Calculate the deltas (derivatives) of a sequence of features using a w-point window with a simple linear slope.
deltas(x, w = 9)
Matrix of features. Every column represents one time frame. Each row is filtered separately.
Window width (usually odd).
This function mirrors the delta calculation performed in HTKs ‘feacalc’.
Returns a matrix of the delta features (one column per frame).
Sebastian Krey [email protected]
Daniel P. W. Ellis: http://www.ee.columbia.edu/~dpwe/resources/matlab/rastamat/
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