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rtl_sdr_fm: fix low_pass_simple - normalize to avoid amplitude growth/clipping

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arancormonk
2025-09-04 10:06:11 -04:00
parent 48b032e47a
commit 09bf040810
1 changed files with 3 additions and 3 deletions
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6
src/rtl_sdr_fm.cpp
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@@ -1373,9 +1373,9 @@ int low_pass_simple(int16_t *signal2, int len, int step)
for(i2=0; i2<step; i2++) {
sum += (int)signal2[i + i2];
}
//signal2[i/step] = (int16_t)(sum / step);
/* Saturate accumulated sum on write */
signal2[i/step] = sat16(sum);
// normalize by step with rounding
int val = (sum >= 0) ? (sum + step/2) / step : -(((-sum) + step/2) / step);
signal2[i/step] = (int16_t)val;
}
signal2[i/step + 1] = signal2[i/step];
return len / step;