kopia lustrzana https://github.com/rs1729/RS
mk2a/lms6-1680: --IQ demod, optional decimation
Zilog80
rodzic
884910ae9c
commit
a2222414ce
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@ -45,6 +45,11 @@
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#define M_PI (3.1415926535897932384626433832795)
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#endif
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#define LP_IQ 1
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#define LP_FM 2
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#define LP_IQFM 4
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typedef unsigned char ui8_t;
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typedef unsigned short ui16_t;
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typedef unsigned int ui32_t;
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@ -126,6 +131,7 @@ typedef struct {
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// decimate
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int opt_nolut; // default: LUT
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int opt_IFmin;
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int decM;
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ui32_t sr_base;
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@ -154,6 +160,12 @@ typedef struct {
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float *lpFM_buf;
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float *fm_buffer;
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// IQFM: lowpass
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int lpIQFM_bw;
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int lpIQFMtaps; // ui32_t
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float *ws_lpIQFM;
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float *lpIQFM_buf;
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int opt_fmdec;
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int decFM;
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@ -319,9 +331,8 @@ static int getCorrDFT(dsp_t *dsp) {
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ui32_t mpos = 0;
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ui32_t pos = dsp->sample_out;
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double dc = 0.0;
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int mp_ofs = 0;
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float *sbuf = dsp->bufs;
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float *dcbuf = dsp->fm_buffer;
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dsp->mv = 0.0;
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dsp->dc = 0.0;
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@ -330,13 +341,6 @@ static int getCorrDFT(dsp_t *dsp) {
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if (dsp->sample_out < dsp->L) return -2;
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if (dsp->opt_iq > 1 && dsp->opt_iq < 6 && dsp->opt_dc) {
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mp_ofs = (dsp->sps-1)/2;
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sbuf = dsp->fm_buffer;
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}
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else {
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sbuf = dsp->bufs;
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}
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for (i = 0; i < dsp->K + dsp->L; i++) (dsp->DFT).xn[i] = sbuf[(pos+dsp->M -(dsp->K + dsp->L-1) + i) % dsp->M];
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while (i < dsp->DFT.N) (dsp->DFT).xn[i++] = 0.0;
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@ -345,19 +349,19 @@ static int getCorrDFT(dsp_t *dsp) {
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if (dsp->opt_dc) {
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/*
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//X[0] = 0; // nicht ueber gesamte Laenge ... M10
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//
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// L < K ? // only last 2L samples (avoid M10 carrier offset)
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//dc = 0.0;
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//for (i = dsp->K - dsp->L; i < dsp->K + dsp->L; i++) dc += (dsp->DFT).xn[i];
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//dc /= 2.0*(float)dsp->L;
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dc = 0.0;
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for (i = dsp->K /*- dsp->L*/; i < dsp->K + dsp->L; i++) dc += (dsp->DFT).xn[i];
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for (i = dsp->K; i < dsp->K + dsp->L; i++) dc += (dsp->DFT).xn[i];
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dc /= 1.0*(float)dsp->L;
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dsp->DFT.X[0] -= dsp->DFT.N * dc ;//* 0.95;
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dsp->DFT.X[0] -= dsp->DFT.N * dc * 0.95; // dc * dsp->L
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*/
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dsp->DFT.X[0] = 0;
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Nidft(&dsp->DFT, dsp->DFT.X, (dsp->DFT).cx);
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for (i = 0; i < dsp->DFT.N; i++) (dsp->DFT).xn[i] = creal((dsp->DFT).cx[i])/(float)dsp->DFT.N;
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}
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@ -366,8 +370,6 @@ static int getCorrDFT(dsp_t *dsp) {
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Nidft(&dsp->DFT, dsp->DFT.Z, dsp->DFT.cx);
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if (fabs(dc) < 0.5) dsp->dc = dc;
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// relativ Peak - Normierung erst zum Schluss;
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// dann jedoch nicht zwingend corr-Max wenn FM-Amplitude bzw. norm(x) nicht konstant
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@ -388,36 +390,37 @@ static int getCorrDFT(dsp_t *dsp) {
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mpos = pos - (dsp->K + dsp->L-1) + mp; // t = L-1
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// header: mpos-L .. mpos (CA CA CA 24 52)
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// dc(header) ? -> Mk2a: 0xCA preamble, mpos-L .. mpos-2/5*L
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if (dsp->opt_dc)
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{
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dc = 0.0;
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//for (i = 0; i < dsp->L; i++) dc += sbuf[(mpos - i + dsp->M) % dsp->M];
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//dc /= (float)dsp->L; dc *= 0.8f;
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for (i = 2*dsp->L/5; i < dsp->L; i++) dc += sbuf[(mpos - i + dsp->M) % dsp->M];
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dc /= (float)dsp->L*3/5.0;
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dsp->dc = dc;
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}
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//xnorm = sqrt(dsp->qs[(mpos + 2*dsp->M) % dsp->M]); // Nvar = L
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xnorm = 0.0;
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for (i = 0; i < dsp->L; i++) xnorm += (dsp->DFT).xn[mp-i]*(dsp->DFT).xn[mp-i];
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xnorm = sqrt(xnorm);
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mx /= xnorm*(dsp->DFT).N;
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if (dsp->opt_iq > 1 && dsp->opt_iq < 6 && dsp->opt_dc) mpos += mp_ofs;
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dsp->mv = mx;
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dsp->mv_pos = mpos;
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if (pos == dsp->sample_out) dsp->buffered = dsp->sample_out - mpos;
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// FM: s = gain * carg(w)/M_PI = gain * dphi / PI // gain=0.8
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// FM audio gain? dc relative to FM-envelope?!
