ToolBlockAudio

blocks audio signal into overlapping blocks
>
> @param x: audio signal (dimension length x 1)
> @param iBlockLength: target block size
> @param iHopLength: target hopsize
> @param f_s: sample rate
>
> @retval x_b (dimension iNumOfBlocks x iBlockLength)
> @retval t time stamps for blocks
 ======================================================================

0001 %blocks audio signal into overlapping blocks
0002 %>
0003 %> @param x: audio signal (dimension length x 1)
0004 %> @param iBlockLength: target block size
0005 %> @param iHopLength: target hopsize
0006 %> @param f_s: sample rate
0007 %>
0008 %> @retval x_b (dimension iNumOfBlocks x iBlockLength)
0009 %> @retval t time stamps for blocks
0010 % ======================================================================
0011 function [x_b, t] = ToolBlockAudio(x, iBlockLength, iHopLength, f_s)
0012     
0013     iNumBlocks = ceil(size(x, 1)/iHopLength );
0014     
0015     % time stamp vector
0016     t = (0:(iNumBlocks-1)) * iHopLength / f_s + iBlockLength/(2*f_s);
0017     
0018     % pad with zeros just to make sure it runs for weird inputs, too
0019     xPadded = [x; zeros(iBlockLength+iHopLength, 1)];
0020  
0021     x_b = zeros(iNumBlocks, iBlockLength);
0022     
0023     for n = 1:iNumBlocks
0024         x_b(n, :) = xPadded((n-1)*iHopLength+1:(n-1)*iHopLength+iBlockLength);
0025     end
0026 end