AFG/dump1090
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Fix a thinko in computing the log10 table.

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(This shouldn't actually affect the resulting SNR since it's just a constant offset, and the errors in signal and noise will cancel out)
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Oliver Jowett 2014-09-23 14:05:25 +01:00
parent 76c958b03e
commit 83d256e984
1 changed files with 1 additions and 1 deletions
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dump1090.c
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@ -189,7 +189,7 @@ void modesInit(void) {
// Prepare the log10 lookup table. // Prepare the log10 lookup table.
// This maps from a magnitude value x (scaled as above) to 100log10(x) // This maps from a magnitude value x (scaled as above) to 100log10(x)
for (i = 0; i <= 65535; i++) { for (i = 0; i <= 65535; i++) {
int l10 = (int) round(100 * log10( (i + 365.4798) * 258.433254) ); int l10 = (int) round(100 * log10( (i + 365.4798) / 258.433254) );
Modes.log10lut[i] = (uint16_t) ((l10 < 65535 ? l10 : 65535)); Modes.log10lut[i] = (uint16_t) ((l10 < 65535 ? l10 : 65535));
} }