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//
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// header: mpos-L .. mpos (CA CA CA 24 52)
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// dc(header) ? -> Mk2a: 0xCA preamble, mpos-L .. mpos-2/5*L
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if (dsp->opt_dc)
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{
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double dc = 0.0;
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int mp_ofs = 0;
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if (dsp->opt_iq >= 2 && dsp->opt_iq < 6) {
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mp_ofs = (dsp->lpFMtaps - dsp->lpIQFMtaps - (dsp->sps-1))/(2*dsp->decFM);
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}
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dc = 0.0;
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for (i = 2*dsp->L/5; i < dsp->L; i++) dc += dcbuf[(mp_ofs + mpos - i + dsp->M) % dsp->M];
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dc /= (float)dsp->L*3/5.0;
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dsp->dc = dc;
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}
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// FM: s = gain * carg(w)/M_PI = gain * dphi / PI // gain=0.8
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// FM audio gain? dc relative to FM-envelope?!
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//
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dsp->dDf = dsp->sr * dsp->dc / (2.0*FM_GAIN); // remaining freq offset
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return mp;
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@ -677,36 +680,6 @@ static int lowpass_init(float f, int taps, float **pws) {
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}
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static int lowpass_update(float f, int taps, float *ws) {
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double *h, *w;
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double norm = 0;
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int n;
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if (taps % 2 == 0) taps++; // odd/symmetric
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if ( taps < 1 ) taps = 1;
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h = (double*)calloc( taps+1, sizeof(double)); if (h == NULL) return -1;
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w = (double*)calloc( taps+1, sizeof(double)); if (w == NULL) return -1;
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for (n = 0; n < taps; n++) {
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w[n] = 7938/18608.0 - 9240/18608.0*cos(2*M_PI*n/(taps-1)) + 1430/18608.0*cos(4*M_PI*n/(taps-1)); // Blackmann
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h[n] = 2*f*sinc(2*f*(n-(taps-1)/2));
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ws[n] = w[n]*h[n];
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norm += ws[n]; // 1-norm
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}
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for (n = 0; n < taps; n++) {
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ws[n] /= norm; // 1-norm
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}
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for (n = 0; n < taps; n++) ws[taps+n] = ws[n];
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free(h); h = NULL;
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free(w); w = NULL;
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return taps;
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}
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static float complex lowpass(float complex buffer[], ui32_t sample, ui32_t taps, float *ws) {
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ui32_t n;
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ui32_t s = sample % taps;
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@ -732,6 +705,7 @@ static float re_lowpass(float buffer[], ui32_t sample, ui32_t taps, float *ws) {
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static
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int f32buf_sample(dsp_t *dsp, int inv) {
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float s = 0.0;
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float s_fm = s;
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float complex z, w, z0;
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double gain = FM_GAIN;
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@ -749,14 +723,21 @@ int f32buf_sample(dsp_t *dsp, int inv) {
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{
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double t = _sample / (double)dsp->sr;
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if (dsp->opt_iq) {
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if (dsp->opt_iq)
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{
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if (dsp->opt_iq >= 5) {
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ui32_t s_reset = dsp->dectaps*dsp->lut_len;
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int j;
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if ( f32read_cblock(dsp) < dsp->decM ) return EOF;
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for (j = 0; j < dsp->decM; j++) {
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z = dsp->decMbuf[j] * dsp->ex[dsp->sample_dec % dsp->lut_len];
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if (dsp->opt_nolut) {
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double _s_base = (double)(_sample*dsp->decM+j); // dsp->sample_dec
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double f0 = dsp->xlt_fq*_s_base - dsp->Df*_s_base/(double)dsp->sr_base;
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z = dsp->decMbuf[j] * cexp(f0*2*M_PI*I);
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}
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else {
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z = dsp->decMbuf[j] * dsp->ex[dsp->sample_dec % dsp->lut_len];
