IMPLEMENTATION OF STEREO SOUND ENHANCEMENT ON FPGA
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INTRODUCTION
1.1 Background
In digital media, quality of stereo sound is more enjoyable than mono sound. Stereo sound is produced from more than one channel. There are several ways to mix two mono sound channels to produce stereo sound. One method of stereo sound enhancement is achieved by widening the stereo sound filed, so listener can enjoy clear and noiseless sound with great feeling. This stereo sound field can be widened with proper location of loudspeakers in the room to feel the stereo sound effect.

1.2 Introduction
This project focuses on the principle concepts of stereo sound enhancement. If we modify phase, intensity and frequency of the sound in appropriate way, we can produce significant amount of stereo sound effect. In this project, the stereo sound enhancement algorithm is implemented in Matlab to verify the quality of the sound enhanced by the algorithm. This algorithm can be implemented with different types digital FIR filters. In this project moving average filter and bandpass filter with different orders are simulated in Matlab. Based on the Matlab simulation, a band of pass filter of second order is designed and simulated in Verilog. A distributed arithmetic filter of 32nd order is implemented in verilog, after successful result of initial verilog design. This distributed arithmetic filter uses look up table design approach.



STEREO SOUND ENHANCEMENT TECHNIQUES
This chapter will discuss about stereo sound enhancement principles. It will discuss about
stereo sound enhancement algorithm, digital FIR filter and moving average filter. In this
chapter, digital FIR filter‟s Matlab simulations is presented with different filter orders
and cut off frequencies.

2.1 Stereo Sound Enhancement Techniques and Their Effects
There are several techniques by which stereo sound can be enhanced and the quality will
be improved according to the requirement. As the stereo sound has generally two
channels, we can achieve desired stereo sound effect by controlling few parameters
such as intensity of the signal, insertion a delay, phase shift, and frequency.