kopia lustrzana https://github.com/rs1729/RS
multi: frequency offset --dc
Zilog80
rodzic
8666e7424b
commit
ae39d22e90
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@ -15,6 +15,8 @@
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#include "demod_base.h"
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#define FM_GAIN (0.8)
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/* ------------------------------------------------------------------------------------ */
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@ -145,9 +147,12 @@ static int getCorrDFT(dsp_t *dsp) {
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float re_cx = 0.0;
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float xnorm = 1;
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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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dsp->mv = 0.0;
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dsp->dc = 0.0;
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@ -155,21 +160,38 @@ static int getCorrDFT(dsp_t *dsp) {
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if (dsp->sample_out < dsp->L) return -2;
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dsp->dc = get_bufmu(dsp, pos - dsp->sample_out); //oder unten: dft_dc = creal(X[0])/(K+L);
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// wenn richtige Stelle (Varianz pruefen, kein M10-carrier?), dann von bufs[] subtrahieren
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for (i = 0; i < dsp->K + dsp->L; i++) (dsp->DFT).xn[i] = dsp->bufs[(pos+dsp->M -(dsp->K + dsp->L-1) + i) % dsp->M];
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if (dsp->opt_iq > 1 && 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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rdft(&dsp->DFT, dsp->DFT.xn, dsp->DFT.X);
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// dft_dc = creal(dsp->DFT.X[0])/dsp->DFT.N;
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if (dsp->opt_dc) {
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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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dsp->DFT.X[0] -= dsp->DFT.N * dc ;//* 0.95;
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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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for (i = 0; i < dsp->DFT.N; i++) dsp->DFT.Z[i] = dsp->DFT.X[i]*dsp->DFT.Fm[i];
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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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@ -192,16 +214,23 @@ static int getCorrDFT(dsp_t *dsp) {
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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->bufs[(mpos-i + dsp->M) % dsp->M]*dsp->bufs[(mpos-i + dsp->M) % dsp->M];
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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_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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dsp->dDf = dsp->sr * dsp->dc / (2.0*FM_GAIN); // remaining freq offset
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return mp;
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}
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@ -266,7 +295,7 @@ float read_wav_header(pcm_t *pcm) {
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fprintf(stderr, "channels : %d\n", channels);
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if (pcm->sel_ch < 0 || pcm->sel_ch >= channels) pcm->sel_ch = 0; // default channel: 0
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//fprintf(stderr, "channel-In : %d\n", pcm->sel_ch+1);
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//fprintf(stderr, "channel-In : %d\n", pcm->sel_ch+1); // nur wenn nicht IQ
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if (bits_sample != 8 && bits_sample != 16 && bits_sample != 32) return -1;
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@ -306,28 +335,62 @@ static int f32read_sample(dsp_t *dsp, float *s) {
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return 0;
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}
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typedef struct {
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double sumIQx;
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double sumIQy;
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float avgIQx;
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float avgIQy;
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ui32_t cnt;
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ui32_t maxcnt;
