ASCEE/lasp
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Added amplitude envelope to sweep signals, with associated methods
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This commit is contained in:
Thijs Hekman 2024-11-01 14:17:31 +01:00
parent a38eca47f3
commit 9caf5fe387
4 changed files with 111 additions and 39 deletions
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2
cpp_src/dsp/lasp_siggen.h
View File

@ -73,7 +73,7 @@ public:
* @brief Mute the signal. Passes through the DC offset. No lock is hold. If
* it just works one block later, than that is just the case.
*
* @param mute if tre
* @param mute if true
*/
void setMute(bool mute = true) { _muted = mute; _interruption_frame_count=0; }

131
cpp_src/dsp/lasp_siggen_impl.cpp
View File

@ -24,60 +24,84 @@ DEBUGTRACE_VARIABLES;
Noise::Noise(){DEBUGTRACE_ENTER}
vd Noise::genSignalUnscaled(us nframes) {
vd Noise::genSignalUnscaled(us nframes)
{
return arma::randn<vd>(nframes);
}
void Noise::resetImpl() {}
Sine::Sine(const d freq) : omg(2 * arma::datum::pi * freq) { DEBUGTRACE_ENTER; }
vd Sine::genSignalUnscaled(const us nframes) {
vd Sine::genSignalUnscaled(const us nframes)
{
/* DEBUGTRACE_ENTER; */
slock lck(_mtx);
const d pi = arma::datum::pi;
vd phase_vec =
arma::linspace(phase, phase + omg * (nframes - 1) / _fs, nframes);
phase += omg * nframes / _fs;
while (phase > 2 * arma::datum::pi) {
while (phase > 2 * arma::datum::pi)
{
phase -= 2 * pi;
}
return arma::sin(phase_vec);
}
vd Periodic::genSignalUnscaled(const us nframes) {
vd Periodic::genSignalUnscaled(const us nframes)
{
vd res(nframes);
slock lck(_mtx);
if (_signal.size() == 0) {
if (_signal.size() == 0)
{
throw rte("No signal defined while calling");
}
for (us i = 0; i < nframes; i++) {
res(i) = _signal[_cur_pos];
if (_signal.size() != A_.size())
{
std::cout << "Seq size: " << _signal.size() << ", A size: " << A_.size() << "\n";
throw rte("Sequence and amplitude envelopes have different lengths");
}
for (us i = 0; i < nframes; i++)
{
res(i) = A_[_cur_pos] * _signal[_cur_pos];
_cur_pos++;
_cur_pos %= _signal.size();
}
return res;
}
void Periodic::setA(const vd &A)
{
A_ = A;
}
Sweep::Sweep(const d fl, const d fu, const d Ts, const d Tq, const us flags)
: fl_(fl), fu_(fu), Ts(Ts), Tq(Tq), flags(flags) {
if (fl <= 0 || fu < fl || Ts <= 0) {
: fl_(fl), fu_(fu), Ts(Ts), Tq(Tq), flags(flags)
{
if (fl <= 0 || fu < fl || Ts <= 0)
{
throw rte("Invalid sweep parameters");
}
if ((flags & ForwardSweep) && (flags & BackwardSweep)) {
if ((flags & ForwardSweep) && (flags & BackwardSweep))
{
throw rte(
"Both forward and backward sweep flag set. Please only set either one "
"or none for a continuous sweep");
}
if ((flags & LinearSweep) && (flags & LogSweep)) {
if ((flags & LinearSweep) && (flags & LogSweep))
{
throw rte(
"Both logsweep and linear sweep flag set. Please only set either one.");
}
if (!((flags & LinearSweep) || (flags & LogSweep))) {
if (!((flags & LinearSweep) || (flags & LogSweep)))
{
throw rte("Either LinearSweep or LogSweep should be given as flag");
}
resetImpl();
}
void Sweep::resetImpl() {
void Sweep::resetImpl()
{
DEBUGTRACE_ENTER;
slock lck(_mtx);
@ -86,7 +110,7 @@ void Sweep::resetImpl() {
bool forward_sweep = flags & ForwardSweep;
bool backward_sweep = flags & BackwardSweep;
const d Dt = 1 / _fs; // Deltat
const d Dt = 1 / _fs; // Deltat
// Estimate N, the number of samples in the sweep part (non-quiescent part):
const us Ns = (us)(Ts * _fs);
@ -94,14 +118,18 @@ void Sweep::resetImpl() {
const us N = Ns + Nq;
_signal = vd(N, arma::fill::zeros);
