| Presentation | 2019-10-29 Audio spot using subdivided subband delivery from multiple parametric speakers Kazuhiro Kondo, Shinnichiro Osanai, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Parametric array speakers can deliver an audible sound beam by modulating sound using an ultrasonic carrier wave and playing this modulated signal from an ultrasonic transducer array at high levels. Audible sound is demodulated in a narrow beam due to the nonlinear aerial transfer characteristics. However, if sound can be delivered within a small region, i. e., within a spot, sound can be delivered only to the intended subject, and avoid leakage to others. This is partially possible by generating the carrier wave and the side-band signal of the modulated signal from separate arrays, resulting in the full demodulation of an audible sound at the intersection of the two beams. However, we found that some audible noise was generated through demodulation of the side-band signal itself. We observed that the level of this noise is proportional to the relative frequency difference within the side-band signal. Thus, we divided the side-band signal into several sub-bands, limiting the frequency range within each sub-band, and generating them from separate arrays, intersecting only at the spotlight. By using 5 sub-bands, it was possible to limit the spotlight to an effective volume of 0.2 m by 0.2 m by 0.2 m, while the audible noise of the surrounding region was reduced to 20 dB lower levels. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | parametric speakers / audio spot / subdivided side-band |
| Paper # | EA2019-45 |
| Date of Issue | 2019-10-21 (EA) |
| Conference Information | |
| Committee | EA / ASJ-H |
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| Conference Date | 2019/10/28(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | NHK Science&Technology Research Lab. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Engineering/Electro Acoustics, Psychological and Physiological Acoustics, High-Reality Audio, Spatial Audio, and Related Topics |
| Chair | Kenichi Furuya(Oita Univ.) / 小澤 賢司(山梨大) |
| Vice Chair | Suehiro Shimauchi(Kanazawa Inst. of Tech.) / Shigeto Takeoka(Shizuoka Inst. of Science and Tech.) / 鵜木 祐史(北陸先端大) |
| Secretary | Suehiro Shimauchi(NHK) / Shigeto Takeoka(Univ. of Tokyo) / 鵜木 祐史(NTT) |
| Assistant | Keisuke Imoto(Ritsumeikan Univ.) / Daisuke Morikawa(Toyama Pref Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Engineering Acoustics / Auditory Research Meeting |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Audio spot using subdivided subband delivery from multiple parametric speakers |
| Sub Title (in English) | |
| Keyword(1) | parametric speakers |
| Keyword(2) | audio spot |
| Keyword(3) | subdivided side-band |
| 1st Author's Name | Kazuhiro Kondo |
| 1st Author's Affiliation | Yamagata University(Yamagata Univ.) |
| 2nd Author's Name | Shinnichiro Osanai |
| 2nd Author's Affiliation | Alpine Electronics(Alpine) |
| Date | 2019-10-29 |
| Paper # | EA2019-45 |
| Volume (vol) | vol.119 |
| Number (no) | EA-253 |
| Page | pp.pp.59-65(EA), |
| #Pages | 7 |
| Date of Issue | 2019-10-21 (EA) |