Spatial and temporal acoustic diagnosis
Segregation of direct sound and reflections
Ease detection of acoustical problems
September 2015
Beginning of research in order to innovate in the analysis on acoustics
October 2015
Jornadas de Audio, Sonido y Acústica, University of Tres de Febrero
Download full paperJune 2016
Meeting of sound engineering, University of San Buenaventura
Download full paperJuly 2016
Latin American Conference AES
Download full paperSeptember 2016
International Congress on Acoustics
Download full paperMay 2017
Audio Engineering Society Section Colombia
Download book
The tab of the measurement list allows you to select a previous calculation, discard calculations and position calculations in a plant graph.
Measurement List tab
Finally, the direct sound selection tab allows you to choose which of the first windows represents the direct sound. For this pre-selection, the highest level peaks are obtained and interpreted as the center of the direct sound. For a first instance of calculation, the first one is taken in a temporal order. After the calculation is made, the user can choose to modify the direct sound chosen automatically by one of the others and perform the calculations again.
Direct Sound Selection Tab
The program presents the response of the linear phase FIR filter, of order 400 used in each window and additionally a spectrogram of the pressure level signals to understand the energy dispersion of the IR
2D graphics panel
A plant view allows you to evaluate several IRs at the same time. For this it is necessary to have a plant view of the measurements. The program generates a top view of each IR and then place them manually in the plant view.
In the last tab, the calculated values of each window are shown in time, magnitude, azimuth and elevation.
2D graphics panel
The information are represented as sound vectors with the same origin and different direction. The vectors represents each of the time windows. Its magnitude is given by the energy sum the intensity vectors. The magnitudes are normalized based on the direct sound. The color symbolizes the temporal distance to the direct sound (red to blue).
3D graphics panelThe information are represented as sound vectors with the same origin and different direction. The vectors represents each of the time windows. Its magnitude is given by the energy sum the intensity vectors. The magnitudes are normalized based on the direct sound. The color symbolizes the temporal distance to the direct sound (red to blue).
3D graphics panel
Results were not manually oriented towards the source, the directions are produced by the algorithm interpretation.
The measuring positions of the corners acquire lateral energetic components comparable in magnitude to the direct sound. This is due, to a greater extent, to the proximity of the surfaces and their low absorption rate. This situation is not reflected in the central positions, where the reflecting surfaces are arranged at a greater distance. In the same way it is clearly observed that in the position closest to the source, the direct sound acquires a greater degree of prominence with respect to the graphed vectors. This is due to the fact that the lateral reflections affect with less energy, and the direct soundis more influential.
In the same way it is clearly observed that in the position closest to the source, the direct sound acquires a greater degree of prominence with respect to the graphed vectors. This is due to the fact that the lateral reflections affect with less energy, and the direct sound is more influential.
The left lateral position acquires a pattern that differs from the rest of the positions. The direct sound is very weakened in comparison to its left lateral energy of great magnitude and immediate to the direct sound, reason why it can be inferred that it is a very committed zone. In it there is a lot of energy coming from the back and right, that although it is a little more distant temporarily to the direct sound, it remains above the critical range of sound clarity. This situation is not repeated at the opposite end of the room. In this place, early energy predominates over late energy, therefore the presence of direct sou nd plays a major role accompanied by a strong
In the figure we can observe the distribution of the measurement and source positions, with the results of IR obtained. In this case, the measurement positions maintained the microphone orientation in the direction of the source.
It should be noted how the different lateral contributions are arranged in each of the measurement positions. This is mainly due to the proximity of the reflecting surfaces to the positions of the microphones.
The position R1 maintains a great energetic influence of the frontal field with proximity to the direct sound. It is possible to observe how the rear energy radiates with a lower level and in times longer than 120ms. From a superior view, it is possible to notice strong lateral contributions, product of first order reflections with the walls of the room.
The R2 position maintains a great influence of the direct sound, product of which it is located in the central zone of the room, where the sound energy disperses easily. Together the source is located in proximity to the measurement position, favoring its influence on the plotted IR. There is also a great influence of lower frontal energy within 50ms, probably originating from a low order reflection with the ground of the room.
The R3 position contains a large amount of surrounding reverberant energy, this can mean a deterioration in the sound clarity of the listener. A large amount of frontal energy is observed coming from different reflections at times close to the direct sound. The back energy is weaker and corresponds to the late energy close to 200 ms.
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