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ui32_t maxlim;
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} iq_dc_t;
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static iq_dc_t IQdc;
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int iq_dc_init(pcm_t *pcm) {
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memset(&IQdc, 0, sizeof(IQdc));
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IQdc.maxlim = pcm->sr;
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IQdc.maxcnt = IQdc.maxlim/32; // 32,16,8,4,2,1
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if (pcm->decM > 1) {
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IQdc.maxlim *= pcm->decM;
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IQdc.maxcnt *= pcm->decM;
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}
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return 0;
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}
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static int f32read_csample(dsp_t *dsp, float complex *z) {
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if (dsp->bps == 32) {
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float x = 0, y = 0;
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float x, y;
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if (fread( &x, dsp->bps/8, 1, dsp->fp) != 1) return EOF;
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if (fread( &y, dsp->bps/8, 1, dsp->fp) != 1) return EOF;
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*z = x + I*y;
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if (dsp->bps == 32) { //float32
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float f[2];
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if (fread( f, dsp->bps/8, 2, dsp->fp) != 2) return EOF;
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x = f[0];
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y = f[1];
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}
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else if (dsp->bps == 16) { //int16
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short b[2];
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if (fread( b, dsp->bps/8, 2, dsp->fp) != 2) return EOF;
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x = b[0]/32768.0;
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y = b[1]/32768.0;
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}
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else { // dsp->bps == 8 //uint8
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ui8_t u[2];
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if (fread( u, dsp->bps/8, 2, dsp->fp) != 2) return EOF;
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x = (u[0]-128)/128.0;
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y = (u[1]-128)/128.0;
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}
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else { // dsp->bps == 8,16
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short a = 0, b = 0;
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if (fread( &a, dsp->bps/8, 1, dsp->fp) != 1) return EOF;
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if (fread( &b, dsp->bps/8, 1, dsp->fp) != 1) return EOF;
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*z = (x - IQdc.avgIQx) + I*(y - IQdc.avgIQy);
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*z = a + I*b;
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if (dsp->bps == 8) { *z -= 128 + I*128; }
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*z /= 128.0;
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if (dsp->bps == 16) { *z /= 256.0; }
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IQdc.sumIQx += x;
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IQdc.sumIQy += y;
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IQdc.cnt += 1;
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if (IQdc.cnt == IQdc.maxcnt) {
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IQdc.avgIQx = IQdc.sumIQx/(float)IQdc.maxcnt;
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IQdc.avgIQy = IQdc.sumIQy/(float)IQdc.maxcnt;
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IQdc.sumIQx = 0; IQdc.sumIQy = 0; IQdc.cnt = 0;
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if (IQdc.maxcnt < IQdc.maxlim) IQdc.maxcnt *= 2;
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}
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return 0;
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@ -392,6 +455,7 @@ static int f32read_cblock(dsp_t *dsp) { // blk_cond
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int n;
