A Proposal for Low Frequency Loudspeaker Design Utilizing Ultrasonic Motor

Negishi H, Ohga J, Oohira I. A Proposal for Low Frequency Loudspeaker Design Utilizing Ultrasonic Motor. In: AES Convention 119. Audio Engineering Society; 2005. Paper 6581. Available from: https://aes.org/publications/elibrary-page/?id=13318

@inproceedings{Negishi2005_13318,
  author = {Negishi, Hirokazu and Ohga, Juro and Oohira, Ikuo},
  title = {{A Proposal for Low Frequency Loudspeaker Design Utilizing Ultrasonic Motor}},
  booktitle = {AES Convention 119},
  note = {Paper 6581},
  year = {2005},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=13318}
}

TY  - CPAPER
TI  - A Proposal for Low Frequency Loudspeaker Design Utilizing Ultrasonic Motor
AU  - Negishi, Hirokazu
AU  - Ohga, Juro
AU  - Oohira, Ikuo
T2  - AES Convention 119
M1  - Paper 6581
PY  - 2005
DA  - 2005/10/06
UR  - https://aes.org/publications/elibrary-page/?id=13318
PB  - Audio Engineering Society
LA  - en
AB  - Limitations of low frequency sound reproduction ability of the conventional direct-radiator loudspeakers is essential because the diaphragm of them must be driven in a mass-controlled range for a flat response. This paper proposes a novel direct-radiator loudspeaker suitable for low-frequency signal radiation. It utilizes a ultrasonic motor (USM) including a piezoelectric transducer. A velocity modulated continuous revolution is better than a reciprocal motion to avoid distortion in wave form due to the difference between dynamic and static frictional forces. A few fundamental ideas, a continuously revolving flat radiator, an air-flow modulation type without any mechanical radiator and a conventional radiator actuated by a revolving mass are compared to investigate merit of the loudspeaker proposed here.
ER  -