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}
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dsp->decXbuffer[dsp->sample_dec % dsp->dectaps] = z;
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dsp->sample_dec += 1;
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if (dsp->sample_dec == s_reset) dsp->sample_dec = 0;
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@ -768,11 +749,13 @@ int f32buf_sample(dsp_t *dsp, int inv) {
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}
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else if ( f32read_csample(dsp, &z) == EOF ) return EOF;
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z *= cexp(-t*2*M_PI*dsp->Df*I);
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if (dsp->opt_dc && !dsp->opt_nolut) {
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z *= cexp(-t*2*M_PI*dsp->Df*I);
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}
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// IF-lowpass
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if (dsp->opt_lp & 1) {
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if (dsp->opt_lp & LP_IQ) {
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dsp->lpIQ_buf[_sample % dsp->lpIQtaps] = z;
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z = lowpass(dsp->lpIQ_buf, _sample, dsp->lpIQtaps, dsp->ws_lpIQ);
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}
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@ -780,83 +763,95 @@ int f32buf_sample(dsp_t *dsp, int inv) {
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z0 = dsp->rot_iqbuf[(_sample-1 + dsp->N_IQBUF) % dsp->N_IQBUF];
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w = z * conj(z0);
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s = gain * carg(w)/M_PI;
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s_fm = gain * carg(w)/M_PI;
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dsp->rot_iqbuf[_sample % dsp->N_IQBUF] = z;
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// FM-lowpass
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if (dsp->opt_lp & 2) {
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dsp->lpFM_buf[_sample % dsp->lpFMtaps] = s;
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if (m+1 == decFM) {
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s = re_lowpass(dsp->lpFM_buf, _sample, dsp->lpFMtaps, dsp->ws_lpFM);
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if (dsp->opt_iq >= 2 && dsp->opt_iq < 6)
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{
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if (0) { // not L band
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double xbit = 0.0;
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//float complex xi = cexp(+I*M_PI*dsp->h/dsp->sps);
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double f1 = -dsp->h*dsp->sr/(2*dsp->sps);
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double f2 = -f1;
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float complex X0 = 0;
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float complex X = 0;
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int n = dsp->sps;
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double tn = (_sample-n) / (double)dsp->sr;
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//t = _sample / (double)dsp->sr;
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//z = dsp->rot_iqbuf[_sample % dsp->N_IQBUF];
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z0 = dsp->rot_iqbuf[(_sample-n + dsp->N_IQBUF) % dsp->N_IQBUF];
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// f1
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X0 = z0 * cexp(-tn*2*M_PI*f1*I); // alt
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X = z * cexp(-t *2*M_PI*f1*I); // neu
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dsp->F1sum += X - X0;
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// f2
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X0 = z0 * cexp(-tn*2*M_PI*f2*I); // alt
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X = z * cexp(-t *2*M_PI*f2*I); // neu
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dsp->F2sum += X - X0;
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xbit = cabs(dsp->F2sum) - cabs(dsp->F1sum);
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s = xbit / dsp->sps;
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}
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}
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else {
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double xbit = 0.0;
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float _sps = dsp->sps * decFM;
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//float complex xi = cexp(+I*M_PI*dsp->h/dsp->sps);
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double f1 = -dsp->h*dsp->sr/(2*_sps);
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double f2 = -f1;
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dsp->fm_buffer[(_sample - dsp->lpFMtaps/2 + dsp->M) % dsp->M] = s;
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float complex X1 = 0;
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float complex X2 = 0;
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int n = _sps;
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float sk = _sps/2.4f;
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if (0 && dsp->opt_iq >= 2 && dsp->opt_iq < 6)
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{
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double xbit = 0.0;
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//float complex xi = cexp(+I*M_PI*dsp->h/dsp->sps);
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double f1 = -dsp->h*dsp->sr/(2*dsp->sps);
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double f2 = -f1;
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float complex X0 = 0;
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float complex X = 0;
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int n = dsp->sps;
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double tn = (_sample-n) / (double)dsp->sr;