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int BL = dsp->decM * blk_sz;
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int len = BL;
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float x, y;
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if (bufeof) return 0;
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@ -402,17 +466,58 @@ static int f32read_cblock(dsp_t *dsp) { // blk_cond
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if (dsp->bps == 8) { //uint8
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ui8_t u[2*BL];
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len = fread( u, dsp->bps/8, 2*BL, dsp->fp) / 2;
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for (n = 0; n < len; n++) dsp->thd.blk[n] = (u[2*n]-128)/128.0 + I*(u[2*n+1]-128)/128.0;
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//for (n = 0; n < len; n++) dsp->thd.blk[n] = (u[2*n]-128)/128.0 + I*(u[2*n+1]-128)/128.0;
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// u8: 0..255, 128 -> 0V
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for (n = 0; n < len; n++) {
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x = (u[2*n ]-128)/128.0;
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y = (u[2*n+1]-128)/128.0;
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dsp->thd.blk[n] = (x-IQdc.avgIQx) + I*(y-IQdc.avgIQy);
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IQdc.sumIQx += x;
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IQdc.sumIQy += y;
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IQdc.cnt += 1;
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if (IQdc.cnt == IQdc.maxcnt) {
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IQdc.avgIQx = IQdc.sumIQx/(float)IQdc.maxcnt;
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IQdc.avgIQy = IQdc.sumIQy/(float)IQdc.maxcnt;
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IQdc.sumIQx = 0; IQdc.sumIQy = 0; IQdc.cnt = 0;
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if (IQdc.maxcnt < IQdc.maxlim) IQdc.maxcnt *= 2;
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}
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}
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}
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else if (dsp->bps == 16) { //int16
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short b[2*BL];
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len = fread( b, dsp->bps/8, 2*BL, dsp->fp) / 2;
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for (n = 0; n < len; n++) dsp->thd.blk[n] = b[2*n]/32768.0 + I*b[2*n+1]/32768.0;
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for (n = 0; n < len; n++) {
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x = b[2*n ]/32768.0;
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y = b[2*n+1]/32768.0;
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dsp->thd.blk[n] = (x-IQdc.avgIQx) + I*(y-IQdc.avgIQy);
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IQdc.sumIQx += x;
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IQdc.sumIQy += y;
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IQdc.cnt += 1;
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if (IQdc.cnt == IQdc.maxcnt) {
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IQdc.avgIQx = IQdc.sumIQx/(float)IQdc.maxcnt;
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IQdc.avgIQy = IQdc.sumIQy/(float)IQdc.maxcnt;
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IQdc.sumIQx = 0; IQdc.sumIQy = 0; IQdc.cnt = 0;
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if (IQdc.maxcnt < IQdc.maxlim) IQdc.maxcnt *= 2;
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}
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}
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}
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else { // dsp->bps == 32 //float32
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float f[2*BL];
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len = fread( f, dsp->bps/8, 2*BL, dsp->fp) / 2;
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for (n = 0; n < len; n++) dsp->thd.blk[n] = f[2*n] + I*f[2*n+1];
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for (n = 0; n < len; n++) {
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x = f[2*n];
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y = f[2*n+1];
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dsp->thd.blk[n] = (x-IQdc.avgIQx) + I*(y-IQdc.avgIQy);
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IQdc.sumIQx += x;
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IQdc.sumIQy += y;
