A Low-Cost System for Quick Measurements on Noise Barriers in Situ

Guidorzi, Paolo; Garai, Massimo

doi:10.1109/tim.2022.3218037

Cited by 8 publications

(8 citation statements)

References 42 publications

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“…This selection not only contributes to cost-effectiveness but also ensures excellent performance. Various initiatives for low-cost instrumentation have also opted for Teensy as their board controller of choice, as observed in [ 45 , 46 , 47 ].…”

Section: Discussionmentioning

confidence: 99%

A High-Resolution LED Stimulator for Steady-State Visual Stimulation: Customizable, Affordable, and Open Source

Otero,

Prieur-Coloma,

El-Deredy

et al. 2024

Sensors

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Visually evoked steady-state potentials (SSVEPs) are neural responses elicited by visual stimuli oscillating at specific frequencies. In this study, we introduce a novel LED stimulator system explicitly designed for steady-state visual stimulation, offering precise control over visual stimulus parameters, including frequency resolution, luminance, and the ability to control the phase at the end of the stimulation. The LED stimulator provides a personalized, modular, and affordable option for experimental setups. Based on the Teensy 3.2 board, the stimulator utilizes direct digital synthesis and pulse width modulation techniques to control the LEDs. We validated its performance through four experiments: the first two measured LED light intensities directly, while the last two assessed the stimulator’s impact on EEG recordings. The results demonstrate that the stimulator can deliver a stimulus suitable for generating SSVEPs with the desired frequency and phase resolution. As an open source resource, we provide comprehensive documentation, including all necessary codes and electrical diagrams, which facilitates the system’s replication and adaptation for specific experimental requirements, enhancing its potential for widespread use in the field of neuroscience setups.

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Section: Discussionmentioning

confidence: 99%

A High-Resolution LED Stimulator for Steady-State Visual Stimulation: Customizable, Affordable, and Open Source

Otero,

Prieur-Coloma,

El-Deredy

et al. 2024

Sensors

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“…These findings support the extensive use of the EN 1793-5 and EN 1793-6 method to evaluate the installed noise barrier on site, which can be used for quality control and long-term performance assessment of the material and installation quality, as attempted for example in [19]. Further research will be devoted to develop a statistically sound procedure to sample a representative set of noise barrier fields, thus avoiding the need to test all fields of a long noise barrier, and to assess the relative advantages and disadvantages of the quick method proposed in [7] versus of the standard method shown here.…”

Section: Discussionmentioning

confidence: 99%

“…Again, two impulse response measurements are done, one in free-field and the other across the barrier, following the configurations in Figure 1 c) and d). A detailed description of these measurement procedures can be found in refs [4]- [7]. Impulse responses were measured using an MLS signal, following the best practices described in refs [8]- [18].…”

Section: Sound Reflection and Insulation Measurementsmentioning

confidence: 99%

“…The A22 measurement system consists of the following instruments: sound source Phon-X with its amplifier, PCB microphones model PCB 130F20, PCB microphone preamplifiers 480B21, RME Fireface UFX II audio interface, Projectlead Traveller Pro 2.0 computer, MCIRMS measurement software. The UNIBO measurement system uses: custom sound source based on Sica Z002601 loudspeaker (120 W, 8 Ω) and class D amplifier model ST CCA044V1, described in [7], PCB microphones model PCB 130F20, IEPE/ICP preamplifier TMP PS12A, MADI digital audio interface RME MADIface XT connected via coaxial cable (MADI protocol) to RME M-16 AD multichannel ADC converter, Projectlead Traveller Pro 2.0 computer, MCIRMS measurement software.…”

Section: Measuring Equipmentmentioning

confidence: 99%

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Advancement of the European Method for In-Situ Measurements on Road Traffic Noise Barriers

Garai,

Guidorzi,

Osele

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The EN 1793-5 and -6 method for measuring the intrinsic acoustic characteristics of noise barriers along motorways (a.k.a. Adrienne method) has been in use for many years and has proven to be robust and provide highly repeatable results. However, some aspects of the method can still be improved. For example, when measuring along a motorway open to traffic or when the entire length of the barrier needs to be evaluated, measurements need to be made quickly and efficiently; on the other hand, accurately positioning the equipment may be time-consuming. Therefore, Autostrada del Brennero and University of Bologna developed a frame for the measuring equipment, to be quickly transported on the test site and positioned with a crane truck. The first results seem very encouraging, however, a detailed study of the repeatability that can be expected during a full-day measurement session on the field is still lacking. This study has been done and is presented in this paper, where the new system is compared with the standard system used at University of Bologna to make the background study for EN 1793-5 and EN 1793-6. Repeated sequences of in-situ measurements have been done with both systems on the same noise barriers and the standard deviation of repeatability has been derived. It is concluded that the new rigid supporting frame has a better standard deviation of repeatability compared to a state-of-the-art equipment.

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Section: Discussionmentioning

confidence: 99%

A High-Resolution LED Display for Steady State Visual Stimulation: Customized, Affordable, and Open Source

Otero,

Prieur-Coloma,

El-Deredy

et al. 2023

Preprint

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Visually evoked steady-state potentials (SSVEPs) are neural responses elicited by visual stimuli oscillating at specific frequencies. In this study, we introduce a novel LED display system designed specifically for steady-state visual stimulation, offering precise control over visual stimulus parameters, including frequency resolution, luminance, and the ability to control the phase at the end of the stimulation. The LED display provides a personalized, modular, and affordable option for experimental setups. Based on the Teensy 3.2 board, the display utilizes Direct Digital Synthesis and Pulse Width Modulation techniques to control the LEDs. Its performance is validated through four experiments: the first two measure LED light intensities directly, while the last two assess the display’s impact on EEG recordings. The results demonstrate that the display can deliver a stimulus suitable for generating SSVEPs with the desired frequency and phase resolution. We provide comprehensive documentation, including all necessary codes and electrical diagrams, as an open-source resource. This facilitates the replication and adaptation of the system for specific experimental requirements, enhancing its potential for widespread use in the field of neuroscience.

show abstract

A Low-Cost System for Quick Measurements on Noise Barriers in Situ

Cited by 8 publications

References 42 publications

A High-Resolution LED Stimulator for Steady-State Visual Stimulation: Customizable, Affordable, and Open Source

A High-Resolution LED Stimulator for Steady-State Visual Stimulation: Customizable, Affordable, and Open Source

Advancement of the European Method for In-Situ Measurements on Road Traffic Noise Barriers

A High-Resolution LED Display for Steady State Visual Stimulation: Customized, Affordable, and Open Source

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