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//t = _sample / (double)dsp->sr;
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//z = dsp->rot_iqbuf[_sample % dsp->N_IQBUF];
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z0 = dsp->rot_iqbuf[(_sample-n + dsp->N_IQBUF) % dsp->N_IQBUF];
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// f1
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X0 = z0 * cexp(-tn*2*M_PI*f1*I); // alt
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X = z * cexp(-t *2*M_PI*f1*I); // neu
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dsp->F1sum += X - X0;
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// f2
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X0 = z0 * cexp(-tn*2*M_PI*f2*I); // alt
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X = z * cexp(-t *2*M_PI*f2*I); // neu
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dsp->F2sum += X - X0;
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xbit = cabs(dsp->F2sum) - cabs(dsp->F1sum);
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s = xbit / dsp->sps;
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}
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else if (dsp->opt_iq >= 2 && dsp->opt_iq < 6)
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{
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double xbit = 0.0;
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//float complex xi = cexp(+I*M_PI*dsp->h/dsp->sps);
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double f1 = -dsp->h*dsp->sr/(2*dsp->sps);
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double f2 = -f1;
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float complex X1 = 0;
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float complex X2 = 0;
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int n = dsp->sps;
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float sk = dsp->sps/2.4f;
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while (n > 0) {
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n--;
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if (n > sk && n < dsp->sps-sk)
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{
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t = -n / (double)dsp->sr;
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z = dsp->rot_iqbuf[(dsp->sample_in - n + dsp->N_IQBUF) % dsp->N_IQBUF]; // +1
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X1 += z*cexp(-t*2*M_PI*f1*I);
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X2 += z*cexp(-t*2*M_PI*f2*I);
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while (n > 0) {
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n--;
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if (n > sk && n < _sps-sk)
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{
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t = -n / (double)dsp->sr;
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z = dsp->rot_iqbuf[(_sample - n + dsp->N_IQBUF) % dsp->N_IQBUF];
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X1 += z*cexp(-t*2*M_PI*f1*I);
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X2 += z*cexp(-t*2*M_PI*f2*I);
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}
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}
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xbit = cabs(X2) - cabs(X1);
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s = xbit / _sps; //opt_iq==5
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}
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xbit = cabs(X2) - cabs(X1);
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s = xbit / dsp->sps;
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}
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else {
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s = s_fm; //opt_iq=1,6
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}
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}
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else {
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if (f32read_sample(dsp, &s) == EOF) return EOF;
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s_fm = s; //opt_iq==0
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}
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// FM-lowpass
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if (dsp->opt_lp & LP_FM) {
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dsp->lpFM_buf[_sample % dsp->lpFMtaps] = s_fm;
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if (m+1 == decFM) {
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s_fm = re_lowpass(dsp->lpFM_buf, _sample, dsp->lpFMtaps, dsp->ws_lpFM);
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if (dsp->opt_iq < 2 || dsp->opt_iq > 5) s = s_fm; //opt_iq==0,1,6
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}
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}
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// IQFM-lowpass II / separate IQ-FM lowpass
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if (dsp->opt_lp & LP_IQFM) { // opt_iq==5
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dsp->lpIQFM_buf[_sample % dsp->lpIQFMtaps] = s;
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if (m+1 == decFM) {
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s = re_lowpass(dsp->lpIQFM_buf, _sample, dsp->lpIQFMtaps, dsp->ws_lpIQFM);
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}
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}
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_sample += 1;
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@ -866,6 +861,8 @@ int f32buf_sample(dsp_t *dsp, int inv) {
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if (inv) s = -s;
|
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dsp->bufs[dsp->sample_in % dsp->M] = s;
|
||||
|
||||
dsp->fm_buffer[dsp->sample_in % dsp->M] = s_fm;
|
||||
|
||||
dsp->sample_out = dsp->sample_in - dsp->delay;
|
||||
|
||||
dsp->sample_in += 1;
|
||||
|
|
@ -880,20 +877,23 @@ static int read_bufbit(dsp_t *dsp, int symlen, char *bits, ui32_t mvp, int pos)
|
|||
ui32_t rcount = ceil(rbitgrenze);//+0.99; // dfm?
