Simultaneous Measurement of Spatial Room Impulse Responses from Multiple Sound Sources Using a Continuously Moving Microphone

2018 ◽  
Author(s):  
Nara Hahn ◽  
Sascha Spors
Keyword(s):  
Simultaneous Measurement ◽  
Impulse Responses ◽  
Sound Sources

A virtual orchestra to qualify the acoustics of historical opera houses

2020 ◽  
Vol 27 (3) ◽  
pp. 235-252 ◽  
Author(s):  
Dario D’Orazio ◽  
Giulia Fratoni ◽  
Anna Rovigatti ◽  
Massimo Garai
Keyword(s):  
18Th Century ◽  
Public Spaces ◽  
Early Age ◽  
Impulse Responses ◽  
Sound Sources ◽  
Social Division ◽  
Subjective Preference ◽  
Acoustic Comfort ◽  
Opera Houses

Italian Historical Opera Houses are private or public spaces built around a cavea, with tiers of boxes on the surrounding walls. At the early age – from 16th to 18th century – boxes were private properties of the richest class, typically the financial responsible of the whole building. The stalls hosted the middle class, that gradually increased its social position and for this reason the wooden seats were progressively replaced by chairs. The gallery was reserved to lower classes. Does this social division correspond to a different acoustic comfort? The present work tries to answer this question using subjective preference models provided by scholars. With this aim, the room criteria defined by different authors and in distinct times are lined up with the ISO 3382 standards and analysed depending on the acoustic peculiarities of an Italian Historical Opera House selected as case study. Calibrated impulse responses were handled through the numerical simulations of a whole orchestra of virtual sound sources in the pit.

scholarly journals The Role of Reverberation and Magnitude Spectra of Direct Parts in Contralateral and Ipsilateral Ear Signals on Perceived Externalization

2019 ◽  
Vol 9 (3) ◽  
pp. 460 ◽  
Author(s):  
Song Li ◽  
Roman Schlieper ◽  
Jürgen Peissig
Keyword(s):  
Speech Signal ◽  
Impulse Responses ◽  
Sound Sources ◽  
Reverberant Environments ◽  
Contralateral Ear ◽  
Listening Experiment ◽  
Binaural Sound

Several studies show that the reverberation and spectral details in direct sounds are two essential cues for perceived externalization of virtual sound sources in reverberant environments. The present study investigated the role of these two cues in contralateral and ipsilateral ear signals on perceived externalization of headphone-reproduced binaural sound images at different azimuth angles. For this purpose, seven pairs of non-individual binaural room impulse responses (BRIRs) were measured at azimuth angles of −90°, −60°, −30°, 0°, 30°, 60°, and 90° in a listening room. The magnitude spectra of direct parts were smoothed, and the reverberation was removed, either in left or right ear BRIRs. Such modified BRIRs were convolved with a speech signal, and the resulting binaural sounds were presented over headphones. Subjects were asked to assess the degree of perceived externalization for the presented stimuli. The result of the subjective listening experiment revealed that the magnitude spectra of direct parts in ipsilateral ear signals and the reverberation in contralateral ear signals are important for perceived externalization of virtual lateral sound sources.

scholarly journals Localizing nearby sound sources in a classroom: Binaural room impulse responses

2005 ◽  
Vol 117 (5) ◽  
pp. 3100-3115 ◽  
Author(s):  
Barbara G. Shinn-Cunningham ◽  
Norbert Kopco ◽  
Tara J. Martin
Keyword(s):  
Impulse Responses ◽  
Sound Sources

scholarly journals Synthesis of Room Impulse Responses for Variable Source Characteristics

10.14311/1444 ◽  
2011 ◽  
Vol 51 (5) ◽  
Author(s):  
M. Kunkemoeller ◽  
P. Dietrich ◽  
M. Pollow
Keyword(s):  
Radiation Pattern ◽  
Musical Instrument ◽  
Lecture Hall ◽  
Acoustic Measurements ◽  
Impulse Responses ◽  
Acoustic Source ◽  
Characteristic Radiation ◽  
Sound Sources ◽  
Variable Source ◽  
Source Characteristics

Every acoustic source, e.g. a speaker, a musical instrument or a loudspeaker, generally has a frequency dependent characteristic radiation pattern, which is preeminent at higher frequencies. Room acoustic measurements nowadays only account for omnidirectional source characteristics. This motivates a measurement method that is capable of obtaining room impulse responses for these specific radiation patterns by using a superposition approach of several measurements with technically well-defined sound sources. We propose a method based on measurements with a 12-channel independentlydriven dodecahedron loudspeaker array rotated by an automatically controlled turntable.Radiation patterns can be efficiently described with the use of spherical harmonics representation. We propose a method that uses this representation for the spherical loudspeaker array used for the measurements and the target radiation pattern to be used for the synthesis.We show validating results for a deterministic test sound source inside in a small lecture hall.

Reproduction of Phantom Sources Improves with Separation of Direct and Reflected Sounds

2015 ◽  
Vol 40 (4) ◽  
pp. 575-584
Author(s):  
Piotr Kleczkowski ◽  
Aleksandra Król ◽  
Paweł Małecki
Keyword(s):  
Sound Source ◽  
Sound Field ◽  
Angular Separation ◽  
Impulse Responses ◽  
Sound Sources ◽  
Perceptual Effect ◽  
Multichannel Systems ◽  
Virtual Acoustics

AbstractIn virtual acoustics or artificial reverberation, impulse responses can be split so that direct and reflected components of the sound field are reproduced via separate loudspeakers. The authors had investigated the perceptual effect of angular separation of those components in commonly used 5.0 and 7.0 multichannel systems, with one and three sound sources respectively (Kleczkowski et al., 2015, J. Audio Eng. Soc. 63, 428-443). In that work, each of the front channels of the 7.0 system was fed with only one sound source. In this work a similar experiment is reported, but with phantom sound sources between the front loud- speakers. The perceptual advantage of separation was found to be more consistent than in the condition of discrete sound sources. The results were analysed both for pooled listeners and in three groups, according to experience. The advantage of separation was the highest in the group of experienced listeners.

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