Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders
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.
Citation Information
Publication Year | 1976 |
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Title | Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders |
DOI | 10.3133/ofr7687 |
Authors | Jerry P. Eaton |
Publication Type | Report |
Publication Subtype | USGS Numbered Series |
Series Title | Open-File Report |
Series Number | 76-87 |
Index ID | ofr7687 |
Record Source | USGS Publications Warehouse |