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You searched for +publisher:"Delft University of Technology" +contributor:("De Vries, D."). Showing records 1 – 3 of 3 total matches.

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Delft University of Technology

1. Van der Wiele, O.M. Use of a rotating source for acoustic measurements:.

Degree: 2000, Delft University of Technology

At the Laboratory of Acoustic Imaging and Sound Control, much research is done in the field of room acoustics. The impulse response is widely regarded as the most meaningful characteristic in room acoustics. For a certain combination of source and receiver position, the impulse response is the sound pressure at the receiver position as a function of time generated by an acoustic pulse emitted at the source position. A major requirement for the source is omnidirectionality: the source must radiate acoustic energy equally in all directions. In 1980, Beentjes [2] has developed an acoustic source consisting of a 32-face source sphere and a separate bass loudspeaker. This source radiates omnidirectionally from 60 to 2800 Hz. Taking in account that the range of interest is from 50 to 5000Hz, a successor is desirable. In the present research, the utility of a rotating loudspeaker for room response measurements is investigated. In theory, reproducing a linear frequency sweep with a rotating source results in decomposition of the directivity of the source. The contributions of the mono-pole, dipole and higher order pole terms to the directivity pattern of the source are separated. A monopole is omnidirectional, thus the response to an omnidirectional source can be calculated. Simulations confirm the theory, the directivity is decomposed. Use of a ‘normal’ linear frequency sweep results in a required measuring time of at least 100 minutes, which is not acceptable. Use of parallel linear frequency sweeps reduces the required time to a couple of minutes. A disadvantage of parallel sweeps is that the position of the turntable at the beginning must be the same as the position at the ending of the measurement. This requires a very constant angular velocity of the turntable. Doppler effects have a large influence on the impulse response. Doppler effects result in a complex directivity, resulting in many higher order pole contributions to the impulse response. In addition, the power spectrum gets the shape of a sinc-function, with a smaller central peak for a higher angular velocity. Experiments confirm the results of the simulation. The impulse response of a rotating loudspeaker under anechoic conditions shows many peaks at the positions corresponding to monopole, dipole and higher order poles. The S/N ratio in room measurements is 65 dB at best and 40 dB at worst, which is a very promising result. Using better equipment, the S/N ratio can become even higher. The rotating source in combination with a frequency sweep is a promising tool for impulse response measurements in rooms. The idea of creating a monopole with one loudspeaker is elegant and the achieved S/N ratio is very good. A negative point is the high demand on the measuring equipment (a very constantly rotating turntable is necessary). A problem that has not been investigated in this research, is the extension to 3D. A rotating speaker has only a monopole directivity component in a horizontal plane perpendicular to the rotation axis. Radiation in the direction of… Advisors/Committee Members: De Vries, D..

Subjects/Keywords: acoustic; pulse; response; rotation; room; active; reflection; rotating

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Van der Wiele, O. M. (2000). Use of a rotating source for acoustic measurements:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b1369bb3-e5e2-4a2e-9cbf-20f1ec37cf65

Chicago Manual of Style (16th Edition):

Van der Wiele, O M. “Use of a rotating source for acoustic measurements:.” 2000. Masters Thesis, Delft University of Technology. Accessed April 06, 2020. http://resolver.tudelft.nl/uuid:b1369bb3-e5e2-4a2e-9cbf-20f1ec37cf65.

MLA Handbook (7th Edition):

Van der Wiele, O M. “Use of a rotating source for acoustic measurements:.” 2000. Web. 06 Apr 2020.

Vancouver:

Van der Wiele OM. Use of a rotating source for acoustic measurements:. [Internet] [Masters thesis]. Delft University of Technology; 2000. [cited 2020 Apr 06]. Available from: http://resolver.tudelft.nl/uuid:b1369bb3-e5e2-4a2e-9cbf-20f1ec37cf65.

