Performing audio energy calculation from gui.

Hi all. What i want is after i select an audio file from gui, i will click a pushbutton called 'Calculate energy' to calculate the energy of the selected audio, then the energy value will be print out on the gui. I already have the energy formula, but i dont know where to put the formula in the gui. Do i have to paste it in the pushbutton callback? can someone please guide me with this. below is the formula to extract audio energy feature. thank you in advance.

 frameWidth = 441;                          %# 10 msec
  numSamples = length(y);                    %# Number of samples in y
  numFrames = floor(numSamples/frameWidth);  %# Number of full frames in y
  energy = zeros(1,numFrames);               %# Initialize energy
  startSample = zeros(1,numFrames);          %# Initialize start indices of frame
  endSample = zeros(1,numFrames);            %# Initialize end indices of frame

for frame = 1:numFrames                              %# Loop over frames
  startSample(frame) = (frame-1)*frameWidth+1;       %# Starting index of frame
  endSample(frame) = frame*frameWidth;               %# Ending index of frame
  frameIndex = startSample(frame):endSample(frame);  %# Indices of frame samples
  energy(frame) = sum(y(frameIndex).^2);             %# Calculate frame energy
end

Answer 1

[Geoff Hayes]

Sarah - it looks like your code for the energy calculation is in a script. Is that the case? If so, you could just convert it to a function that takes as input the audio data y and returns the energy output

 function [energy] = energyCalc(y)

 % etc. (code you have shown above)

The above assumes that y is the only needed input into this calculation. Then, in your GUI, you can call this function from within the 'Calculate Energy' pushbutton callback.

[sarah]

Mr Geoff, so i have to paste the function above into my pushbutton callback, is that right? and where exactly do i have to put the formula? please bare with me as i'm really clueless about this.

[Walter Roberson]

Yes you can paste it into the callback of the pushbutton that you use to active the calculation, after having defined any variables it needs.