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Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders

Open-File Report 76-87

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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.

Additional Publication Details

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
Edition:
-
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