Added sweep signal generator. Partly functioning
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@ -24,10 +24,7 @@ typedef struct Siggen {
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SignalType signaltype;
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d fs; // Sampling frequency [Hz]
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d level_amp;
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void* private;
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char private_data[PRIVATE_SIZE];
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} Siggen;
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typedef struct {
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@ -35,6 +32,16 @@ typedef struct {
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d omg;
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} SinewaveSpecific;
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typedef struct {
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d fl;
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d fu;
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d Ts;
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d phase;
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d tau;
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bool pos;
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us flags;
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} SweepSpecific;
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typedef struct {
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d V1, V2, S;
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int phase;
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@ -51,7 +58,6 @@ Siggen* Siggen_create(SignalType type, const d fs,const d level_dB) {
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Siggen* siggen = a_malloc(sizeof(Siggen));
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siggen->signaltype = type;
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siggen->fs = fs;
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siggen->private = NULL;
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siggen->level_amp = level_amp(level_dB);
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feTRACE(15);
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@ -61,23 +67,24 @@ Siggen* Siggen_create(SignalType type, const d fs,const d level_dB) {
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Siggen* Siggen_Sinewave_create(const d fs, const d freq,const d level_dB) {
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fsTRACE(15);
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Siggen* sinesiggen = Siggen_create(SINEWAVE, fs, level_dB);
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sinesiggen->private = sinesiggen->private_data;
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SinewaveSpecific* sp = (SinewaveSpecific*) sinesiggen->private;
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Siggen* sine = Siggen_create(SINEWAVE, fs, level_dB);
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dbgassert(sizeof(SinewaveSpecific) <= sizeof(sine->private_data),
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"Allocated memory too small");
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SinewaveSpecific* sp = (SinewaveSpecific*) sine->private_data;
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sp->curtime = 0;
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sp->omg = 2*number_pi*freq;
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feTRACE(15);
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return sinesiggen;
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return sine;
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}
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Siggen* Siggen_Whitenoise_create(const d fs, const d level_dB) {
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fsTRACE(15);
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Siggen* whitenoise = Siggen_create(WHITENOISE, fs, level_dB);
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whitenoise->private = whitenoise->private_data;
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dbgassert(sizeof(WhitenoiseSpecific) <= sizeof(whitenoise->private_data), "Allocated memory too small");
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WhitenoiseSpecific* wn = whitenoise->private;
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dbgassert(sizeof(WhitenoiseSpecific) <= sizeof(whitenoise->private_data),
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"Allocated memory too small");
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WhitenoiseSpecific* wn = (WhitenoiseSpecific*) whitenoise->private_data;
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wn->phase = 0;
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wn->V1 = 0;
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wn->V2 = 0;
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@ -87,12 +94,50 @@ Siggen* Siggen_Whitenoise_create(const d fs, const d level_dB) {
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return whitenoise;
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}
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Siggen* Siggen_Sweep_create(const d fs,const d fl,const d fu,
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const d Ts, const us flags, const d level_dB) {
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fsTRACE(15);
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Siggen* sweep = Siggen_create(SWEEP, fs, level_dB);
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dbgassert(sizeof(SweepSpecific) <= sizeof(sweep->private_data),
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"Allocated memory too small");
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// Set pointer to inplace data storage
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SweepSpecific* sp = (SweepSpecific*) sweep->private_data;
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if(fl < 0 || fu < 0 || Ts <= 0) {
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return NULL;
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}
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sp->flags = flags;
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sp->fl = fl;
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sp->fu = fu;
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sp->Ts = Ts;
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sp->phase = 0;
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sp->pos = flags & SWEEP_FLAG_BACKWARD ? false: true;
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if(flags & SWEEP_FLAG_BACKWARD) {
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sp->tau = Ts;
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} else {
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sp->tau = 0;
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}
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/* sp->pos = false; */
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/* sp->tau = Ts/2; */
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feTRACE(15);
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return sweep;
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}
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void Siggen_free(Siggen* siggen) {
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fsTRACE(15);
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assertvalidptr(siggen);
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if(siggen->signaltype == SWEEP) {
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switch(siggen->signaltype) {
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case SWEEP:
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/* Sweep specific stuff here */
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break;
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case SINEWAVE:
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/* Sweep specific stuff here */
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break;
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}
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a_free(siggen);
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@ -114,6 +159,81 @@ static void Sinewave_genSignal(Siggen* siggen, SinewaveSpecific* sine, vd* sampl
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feTRACE(15);
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}
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static void Sweep_genSignal(Siggen* siggen, SweepSpecific* sweep,
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vd* samples) {
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fsTRACE(15);
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assertvalidptr(sweep);
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const d fl = sweep->fl;
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const d fu = sweep->fu;
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const d deltat = 1/siggen->fs;
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const d Ts = sweep->Ts;
