Implements a shift register. Input is scalar, out is a
vector whose first coordinate is the most recent
input
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The input is FIR filtered, the subsampled by retaining only
one value out of two.
Output rate is half of the input's.
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Pure discrete delay..
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A symmetric dead zone centered on zero. Can be used in
wavelet denoising.
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Subsampled wavelet analysis. The input is processed by two
filters and the outputs are subsampled using the block on
the left.
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Shift invariant wavelet analysis. The input is simply
processed by two FIR filters which are dilated when the
scale increases.
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The details are suitably scaled and a finite difference is
performed on the LoRes signal. This is used to compute the
derivative of a signal using its wavelet coefficients.
8 scales are assumed to exist, e.g., Details has a width
of 8.
see pdf
document for mathematical background.
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Oversamples a signal by inserting a zero between every
successive pair of samples.
Ouput rate is double of the input's.
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The signal is fist oversampled by zero insertion (see left
block) and filtered.
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The delay block is used to synchronize a signal with another
one which is filtered by a non causal filter and at at
another scale.
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Input is set to zero if its absolute value is below a given
threshold. Can be used in wavelet denoising.
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Signal reconstruction from the analysis above. The two
inputs are "punched and filtered" and added to produce the
output.
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Shift invariant wavelet synthesis. The input is simply
processed by two dilated FIR filters and their sum is
devided by 2 two produce the output.
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Finite differente operator. It is a special implementattion
of a FIR filter
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