|
||||
|
||||
double sum = 0.0;
|
||||
double dc = 0.0;
|
||||
|
||||
if (dsp->opt_dc && (dsp->opt_iq < 2 || dsp->opt_iq > 5)) dc = dsp->dc;
|
||||
|
||||
// bei symlen=2 (Manchester) kein dc noetig: -dc+dc=0 ;
|
||||
// allerdings M10-header mit symlen=1
|
||||
|
||||
rbitgrenze += dsp->sps;
|
||||
do {
|
||||
sum += dsp->bufs[(rcount + mvp + dsp->M) % dsp->M] - dsp->dc;
|
||||
sum += dsp->bufs[(rcount + mvp + dsp->M) % dsp->M] - dc;
|
||||
rcount++;
|
||||
} while (rcount < rbitgrenze); // n < dsp->sps
|
||||
|
||||
if (symlen == 2) {
|
||||
rbitgrenze += dsp->sps;
|
||||
do {
|
||||
sum -= dsp->bufs[(rcount + mvp + dsp->M) % dsp->M] - dsp->dc;
|
||||
sum -= dsp->bufs[(rcount + mvp + dsp->M) % dsp->M] - dc;
|
||||
rcount++;
|
||||
} while (rcount < rbitgrenze); // n < dsp->sps
|
||||
}
|
||||
|
|
@ -919,8 +919,6 @@ static int headcmp(dsp_t *dsp, int opt_dc) {
|
|||
int len = dsp->hdrlen/dsp->symhd;
|
||||
int inv = dsp->mv < 0;
|
||||
|
||||
if (opt_dc == 0 || dsp->opt_iq > 1) dsp->dc = 0; // reset? e.g. 2nd pass
|
||||
|
||||
if (dsp->symhd != 1) step = 2;
|
||||
if (inv) sign=1;
|
||||
|
||||
|
|
@ -958,8 +956,8 @@ int read_softbit2p(dsp_t *dsp, hsbit_t *shb, int inv, int ofs, int pos, float l,
|
|||
|
||||
ui8_t bit = 0, bit1 = 0;
|
||||
|
||||
|
||||
if (dsp->opt_dc && dsp->opt_iq < 2) dc = dsp->dc;
|
||||
// whole frame, dsp->dDf correction before (!dsp->opt_iq can miss frame)
|
||||
if (dsp->opt_dc && (dsp->opt_iq < 2 || dsp->opt_iq > 5)) dc = dsp->dc;
|
||||
|
||||
if (pos == 0) {
|
||||
bg = 0;
|
||||
|
|
@ -1077,6 +1075,7 @@ int init_buffers_Lband(dsp_t *dsp) {
|
|||
float *m = NULL;
|
||||
|
||||
|
||||
// decimate
|
||||
if (dsp->opt_iq >= 5)
|
||||
{
|
||||
int IF_sr = IF_SAMPLE_RATE*Lscale; // designated IF sample rate
|
||||
|
|
@ -1117,40 +1116,42 @@ int init_buffers_Lband(dsp_t *dsp) {
|
|||
}
|
||||
if (dsp->opt_iq >= 5)
|
||||
{
|
||||
// look up table, exp-rotation
|
||||
int W = 2*8; // 16 Hz window
|
||||
int d = 1; // 1..W , groesster Teiler d <= W von sr_base
|
||||
int freq = (int)( dsp->xlt_fq * (double)dsp->sr_base + 0.5);
|
||||
int freq0 = freq; // init
|
||||
double f0 = freq0 / (double)dsp->sr_base; // init
|
||||
if (!dsp->opt_nolut)
|
||||
{
|
||||
// look up table, exp-rotation
|
||||
int W = 2*8; // 16 Hz window
|
||||
int d = 1; // 1..W , groesster Teiler d <= W von sr_base
|
||||
int freq = (int)( dsp->xlt_fq * (double)dsp->sr_base + 0.5);
|
||||
int freq0 = freq; // init
|
||||
double f0 = freq0 / (double)dsp->sr_base; // init
|
||||
|
||||
for (d = W; d > 0; d--) { // groesster Teiler d <= W von sr
|
||||
if (dsp->sr_base % d == 0) break;
|
||||
}
|
||||
if (d == 0) d = 1; // d >= 1 ?
|
||||
|
||||
for (k = 0; k < W/2; k++) {
|
||||
if ((freq+k) % d == 0) {
|
||||
freq0 = freq + k;
|
||||
break;
|
||||
for (d = W; d > 0; d--) { // groesster Teiler d <= W von sr
|
||||
if (dsp->sr_base % d == 0) break;
|
||||
}
|
||||
if ((freq-k) % d == 0) {
|
||||
freq0 = freq - k;
|
||||
break;
|
||||
if (d == 0) d = 1; // d >= 1 ?