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IQdc.cnt += 1;
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if (IQdc.cnt == IQdc.maxcnt) {
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IQdc.avgIQx = IQdc.sumIQx/(float)IQdc.maxcnt;
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IQdc.avgIQy = IQdc.sumIQy/(float)IQdc.maxcnt;
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IQdc.sumIQx = 0; IQdc.sumIQy = 0; IQdc.cnt = 0;
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if (IQdc.maxcnt < IQdc.maxlim) IQdc.maxcnt *= 2;
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}
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}
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}
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if (len < BL) bufeof = 1;
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@ -436,51 +541,6 @@ static int f32read_cblock(dsp_t *dsp) { // blk_cond
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}
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float get_bufvar(dsp_t *dsp, int ofs) {
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float mu = dsp->xs[(dsp->sample_out+dsp->M + ofs) % dsp->M]/dsp->Nvar;
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float var = dsp->qs[(dsp->sample_out+dsp->M + ofs) % dsp->M]/dsp->Nvar - mu*mu;
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return var;
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}
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float get_bufmu(dsp_t *dsp, int ofs) {
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float mu = dsp->xs[(dsp->sample_out+dsp->M + ofs) % dsp->M]/dsp->Nvar;
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return mu;
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}
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static int get_SNR(dsp_t *dsp) {
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if (dsp->opt_iq)
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// if(dsp->rs_typ == RS41)
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{
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if (dsp->sample_posnoise > 0) // rs41
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{
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if (dsp->sample_out >= dsp->sample_posframe && dsp->sample_out < dsp->sample_posframe+dsp->len_sq) {
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if (dsp->sample_out == dsp->sample_posframe) dsp->V_signal = 0.0;
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dsp->V_signal += cabs(dsp->rot_iqbuf[dsp->sample_out % dsp->N_IQBUF]);
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}
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if (dsp->sample_out == dsp->sample_posframe+dsp->len_sq) dsp->V_signal /= (double)dsp->len_sq;
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if (dsp->sample_out >= dsp->sample_posnoise && dsp->sample_out < dsp->sample_posnoise+dsp->len_sq) {
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if (dsp->sample_out == dsp->sample_posnoise) dsp->V_noise = 0.0;
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dsp->V_noise += cabs(dsp->rot_iqbuf[dsp->sample_out % dsp->N_IQBUF]);
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}
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if (dsp->sample_out == dsp->sample_posnoise+dsp->len_sq) {
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dsp->V_noise /= (double)dsp->len_sq;
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if (dsp->V_signal > 0 && dsp->V_noise > 0) {
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// iq-samples/V [-1..1]
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// dBw = 2*dBv, P=c*U*U
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// dBw = 2*10*log10(V/V0)
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dsp->SNRdB = 20.0 * log10(dsp->V_signal/dsp->V_noise+1e-20);
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}
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}
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}
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}
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else dsp->SNRdB = 0;
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return 0;
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}
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// decimate lowpass
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static float *ws_dec;
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@ -533,7 +593,6 @@ int decimate_free() {
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return 0;
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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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double complex w = 0;
