mordae/pico-sdr
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Slightly increase numerical precision

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This commit is contained in:
Jan Hamal Dvořák 2024-02-24 22:55:35 +01:00
parent 34c070ed42
commit daea0dd8bf
1 changed files with 8 additions and 2 deletions

10
src/main.c
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@ -594,6 +594,9 @@ static void rf_rx(void)
int I = cos_neg - cos_pos; int I = cos_neg - cos_pos;
int Q = sin_neg - sin_pos; int Q = sin_neg - sin_pos;
I <<= 8;
Q <<= 8;
int lpP = d & (LPF_SIZE - 1); int lpP = d & (LPF_SIZE - 1);
lpIa1 += I - lpIh1[lpP]; lpIa1 += I - lpIh1[lpP];
@ -623,6 +626,9 @@ static void rf_rx(void)
I = lpIa3 / LPF_SIZE; I = lpIa3 / LPF_SIZE;
Q = lpQa3 / LPF_SIZE; Q = lpQa3 / LPF_SIZE;
I >>= 8;
Q >>= 8;
dI += I; dI += I;
dQ += Q; dQ += Q;
} }
@ -630,8 +636,8 @@ static void rf_rx(void)
dcI = ((dcI << 13) - dcI + (dI << 19)) >> 13; dcI = ((dcI << 13) - dcI + (dI << 19)) >> 13;
dcQ = ((dcQ << 13) - dcQ + (dQ << 19)) >> 13; dcQ = ((dcQ << 13) - dcQ + (dQ << 19)) >> 13;
dI -= dcI >> 19; dI = ((dI << 19) - dcI) >> 19;
dQ -= dcQ >> 19; dQ = ((dQ << 19) - dcQ) >> 19;
if (dI > amp_max) if (dI > amp_max)
dI = amp_max; dI = amp_max;