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Quadrature mirror filter

A quadrature mirror filter is a filter which splits an input signal into two bands which are subsampled by a factor of 2. The upper band has inverted frequencies, i.e. low frequencies are encoded as high frequencies and vice versa.

Frequencies in the transition band are encoded in the low passed and the high passed band with different amplitudes.



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Quadratic formula

... are also called the roots of the equation. The formula reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the ...

 
 
 
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