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FIX: absolute value when comparing against threhold

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iceman1001 2017-10-30 20:03:36 +01:00
parent db56ca11a3
commit 9632d91240
1 changed files with 3 additions and 3 deletions
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6
client/graph.c
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@ -272,16 +272,16 @@ bool is_justnoise(int *bits, uint32_t size) {
//might not be high enough for noisy environments //might not be high enough for noisy environments
#define NOICE_AMPLITUDE_THRESHOLD 10; #define NOICE_AMPLITUDE_THRESHOLD 10;
uint32_t sum = 0, mean = 0, high = 0, low = 255; int32_t sum = 0, mean = 0, high = -127, low = 127;
for ( size_t i = 0; i < size; i++) { for ( size_t i = 0; i < size; i++) {
if ( bits[i] < low ) low = bits[i]; if ( bits[i] < low ) low = bits[i];
if ( bits[i] > high ) high = bits[i]; if ( bits[i] > high ) high = bits[i];
sum += bits[i]; sum += bits[i];
} }
mean = sum / size; mean = sum / (int)size;
// measure amplitude of signal // measure amplitude of signal
bool isnoise = (high - mean) < NOICE_AMPLITUDE_THRESHOLD; bool isnoise = ABS(high - mean) < NOICE_AMPLITUDE_THRESHOLD;
if (g_debugMode == 2) if (g_debugMode == 2)
PrintAndLog("DEBUG: (is_justnoise) mean %u | hi %u | low %u | IS NOISE %c", mean, high, low, isnoise?'Y':'N'); PrintAndLog("DEBUG: (is_justnoise) mean %u | hi %u | low %u | IS NOISE %c", mean, high, low, isnoise?'Y':'N');