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
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.
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.