|
||||
|
||||
for (k = 0; k < W/2; k++) {
|
||||
if ((freq+k) % d == 0) {
|
||||
freq0 = freq + k;
|
||||
break;
|
||||
}
|
||||
if ((freq-k) % d == 0) {
|
||||
freq0 = freq - k;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
dsp->lut_len = dsp->sr_base / d;
|
||||
f0 = freq0 / (double)dsp->sr_base;
|
||||
|
||||
dsp->ex = calloc(dsp->lut_len+1, sizeof(float complex));
|
||||
if (dsp->ex == NULL) return -1;
|
||||
for (n = 0; n < dsp->lut_len; n++) {
|
||||
t = f0*(double)n;
|
||||
dsp->ex[n] = cexp(t*2*M_PI*I);
|
||||
}
|
||||
}
|
||||
|
||||
dsp->lut_len = dsp->sr_base / d;
|
||||
f0 = freq0 / (double)dsp->sr_base;
|
||||
|
||||
dsp->ex = calloc(dsp->lut_len+1, sizeof(float complex));
|
||||
if (dsp->ex == NULL) return -1;
|
||||
for (n = 0; n < dsp->lut_len; n++) {
|
||||
t = f0*(double)n;
|
||||
dsp->ex[n] = cexp(t*2*M_PI*I);
|
||||
}
|
||||
|
||||
|
||||
dsp->decXbuffer = calloc( dsp->dectaps+1, sizeof(float complex));
|
||||
if (dsp->decXbuffer == NULL) return -1;
|
||||
|
||||
|
|
@ -1158,13 +1159,12 @@ int init_buffers_Lband(dsp_t *dsp) {
|
|||
if (dsp->decMbuf == NULL) return -1;
|
||||
}
|
||||
|
||||
// IQ lowpass
|
||||
if (dsp->opt_iq && (dsp->opt_lp & 1))
|
||||
// IF lowpass
|
||||
if (dsp->opt_iq && (dsp->opt_lp & LP_IQ))
|
||||
{
|
||||
float f_lp; // lowpass_bw
|
||||
int taps; // lowpass taps: 4*sr/transition_bw
|
||||
|
||||
// IF lowpass
|
||||
f_lp = 160e3/(float)dsp->sr/2.0; // default
|
||||
if (dsp->lpIQ_bw) f_lp = dsp->lpIQ_bw/(float)dsp->sr/2.0;
|
||||
taps = 4*dsp->sr/IF_TRANSITION_BW;
|
||||
|
|
@ -1185,14 +1185,11 @@ int init_buffers_Lband(dsp_t *dsp) {
|
|||
if (dsp->opt_dc) {
|
||||
dsp->locked = 0;
|
||||
dsp->ws_lpIQ = dsp->ws_lpIQ0;
|
||||
//taps = lowpass_update(1.5*dsp->lpIQ_fbw, dsp->lpIQtaps, dsp->ws_lpIQ); if (taps < 0) return -1;
|
||||
}
|
||||
// locked:
|
||||
//taps = lowpass_update(dsp->lpIQ_fbw, dsp->lpIQtaps, dsp->ws_lpIQ); if (taps < 0) return -1;
|
||||
}
|
||||
|
||||
// FM lowpass
|
||||
if (dsp->opt_lp & 2)
|
||||
if (dsp->opt_lp & LP_FM)
|
||||
{
|
||||
float f_lp; // lowpass_bw
|
||||
int taps; // lowpass taps: 4*sr/transition_bw
|
||||
|
|
@ -1200,8 +1197,9 @@ int init_buffers_Lband(dsp_t *dsp) {
|
|||
f_lp = 10e3/(float)dsp->sr; // default
|
||||
if (dsp->lpFM_bw > 0) f_lp = dsp->lpFM_bw/(float)dsp->sr;
|
||||
taps = 4*dsp->sr/FM_TRANSITION_BW;
|
||||
if (dsp->decFM > 1) {
|
||||
f_lp *= 2.0;
|
||||
if (dsp->decFM > 1)
|
||||
{
|
||||
f_lp *= 2; if (dsp->opt_iq >= 2 && dsp->opt_iq < 6) f_lp *= 2;
|
||||
taps = taps/2;
|
||||
}
|
||||
if (dsp->sr > 100e3) taps = taps/2;
|
||||
|
|
@ -1215,6 +1213,32 @@ int init_buffers_Lband(dsp_t *dsp) {
|
|||
if (dsp->lpFM_buf == NULL) return -1;
|
||||
}
|
||||
|
||||
// IQFM lowpass
|
||||
if (dsp->opt_lp & LP_IQFM) // opt_iq==5
