Studie změn impulsních odezev akustických prostředí pomocí dvou mikrofonů
Title Alternative:A Study of Changes of Impulse Responses in Acoustic Environments Using Two Microphones
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Date
2012
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Publisher
Technická Univerzita v Liberci
Abstract
Tato bakalářská práce se zabývá studiem impulzních odezev prostředí pomocí série pokusů. Dále se zabývá možným využitím impulzní odezvy k lokalizaci zdroje signálu v několika předem známých polohách. V této bakalářské práci jsou použity signály nahrávané na dvou mikrofonech. Takto nahrané signály jsou uloženy v předem vytvořené databázi a pro potřeby jednotlivých pokusů je z nich odhadnuta impulzní odezva jako Wienerův filtr. Účinnost tohoto filtru je následně testována pomocí několika pokusů. Lokalizace pozice zdroje signálu v předem známém umístění byla realizována pomocí porovnávání odhadnutého Wienerova filtru v jednotlivých možných pozicích zdroje a Wienerova filtru odhadnutého pro testovaný signál. Pro tuto metodu byla ověřena i robustnost řešení v případě drobných změn v okolí.
This graduate work investigates the impulse responses of the environment through a series of experiments. It also considers a possible use of impulse response to localize the signal sources in several positions known in advance. In this work, signals recorded using two microphones are used. The recorded signals are stored in a prepared database. For the purpose of individual experiments, the impulse response of these signals is estimated as a Wiener filter. The effectiveness of these filters is tested through several experiments. Localization of the signal source in some of the assumed positions that were measured in advance was made by comparing the estimated Wiener filter in each possible source positions and the estimated Wiener filter for the tested signal. The method was verified and its robustness in case of minor changes in the room was studied.
This graduate work investigates the impulse responses of the environment through a series of experiments. It also considers a possible use of impulse response to localize the signal sources in several positions known in advance. In this work, signals recorded using two microphones are used. The recorded signals are stored in a prepared database. For the purpose of individual experiments, the impulse response of these signals is estimated as a Wiener filter. The effectiveness of these filters is tested through several experiments. Localization of the signal source in some of the assumed positions that were measured in advance was made by comparing the estimated Wiener filter in each possible source positions and the estimated Wiener filter for the tested signal. The method was verified and its robustness in case of minor changes in the room was studied.
Description
katedra: ITE; přílohy: CD ROM; rozsah: 35 s. (37 181 znaků)
Subject(s)
impulzní odezva, wienerův filter, analýza odhadů mmse, lokalizace polohy, impulse responses, wiener filter, analysis of mmse estimates, location positions