Filtering frequencies from .m4a data

I'm trying to analyze a sound file (.m4a) to get the amplitudes over time and make a graph. I found some code online that works great (below). However, I would like to additionally filter out all sounds that are not in a targeted frequency range. E.g...
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2017-12-03 23:12 (1) Answers

vDSP image phase correlation in Swift

For a project I'm working on I need to do phase correlation between several images. I have read on other questions that vDSP could be used for that purpose, more specifically vDSP_conv but I can't seem to find a way to use it to calculate the phase b...
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2017-10-22 20:10 (0) Answers