Theoretical and Experimental Comparison of Amplitude Modulation Techniques for Parametric Loudspeakers

Ji W, Gan WS, Ji P. Theoretical and Experimental Comparison of Amplitude Modulation Techniques for Parametric Loudspeakers. In: AES Convention 128. Audio Engineering Society; 2010. Paper 8006. Available from: https://aes.org/publications/elibrary-page/?id=15303

@inproceedings{Ji2010_15303,
  author = {Ji, Wei and Gan, Woon-Seng and Ji, Peifeng},
  title = {{Theoretical and Experimental Comparison of Amplitude Modulation Techniques for Parametric Loudspeakers}},
  booktitle = {AES Convention 128},
  note = {Paper 8006},
  year = {2010},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=15303}
}

TY  - CPAPER
TI  - Theoretical and Experimental Comparison of Amplitude Modulation Techniques for Parametric Loudspeakers
AU  - Ji, Wei
AU  - Gan, Woon-Seng
AU  - Ji, Peifeng
T2  - AES Convention 128
M1  - Paper 8006
PY  - 2010
DA  - 2010/05/06
UR  - https://aes.org/publications/elibrary-page/?id=15303
PB  - Audio Engineering Society
LA  - en
AB  - Due to the self-demodulation property of finite amplitude ultrasonic waves propagating in air, a highly focused sound beam can be reproduced. This phenomenon is known as the parametric array in air. However, because of the nonlinearity effect of ultrasonic waves, the reproduced sound wave suffers from high distortion. Several amplitude modulation techniques have been previously proposed to mitigate this problem. Currently, no comprehensive study has been carried out to evaluate the performance of these amplitude modulation techniques. This paper attempts to provide theoretical and experimental studies of the effectiveness in mitigating the distortion from different amplitude modulation techniques. Objective measurements, such as sound pressure level and total harmonic distortion are used to compare the performance of these modulation techniques.
ER  -