Various studies performed so far have not provided unique answers to the acoustic quality evaluation of the sound control rooms, as no influence of specific features of the respective sound control ...room have been taken into account. In a process described in this paper, all the specific features that these rooms have are taken into consideration and sound is evaluated by means of reproduction through high quality professional equipment. Also, a listening area is a small, exactly given place for optimal listening for sound control engineer.The optimal sound control room must provide a complete and clear perception of reproduced sound with all specific features, and the room's spatial characteristics may not influence nor change the characteristics of the reproduced sound. Conjoint Analisys method is used to obtain estimation of the impact of the room objective acoustic quality parameters on the subjective assessment of the professional sound control room. Thereby, the use of modern statistical method (Conjoint Analysis - CA) shows dependence of one subjective parameter on more than one objective parameter. This principle determines more accurately real-life conditions, where all ratings are subject to complex dependence on more objective parameters.
Various studies performed so far have not provided unique answers to the acoustic quality evaluation of the sound control rooms, as no influence of specific features of the respective sound control ...room have been taken into account. In a process described in this paper, all the specific features that these rooms have are taken into consideration and sound is evaluated by means of reproduction through high quality professional equipment. Also, a listening area is a small, exactly given place for optimal listening for sound control engineer. The optimal sound control room must provide a complete and clear perception of reproduced sound with all specific features, and the room's spatial characteristics may not influence nor change the characteristics of the reproduced sound. Conjoint Analysis method is used to obtain estimation of the impact of the room objective acoustic quality parameters on the subjective assessment of the professional sound control room. Thereby, the use of modern statistical method (Conjoint Analysis--CA) shows dependence of one subjective parameter on more than one objective parameter. This principle determines more accurately real-life conditions, where all ratings are subject to complex dependence on more objective parameters.
Measuring process of acoustic quality parameters in sound control room in order to determine the best setup is described. Measurements of six sound control rooms impulse response have been made. The ...measurements are executed in accordance with the standard ISO3382. In all sound control rooms the same measurement method is used, but the measurement setups are changed. In the first scenario built-in monitor loudspeakers were used. In the second scenario, omnidirectional sound source was used. Omnidirectional measuring microphone and an artificial head were used as receivers. They were placed at the optimal listening position. Principal components analysis method is used to get the most accurate result from measured data obtained under different scenarios and measuring setups. Hence, the measuring conditions and setups which determine the value of subjective assessments of the sound control room are obtained. The results shall be used to calculate correlation between objective measurements and subjective assessments.
Objective parameters of the room acoustics quality are obtained from the impulse response, which is measured using the appropriate PC based acoustic measurement system with two types of loudspeakers. ...Such measurement gives the impulse response that is the result of measurement of the entire system, which consists of the room and electro acoustics equipment. In order to investigate the real influence of loudspeakers on the measurement results, the research was made in the same measuring conditions. Impulse responses were measured with the same measuring system. Measuring point was selected at the optimum listening position in the room, and all measurements were carried out in the same place. The loudspeakers were placed at the optimum and characteristic positions in the room, and rotated around their axes in order to determine the impact of their position and directivity characteristics on the measurement of objective parameters of room acoustic quality. Keywords: acoustic measurements; impulse response; objective acoustics quality; room acoustics; sound source Vrijednosti objektivnih parametara akusticke kvalitete prostora dobivaju se iz impulsnog odziva, koji se mjeri odgovarajucom opremom temeljenom na osobnom racunalu, s dvije vrste zvucnika. Takvo mjerenje daje impulsni odziv koji je rezultat mjerenja cijelog sustava, koji se sastoji od prostora i primijenjene elektoakusticke opreme. Napravljeno je istrazivanje koliki je stvarni utjecaj zvucnika na rezultate mjerenja. Impulsni odzivi mjereni su uvijek istom opremom, a mjerne tocke su odabrane tako da budu na optimalnom mjestu za slusanje, i sva mjerenja su izvedena u istom prostoru. Zvucnici su smjesteni na optimalnim i karakteristicnim mjestima u prostoriji, i rotirani su oko vertikalne osi u cilju utvrdivanja utjecaja njihove pozicije i usmjerne karatkeristike na rezultate mjerenja objektivnih parametara akusticke kvalitete prostora. Kljucne rijeci: akusticka mjerenja; akustika prostora; impulsni odziv; izvor zvuka; objektivna akusticka kvaliteta