fn_ = vd(N, arma::fill::zeros);
index = 0;
d fl, fu;
/* Swap fl and fu for a backward sweep */
if (backward_sweep) {
if (backward_sweep)
{
fu = fl_;
fl = fu_;
} else {
}
else
{
/* Case of continuous sweep, or forward sweep */
fl = fl_;
fu = fu_;
@ -110,8 +138,10 @@ void Sweep::resetImpl() {
d phase = 0;
/* Linear sweep */
if (flags & LinearSweep) {
if (forward_sweep || backward_sweep) {
if (flags & LinearSweep)
{
if (forward_sweep || backward_sweep)
{
/* Forward or backward sweep */
/* TRACE(15, "Forward or backward sweep"); */
us K = (us)(Dt * (fl * Ns + 0.5 * (Ns - 1) * (fu - fl)));
@ -120,12 +150,16 @@ void Sweep::resetImpl() {
/* iVARTRACE(15, K); */
/* dVARTRACE(15, eps); */
for (us n = 0; n < Ns; n++) {
for (us n = 0; n < Ns; n++)
{
_signal(n) = d_sin(phase);
d fn = fl + ((d)n) / Ns * (fu + eps - fl);
fn_(n) = fn;
phase += 2 * arma::datum::pi * Dt * fn;
}
} else {
}
else
{
/* Continous sweep */
/* TRACE(15, "continuous sweep"); */
@ -150,18 +184,24 @@ void Sweep::resetImpl() {
/* dVARTRACE(15, eps); */
d phase = 0;
for (us n = 0; n <= Ns; n++) {
for (us n = 0; n <= Ns; n++)
{
/* iVARTRACE(17, n); */
if (n < N) {
if (n < N)
{
_signal[n] = d_sin(phase);
}
d fn;
if (n <= Nf) {
if (n <= Nf)
{
fn = fl + ((d)n) / Nf * (fu - fl);
} else {
}
else
{
fn = fu - ((d)n - Nf) / Nb * (fu + eps - fl);
}
fn_(n) = fn;
/* dbgassert(fn >= 0, "BUG"); */
phase += 2 * number_pi * Dt * fn;
@ -169,9 +209,12 @@ void Sweep::resetImpl() {
/* This should be a very small number!! */
/* dVARTRACE(15, phase); */
}
} else if (flags & LogSweep) {
}
else if (flags & LogSweep)
{
DEBUGTRACE_PRINT("Log sweep");
if (forward_sweep || backward_sweep) {
if (forward_sweep || backward_sweep)
{
/* Forward or backward sweep */
DEBUGTRACE_PRINT("Forward or backward sweep");
d k1 = (fu / fl);
@ -180,7 +223,8 @@ void Sweep::resetImpl() {
/* Iterate k to the right solution */
d E;
for (us iter = 0; iter < 10; iter++) {
for (us iter = 0; iter < 10; iter++)
{
E = 1 + K / (Dt * fl) * (d_pow(k, 1.0 / Ns) - 1) - k;
d dEdk = K / (Dt * fl) * d_pow(k, 1.0 / Ns) / (Ns * k) - 1;
k -= E / dEdk;
@ -191,12 +235,16 @@ void Sweep::resetImpl() {
DEBUGTRACE_PRINT(k);
DEBUGTRACE_PRINT(E);
for (us n = 0; n < Ns; n++) {
for (us n = 0; n < Ns; n++)
{
_signal[n] = d_sin(phase);
d fn = fl * d_pow(k, ((d)n) / Ns);
fn_(n) = fn;
phase += 2 * number_pi * Dt * fn;
}
} else {
}
else
{
DEBUGTRACE_PRINT("Continuous sweep");
const us Nf = Ns / 2;
@ -212,7 +260,8 @@ void Sweep::resetImpl() {
/* Newton iterations to converge k to the value such that the sweep is
* continuous */
for (us iter = 0; iter < NITER_NEWTON; iter++) {
for (us iter = 0; iter < NITER_NEWTON; iter++)
{
E = (k - 1) / (d_pow(k, 1.0 / Nf) - 1) +
(k - 1) / (1 - d_pow(k, -1.0 / Nb)) - K / Dt / fl;
DEBUGTRACE_PRINT(E);
@ -236,29 +285,37 @@ void Sweep::resetImpl() {
DEBUGTRACE_PRINT(k);
DEBUGTRACE_PRINT(E);
for (us n = 0; n <= Ns; n++) {
for (us n = 0; n <= Ns; n++)
{
/* iVARTRACE(17, n); */
if (n < Ns) {
if (n < Ns)
{
_signal[n] = d_sin(phase);
}
d fn;
if (n <= Nf) {
if (n <= Nf)
{
fn = fl * d_pow(k, ((d)n) / Nf);
} else {
}
else
{
fn = fl * k * d_pow(1 / k, ((d)n - Nf) / Nb);
}
fn_(n) = fn;
/* dbgassert(fn >= 0, "BUG"); */
phase += 2 * number_pi * Dt * fn;
while (phase > 2 * number_pi) phase -= 2 * number_pi;
while (phase > 2 * number_pi)
phase -= 2 * number_pi;
/* dVARTRACE(17, phase); */
}
/* This should be a very small number!! */
DEBUGTRACE_PRINT(phase);
}
} // End of log sweep
else {
} // End of log sweep
else
{
// Either log or linear sweep had to be given as flags.
assert(false);
}

