Solution:

TIn subband coding the input signal is the first split to a number of nonoverlapping frequency bands by bandpass filters.

The output of each band pass filter is decimated or down-sampled by a factor My.

This can be achieved by retaining every Moth sample of the filter output \& discarding M-1 samples.

The output of the decimator is quantized using the techniques like PCM, DPCM, etc.

At the receiver \& inverse sequence of event takes place.

The subbands are demultiplexed \& decoded s then each subband signal is interpolated by inserting zeros to replace the samples discarded during decimation at the transmitter.

The output of the interpolator is applied to the band pass filter.

All bandpass filter outputs are summed together to reproduce the original signal.