pyACA.FeatureTimeZeroCrossingRate Namespace Reference

Functions
	FeatureTimeZeroCrossingRate (x, iBlockLength, iHopLength, f_s)
	computes the zero crossing rate of a time domain signal

Function Documentation

FeatureTimeZeroCrossingRate()

FeatureTimeZeroCrossingRate	(		x,
			iBlockLength,
			iHopLength,
			f_s )

computes the zero crossing rate of a time domain signal

Parameters

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

Returns

vzc: zero crossing rate

t: time stamp

Definition at line 16 of file FeatureTimeZeroCrossingRate.py.

def FeatureTimeZeroCrossingRate(x, iBlockLength, iHopLength, f_s):
 
    # create blocks
    xBlocks, t = pyACA.ToolBlockAudio(x, iBlockLength, iHopLength, f_s)
 
    # number of results
    iNumOfBlocks = xBlocks.shape[0]
 
    # allocate memory
    vzc = np.zeros(iNumOfBlocks)
 
    for n, block in enumerate(xBlocks):
        # calculate the zero crossing rate
        vzc[n] = 0.5 * np.mean(np.abs(np.diff(np.sign(block))))
 
    return vzc, t