pyACA.ToolBlockAudio Namespace Reference

Functions
	ToolBlockAudio (x, iBlockLength, iHopLength, f_s)
	helper function: blocks an audio signal into overlapping blocks

Function Documentation

ToolBlockAudio()

ToolBlockAudio	(		x,
			iBlockLength,
			iHopLength,
			f_s )

helper function: blocks an audio signal into overlapping blocks

Parameters

x	array with floating point audio data (dimension samples x channels)
iBlockLength	internal block length
iHopLength	internal hop length
f_s	sample rate of audio data

Returns

x_b: 2D np.array containing the blocked data of shape (iNumOfBlocks x iBlockLength)

t: time stamp

Definition at line 15 of file ToolBlockAudio.py.

def ToolBlockAudio(x, iBlockLength, iHopLength, f_s):
 
    iNumBlocks = np.ceil(x.shape[0] / iHopLength).astype(int)
 
    # time stamp vector
    t = np.arange(0, iNumBlocks) * iHopLength / f_s + iBlockLength / (2*f_s)
 
    # pad with block length zeros just to make sure it runs for weird inputs, too
    afAudioPadded = np.concatenate((x, np.zeros([iBlockLength+iHopLength, ])), axis=0)
 
    return np.vstack([np.array(afAudioPadded[n*iHopLength:n*iHopLength+iBlockLength]) for n in range(iNumBlocks)]), t