Investigation of Reverse Mode Loudspeaker Performance in Urban Sound Classification

Kalmár, György

doi:10.23919/eusipco.2019.8903085

Cited by 3 publications

(7 citation statements)

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“…the response of the speaker to the acoustic event, can be calculated. This methodology was used in [5], where the reverse mode responses were calculated as the outputs of an LTI system characterized by a reverse mode transfer function.…”

Section: Resultsmentioning

confidence: 99%

“…5b, the same event recorded by a 2" full-range speaker with f s = 270 Hz is presented, where the loss of information at higher frequencies and the additional noise can be observed. Based on the methodology used in [5], the spectrogram of an LTI system response is visible in Fig. 5c.…”

Section: Resultsmentioning

confidence: 99%

“…The system is defined by the reverse mode transfer function of the loudspeaker. In [5], additional white Gaussian-noise was added to the output, which step is excluded here.…”

Section: Resultsmentioning

confidence: 99%

“…In this section, the analysis of the reverse mode behavior is presented, which begins with theoretical modeling. These results were partially published in [5], where the specific steps on how to derive an equivalent mechanical circuit were explained in detail. Thus, in the current work, only the major steps are included, and the study is extended with experimental results and measurements.…”

Section: Discussionmentioning

confidence: 99%

“…A recent publication [5] of the author investigated the possibility of utilizing speakers in sound classification tasks. The work showed that speakers are good enough microphones to record sounds from an urban environment.…”

Section: Related Workmentioning

confidence: 99%

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Analysis and Utilization of Reverse Mode Loudspeakers

Kalmár

2020

IEEE Access

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Loudspeakers are designed to radiate sound. However, they can also capture sounds and this microphone-like behavior is called the reverse mode. The paper investigates this backward mechanism by publishing theoretical and practical results. The analysis is based on the construction of an equivalent mechanical model, while the practical results include experiments, simulations, and measurements to further explain the properties of the reverse mode. Potential utilization perspectives of speakers in event detection scenarios are also introduced and a proof-of-concept device is proposed, which performs clap detection with a neural network trained on real-world data. These results proved that accurate event detection can be obtained. During these investigations, it was assumed that the loudspeakers were inactive, i.e. their driving sources were inactive. However, the work also outlines the analysis and explanation of the more challenging problem, called the active reverse mode, in which the acoustic events are being detected through the speaker while it is actively radiating sound.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The system is defined by the reverse mode transfer function of the loudspeaker. In [5], additional white Gaussian-noise was added to the output, which step is excluded here.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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