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Invest limit bw ssb to 3 k (#2188)

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* Adding_TX_BW_user_selection_to_the_Mic_SSB_mode

* TX_SSB_BW_adjustm_2k_3k_4k

* init_value_correction

* Comment_correction

* Leaving_only_OK_txbw_SSB_2K_3K

* Limti_SSB_TX_BW_2K_3K
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Brumi-2021 2024-07-06 13:34:09 +02:00 • committed by GitHub
parent b53b5c70d3
commit 032168234a
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GPG key ID: B5690EEEBB952194
7 changed files with 73 additions and 18 deletions
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13
firmware/baseband/dsp_hilbert.cpp
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@ -27,6 +27,7 @@ namespace dsp {
HilbertTransform::HilbertTransform() {
n = 0;
sos_input.configure(half_band_lpf_config);
sos_i.configure(half_band_lpf_config);
sos_q.configure(half_band_lpf_config);
}
@ -34,22 +35,26 @@ HilbertTransform::HilbertTransform() {
void HilbertTransform::execute(float in, float& out_i, float& out_q) {
float a = 0, b = 0;
float in_filtered = sos_input.execute(in) * 1.0f; // Anti-aliasing LPF at fs/4 mic audio filter front-end.
// it is exactly matching with the usefull mic BW_cut_off =fs/4 of the following Hilbert Transf. implementation
// Ex. to TX SSB 3khz BW (3KHZ =fs/4) ,we need to run Hiblert_Trf fs = 12khz . And our anti-aliasing filter is also fcut =fs/4 when we use a half_band_LPF .
switch (n) {
case 0:
a = in;
a = in_filtered;
b = 0;
break;
case 1:
a = 0;
b = -in;
b = -in_filtered;
break;
case 2:
a = -in;
a = -in_filtered;
b = 0;
break;
case 3:
a = 0;
b = in;
b = in_filtered;
break;
}