gcrcrec: Crazy Climbers Reconstruction by Penalization

In Rwave: Time-Frequency Analysis of 1-D Signals

Crazy Climbers Reconstruction by Penalization

Description

Reconstructs a real-valued signal from ridges found by crazy climbers on a Gabor transform.

Usage

gcrcrec(siginput, inputgt, beemap, nvoice, freqstep, scale, compr,
        bstep=5, ptile=0.01, epsilon=0, fast=TRUE, para=5, minnbnodes=3,
        hflag=FALSE, real=FALSE, plot=2)

Arguments

siginput	original signal.
inputgt	Gabor transform.
beemap	occupation measure, output of crc.
nvoice	number of frequencies.
freqstep	sampling step for frequency axis.
scale	size of windows.
compr	compression rate to be applied to the ridges.
bstep	size (in the time direction) of the steps for chaining.
ptile	threshold of ridge
epsilon	constant in front of the smoothness term in penalty function.
fast	if set to TRUE, uses trapezoidal rule to evaluate Q_2.
para	scale parameter for extrapolating the ridges.
minnbnodes	minimal number of points per ridge.
hflag	if set to FALSE, uses the identity as first term in the kernel. If not, uses Q_1 instead.
real	if set to TRUE, uses only real constraints.
plot	1 displays signal,components, and reconstruction one after another. 2 displays signal, components and reconstruction.

Details

When ptile is high, boundary effects may appear. para controls extrapolation of the ridge.

Value

Returns a structure containing the following elements:

rec	reconstructed signal.
ordered	image of the ridges (with different colors).
comp	2D array containing the signals reconstructed from ridges.

References

See discussions in the text of “Practical Time-Frequency Analysis”.

See Also

crc, cfamily, crcrec, scrcrec.

Rwave documentation built on Oct. 22, 2022, 1:05 a.m.