$2.$ Explain wavelet approach and related main wavelet equation. Draw wavelet model with the level of $\backslash (\backslash$mathrm$\{$cA$\}\_\{4\}\backslash )$ and $\backslash ($ c D$\_\{3\}\backslash )$ at the transmitter and related receiver block.

$3.($a$)$ For $\backslash (8\backslash$times $8\backslash )$ matrix input matrix with randomly chosen elements in the range of $[0,1].$

$($a$)$Apply lowpass filtering then down sampling output.

$($b$)$ Apply high pass filtering then down sampling