Design & Simulation of 128x Interpolator Filter

TL;DR

This paper details the design and simulation of a 128x interpolator filter for audio applications, demonstrating its effectiveness and noise rejection capabilities using MATLAB and XILINX ISE.

Contribution

It introduces a novel interpolator structure utilizing half-band filters and Comb/Sinc filters, optimized for high-frequency audio applications.

Findings

Achieved maximum operating frequency of 34.584 MHz

Successfully meets design specifications

Exhibits good noise rejection capabilities

Abstract

This paper presents the design consideration and simulation of interpolator of OSR 128. The proposed structure uses the half band filers & Comb/Sinc filter. Experimental result shows that proposed interpolator achieves the design specification, and also has good noise rejection capabilities. The interpolator accepts the input at 44.1 kHz for applications like CD & DVD audio. The interpolation filter can be applied to the delta sigma DAC. The related work is done with the MATLAB & XILINX ISE simulators. The maximum operating frequency is achieved as 34.584 MHz.