|
||||
{
|
||||
float f_lp; // lowpass_bw
|
||||
int taps; // lowpass taps: 4*sr/transition_bw
|
||||
|
||||
f_lp = 10e3/(float)dsp->sr; // default
|
||||
//if (dsp->lpFM_bw > 0) f_lp = dsp->lpFM_bw/(float)dsp->sr;
|
||||
taps = 4*dsp->sr/FM_TRANSITION_BW;
|
||||
//if (dsp->decFM > 1)
|
||||
{
|
||||
f_lp *= 2.0*2;
|
||||
taps = taps/2;
|
||||
}
|
||||
if (dsp->sr > 100e3) taps = taps/2;
|
||||
if (dsp->sr > 200e3) taps = taps/2;
|
||||
taps = taps/2;
|
||||
taps = taps/2;
|
||||
if (taps%2==0) taps++;
|
||||
taps = lowpass_init(f_lp, taps, &dsp->ws_lpIQFM); if (taps < 0) return -1;
|
||||
|
||||
dsp->lpIQFMtaps = taps;
|
||||
dsp->lpIQFM_buf = calloc( dsp->lpIQFMtaps+3, sizeof(float complex));
|
||||
if (dsp->lpIQFM_buf == NULL) return -1;
|
||||
}
|
||||
|
||||
memset(&IQdc, 0, sizeof(IQdc));
|
||||
IQdc.maxlim = dsp->sr;
|
||||
IQdc.maxcnt = IQdc.maxlim/32; // 32,16,8,4,2,1
|
||||
|
|
@ -1357,23 +1381,32 @@ int free_buffers(dsp_t *dsp) {
|
|||
{
|
||||
if (dsp->decXbuffer) { free(dsp->decXbuffer); dsp->decXbuffer = NULL; }
|
||||
if (dsp->decMbuf) { free(dsp->decMbuf); dsp->decMbuf = NULL; }
|
||||
if (dsp->ex) { free(dsp->ex); dsp->ex = NULL; }
|
||||
if (!dsp->opt_nolut) {
|
||||
if (dsp->ex) { free(dsp->ex); dsp->ex = NULL; }
|
||||
}
|
||||
|
||||
if (ws_dec) { free(ws_dec); ws_dec = NULL; }
|
||||
}
|
||||
|
||||
// IF lowpass
|
||||
if (dsp->opt_iq && (dsp->opt_lp & 1))
|
||||
if (dsp->opt_iq && (dsp->opt_lp & LP_IQ))
|
||||
{
|
||||
if (dsp->ws_lpIQ0) { free(dsp->ws_lpIQ0); dsp->ws_lpIQ0 = NULL; }
|
||||
if (dsp->ws_lpIQ1) { free(dsp->ws_lpIQ1); dsp->ws_lpIQ1 = NULL; }
|
||||
if (dsp->lpIQ_buf) { free(dsp->lpIQ_buf); dsp->lpIQ_buf = NULL; }
|
||||
}
|
||||
if (dsp->opt_lp & 2)
|
||||
// FM lowpass
|
||||
if (dsp->opt_lp & LP_FM)
|
||||
{
|
||||
if (dsp->ws_lpFM) { free(dsp->ws_lpFM); dsp->ws_lpFM = NULL; }
|
||||
if (dsp->lpFM_buf) { free(dsp->lpFM_buf); dsp->lpFM_buf = NULL; }
|
||||
}
|
||||
// IQFM lowpass
|
||||
if (dsp->opt_lp & LP_IQFM)
|
||||
{
|
||||
if (dsp->ws_lpIQFM) { free(dsp->ws_lpIQFM); dsp->ws_lpIQFM = NULL; }
|
||||
if (dsp->lpIQFM_buf) { free(dsp->lpIQFM_buf); dsp->lpIQFM_buf = NULL; }
|
||||
}
|
||||
|
||||
if (dsp->fm_buffer) { free(dsp->fm_buffer); dsp->fm_buffer = NULL; }
|
||||
|
||||
|
|
@ -1413,14 +1446,12 @@ int find_header(dsp_t *dsp, float thres, int hdmax, int bitofs, int opt_dc) {
|
|||
if (dsp->locked) {
|
||||
dsp->locked = 0;
|
||||
dsp->ws_lpIQ = dsp->ws_lpIQ0;
|
||||
// alt: lowpass_update(1.5*dsp->lpIQ_fbw, dsp->lpIQtaps, dsp->ws_lpIQ);
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (dsp->locked == 0) {
|
||||
dsp->locked = 1;
|
||||
dsp->ws_lpIQ = dsp->ws_lpIQ1;
|
||||
