mordae/pico-sdr
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Use more sensible output scaling

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Jan Hamal Dvořák 2024-02-24 21:08:53 +01:00
parent 44dfa7e043
commit a228223799
1 changed files with 3 additions and 7 deletions
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src/main.c
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@ -551,8 +551,7 @@ static void rf_rx(void)
int64_t dcI = 0, dcQ = 0; int64_t dcI = 0, dcQ = 0;
int noise_floor = sqrt((float)CLK_SYS_HZ / BANDWIDTH * DECIMATION * 3.0 / 4.0); const int amp_max = (float)CLK_SYS_HZ / BANDWIDTH * DECIMATION * 3.0 / 4.0 / 2.0;
int64_t noise_floor_inv = (1ll << 32) / noise_floor;
while (true) { while (true) {
if (multicore_fifo_rvalid()) { if (multicore_fifo_rvalid()) {
@ -630,11 +629,8 @@ static void rf_rx(void)
dcQ = ((dcQ << 20) - dcQ + Q64) >> 20; dcQ = ((dcQ << 20) - dcQ + Q64) >> 20;
} }
dI = (dI * noise_floor_inv) >> 32; *blockptr++ = 127 * dI / amp_max;
dQ = (dQ * noise_floor_inv) >> 32; *blockptr++ = 127 * dQ / amp_max;
*blockptr++ = dI;
*blockptr++ = dQ;
} }
if (!queue_try_add(&iq_queue, block)) { if (!queue_try_add(&iq_queue, block)) {