Metode optimizacije algoritama za digitalnu obradu zvuka

scientific master's theses

• Title (english): Optimization Methods for Digital Audio Algorithms
• Author: Hrvoje Mlinarić
• Mentor: Mario Kovač (mentor)
• Committee member: Bojan Ivančević (član povjerenstva)
• Committee member: Mario Kovač (član povjerenstva)
• Committee member: Željko Hocenski (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Control and Computer Engineering); Zagreb
• Defense date and country: 2002-01-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing; Process Computing
• Universal decimal classification (UDC): 004 - Computer science and technology. Computing. Data processing

Abstract

Rad predlaže novi način prikaza realnog broja i izvođenje matematičkih operacija sa realnim brojevima u algoritmima za digitalnu obradu zvuka. Prikazani su temeljni principi na kojima se zasnivaju svi današnji algoritmi za obradu digitalnog zvuka. Da bi se dobio bolji uvid u principe rada audio algoritama proučen je čovjekov sustav za slušanje. Radi boljeg razumijevanja novopredloženog načina zapisa detaljno je proučena problematika prikaza realnog broja u računalu i rad sa brojevima u formatu pomičnog zareza. U radu se također opisuju osnovne metode kompresije i metode kompresije digitalnog audio signala. Pošto je novopredloženi format zapisa primijenjen na MPEG Layer III algoritmu za kompresiju digitalnog audio signala, dan je pregled MPEG Layer III norme. Sa primjenom transformacija na MPEG Layer III algoritmu dokazana je opravdanost uvođenja novopredloženog formata i dobiven je uvid u poboljšanja koja se dobivaju u odnosu na simulaciju rada sa brojevima u formatu pomičnog zareza.

Abstract (english)

This master thesis proposes a new way of representation and execution of mathematical operations with floating point numbers in digital audio processing algorithms. It includes an overview of base principles for all present digital audio processing algorithms. To get better understanding of audio algorithm principles it describes human audio perception system. Floating point number representation and arithmetic theory is analyzed prior to introduction and proposal of new numeric representation and their arithmetic. New representation was used in MPEG Layer III algorithm for digital audio compression. Based on that experiment use of new number representation was successfully tested and improvements compared to standard representation of floating point number have been shown.

• Keywords: Psihoakustična svojstva uha; digitalni audio; Nyquistov kriterij; kompresija podataka; DPCM; Huffmanovo kodiranje; ADPCM; MPEG audio norma; pomični zarez
• Keywords (english): Ear; psychoacoustic model; digital audio; Nyquist sampling theorem; data compression; DPCM; Huffman coding; ADPCM; MPEG audio standard; floating-point
• Language: croatian
• URN:NBN: urn:nbn:hr:168:260356
• Study programme: Title: Postgraduate master programe in computing; Study programme type: university; Study level: postgraduate; Academic / professional title: magistar inženjer računarstva (magistar inženjer računarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-04-23 11:30:17