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PObringing peaks down to be more in line with the overall average of the audio signal
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  1. PObringing peaks down to be more in line with the overall average of the audio signal
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    copied!<p>I have an audio signals In which sharp peaks are produced. Is there a way for me to bring the amplitude of only these specific peaks down to be more in line with the overall average of the audio signal (like in-between the green lines in the image)? <a href="http://dl.dropboxusercontent.com/u/6576402/questions/example_data_with_peak.txt" rel="nofollow noreferrer">Link to sample data used to create this</a></p> <p><img src="https://i.stack.imgur.com/NEy2m.png" alt="enter image description here"></p> <p>People have mentioned using median filtering but I only see information in regards to images.</p> <p>PS: I'm using octave 3.6.4</p> <p>I tried <a href="https://stackoverflow.com/questions/19154067/matlab-filter-electical-spikes-in-accelerometric-data">the code from this link</a></p> <pre><code>aa=csvread(strcat('/tmp/example_data_with_peak.txt'),5,0); %will skip the first 5 rows that are text and zeros figure(1); plot(aa) Af=aa; % Thresholds Tl = -0.3; To = 0.3; % initialisation peaks = find( Af &lt; Tl | Af &gt; To); counter = 0; while ~isempty(peaks) peaks = find( Af &lt; Tl | Af &gt; To); Af(peaks) = ( Af(peaks-1) + Af(peaks+1) ) / 2; counter=counter+1; end figure(2); plot(Af) </code></pre> <p><strong>But If I change Tl variable to -0.2 and To variable to 0.2 I get an error subscript indices must be either positive integers or logicals Any idea what I'm doing wrong?</strong></p>
 

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