Device with material having acoustic effect

Device with material having acoustic effect

  • CN 100,474,771 C
  • Filed: 09/20/2001
  • Issued: 04/01/2009
  • Est. Priority Date: 09/25/2000
  • Status: Active Grant
First Claim
Patent Images

1. filter, described filter has acoustic effect material (2), and the acoustics constant of described material (2) can partly change at least with tuning described filter in running,It is characterized in that,For tuning described filter in running, described acoustic effect material is in transformation temperature and/or at least in part near transformation temperature.

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