Ovaj članak daje primjer izrade modela govornog trakta zasnovanog na akustičko-mehaničkim analogijama, za tri govornika, pomoću računalno zasnovanog sustava. Definiranje modela govornog trakta često ...se svodi na jednodimenzionalni akustički model, planarni valovodni model. Kad je napravljen akustičko-mehanički model, u analizu i sintezu uvode se računala i računalni programi. Pomoću njih se dobivaju modeli i izračuni koji sa zadovoljavajućom kvalitetom i preciznošću opisuju govorni trakt, pa takve modele možemo koristiti u praksi i primjenjivati na konkretne slučajeve. U članku su za dobivanje modela govornog trakta korištene tri različite programske podrške, svaka u svom segmentu izrade modela. Snimljena su tri govornika i napravljena je analiza glasa. Nakon toga je, opet koristeći računalo, izmodeliran dvodimenzionalni model govornog trakta, koji kao rezultat daje mehanički model s odre.enim brojem cjevčica. Na kraju je napravljena provjera tog modela sa programskom podrškom koja je napisana za tu svrhu, kako bi se utvrdilo da dobiveni model zaista predstavlja govorni trakt pojedinog govornika.
Objective parameters of the room acoustics quality are obtained from the impulse response, which is measured using the appropriate PC based acoustic measurement system with two types of loudspeakers. ...Such measurement gives the impulse response that is the result of measurement of the entire system, which consists of the room and electro acoustics equipment. In order to investigate the real influence of loudspeakers on the measurement results, the research was made in the same measuring conditions. Impulse responses were measured with the same measuring system. Measuring point was selected at the optimum listening position in the room, and all measurements were carried out in the same place. The loudspeakers were placed at the optimum and characteristic positions in the room, and rotated around their axes in order to determine the impact of their position and directivity characteristics on the measurement of objective parameters of room acoustic quality.Original Abstract: Vrijednosti objektivnih parametara akusticke kvalitete prostora dobivaju se iz impulsnog odziva, koji se mjeri odgovarajucom opremom temeljenom na osobnom racunalu, s dvije vrste zvucnika. Takvo mjerenje daje impulsni odziv koji je rezultat mjerenja cijelog sustava, koji se sastoji od prostora i primijenjene elektoakusticke opreme. Napravljeno je istrazivanje koliki je stvarni utjecaj zvucnika na rezultate mjerenja. Impulsni odzivi mjereni su uvijek istom opremom, a mjerne tocke su odabrane tako da budu na optimalnom mjestu za slusanje, i sva mjerenja su izvedena u istom prostoru. Zvucnici su smjesteni na optimalnim i karakteristicnim mjestima u prostoriji, i rotirani su oko vertikalne osi u cilju utvrdivanja utjecaja njihove pozicije i usmjerne karatkeristike na rezultate mjerenja objektivnih parametara akusticke kvalitete prostora.
Modelling voice tract using an acoustical-mechanical analogy is shown in this article. The process of modelling voice tract is often reduced to one-dimensional acoustical model, i.e. planar waveguide ...model. With this acoustical-mechanical model, computer programs are utilized to analyze and synthesize the voice tract. Hence, it is possible to calculate models which describe the voice tract with satisfactory quality and detail level and these models can be used in practice and applied to particular cases. In this article the process of producing a voice tract model is presented. The process includes the usage of three different computer programs, each of them dedicated to one segment of modelling. Recordings for three speakers were made and the analysis of voice parameters was performed. After the analysis is completed, a two-dimensional model of the voice tract was made, which resulted in a mechanical model consisting of specific number of tubes. Finally, the evaluation procedure for the model is done by applying a software developed specifically for this purpose, in order to determine whether the resulting model truly represents the voice tract of each speaker.
Prilikom projektiranja akustičkih filtara, velika je poteškoća proračun odgovarajuće frekvencijske karakteristike. Metoda raspodijeljenih parametara uz elektro-akustičke analogije omogućuje dobivanje ...realnih frekvencijskih karakteristika. Primjenom računala moguće je proračunati dimenzije i oblik akustičkog filtra odgovarajuće frekvencijske karakteristike i odgovarajuće razine gušenja.
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