I don't understand the meaning of scaling function when I used CWT/DWT. For me, I understand that the wavelet function (mother wavelet) is the function that we used to decompose our signal in subsignal corresponding to the frequency of the mother wavelet (for example db8). (Maybe DWT is different from wavelet decomposition ?)
For example, if I decompose my signal into 5 levels (with wavedec in MATLAB), I have : D1, D2, D3, D4, D5 and A5, with D the detail's signal and A the approximation's signal.
But here I never used the scaling function to make the decomposition of my signal.
Can you help me on how to understand the scaling function ?