
}
@ -272,12 +266,19 @@ uint8_t fskClocks(uint8_t *fc1, uint8_t *fc2, uint8_t *rf1, bool verbose, int *f
}
// test samples are not just noise
bool is_justnoise(int *bits, int size) {
bool is_justnoise(int *bits, uint32_t size) {
//might not be high enough for noisy environments
#define THRESHOLD 15;
#define NOICE_THRESHOLD 15;
// if we take the mean on the sample set and see if its
// below the threshold, it will be a better indicator
int32_t mean = compute_mean_int(bits, size);
return mean < NOICE_THRESHOLD;
/*
bool isNoise = true;
for(int i=0; i < size && isNoise; i++){
for(int i=0; i < size && isNoise; i++)
isNoise = bits[i] < THRESHOLD;
}
return isNoise;
*/
}