mordae/pico-sdr
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Add third LPF stage

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Jan Hamal Dvořák 2024-02-24 21:08:30 +01:00
parent 813a23e699
commit 44dfa7e043
1 changed files with 14 additions and 0 deletions
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14
src/main.c
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@ -544,6 +544,11 @@ static void rf_rx(void)
int lpIa2 = 0;
int lpQa2 = 0;
static int lpIh3[LPF_SIZE];
static int lpQh3[LPF_SIZE];
int lpIa3 = 0;
int lpQa3 = 0;
int64_t dcI = 0, dcQ = 0;
int noise_floor = sqrt((float)CLK_SYS_HZ / BANDWIDTH * DECIMATION * 3.0 / 4.0);
@ -606,6 +611,15 @@ static void rf_rx(void)
I = lpIa2 / LPF_SIZE;
Q = lpQa2 / LPF_SIZE;
lpIa3 += I - lpIh3[lpP];
lpQa3 += Q - lpQh3[lpP];
lpIh3[lpP] = I;
lpQh3[lpP] = Q;
I = lpIa3 / LPF_SIZE;
Q = lpQa3 / LPF_SIZE;
int64_t I64 = (int64_t)I << 32;
int64_t Q64 = (int64_t)Q << 32;