Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders
Open-File Report
76-87
By: Jerry P. Eaton
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Abstract
Tests of the standard NCER multiplex system recorded and played back on both the Bell and Howell 3700B (about 0.1% tape speed variation) and on the Sony TC-126 cassette recorder (about 1% tape speed variation) showed that subtractive compensation employing a reference frequency multiplexed on the data track was remarkably effective in reducing tape-speed-variation-induced noise 1 and, hence, in increasing the dynamic range of the record/playback system. Further tests suggested that the 0 to 30 Hz bandwidth of the standard system (8 data channels) might be increased substantially, at the 'price' of reducing the number of data channels to 3 or 4, without serious loss of dynamic range if subtractive compensation could be implemented effectively with the broader-band system.
Suggested Citation
Eaton, J.P., 1976, Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders: U.S. Geological Survey Open-File Report 76-87, ii, 18, [50] leaves :ill.; (71 p. - PGS), https://doi.org/10.3133/ofr7687.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders |
| Series title | Open-File Report |
| Series number | 76-87 |
| DOI | 10.3133/ofr7687 |
| Year Published | 1976 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | ii, 18, [50] leaves :ill.; (71 p. - PGS) |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | N |