发明授权
- 专利标题: Ultrasound based parametric loudspeaker system
- 专利标题(中): 基于超声的参数化扬声器系统
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申请号: US10118630申请日: 2002-04-08
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公开(公告)号: US07181025B2公开(公告)日: 2007-02-20
- 发明人: Guido Kolano , Klaus Linhard
- 申请人: Guido Kolano , Klaus Linhard
- 申请人地址: DE Stuttgart
- 专利权人: DaimlerChrysler AG
- 当前专利权人: DaimlerChrysler AG
- 当前专利权人地址: DE Stuttgart
- 代理机构: Akerman & Senterfitt
- 代理商 Stephan Pendorf; Yonghong Chen
- 优先权: DE10117529 20010407
- 主分类号: G05B15/00
- IPC分类号: G05B15/00
摘要:
A parametric loudspeaker system is described which is based upon the FM-modulation of an ultrasound carrier. Known systems work with AM-modulation. The FM-modulation produces a good matching to the resonant transducer such as the conventionally employed piezo-ceramic transducers. The resonance slope of the transducers is used for FM/AM-conversion. This FM-resonance principle can advantageously be employed in a multi-path loudspeaker system, in which the transducer works in the optimal resonance range in each of the paths. With the conventional AM-modulation this is not possible. The FM-resonance principle can also be used in resonance-free or resonance-poor transducers, such as for example electrostatic transducers.
公开/授权文献
- US20020172375A1 Ultrasound based parametric loudspeaker system 公开/授权日:2002-11-21