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const d Thalf = Ts/2;
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dVARTRACE(20, deltat);
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// Load state
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d tau = sweep->tau;
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bool pos = sweep->pos;
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// Obtain flags and expand
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us flags = sweep->flags;
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bool forward_sweep = flags & SWEEP_FLAG_FORWARD;
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bool backward_sweep = flags & SWEEP_FLAG_BACKWARD;
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dbgassert(!(forward_sweep && backward_sweep), "Both forward and backward flag set");
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d k, Treverse;
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if(forward_sweep || backward_sweep) {
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k = (fu - fl)/Ts;
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Treverse = Ts;
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}
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else {
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k = (fu - fl)/Thalf;
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Treverse = Ts/2;
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}
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/* const d k = 0; */
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d phase = sweep->phase;
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d curfreq;
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for(us i =0; i< samples->n_rows; i++) {
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curfreq = fl + k*tau;
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phase = phase + 2*number_pi*curfreq*deltat;
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// Subtract some to avoid possible overflow. Don't know whether such a
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// thing really happens
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if(phase > 2*number_pi)
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phase = phase - 2*number_pi;
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if(pos) {
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tau = tau + deltat;
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if(tau >= Treverse) {
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if(forward_sweep) { tau = 0; }
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else if(backward_sweep) { dbgassert(false, "BUG"); }
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else { pos = false; }
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}
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} else {
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/* dbgassert(false, "cannot get here"); */
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tau = tau - deltat;
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if(tau <= 0) {
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if(backward_sweep) { tau = Treverse; }
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else if(forward_sweep) { dbgassert(false, "BUG"); }
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else { pos = true; }
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}
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}
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setvecval(samples, i, siggen->level_amp*d_sin(phase));
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}
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// Store state
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sweep->phase = phase;
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sweep->pos = pos;
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sweep->tau = tau;
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feTRACE(15);
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}
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static void Whitenoise_genSignal(Siggen* siggen, WhitenoiseSpecific* wn, vd* samples) {
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fsTRACE(15);
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d X;
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@ -155,19 +275,23 @@ void Siggen_genSignal(Siggen* siggen,vd* samples) {
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fsTRACE(15);
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assertvalidptr(siggen);
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assert_vx(samples);
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d fs = siggen->fs;
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switch(siggen->signaltype) {
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case SINEWAVE:
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Sinewave_genSignal(siggen, (SinewaveSpecific*) siggen->private,
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Sinewave_genSignal(siggen,
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(SinewaveSpecific*) siggen->private_data,
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samples);
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break;
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case WHITENOISE:
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Whitenoise_genSignal(siggen, (WhitenoiseSpecific*) siggen->private,
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Whitenoise_genSignal(siggen,
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(WhitenoiseSpecific*) siggen->private_data,
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samples);
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break;
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case SWEEP:
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Sweep_genSignal(siggen,
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(SweepSpecific*) siggen->private_data,
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samples);
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break;
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default:
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dbgassert(false, "Not implementend signal type");
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@ -37,8 +37,30 @@ Siggen* Siggen_Whitenoise_create(const d fs, const d level_dB);
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*/
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Siggen* Siggen_Pinknoise_create(const us fs,const d level_dB);
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/* Siggen* Siggen_ForwardSweep_create(const d fs,; */
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/* Siggen* Siggen_(const d fs,; */
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// Define this flag to repeat a forward sweep only, or backward only. If not
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// set, we do a continuous sweep
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#define SWEEP_FLAG_FORWARD 1
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#define SWEEP_FLAG_BACKWARD 2
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// Types of sweeps
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#define SWEEP_FLAG_LINEAR 4
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#define SWEEP_FLAG_EXPONENTIAL 8
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#define SWEEP_FLAG_HYPERBOLIC 16
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/**
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* Create a forward sweep
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*
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* @param[in] fs: Sampling frequency [Hz]
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* @param[in] fl: Lower frequency [Hz]
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* @param[in] fl: Upper frequency [Hz]
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* @param[in] Ts: Sweep period [s]
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* @param[in] sweep_flags: Sweep period [s]
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* @param[in] level: Relative level in [dB], should be between -inf and 0
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* @return Siggen* handle
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*/
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Siggen* Siggen_Sweep_create(const d fs,const d fl,const d fu,
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const d Ts, const us sweep_flags,
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const d level);
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/**
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* Obtain a new piece of signal
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@ -1,4 +1,4 @@
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#define TRACERPLUS 10
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#define TRACERPLUS (-5)
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#include "lasp_sosfilterbank.h"
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