ERRORS DUE TO TEMPORAL SAMPLING
Statistical techniques allow the prediction of the error (expressed as a standard deviation about the measured energy equivalent sound level or time exceedance level) due to temporal sampling of a time-varying signal. These predicted standard deviations are compared with experimentally determined values, obtained by computer sampling of large sets of actual field data recorded at a highway, an airport, a suburban road, and a rural residence. The predicted standard deviations, for the example given, of sampling at 30 s intervals for 1 h, range from 0.3 to 8 dB. These values agree closely with the experimentally determined values, and the small remaining discrepancies are explained. For 'continuous' (or very frequent) sampling, an 'effective number' of independent samples is used, computed from the autocorrelation in the time-varying signal.
- Pub. in Proc. American Society for Testing and Materials Symp. on Community Noise, Kansas City, MO, May 24-26, 1978, Am. Soc. Test. Mater. Spec. Tech. Publ. 692, p172-182 Nov 79.
National Bureau of StandardsConnecticut Avenue at Van Ness Street, NW
Washington, DC United States 20008
- Publication Date: 1979-11
- Pagination: 11 p.
- TRT Terms: Airports; Data analysis; Error analysis; Errors; Field tests; Highways; Marking materials; Mathematical analysis; Noise; Roads; Sampling; Sound level; Standard deviation
- Subject Areas: Aviation; Environment; Highways; Terminals and Facilities;
- Accession Number: 00313811
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: Final Rpt.
- Files: TRIS
- Created Date: Jun 26 1980 12:00AM