mordae/pico-sdr
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Optimize DC removal a bit

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This commit is contained in:
Jan Hamal Dvořák 2024-06-06 20:59:07 +02:00
parent 48c4c2dc40
commit 7d4b890a7f
1 changed files with 6 additions and 4 deletions
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10
src/main.c
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@ -476,8 +476,9 @@ static void rf_rx(void)
int I32 = cos_neg - cos_pos;
int64_t I = I32;
dcI = ((dcI << 16) - dcI + (I << 16)) >> 16;
I -= dcI >> 16;
int64_t I16 = I << 16;
dcI = ((dcI << 16) - dcI + I16) >> 16;
I = (I16 - dcI) >> 16;
I *= gain;
I /= max_amplitude;
@ -489,8 +490,9 @@ static void rf_rx(void)
int Q32 = sin_neg - sin_pos;
int64_t Q = Q32;
dcQ = ((dcQ << 16) - dcQ + (Q << 16)) >> 16;
Q -= dcQ >> 16;
int64_t Q16 = Q << 16;
dcQ = ((dcQ << 16) - dcQ + Q16) >> 16;
Q = (Q16 - dcQ) >> 16;
Q *= gain;
Q /= max_amplitude;