FPGA Implementation of a Modulated Complex Lapped Transform for Watermarking Systems

The modulated complex lapped transform (MCLT) is a 2times oversampled DFT filter bank. The MCLT has showed to be a good selection in audio compression and watermarking systems. It has been demonstrated that a length-M MCLT can be mapped to a length-2M fast Fourier transform plus M butterfly-like stages without data shuffling, therefore, the MCLT is appropriate for efficient hardware implementations. This paper presents an efficient implementation of the MCLT in a field programmable gate array (FPGA). Results are presented and discussed.