54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
#include "ModemLSB.h"
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ModemLSB::ModemLSB() : ModemAnalog() {
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// half band filter used for side-band elimination
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ssbFilt = resamp2_crcf_create(12,-0.25f,60.0f);
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demodAM_LSB = ampmodem_create(0.5, 0.0, LIQUID_AMPMODEM_LSB, 1);
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}
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Modem *ModemLSB::factory() {
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return new ModemLSB;
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}
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std::string ModemLSB::getName() {
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return "LSB";
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}
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ModemLSB::~ModemLSB() {
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resamp2_crcf_destroy(ssbFilt);
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ampmodem_destroy(demodAM_LSB);
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}
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int ModemLSB::checkSampleRate(long long sampleRate, int audioSampleRate) {
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if (sampleRate < 1500) {
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return 1500;
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}
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if (sampleRate % 2 == 0) {
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return sampleRate;
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}
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return sampleRate+1;
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}
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int ModemLSB::getDefaultSampleRate() {
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return 5400;
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}
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void ModemLSB::demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *audioOut) {
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ModemKitAnalog *akit = (ModemKitAnalog *)kit;
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initOutputBuffers(akit,input);
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if (!bufSize) {
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input->decRefCount();
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return;
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}
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liquid_float_complex x, y;
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for (int i = 0; i < bufSize; i++) { // Reject upper band
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resamp2_crcf_filter_execute(ssbFilt,input->data[i],&x,&y);
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ampmodem_demodulate(demodAM_LSB, x, &demodOutputData[i]);
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}
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buildAudioOutput(akit, audioOut, true);
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}
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