Akustička karakterizacija uređaja na osnovi ocjene parametara zvučne slike

doctoral thesis

• Title (english): Acoustical characterization of devices based on sound quality evaluation
• Author: Marko Horvat
• Mentor: Hrvoje Domitrović (mentor)
• Committee member: Bojan Ivančević (predsjednik povjerenstva)
• Committee member: Tino Bucak (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2010-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Cilj provedenog istraživanja jest definirati i prikazati metode akustičke karakterizacije uređaja na osnovi ocjene objektivnih i subjektivnih parametara zvučne slike. Istraživanje je provedeno za tri tipa ručnog električnog alata sa stajališta prosječnog krajnjeg korisnika.
Definiran je pojam kvalitete zvuka, objašnjeni su razlozi provedbe i ciljevi akustičke karakterizacije te je prikazan uobičajeni pristup ocjeni kvalitete zvuka sa stajališta proizvođača uređaja.
Predložen je skup objektivnih parametara za opis zvučne slike uređaja u pojedinim radnim fazama. U obzir su uzeti i novodefinirani i postojeći objektivni parametri. Naglasak je stavljen na definiranje parametara za opis zvučne slike uređaja pri zaustavljanju.
Predložen je skup subjektivnih parametara za ocjenu zvučne slike te njihova stroga podjela u grupe opisa zvuka, doživljaja zvuka i doživljaja svojstava uređaja. Definiran je postupak uzimanja uzoraka zvuka stvarnih uređaja, njihove pripreme za reprodukciju pri subjektivnim ispitivanjima te provedbe subjektivnih ispitivanja. Izrađena je aplikacija za sintezu uzoraka zvuka pojedinih tipova uređaja te su pomoću nje provedena subjektivna ispitivanja.
Analizom rezultata subjektivnih ispitivanja utvrđeni su relevantni subjektivni parametri za opis zvučne slike pojedinih tipova uređaja i njihova međusobna povezanost. Ispitan je utjecaj iskustva ispitanika na formiranje mišljenja o svojstvima uređaja i njegovog zvuka. Načinjena je usporedba stvarnih i sintetiziranih uzoraka zvuka radi utvrđivanja trendova kojima valja posvetiti pažnju pri dizajnu zvuka uređaja. Procijenjen je utjecaj doživljaja zvuka na ocjenu svojstava uređaja.
Analizom korelacije objektivnih i subjektivnih parametara utvrđeni su skupovi objektivnih parametara relevantnih za opis pojedinih subjektivnih parametara doživljaja zvuka ili svojstava uređaja. Na osnovi pronađenih objektivnih parametara izrađeni su linearni regresijski modeli pojedinih subjektivnih parametara. Ispitana je reprezentativnost dobivenih modela.

Abstract (english)

The goal of this research is to define and present the methods of acoustical characterization of devices based on sound quality evaluation using both objective and subjective parameters. The research has been conducted for three types of hand-held power tools from the viewpoint of the end user.
The definition of sound quality has been given in the context of this research, the reasons and goals of acoustical characterization have been explained and the common approach to sound quality evaluation from the viewpoint of the manufacturer has been presented.
A set of objective parameters has been proposed for use in sound quality evaluation for different phases of operation. Both newly defined and existing parameters have been considered. The emphasis was made on defining the parameters used for describing the properties of the sound the devices emit during stopping.
A set of subjective parameters has been proposed to be used for sound quality evaluation. A strict distinction of these parameters has been proposed as sound descriptors, sound perception descriptors and device perception descriptors. The procedure for collecting the sound samples of real devices has been defined and the preparation procedure for raw samples has been explained. The procedure of conducting subjective listening tests has been established. A computer application has been made for synthesizing sounds of different types of devices and another set of subjective tests have been conducted using this application.
The relevance of certain subjective parameters for sound quality evaluation and the correlation between them has been determined. The examination has been made of the influence the listeners’ experience in working with the devices has on forming of their judgments about the properties of the devices and their sound. The comparison has been made between real and synthesized sound samples in order to ascertain the trends that have to be accounted for in sound design of these types of devices. An estimate has been made on the influence the perception of sound has on perception of the properties of a device.
The analysis of correlation between objective and subjective parameters has established sets of objective parameters to be used for describing certain sound perception descriptors and device perception descriptors. Linear regression models of these descriptors have been made and examined based on the sets of objective parameters found in correlation analysis.

• Keywords: akustička karakterizacija; ocjena zvučne slike; uređaj; ručni električni alat; prosječni korisnik; objektivni parametri; subjektivni parametri; iskustvo; linearna korelacija; linearni regresijski modeli
• Keywords (english): acoustical characterization; sound quality evaluation; device; hand-held power tools; average user; objective parameters; subjective parameters; experience; linear correlation; linear regression models
• Language: croatian
• URN:NBN: urn:nbn:hr:168:895966
• Promotion: 2010
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• Extent: ii, 259 str. : graf. prikazi
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-20 09:39:33