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@ -543,12 +602,22 @@ static float complex lowpass(float complex buffer[], ui32_t sample, ui32_t taps,
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return (float complex)w;
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}
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static float re_lowpass(float buffer[], ui32_t sample, ui32_t taps, float *ws) {
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ui32_t n;
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double w = 0;
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for (n = 0; n < taps; n++) {
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w += buffer[(sample+n+1)%taps]*ws[taps-1-n];
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}
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return (float)w;
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}
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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 xneu, xalt;
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float complex z, w, z0;
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double gain = 0.8;
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double gain = FM_GAIN;
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double t = dsp->sample_in / (double)dsp->sr;
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@ -567,27 +636,30 @@ 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-lowpass
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if (dsp->opt_lp) {
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dsp->lpIQ_buf[dsp->sample_in % dsp->lpIQtaps] = z;
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z = lowpass(dsp->lpIQ_buf, dsp->sample_in, dsp->lpIQtaps, dsp->ws_lpIQ);
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}
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dsp->raw_iqbuf[dsp->sample_in % dsp->N_IQBUF] = z;
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//z *= cexp(-t*2*M_PI*dsp->df*I);
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z0 = dsp->rot_iqbuf[(dsp->sample_in-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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dsp->rot_iqbuf[dsp->sample_in % dsp->N_IQBUF] = z;
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/* //if (rs_type==rs41) get_SNR(dsp);
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// rs41, constant amplitude, avg/filter
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int n;
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double r = 0.0;
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for (n = 0; n < dsp->sps; n++) r += cabs(dsp->rot_iqbuf[(dsp->sample_in - n + dsp->N_IQBUF) % dsp->N_IQBUF]);
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r /= (float)n;
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*/
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// FM-lowpass
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if (dsp->opt_lp) {
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dsp->lpFM_buf[dsp->sample_in % dsp->lpFMtaps] = s;
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s = re_lowpass(dsp->lpFM_buf, dsp->sample_in, dsp->lpFMtaps, dsp->ws_lpFM);
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}
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dsp->fm_buffer[(dsp->sample_in - dsp->lpFMtaps/2 + dsp->M) % dsp->M] = s;
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if (dsp->opt_iq >= 2)
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{
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@ -649,7 +721,7 @@ int f32buf_sample(dsp_t *dsp, int inv) {
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}
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if (inv) s = -s;
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dsp->bufs[dsp->sample_in % dsp->M] = s - dsp->dc_ofs;
|
||||
dsp->bufs[dsp->sample_in % dsp->M] = s;
|
||||
|
||||
xneu = dsp->bufs[(dsp->sample_in ) % dsp->M];
|
||||
xalt = dsp->bufs[(dsp->sample_in+dsp->M - dsp->Nvar) % dsp->M];
|
||||
|
|
@ -674,17 +746,19 @@ static int read_bufbit(dsp_t *dsp, int symlen, char *bits, ui32_t mvp, int pos)
|
|||
|
||||
double sum = 0.0;
|
||||
|
||||
// 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];
|
||||
sum += dsp->bufs[(rcount + mvp + dsp->M) % dsp->M] - dsp->dc;
|
||||
rcount++;
|
||||
} while (rcount < rbitgrenze); // n < dsp->sps
|
||||
|
||||
if (symlen == 2) {
|
||||
rbitgrenze += dsp->sps;
|
||||
do {
|
||||
sum -= dsp->bufs[(rcount + mvp + dsp->M) % dsp->M];
|
||||
