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updating_comments (#2191)

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Brumi-2021 2024-07-08 11:11:12 +02:00 • committed by GitHub
parent 032168234a
commit 9ef58b7763
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4 changed files with 7 additions and 12 deletions
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11
firmware/baseband/dsp_modulate.cpp
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@ -84,18 +84,13 @@ SSB::SSB()
void SSB::set_fs_div_factor(float new_bw_ssb) {
switch ((int)new_bw_ssb / 1000) {
case 2:
fs_div_factor = 192; // TXBW_ssb = 2khz = fs/4 ; fs of Hilbert Transform => 8khz fs Hilbert = 1536.000/8000= 192
fs_div_factor = 192; // TXBW_ssb = 2khz = BW_cut_off LPF = fs/4 ; BW_HT fs Hilbert Transform (4khz=fs/2) ==> (8k=fs) Hilbert_fs = 1.536.000/8000= 192
break;
case 3:
fs_div_factor = 128; // TXBW_ssb = 3khz = fs/4 ; fs of Hilbert Transform => 12khz fs Hilbert = 1536.000/12000= 128
fs_div_factor = 128; // TXBW_ssb = 3khz = BW_cut_off LPF = fs/4 ; BW_HT fs Hilbert Transform (6khz=fs/2) ==> (12k=fs) Hilbert_fs = 1.536.000/12000= 128
break;
/* TODO pending to investigate 4khz, now is making aliasing folding with audio sweep .
case 4:
fs_div_factor = 96; // TXBW_ssb = 4khz = fs/4 ; fs of Hilbert Transform => 16khz fs Hilbert = 1536.000/16000= 96
break;
*/
default:
fs_div_factor = 128; // TXBW_ssb = 3khz = fs/4 ; fs of Hilbert Transform => 12khz fs Hilbert = 1536.000/12000= 128
fs_div_factor = 128; // TXBW_ssb = 3khz = BW_cut_off LPF = fs/4 ; BW_HT fs Hilbert Transform (6khz=fs/2) ==> (12k=fs) Hilbert_fs = 1.536.000/12000= 128
break;
}
}