Obrada zvučnog signala u akustički različitim prostorima

undergraduate thesis

• Title (english): Sound signal processing in acoustically different rooms
• Author: Fabijan Žunić
• Mentor: Siniša Fajt (mentor)
• Committee member: Siniša Fajt (predsjednik povjerenstva)
• Committee member: Ivan Đurek (član povjerenstva)
• Committee member: Miljenko Krhen (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2017-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Obrađene su osnove frekvencijske, dinamičke i vremenske obrade signala. Objašnjeni su temelji akustike prostora, te pojave koje prate širenje zvuka u prostoru: Refleksija, difrakcija, refrakcija, apsorpcija, odjek. Objašnjene su akustičke osobine prostora i objektivni akustični parametri: Vrijeme odjeka, vrijeme ranog opadanja, indeks prijenosa govora, te ostali parametri akustičke kvalitete kao što su: vrijeme dolaska, srednje vrijeme, parametri L i D. Mjereno je vrijeme odjeka u dvije različite prostorije na čemu je i temeljeno istraživanje ovog rada. Obrađena je identična snimka u programu AVID Pro Tools koja se sastoji od više kanala u obje prostorije. Analizirane su snimke i pojedini uzorci u referentnoj prostoriji. Nakon analize donesen je subjektivni zaključak o kvaliteti snimke, te je slijedila frekvencijska analiza odabranih uzoraka iz snimke. Donošenjem konačnog zaključka o kvaliteti snimke računalom je simuliran prostor pogodniji za obradu audio signala u programskoj podršci.

Abstract (english)

The basics of frequency, dynamic and time signal processing were elaborated. The basics of room acoustics and the visuals that accompany the spread of sound are explained: Reflexion, diffraction, refraction, absorption, echo. The acoustic characteristics of space and objective acoustic parameters are explained: Response Time, Early Fall Rate, Speech Transmission Index, and other acoustic quality parameters such as: arrival time, mean time, L and D. Response time is measured in two different rooms upon which this research is based on. An identical recording was processed in both rooms in digital audio workstation AVID Pro Tools. Individual samples and whole recordings were analyzed in reference room afterwards.
After the analysis, a subjective conclusion was made on the quality of the recording, followed by a frequency analysis of the selected samples from the recording. By adopting the ultimate conclusion on the quality of the recording, reference room for processing audio signals was simulated in program support.

• Keywords: Obrada audio signala; akustika prostora; simulacija prostora; AVID Pro Tools; Audacity; EASE; EASERA
• Keywords (english): Audio processing; room acoustics; room simulation; AVID Pro Tools; Audacity; EASE; EASERA
• Language: croatian
• URN:NBN: urn:nbn:hr:168:904668
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-03-14 02:28:50