Council of Science Editors:

Van der Wiele OM. Use of a rotating source for acoustic measurements:. [Masters Thesis]. Delft University of Technology; 2000. Available from: http://resolver.tudelft.nl/uuid:b1369bb3-e5e2-4a2e-9cbf-20f1ec37cf65


Delft University of Technology

2. Van Dorp Schuitman, J. Auditory modelling for assessing room acoustics.

Degree: 2011, Delft University of Technology

The acoustics of a concert hall, or any other room, are generally assessed by measuring room impulse responses for one or multiple source and receiver location(s). From these responses, objective parameters can be determined that should be related to various perceptual attributes of room acoustics. A set of these parameters is collected in ISO standard 3382. However, this method of assessing room acoustical quality has some major shortcomings. First of all, it is known that the perception of the acoustics of a room is dependent on the type of source signal. This is not taken into account when only impulse responses are considered. Furthermore, because of the type of test signals used to perform such a measurement, measurements are mostly carried out in empty rooms, while the acoustics can change drastically when a room is fully occupied with people. Finally, there is evidence in the literature of cases in which the parameters sometimes do not correlate well with perception. For example, it has been found that some parameters can fluctuate severely over small measurement intervals, whereas the perceptual attributes for which these parameters should be predictors remain constant. Apparently, some important properties of the human auditory system are not taken into account sufficiently. In this thesis, a new method is proposed. The method consists of the processing of arbitrary binaural audio recordings using a binaural, non-linear auditory model. These recordings (or simulations) should be performed with a dummy head. This model simulates the most important stages of the auditory system, such as the response of the inner ear, basilar membrane and hair cells, neural adaptation and binaural interaction. Using a peak detection algorithm, the output signals of the model are split into two separate streams: one related to the source (direct sound) and one related to the environment (reverberant sound). Together with the calculation of the amount of fluctuation in the Interaural Time Difference (ITD) over time, parameters can be determined that are related to the perceptual attributes reverberance, clarity, apparent source width and listener envelopment. The new method has been validated through four listening tests. In these tests, subjects had to rate the four perceptual attributes that were discussed above, for various room/stimulus combinations. Two different source stimuli were used: male speech and cello music. Two listening tests included virtual rooms, which were simulated binaurally using a simulator for shoebox-shaped rooms, which is also presented in this thesis. The two other tests included real rooms of which the impulse responses were measured binaurally. Statistical analyses were performed on the results to evaluate which factors have a significant effect on the results. In all the tests, significant differences were detected between the rooms. The source signal did also have a significant effect in some situations. Using the results of one of the four tests, the free parameters in the model, like upper- and… Advisors/Committee Members: Gisolf, A., De Vries, D..

Subjects/Keywords: room acoustics; auditory modelling; binaural hearing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Van Dorp Schuitman, J. (2011). Auditory modelling for assessing room acoustics. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b

Chicago Manual of Style (16th Edition):

Van Dorp Schuitman, J. “Auditory modelling for assessing room acoustics.” 2011. Doctoral Dissertation, Delft University of Technology. Accessed April 06, 2020. http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b.

MLA Handbook (7th Edition):

Van Dorp Schuitman, J. “Auditory modelling for assessing room acoustics.” 2011. Web. 06 Apr 2020.

Vancouver:

Van Dorp Schuitman J. Auditory modelling for assessing room acoustics. [Internet] [Doctoral dissertation]. Delft University of Technology; 2011. [cited 2020 Apr 06]. Available from: http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b.

Council of Science Editors:

Van Dorp Schuitman J. Auditory modelling for assessing room acoustics. [Doctoral Dissertation]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; urn:NBN:nl:ui:24-uuid:439c6688-e1c0-478e-b307-a61317c2b85b ; http://resolver.tudelft.nl/uuid:439c6688-e1c0-478e-b307-a61317c2b85b


Delft University of Technology

3. Vogel, P. Application of Wave Field Synthesis in Room Acoustics.

Degree: 1993, Delft University of Technology

Subjects/Keywords: room acoustics; wave field synthesis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Vogel, P. (1993). Application of Wave Field Synthesis in Room Acoustics. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6

Chicago Manual of Style (16th Edition):

Vogel, P. “Application of Wave Field Synthesis in Room Acoustics.” 1993. Doctoral Dissertation, Delft University of Technology. Accessed April 06, 2020. http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6.

MLA Handbook (7th Edition):

Vogel, P. “Application of Wave Field Synthesis in Room Acoustics.” 1993. Web. 06 Apr 2020.

Vancouver:

Vogel P. Application of Wave Field Synthesis in Room Acoustics. [Internet] [Doctoral dissertation]. Delft University of Technology; 1993. [cited 2020 Apr 06]. Available from: http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6.

Council of Science Editors:

Vogel P. Application of Wave Field Synthesis in Room Acoustics. [Doctoral Dissertation]. Delft University of Technology; 1993. Available from: http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; urn:NBN:nl:ui:24-uuid:4d236099-096e-444c-bf40-b7b163076bf6 ; http://resolver.tudelft.nl/uuid:4d236099-096e-444c-bf40-b7b163076bf6

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