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POQuestions about Filters for Note Onset Detection?
 

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  1. POQuestions about Filters for Note Onset Detection?
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    <p>Forgive me if I may come as ignorant but I would like to ask some questions regarding using Filter Algorithms for Note Onset Detection.</p> <ol> <li><p>Is 'Detection Function' the same as using Filters on the audio signal? Or generally, what is the difference between Detection Function, Filtering (pre-processing the signal), and Peak-Picking?</p></li> <li><p>I've constantly heard about the Low-Pass (or High-Pass) filter, but I am confused. I read that it works on cancelling out certain frequencies that are below (or above) a certain threshold. However, I am using the Time-Domain for calculating Note Onsets (that is, using the change in signal amplitude/energy). So I am not sure on how I can apply low-pass filtering to the time-domain. Any other good filters for note-onset detection?</p></li> <li><p>What is the difference between, Spectral and Phase energy? (I have an idea that spectral refers to the spectogram or frequencies, but I do not know what Phase is)</p></li> <li><p>I am having difficulties with working with dynamic thresholding. Any suggestions for a good algorithm? For example, I have the following signal:</p></li> </ol> <p><img src="https://i.stack.imgur.com/vYa0v.jpg" alt="enter image description here"></p> <p>As shown in the image above, there are note onsets that I have missed. A brief description of my algorithm, I calculate and take note of the energy/amplitude changes that occur in the audio signal. Then I get the maximum 'energy change' and based on the sensitivity, I take a percentage of it and set it as the threshold. So this is where the problem of dealing with varying degrees of amplitude/energy comes in. If I set the sensitivity too low, I come up with 'ghost' onsets and if I set the sensitivity too high, I miss out on some onsets. Any suggestions to improve the algorithm (or suggest a new algorithm) that I am using?</p> <p>I am sure that it is difficult to have 100% accuracy but I need to have a better algorithm for note onset detection compared with what I have now. I would appreciate all the help I can get. Thank you very much!</p>
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