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Embedded system for digital audio processing

Mourtzanos Triantafyllos

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Summary

In digital sound,the most common format to store music without compress is the cd quality on 44.1Khz sample rate and 16bit depth.For many audiophiles,the cd quality can't offer the maximum listening experience that thelistener can get and they support the superiority of high-resolution audio files.So,a strong debate which started at the end of the 90's when the first Dvd Quality music files were released is still open to discuss where new arguments appear constantly from both sides. This thesis diploma aims to improve the standard cd-quality with the application of interpolation mathematical methods on the original .wav file,without resampling the rate so that can be applied in a Hardware implementation.Having studied the capabilities of the human ear and the role played by psychoacoustics during the audio experience,two methods of interpolation were designed and modeled,Linear and Cubic Spline. Once implemented and experimentally studied the behavior of two methods both visually with spectrogram and waveforms so and the audibility with musical samples selection with different characteristics,we evaluated the methods,we compared the differences for different sampling rates and discussed the positives and negatives that have to each case.The Cubic Spline which is the main interpolation method in this work,gave us interesting results in compare to the original file,while on the other hand the Linear method was almost always worse than the original. Then our method adjusted for possible implementation in Hardware,which was designed and evaluated.

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