// alt: lowpass_update(dsp->lpIQ_fbw, dsp->lpIQtaps, dsp->ws_lpIQ);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1971,6 +2002,7 @@ int main(int argc, char **argv) {
|
|||
int option_lp = 0;
|
||||
int option_dc = 0;
|
||||
int option_decFM = 0;
|
||||
int option_noLUT = 0;
|
||||
|
||||
int k;
|
||||
|
||||
|
|
@ -2054,21 +2086,27 @@ int main(int argc, char **argv) {
|
|||
if (fq > 0.5) fq = 0.5;
|
||||
dsp.xlt_fq = -fq; // S(t) -> S(t)*exp(-f*2pi*I*t)
|
||||
}
|
||||
else if (strcmp(*argv, "--lpIQ") == 0) { option_lp |= 1; } // IQ lowpass
|
||||
else if (strcmp(*argv, "--lpIQ") == 0) { option_lp |= LP_IQ; } // IQ lowpass
|
||||
else if (strcmp(*argv, "--lpbw") == 0) { // IQ lowpass BW / kHz
|
||||
double bw = 0.0;
|
||||
++argv;
|
||||
if (*argv) bw = atof(*argv);
|
||||
else return -1;
|
||||
if (bw > 100.0 && bw < 240.0) lpIQ_bw = bw*1e3;
|
||||
option_lp |= 1;
|
||||
option_lp |= LP_IQ;
|
||||
}
|
||||
else if (strcmp(*argv, "--lpFM") == 0) { option_lp |= 2; } // FM lowpass
|
||||
else if (strcmp(*argv, "--lpFM") == 0) { option_lp |= LP_FM; } // FM lowpass
|
||||
else if (strcmp(*argv, "--decFM") == 0) { // FM decimation
|
||||
option_lp |= 2;
|
||||
option_decFM = 4;
|
||||
}
|
||||
else if (strcmp(*argv, "--decFM2") == 0) { // FM decimation
|
||||
option_decFM = 2;
|
||||
}
|
||||
else if (strcmp(*argv, "--decFM1") == 0) { // FM decimation
|
||||
option_decFM = 1;
|
||||
}
|
||||
else if (strcmp(*argv, "--dc") == 0) { option_dc = 1; }
|
||||
else if (strcmp(*argv, "--noLUT") == 0) { option_noLUT = 1; }
|
||||
else if (strcmp(*argv, "--min") == 0) {
|
||||
option_min = 1;
|
||||
}
|
||||
|
|
@ -2153,17 +2191,19 @@ int main(int argc, char **argv) {
|
|||
dsp.br = (float)BAUD_RATE;
|
||||
|
||||
if (option_decFM) {
|
||||
if (option_iq == 5) option_lp |= LP_IQFM;
|
||||
else option_lp |= LP_FM;
|
||||
if (dsp.sr > 4*44000) dsp.opt_fmdec = 1;
|
||||
}
|
||||
dsp.sps = (float)dsp.sr/dsp.br;
|
||||
dsp.decFM = 1;
|
||||
if (dsp.opt_fmdec) {
|
||||
dsp.decFM = FM_DEC;
|
||||
dsp.decFM = option_decFM;
|
||||
while (dsp.sr % dsp.decFM > 0 && dsp.decFM > 1) dsp.decFM /= 2;
|
||||
dsp.sps /= (float)dsp.decFM;
|
||||
}
|
||||
|
||||
if (option_iq == 5 && option_dc) option_lp |= 2;
|
||||
if (option_iq == 5 && option_dc) option_lp |= LP_FM;
|
||||
|
||||
dsp.symlen = symlen;
|
||||
dsp.symhd = 1;
|
||||
|
|
@ -2191,6 +2231,12 @@ int main(int argc, char **argv) {
|
|||
fprintf(stderr, "sps corr: %.4f\n", dsp.sps);
|
||||
}
|
||||
|
||||
// LUT faster, however frequency correction after decimation
|
||||
// LUT recommonded if decM > 2
|
||||
//
|
||||
if (option_noLUT && option_iq >= 5) dsp.opt_nolut = 1; else dsp.opt_nolut = 0;
|
||||
|
||||
|
||||
k = init_buffers_Lband(&dsp);
|
||||
if ( k < 0 ) {
|
||||
fprintf(stderr, "error: init buffers\n");
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue