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1answer
61 views

Proper meaning (and origin) of PCM (pulse code modulation)?

(copy from Proper meaning (and origin) of PCM (pulse code modulation)? - Stack Overflow): Apologies first, as StackOverflow is possibly not the right forum for this question; in that case please ...
0
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1answer
42 views

Is applying a gaussian kernel a fancy way of saying convolving with a gaussian mask?

When someone says apply gaussian kernel, is that the same thing as saying, convolve it with a gaussian mask?
0
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1answer
17 views

Is “early vision” chronological or process

This might sound silly, but I have a language barrier type of question, and I was hoping someone could clear up this misunderstanding: I've seen the term "early vision" several times in papers I've ...
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2answers
409 views

White noise vs. delta pulse and Ultraviolet catastrofe

Everybody explains that white noise has all frequencies equally strong. But, this immediately means that Ultraviolet catastrofe inevitably happens if power > 0 stays constant at any frequency and, ...
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1answer
506 views

Scalogram (and related nomenclatures) for DWT?

My understanding of the scalogram is that, for a particular row, the scores of the projection of the input signal with the wavelet at a particular displacement is shown. Across rows, the same thing ...
4
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1answer
153 views

What does double hat mean in Spectral theory?

I was confused about the double hat notation $\hat{\hat .}$ and my teacher and I thought it probably means an estimate of an estimate most of the time, but we could not be 100% sure of its meaning. ...
2
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1answer
91 views

What does orthogonality mean in the context of adjacent channels in a filter bank?

First off, what does orthogonality mean in the context of adjacent channels in a filter bank? Secondly, I am reviewing some code in which the dot product of the transfer functions of adjacent ...
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1answer
2k views

Terminology: spectrum, spectrogram, spectrograph, sonogram, etc

In term of proper or accepted naming conventions of DSP graphics or instrumentation output, what is the difference between the words spectrum, spectrogram, spectrograph, and similar terms, and what ...
4
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1answer
166 views

Is there a “first” Fourier transform?

Every time I've read "first Fourier transform", I've assumed it to be a misspelling of the fast Fourier transform. Recently though, I saw the term in both the title and keywords of an article from a ...
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2answers
2k views

What is the relation between the PSDs of filter input and output called? $R_Y = |H|^2R_X$

If a wide-sense stationary signal X is fed to an LTI filter with the transfer function H, the power spectral density (PSD) of the output Y can be expressed as: $R_Y(f) = |H(f)|^2R_X(f)$ where $R_X$ ...
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1answer
1k views

What's the difference between the Gabor and Morlet wavelets?

The Gabor wavelet is a kind of the Gaussian modulated sinusoidal wave (source)   Gabor wavelets are formed from two components, a complex sinusoidal carrier and a Gaussian envelope. ...