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Chris Han | April 24, 2017

Frequency Decomposition Part 2 - Constant Q

Frequency Decomposition Part 2 - Constant Q

Chris Han on 24 Apr 2017

This weeks blog post continues to look at frequency decomposition techniques available in Geoteric. We previously looked at the Constant Bandwidth technique, we now look at another Standard Frequency Decomposition technique, the Constant Q.

Link to Part 1 - Constant Bandwidth


Part 2 - Constant Q

The Constant Q method utilises bandpass filters to carry out decomposition with properties similar to a Continuous Wavelet Transform (CWT).  The main benefit of this technique is that due to variable filter lengths and bandwidths there is a reduced filter length at higher frequencies, therefore these bands provide an increased vertical resolution whilst the result can still be processed quickly over large volumes.

Constant Q Frequency Decomposition Colour Blending in GeoTeric

There are two Constant Q options available: Uniform Constant Q and Exponential Constant Q. One may be beneficial over the other to achieve a good frequency decomposition colour blend depending on the frequency spectrum of the data.

Constant Q Frequency Decomposition in GeoTeric


Colour Blending, Frequency Decomposition & RGB Blending, Spectral Decomposition, Blog