Abstract: A multirate digital ?lter is a variable ?lter that provides variations on di?erent parameters such as bandwidth, sampling rate and frequency. Filter banks are particularly useful for communication applications since the channel bandwidths and frequencies are easily and rapidly adjusted during their operation. This paper proposes an alias free two channel orthogonal filter bank by Parks McClellan algorithm. The synthesis filter responses of proposed filter bank can be selected as time reversed version of analysis filters. Finite impulse response filter is used to get stable and linear output at synthesis side.

Keywords: Analysis filters, Filter banks, Finite impulse response filter, Orthogonal filter bank, Parks McClellan algorithm, Synthesis filters.