• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Effects of Filter Response on Analysis of Aircraft Noise Data.
【24h】

Effects of Filter Response on Analysis of Aircraft Noise Data.

机译：滤波器响应对飞机噪声数据分析的影响。

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This report analyzes the effects of non-ideal filter transmission characteristics upon the measurement, correction, or extrapolation of aircraft noise dat a. The report is based primarily upon, and represents an abbreviated summary of, two previously published, more detailed reports on this topic. The basic approach used to correct aircraft spectra for analysis errors due to finite filter sidebands and signal spectrum slopes involves defining same type of approximation to the true spectrum shape of all frequencies. The closer this approximation is to the true spectrum slope, the more accurate the correction for filter effects. This report reviews several such filter effect correction methods of varying degrees of accuracy. Measurements on the ground of noise from aircraft in flight can involve propagation distances of the order of 300 to 2,000 m or more. In this case, band levels at high frequencies can be substantially in error, by more than 10 dB, unless filter effects are considered. However, it is also shown that while the band levels may be subject to large errors due to filter effects , errors in composite noise levels such as PNL, LA or EPNL will usually be small - less than 1 dB.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号