Please send the matlab code and graphics DUAL$-$TONE SIGNAL SYNTHESIS and ANALYSIS

You are instructed to write a code for dual$-$tone multi$-$frequency synthesizer and one other code for the decoding of the dual$-$tone signal. In touch tone dialing signals are generated by the keys and according to the frequencies in the below table. Keys are the inputs to your program.

Determine the specification of the filter

Design a band of filter, find the coefficients or impulse response

Implement your design in MATLAB