QMF implementation using Xilinx SysGen (XSG)

The Quadrature Mirror Filter (QMF) basically is a parallel combination of of a High Pass Filter (HPF) and Low Pass Filter (LPF), which performs the action of frequency subdivision by splitting the signal spectrum into two spectra. Thus QMF finds wide applications in many signal processing tasks such as transmultiplexing, equalizing wireless communication channels; sub-band coding of speech and image signals, sub-band acoustic echo cancellation etc. Hence this paper is devoted to the effective utilization of XSG for hardware implementation of QMF. This assists the Xilinx IP Core generator to deliver the optimized results for the implemented device within short duration of time. The results obtained in the simulation of QMF using XSG and the communication system built using QMF at transmitter and receiver side indicate that the nearly `Perfect Reconstruction´ is possible without any effect of aliasing. The obtained Synthesis Report for implemented QMF indicates that the utilization of silicon die area and power dissipation, for Spartan 3E device, are sufficiently low. Also the comparison between the results of XSG and Simulink depicts that it is efficient to built QMF using XSG. The study reveals that QMF-DPCM provides much better approach towards the communication system. DPCM using QMF is introduced to pave the way for smooth transition from conventional 4 kHz band telephone systems to 7 kHz wide-band systems.