Measurement of Loudspeakers with a Laser Doppler Vibrometer and the Exponential Sine Sweep Excitation Technique

Bellini, Maria Costanza; Collini, Luca; Farina, Angelo; Pinardi, Daniel; Riabova, Kseniia

doi:10.17743/jaes.2017.0017

Cited by 9 publications

(6 citation statements)

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“…They are generated by defects caused during the manufacturing process, ageing and other external factor such as overload and temperature. A well-known technique commonly used in audio environment to completely characterize the system with a single, fast and easy measurement was introduced in [8], [9], [10]. It is based on exponentially swept sine signal defined as:…”

Section: Micro-doppler Analysismentioning

confidence: 99%

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Radar Based Loudspeaker Measurements

Izzo¹,

Ausiello²

2021

Reproduced Sound 2021

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Section: Micro-doppler Analysismentioning

confidence: 99%

Section: Mechanical Characterization Of a Speakermentioning

confidence: 99%

Radar Based Loudspeaker Measurements

Izzo¹,

Ausiello²

2021

Reproduced Sound 2021

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“…Assuming that the driver plays an exponential sine sweep signal x (t) [9], then an arbitrary point of the cone located in P vibrates with instantaneous vibration frequency f v (t) equals to:…”

Section: Radar Signal Model and Mfr Computationmentioning

confidence: 99%

Radar based deep learning technology for loudspeaker faults detection and classification

Izzo

Clemente

Ausiello

et al. 2020

2020 IEEE Radar Conference (RadarConf20)

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“…The resulting distortion depends highly on the amplitude and type of the stimulus. A well known technique commonly used in audio environment to completely characterise the system with a single, fast and easy measurement was introduced in [16]- [18]. It is based on exponentially swept sine signal defined as:…”

mentioning

confidence: 99%

“…Commonly used in radar is the matched filter technique, obtained by correlating a known signal with an unknown signal to detect the presence of the template in the unknown signal. This is the radar equivalent of the acoustic measurement technique introduced in [16]- [18], where the unknown signal is convolved with a conjugated time-reversed version of the template. With this technique the speaker can be mechanically characterized.…”

mentioning

confidence: 99%

Loudspeaker Analysis: A Radar Based Approach

et al. 2020

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Recently, radar based micro-Doppler signature analysis has been successfully applied in various sectors including defence, biomedical, and automotive. This article presents the novel use of radar micro-Doppler for loudspeaker analysis. The approach offers the potential benefits of characterizing the mechanical motion of a loudspeaker in order to identify defects and design issues. Compared with acoustic based approaches, the use of radar allows reliable measurements in an acoustically noisy end of a production line. In addition, when compared with a laser vibrometric approach, the use of radar micro-Doppler reduces the number of measurements required and provides direct access to the information of the metallic components of the loudspeaker. In the paper experimental results and analysis of the micro-Doppler signatures of loudspeakers using low cost radar systems are presented. Based on Thiele&Small parameters, the voice coil displacement is modelled and micro-Doppler signatures for a single tone and a sine sweep stimulus are presented. Furthermore, in order to characterize the speaker with a single radar measurement, a methodology to measure mechanical frequency response of loudspeakers is also shown. 19 Index Terms-Radar, micro-Doppler, micro-Doppler analysis, loudspeaker analysis, industrial processes. I. INTRODUCTION 20 L OUDSPEAKERS condition monitoring is an important 21 topic in audio manufacturing. Laser based analysis tools 22 have been shown [1] to yield significantly better results 23 compared to traditional acoustic ones. The former approach 24 is more frequently used in advanced markets like automotive 25 audio components and systems, while the latter is widely 26 used in R&D and manufacturing of acoustic transducers and 27 consumer products (e.g. loudspeakers or audio products).

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Measurement of Loudspeakers with a Laser Doppler Vibrometer and the Exponential Sine Sweep Excitation Technique

Cited by 9 publications

References 0 publications

Radar Based Loudspeaker Measurements

Radar Based Loudspeaker Measurements

Radar based deep learning technology for loudspeaker faults detection and classification

Loudspeaker Analysis: A Radar Based Approach

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