Compensation for Nonlinear Distortion of the Frequency Modulation-Based Parametric Array Loudspeaker

Hatano, Yuta; Shi, Chuang; Kajikawa, Yoshinobu

doi:10.1109/taslp.2017.2705280

Cited by 13 publications

(7 citation statements)

References 25 publications

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“…In addition, the frequency modulation-based parametric array loudspeaker has been proposed in recent years, which has the advantages of low cost and high efficiency compared with the amplitude modulation-based parametric array loudspeaker, but also has the disadvantage that complex nonlinear distortion is difficult to suppress. Hatano et al 35 designed a complex inverse system using Volterra filters to reduce nonlinear distortion and demonstrated the feasibility of parametric array loudspeakers based on frequency modulation methods through simulation and experiment.…”

Section: Parametric Array Loudspeaker Technologymentioning

confidence: 99%

A brief review of independent sound zone technology

Zhang¹,

Wen²,

Zhang³

et al. 2023

Noise & Vibration Worldwide

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Independent sound zone technology aims to construct multiple independent sound zones with different sound fields, which are independent of each other and do not interfere with each other, and has wide research value and application prospects in today’s increasingly complex received information. To help scholars preparing to investigate independent sound zone techniques get started quickly, this paper presents research advances in three independent sound zone construction methods based on loudspeaker arrays, sound field reconstruction and parametric array loudspeakers, including the implementation principles and optimization schemes of these methods.

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Section: Parametric Array Loudspeaker Technologymentioning

confidence: 99%

A brief review of independent sound zone technology

Zhang¹,

Wen²,

Zhang³

et al. 2023

Noise & Vibration Worldwide

View full text Add to dashboard Cite

show abstract

“…The hardware platform of the phased array beam control system is the basis of beam synthesis and the key to ensuring the stable operation of the system [9]. The hardware structure of the synthetic system designed in this paper is shown in Figure 2, which mainly includes the control module, beam transmitting module, signal receiving module, and data interface module.…”

Section: System Design Based On Fpgamentioning

confidence: 99%

Design and Implementation of Beam Control System Based on FPGA

2023

J. Phys.: Conf. Ser.

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As the use of phased array technology becomes more widespread, it is receiving increased attention. Among them, the excellent performance of the beam control system will directly affect the performance of the whole phased array. FPGA is the preferred control chip for developing a beam control system. Therefore, this paper designs a beam control system architecture based on FPGA, designs the main functional modules of the system in detail, and conducts simulation experiments on its important functions. The results show that the system can quickly and accurately calculate the phase shift code required by the antenna unit to achieve fast beam response.

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“…Due to the low-cost of its implementation, FM-based methods have also been analyzed empirically [31]. However, demodulating FM waves causes higher harmonic distortions at conventional sound pressure levels.…”

Section: Preprocessing Techniquesmentioning

confidence: 99%

Experimental Evaluation of Distortion in Amplitude Modulation Techniques for Parametric Loudspeakers

et al. 2020

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Parametric loudspeakers can generate a highly directional beam of sound, having applications in targeted audio delivery. Audible sound modulated into an ultrasonic carrier will get self-demodulated along the highly directive beam due to the non-linearity of air. This non-linear demodularization should be compensated to reduce audio distortion, different amplitude modulation techniques have been developed during the last years. However, some studies are only theoretical whereas others do not analyze the audio distortion in depth. Here, we present a detailed experimental evaluation of the frequency response, harmonic distortion and intermodulation distortion for various amplitude modulation techniques applied with different indices of modulation. We used a simple method to measure the audible signal that prevents the saturation of the microphones when the high levels of the ultrasonic carrier are present. This work could be useful for selecting predistortion techniques and indices of modulation for regular parametric arrays.whereand ω are the amplitude and the angular frequency of the carrier, and ( ) is the 4 This dependence implies that the self-demodulated wave ( ) is not linear to ( ) and that it will 5 suffer from high levels of distortion due to the generated harmonics and a strong low-pass 6 equalization. 7 Various preprocessing techniques have been developed to reduce distortion using different 8 modulations of the envelope ( ). Existing experimental measurements [8-10] are mostly based on 9 the total harmonic distortion or at certain representative frequencies, which may not completely 10 capture the non-linear response of the speakers. Here, we present an extensive comparison of the 11 different amplitude modulation techniques under various modulation indices in terms of frequency 12 response, harmonic distortion and intermodulation distortion. This study analyzes the 13 intermodulation distortion and the harmonics distortions of the different amplitude modulation 14 techniques for various modulation indices. Furthermore, the analysis is split by order. To avoid the 15 presence of spurious signal in the measurements, our method previously selects a dynamic 16 microphone with limited frequency response.

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Compensation for Nonlinear Distortion of the Frequency Modulation-Based Parametric Array Loudspeaker

Cited by 13 publications

References 25 publications

A brief review of independent sound zone technology

A brief review of independent sound zone technology

Design and Implementation of Beam Control System Based on FPGA

Experimental Evaluation of Distortion in Amplitude Modulation Techniques for Parametric Loudspeakers

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