Integer-to-integer complex extended lapped transform

Exponentially-modulated filter bank (EMFB) is an extension of odd-stacked cosine-modulated filter bank (CMFB) for subband processing of complex-valued signals. Paraunitary EMFB can be implemented using complex extended lapped transform (CELT) which is structurally critically sampled perfect reconstruction system. In this paper we introduce the necessary modifications to make the CELT algorithm suitable for invertible complex-valued integer-to-integer transform. The effect of alternative scaling approaches are compared in terms of subsignal integer range growth and maintaining pulse waveform in signal synthesis.