sum -= dsp->bufs[(rcount + mvp + dsp->M) % dsp->M] - dsp->dc;
|
||||
rcount++;
|
||||
} while (rcount < rbitgrenze); // n < dsp->sps
|
||||
}
|
||||
|
|
@ -710,6 +784,8 @@ 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;
|
||||
|
||||
|
|
@ -724,53 +800,9 @@ static int headcmp(dsp_t *dsp, int opt_dc) {
|
|||
len--;
|
||||
}
|
||||
|
||||
if (opt_dc && errs < 3) {
|
||||
dsp->dc_ofs += dsp->dc;
|
||||
}
|
||||
|
||||
return errs;
|
||||
}
|
||||
|
||||
int get_fqofs_rs41(dsp_t *dsp, ui32_t mvp, float *freq, float *snr) {
|
||||
int j;
|
||||
int buf_start;
|
||||
int presamples;
|
||||
|
||||
// if(dsp->rs_typ == RS41_PREAMBLE) ...
|
||||
if (dsp->opt_iq)
|
||||
{
|
||||
presamples = 256*dsp->sps;
|
||||
|
||||
if (presamples > dsp->DFT.N2) presamples = dsp->DFT.N2;
|
||||
|
||||
buf_start = mvp - dsp->hdrlen*dsp->sps - presamples;
|
||||
|
||||
while (buf_start < 0) buf_start += dsp->N_IQBUF;
|
||||
|
||||
for (j = 0; j < dsp->DFT.N2; j++) {
|
||||
dsp->DFT.Z[j] = dsp->DFT.win[j]*dsp->raw_iqbuf[(buf_start+j) % dsp->N_IQBUF];
|
||||
}
|
||||
while (j < dsp->DFT.N) dsp->DFT.Z[j++] = 0;
|
||||
|
||||
raw_dft(&dsp->DFT, dsp->DFT.Z);
|
||||
dsp->df = bin2freq(&dsp->DFT, max_bin(&dsp->DFT, dsp->DFT.Z));
|
||||
|
||||
// if |df|<eps, +-2400Hz dominant (rs41)
|
||||
if (fabs(dsp->df) > 1000.0) dsp->df = 0.0;
|
||||
|
||||
|
||||
dsp->sample_posframe = dsp->sample_in; // > sample_out //mvp - dsp->hdrlen*dsp->sps;
|
||||
dsp->sample_posnoise = mvp + dsp->sr*7/8.0; // rs41
|
||||
|
||||
|
||||
*freq = dsp->df;
|
||||
*snr = dsp->SNRdB;
|
||||
}
|
||||
else return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
|
||||
int read_slbit(dsp_t *dsp, int *bit, int inv, int ofs, int pos, float l, int spike) {
|
||||
|
|
@ -786,6 +818,10 @@ int read_slbit(dsp_t *dsp, int *bit, int inv, int ofs, int pos, float l, int spi
|
|||
|
||||
double bg = pos*dsp->symlen*dsp->sps;
|
||||
|
||||
double dc = 0.0;
|
||||
|
||||
if (dsp->opt_dc && dsp->opt_iq < 2) dc = dsp->dc;
|
||||
|
||||
if (pos == 0) {
|
||||
bg = 0;
|
||||
dsp->sc = 0;
|
||||
|
|
@ -805,6 +841,7 @@ int read_slbit(dsp_t *dsp, int *bit, int inv, int ofs, int pos, float l, int spi
|
|||
+dsp->bufs[(dsp->sample_out-dsp->buffered+1 + ofs + dsp->M) % dsp->M]);
|
||||
sample = avg + scale*(sample - avg); // spikes
|
||||
}
|
||||
sample -= dc;
|
||||
|
||||
if ( l < 0 || (mid-l < dsp->sc && dsp->sc < mid+l)) sum -= sample;
|
||||
|
||||
|
|
@ -824,6 +861,7 @@ int read_slbit(dsp_t *dsp, int *bit, int inv, int ofs, int pos, float l, int spi
|
|||
+dsp->bufs[(dsp->sample_out-dsp->buffered+1 + ofs + dsp->M) % dsp->M]);
|
||||
sample = avg + scale*(sample - avg); // spikes
|
||||
}
|
||||
sample -= dc;
|
||||
|
||||
if ( l < 0 || (mid-l < dsp->sc && dsp->sc < mid+l)) sum += sample;
|
||||
|
||||
|
|
@ -839,6 +877,8 @@ int read_slbit(dsp_t *dsp, int *bit, int inv, int ofs, int pos, float l, int spi
|
|||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
|
||||
#define IF_TRANSITION_BW (4e3) // 4kHz transition width
|
||||
#define FM_TRANSITION_BW (2e3) // 2kHz transition width
|
||||
|
||||
#define SQRT2 1.4142135624 // sqrt(2)
|
||||
// sigma = sqrt(log(2)) / (2*PI*BT):
|
||||
|
|
@ -875,8 +915,13 @@ int init_buffers(dsp_t *dsp) {
|
|||
int n, k;
|
||||
float *m = NULL;
|
||||
|
||||
|
||||
if (dsp->opt_iq == 5)
|
||||
{
|
||||
//
|
||||
// pcm_dec_init()
|
||||
//
|
||||
|
||||
// lookup table, exp-rotation
|
||||
int W = 2*8; // 16 Hz window
|
||||
int d = 1; // 1..W , groesster Teiler d <= W von sr_base
|
||||
|
|
@ -924,15 +969,38 @@ int init_buffers(dsp_t *dsp) {
|
|||
int taps; // lowpass taps: 4*sr/transition_bw
|
||||
|
||||
// IF lowpass
|
||||
taps = 4*dsp->sr/4e3; if (taps%2==0) taps++; // 4kHz transition
|
||||
f_lp = dsp->lpIQ_bw/(float)dsp->sr/2.0;
|
||||
taps = lowpass_init(f_lp, taps, &dsp->ws_lpIQ); if (taps < 0) return -1;
|
||||
f_lp = 24e3; // default
|
||||
if (dsp->lpIQ_bw) f_lp = dsp->lpIQ_bw/(float)dsp->sr/2.0;
|
||||
taps = 4*dsp->sr/IF_TRANSITION_BW; if (taps%2==0) taps++;
|
||||
taps = lowpass_init(1.5*f_lp, taps, &dsp->ws_lpIQ0); if (taps < 0) return -1;
|
||||
taps = lowpass_init(f_lp, taps, &dsp->ws_lpIQ1); if (taps < 0) return -1;
|
||||
|
||||
dsp->lpIQ_fbw = f_lp;
|
||||
dsp->lpIQtaps = taps;
|
||||
dsp->lpIQ_buf = calloc( dsp->lpIQtaps+3, sizeof(float complex));
|
||||
if (dsp->lpIQ_buf == NULL) return -1;
|
||||
|
||||
// dc-offset: if not centered, (aquisition) lowpass bw = lpIQ_bw + 4kHz
|
||||
dsp->ws_lpIQ = dsp->ws_lpIQ1;
|
||||
// dc-offset: if not centered, (acquisition) filter bw = lpIQ_bw + 4kHz
|
||||
// coarse acquisition:
|
||||
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
|
||||
f_lp = 10e3; // default
|
||||
if (dsp->lpFM_bw > 0) f_lp = dsp->lpFM_bw/(float)dsp->sr;
