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https://github.com/cjcliffe/CubicSDR.git
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Bonus SSB optimize/tweak
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cc189cc274
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090d751482
@ -2,12 +2,12 @@
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ModemLSB::ModemLSB() : ModemAnalog() {
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ModemLSB::ModemLSB() : ModemAnalog() {
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// half band filter used for side-band elimination
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// half band filter used for side-band elimination
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demodAM_LSB = ampmodem_create(0.5, 0.0, LIQUID_AMPMODEM_LSB, 1);
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demodAM_LSB = ampmodem_create(0.25, 0.25, LIQUID_AMPMODEM_LSB, 1);
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// options
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// options
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float fc = 0.25f; // filter cutoff frequency
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float fc = 0.25f; // filter cutoff frequency
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float ft = 0.05f; // filter transition
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float ft = 0.05f; // filter transition
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float As = 90.0f; // stop-band attenuation [dB]
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float As = 90.0f; // stop-band attenuation [dB]
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float mu = 0.0f; // fractional timing offset
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float mu = 0.5f; // fractional timing offset
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// estimate required filter length and generate filter
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// estimate required filter length and generate filter
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unsigned int h_len = estimate_req_filter_len(ft,As);
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unsigned int h_len = estimate_req_filter_len(ft,As);
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@ -57,14 +57,13 @@ void ModemLSB::demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *a
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return;
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return;
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}
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}
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liquid_float_complex x, y;
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liquid_float_complex x;
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for (int i = 0; i < bufSize; i++) { // Reject upper band
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for (int i = 0; i < bufSize; i++) { // Reject upper band
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nco_crcf_step(ssbShift);
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nco_crcf_step(ssbShift);
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nco_crcf_mix_up(ssbShift, input->data[i], &x);
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nco_crcf_mix_up(ssbShift, input->data[i], &x);
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firfilt_crcf_push(ssbFilt, x);
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firfilt_crcf_push(ssbFilt, x);
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firfilt_crcf_execute(ssbFilt, &x);
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firfilt_crcf_execute(ssbFilt, &x);
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nco_crcf_mix_down(ssbShift, x, &y);
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ampmodem_demodulate(demodAM_LSB, x, &demodOutputData[i]);
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ampmodem_demodulate(demodAM_LSB, y, &demodOutputData[i]);
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}
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}
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buildAudioOutput(akit, audioOut, true);
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buildAudioOutput(akit, audioOut, true);
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@ -2,12 +2,12 @@
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ModemUSB::ModemUSB() : ModemAnalog() {
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ModemUSB::ModemUSB() : ModemAnalog() {
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// half band filter used for side-band elimination
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// half band filter used for side-band elimination
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demodAM_USB = ampmodem_create(0.5, 0.0, LIQUID_AMPMODEM_USB, 1);
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demodAM_USB = ampmodem_create(0.25, -0.25, LIQUID_AMPMODEM_USB, 1);
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// options
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// options
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float fc = 0.25f; // filter cutoff frequency
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float fc = 0.25f; // filter cutoff frequency
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float ft = 0.05f; // filter transition
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float ft = 0.05f; // filter transition
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float As = 90.0f; // stop-band attenuation [dB]
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float As = 90.0f; // stop-band attenuation [dB]
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float mu = 0.0f; // fractional timing offset
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float mu = 0.5f; // fractional timing offset
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// estimate required filter length and generate filter
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// estimate required filter length and generate filter
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unsigned int h_len = estimate_req_filter_len(ft,As);
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unsigned int h_len = estimate_req_filter_len(ft,As);
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@ -57,14 +57,13 @@ void ModemUSB::demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *a
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return;
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return;
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}
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}
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liquid_float_complex x, y;
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liquid_float_complex x;
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for (int i = 0; i < bufSize; i++) { // Reject lower band
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for (int i = 0; i < bufSize; i++) { // Reject lower band
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nco_crcf_step(ssbShift);
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nco_crcf_step(ssbShift);
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nco_crcf_mix_down(ssbShift, input->data[i], &x);
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nco_crcf_mix_down(ssbShift, input->data[i], &x);
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firfilt_crcf_push(ssbFilt, x);
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firfilt_crcf_push(ssbFilt, x);
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firfilt_crcf_execute(ssbFilt, &x);
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firfilt_crcf_execute(ssbFilt, &x);
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nco_crcf_mix_up(ssbShift, x, &y);
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ampmodem_demodulate(demodAM_USB, x, &demodOutputData[i]);
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ampmodem_demodulate(demodAM_USB, y, &demodOutputData[i]);
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}
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}
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buildAudioOutput(akit, audioOut, true);
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buildAudioOutput(akit, audioOut, true);
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