EFFECTIVENESS OF PREDICTIVE COMPUTER PROGRAMS IN THE DESIGN OF NOISE BARRIERS--A BEFORE AND AFTER APPROACH
A digital data acquisition systems has been designed to meet the need for a long duration noise analysis capability. By sampling the DC outputs from sound level meters, it has been possible to make twenty-four hour or longer recordings, in contrast to the one-hour recordings on seven-inch analog tap reels. The system is made up of a digital tape recorder, an analog-to-digital converter, an outdoor microphone unit, a weatherproofed microphone, two B&K sound level meters, and other miscellaneous equipment. It has the capability of recording and analyzing data from up to eight channels in linear or decibel format. The operation of the system in terms of its setup, calibration, and the recording of digitized signals, as well as the computer programs used to analyze the signals, are described in this report. Listings of computer programs and of a sample problem are supplied in the appendixes. /FHWA/
- Record URL:
- Sponsored by the Department of Transportation, Federal Highway Administration.
Virginia Highway and Transportation Research CouncilCharlottesville, VA United States
- Vailand, J K
- Noble, D F
- Publication Date: 1978-2
- Pagination: 92 p.
- TRT Terms: Before and after studies; Computer programs; Data collection; Design; Digital computers; Measurement; Noise barriers; Sound level
- Old TRIS Terms: Digital systems
- Subject Areas: Design; Environment; Highways;
- Accession Number: 00185265
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-VA-78-R32 Intrm Rpt.
- Contract Numbers: 1483
- Files: NTL, TRIS, USDOT, STATEDOT
- Created Date: Feb 27 1979 12:00AM