8
cpp_src/dsp/lasp_siggen_impl.h
View File

@ -58,6 +58,7 @@ class Sine : public Siggen {
* periodic as the frequency can be any floating point value.
*/
class Periodic: public Siggen {
protected:
vd _signal { 1, arma::fill::zeros};
us _cur_pos = 0;
@ -68,8 +69,12 @@ class Periodic: public Siggen {
* @return As stated above
*/
vd getSequence() const { return _signal; }
vd A_ { 1, arma::fill::ones};
void setA(const vd& A);
virtual vd genSignalUnscaled(const us nframes) override final;
~Periodic() = default;
};
@ -81,6 +86,7 @@ class Sweep : public Periodic {
d fl_, fu_, Ts, Tq;
us index;
us flags;
vd fn_ { 1, arma::fill::zeros};
void resetImpl() override;
@ -90,6 +96,8 @@ class Sweep : public Periodic {
static constexpr int LinearSweep = 1 << 2;
static constexpr int LogSweep = 1 << 3;
vd getfn() const { return fn_; }
/**
* Create a sweep signal
*

7
cpp_src/pybind11/lasp_siggen.cpp
View File

@ -43,11 +43,18 @@ void init_siggen(py::module &m) {
py::class_<Periodic, std::shared_ptr<Periodic>> periodic(m, "Periodic",
siggen);
periodic.def("setA",
[](Periodic &p, const dpyarray A) {
p.setA(NpyToCol<d, false>(A));
});
periodic.def("getSequence",
[](const Sweep &s) { return ColToNpy<d>(s.getSequence()); });
py::class_<Sweep, std::shared_ptr<Sweep>> sweep(m, "Sweep", periodic);
sweep.def(py::init<const d, const d, const d, const d, const us>());
sweep.def("getfn",
[](const Sweep &s) { return ColToNpy<d>(s.getfn()); });
sweep.def_readonly_static("ForwardSweep", &Sweep::ForwardSweep);
sweep.def_readonly_static("BackwardSweep", &Sweep::BackwardSweep);
sweep.def_readonly_static("LinearSweep", &Sweep::LinearSweep);