|
||||
taps = 4*dsp->sr/FM_TRANSITION_BW; if (taps%2==0) taps++;
|
||||
taps = lowpass_init(f_lp, taps, &dsp->ws_lpFM); if (taps < 0) return -1;
|
||||
|
||||
dsp->lpFMtaps = taps;
|
||||
dsp->lpFM_buf = calloc( dsp->lpFMtaps+3, sizeof(float complex));
|
||||
if (dsp->lpFM_buf == NULL) return -1;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -1035,12 +1103,11 @@ int init_buffers(dsp_t *dsp) {
|
|||
if (dsp->nch < 2) return -1;
|
||||
|
||||
dsp->N_IQBUF = dsp->DFT.N;
|
||||
dsp->raw_iqbuf = calloc(dsp->N_IQBUF+1, sizeof(float complex)); if (dsp->raw_iqbuf == NULL) return -1;
|
||||
dsp->rot_iqbuf = calloc(dsp->N_IQBUF+1, sizeof(float complex)); if (dsp->rot_iqbuf == NULL) return -1;
|
||||
|
||||
dsp->len_sq = dsp->sps*8;
|
||||
}
|
||||
|
||||
dsp->fm_buffer = (float *)calloc( M+1, sizeof(float)); if (dsp->fm_buffer == NULL) return -1; // dsp->bufs[]
|
||||
|
||||
|
||||
return K;
|
||||
}
|
||||
|
|
@ -1064,7 +1131,6 @@ int free_buffers(dsp_t *dsp) {
|
|||
|
||||
if (dsp->opt_iq)
|
||||
{
|
||||
if (dsp->raw_iqbuf) { free(dsp->raw_iqbuf); dsp->raw_iqbuf = NULL; }
|
||||
if (dsp->rot_iqbuf) { free(dsp->rot_iqbuf); dsp->rot_iqbuf = NULL; }
|
||||
}
|
||||
|
||||
|
|
@ -1075,15 +1141,22 @@ 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; }
|
||||
|
||||
// free(ws_dec) -> decimate_free()
|
||||
}
|
||||
|
||||
// IF lowpass
|
||||
if (dsp->opt_iq && dsp->opt_lp)
|
||||
{
|
||||
if (dsp->ws_lpIQ) { free(dsp->ws_lpIQ); dsp->ws_lpIQ = NULL; }
|
||||
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->ws_lpFM) { free(dsp->ws_lpFM); dsp->ws_lpFM = NULL; }
|
||||
if (dsp->lpFM_buf) { free(dsp->lpFM_buf); dsp->lpFM_buf = NULL; }
|
||||
}
|
||||
|
||||
if (dsp->fm_buffer) { free(dsp->fm_buffer); dsp->fm_buffer = NULL; }
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1120,6 +1193,29 @@ int find_header(dsp_t *dsp, float thres, int hdmax, int bitofs, int opt_dc) {
|
|||
|
||||
if (dsp->mv > thres || dsp->mv < -thres) {
|
||||
|
||||
if (dsp->opt_dc) { // Problem: FM-gain
|
||||
if (dsp->opt_iq < 2) dsp->Df += dsp->dDf*FM_GAIN / 2.0;
|
||||
else {
|
||||
double ofs = fabs(dsp->dDf); // (iq-decode controls FM-gain)
|
||||
if (ofs > 200.0)
|
||||
{
|
||||
dsp->Df += dsp->dDf*FM_GAIN / 1.2;
|
||||
}
|
||||
if (ofs > 1000.0) { //dsp->opt_lp
|
||||
if (dsp->locked) {
|
||||
dsp->locked = 0;
|
||||
dsp->ws_lpIQ = dsp->ws_lpIQ0;
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (dsp->locked == 0) {
|
||||
dsp->locked = 1;
|
||||
dsp->ws_lpIQ = dsp->ws_lpIQ1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (dsp->mv_pos > mvpos0) {
|
||||
|
||||
header_found = 0;
|
||||
|
|
|
|||
|
|
@ -70,8 +70,6 @@ typedef struct {
|
|||
int K;
|
||||
float *match;
|
||||
float *bufs;
|
||||
float dc_ofs;
|
||||
float dc;
|
||||
float mv;
|
||||
ui32_t mv_pos;
|
||||
//
|
||||
|
|
@ -85,7 +83,6 @@ typedef struct {
|
|||
// IQ-data
|
||||
int opt_iq;
|
||||
int N_IQBUF;
|
||||
float complex *raw_iqbuf;
|
||||
float complex *rot_iqbuf;
|
||||
float complex F1sum;
|
||||
float complex F2sum;
|
||||
|
|
@ -102,8 +99,12 @@ typedef struct {
|
|||
// DFT
|
||||
dft_t DFT;
|
||||
|
||||
double df;
|
||||
int len_sq;
|
||||
// dc offset
|
||||
int opt_dc;
|
||||
int locked;
|
||||
double dc;
|
||||
double Df;
|
||||
double dDf;
|
||||
|
||||
ui32_t sample_posframe;
|
||||
ui32_t sample_posnoise;
|
||||
|
|
@ -126,10 +127,20 @@ typedef struct {
|
|||
// IF: lowpass
|
||||
int opt_lp;
|
||||
int lpIQ_bw;
|
||||
float lpIQ_fbw;
|
||||
int lpIQtaps; // ui32_t
|
||||
float *ws_lpIQ0;
|
||||
float *ws_lpIQ1;
|
||||
float *ws_lpIQ;
|
||||
float complex *lpIQ_buf;
|
||||
|
||||
// FM: lowpass
|
||||
int lpFM_bw;
|
||||
int lpFMtaps; // ui32_t
|
||||
float *ws_lpFM;
|
||||
float *lpFM_buf;
|
||||
float *fm_buffer;
|
||||
|
||||
thd_t thd;
|
||||
} dsp_t;
|
||||
|
||||
|
|
@ -152,6 +163,7 @@ typedef struct {
|
|||
pcm_t pcm;
|
||||
thd_t thd;
|
||||
int option_jsn;
|
||||
int option_dc;
|
||||
} thargs_t;
|
||||
|
||||
|
||||
|
|
@ -160,10 +172,6 @@ float read_wav_header(pcm_t *);
|
|||
int f32buf_sample(dsp_t *, int);
|
||||
int read_slbit(dsp_t *, int*, int, int, int, float, int);
|
||||
|
||||
int get_fqofs_rs41(dsp_t *, ui32_t, float *, float *);
|
||||
float get_bufvar(dsp_t *, int);
|
||||
float get_bufmu(dsp_t *, int);
|
||||
|
||||
int init_buffers(dsp_t *);
|
||||
int free_buffers(dsp_t *);
|
||||
|
||||
|
|
@ -173,4 +181,5 @@ int find_header(dsp_t *, float, int, int, int);
|
|||
|
||||
int decimate_init(float f, int taps);
|
||||
int decimate_free(void);
|
||||
int iq_dc_init(pcm_t *);
|
||||
|
||||
|
|
|
|||
|
|
@ -878,9 +878,11 @@ void *thd_dfm09(void *targs) {
|
|||
dsp.hdrlen = strlen(dfm_rawheader);
|
||||
dsp.BT = 0.5; // bw/time (ISI) // 0.3..0.5
|
||||
dsp.h = 1.8; // 2.4 modulation index abzgl. BT
|
||||
dsp.lpIQ_bw = 12e3;
|
||||
dsp.opt_iq = option_iq;
|
||||
dsp.opt_lp = 1;
|
||||
dsp.lpIQ_bw = 12e3; // IF lowpass bandwidth
|
||||
dsp.lpFM_bw = 4e3; // FM audio lowpass
|
||||
dsp.opt_dc = tharg->option_dc;
|
||||
|
||||
if ( dsp.sps < 8 ) {
|
||||
fprintf(stderr, "note: sample rate low\n");
|
||||
|
|
@ -900,7 +902,7 @@ void *thd_dfm09(void *targs) {
|
|||
bitQ = 0;
|
||||
while ( 1 && bitQ != EOF )
|
||||
{
|
||||
header_found = find_header(&dsp, thres, 2, bitofs, 0);
|
||||
header_found = find_header(&dsp, thres, 2, bitofs, dsp.opt_dc);
|
||||
_mv = dsp.mv;
|
||||
|
||||
if (header_found == EOF) break;
|
||||
|
|
|
|||
|
|
@ -1028,9 +1028,11 @@ void *thd_lms6X(void *targs) { // pcm_t *pcm, double xlt_fq
|
|||
dsp.hdrlen = strlen(rawheader);
|
||||
dsp.BT = 1.2; // bw/time (ISI) // 1.0..2.0 // BT(lmsX) < BT(lms6) ? -> init_buffers()
|
||||
dsp.h = 0.9; // 0.95 modulation index
|
||||
dsp.lpIQ_bw = 8e3;
|
||||
dsp.opt_iq = option_iq;
|
||||
dsp.opt_lp = 1;
|
||||
dsp.lpIQ_bw = 8e3; // IF lowpass bandwidth
|
||||
dsp.lpFM_bw = 6e3; // FM audio lowpass
|
||||
dsp.opt_dc = tharg->option_dc;
|
||||
|
||||
if ( dsp.sps < 8 ) {
|
||||
fprintf(stderr, "note: sample rate low (%.1f sps)\n", dsp.sps);
|
||||
|
|
@ -1079,8 +1081,7 @@ void *thd_lms6X(void *targs) { // pcm_t *pcm, double xlt_fq
|
|||
bitQ = 0;
|
||||
while ( 1 && bitQ != EOF )
|
||||
{
|
||||
|
||||
header_found = find_header(&dsp, thres, 3, bitofs, option_dc);
|
||||
header_found = find_header(&dsp, thres, 3, bitofs, dsp.opt_dc);
|
||||
_mv = dsp.mv;
|
||||
|
||||
if (header_found == EOF) break;
|
||||
|
|
|
|||
|
|
@ -957,9 +957,11 @@ void *thd_m10(void *targs) { // pcm_t *pcm, double xlt_fq
|
|||
dsp.hdrlen = strlen(rawheader);
|
||||
dsp.BT = 1.8; // bw/time (ISI) // 1.0..2.0
|
||||
dsp.h = 0.9; // 1.2 modulation index
|
||||
dsp.lpIQ_bw = 24e3;
|
||||
dsp.opt_iq = option_iq;
|
||||
dsp.opt_lp = 1;
|
||||
dsp.lpIQ_bw = 24e3; // IF lowpass bandwidth
|
||||
dsp.lpFM_bw = 10e3; // FM audio lowpass
|
||||
dsp.opt_dc = tharg->option_dc;
|
||||
|
||||
if ( dsp.sps < 8 ) {
|
||||
fprintf(stderr, "note: sample rate low (%.1f sps)\n", dsp.sps);
|
||||
|
|
@ -980,7 +982,7 @@ void *thd_m10(void *targs) { // pcm_t *pcm, double xlt_fq
|
|||
bitQ = 0;
|
||||
while ( 1 && bitQ != EOF )
|
||||
{
|
||||
header_found = find_header(&dsp, thres, 2, bitofs, option_dc);
|
||||
header_found = find_header(&dsp, thres, 2, bitofs, dsp.opt_dc);
|
||||
_mv = dsp.mv;
|
||||
|
||||
if (header_found == EOF) break;
|
||||
|
|
|
|||
|
|
@ -1550,9 +1550,11 @@ void *thd_rs41(void *targs) { // pcm_t *pcm, double xlt_fq
|
|||
dsp.hdrlen = strlen(rs41_header);
|
||||
dsp.BT = 0.5; // bw/time (ISI) // 0.3..0.5
|
||||
dsp.h = 0.6; //0.7; // 0.7..0.8? modulation index abzgl. BT
|
||||
dsp.lpIQ_bw = 8e3;
|
||||
dsp.opt_iq = option_iq;
|
||||
dsp.opt_lp = 1;
|
||||
dsp.lpIQ_bw = 8e3; // IF lowpass bandwidth
|
||||
dsp.lpFM_bw = 6e3; // FM audio lowpass
|
||||
dsp.opt_dc = tharg->option_dc;
|
||||
|
||||
if ( dsp.sps < 8 ) {
|
||||
fprintf(stderr, "note: sample rate low (%.1f sps)\n", dsp.sps);
|
||||
|
|
@ -1572,7 +1574,7 @@ void *thd_rs41(void *targs) { // pcm_t *pcm, double xlt_fq
|
|||
bitQ = 0;
|
||||
while ( 1 && bitQ != EOF )
|
||||
{
|
||||
header_found = find_header(&dsp, thres, 3, bitofs, 0);
|
||||
header_found = find_header(&dsp, thres, 3, bitofs, dsp.opt_dc);
|
||||
_mv = dsp.mv;
|
||||
|
||||
if (header_found == EOF) break;
|
||||
|
|
|
|||
|
|
@ -67,6 +67,7 @@ static int pcm_dec_init(pcm_t *p) {
|
|||
p->sr = IF_sr; // sr_base/decM
|
||||
p->decM = decM;
|
||||
|
||||
iq_dc_init(p);
|
||||
|
||||
fprintf(stderr, "IF: %d\n", IF_sr);
|
||||
fprintf(stderr, "dec: %d\n", decM);
|
||||
|
|
@ -88,7 +89,8 @@ int main(int argc, char **argv) {
|
|||
double base_fqs[MAX_FQ];
|
||||
void *rstype[MAX_FQ];
|
||||
int option_pcmraw = 0,
|
||||
option_jsn = 0;
|
||||
option_jsn = 0,
|
||||
option_dc = 0;
|
||||
|
||||
#ifdef CYGWIN
|
||||
_setmode(fileno(stdin), _O_BINARY); // _fileno(stdin)
|
||||
|
|
@ -157,6 +159,9 @@ int main(int argc, char **argv) {
|
|||
else if (strcmp(*argv, "--json") == 0) {
|
||||
option_jsn = 1;
|
||||
}
|
||||
else if (strcmp(*argv, "--dc") == 0) {
|
||||
option_dc = 1;
|
||||
}
|
||||
else if (strcmp(*argv, "-") == 0) {
|
||||
int sample_rate = 0, bits_sample = 0, channels = 0;
|
||||
++argv;
|
||||
|
|
@ -220,6 +225,7 @@ int main(int argc, char **argv) {
|
|||
tharg[k].pcm = pcm;
|
||||
|
||||
tharg[k].option_jsn = option_jsn;
|
||||
tharg[k].option_dc = option_dc;
|
||||
|
||||
rbf1 |= tharg[k].thd.tn_bit;
|
||||
}
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue