Evaluation of jitter in multichannel tape recorders used in shaft motion reproducers
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Authors
Gussow, Milton
Hawe, S. Russell
Thyberg, Robert C.
Subjects
Advisors
Wrigley, Walter
Date of Issue
1957-05
Date
Publisher
Massachusetts Institute of Technology
Language
Abstract
An investigation was undertaken on a highly accurate system based on phase information for the recording of shaft motion in an airborne test vehicle or in other severe and confined environment for later reproduction. The investigation showed that the major contribution to the error of the system was due to interchannel time jitter in a multichannel magnetic tape recorder. Measurement and calibration techniques were devised to obtain experimental data on interchannel jitter to determine the characteristics of this interference. Results from the experimental data indicated that jitter could introduce large errors in the shaft recording and reproduction system. Analysis of the data formed a basis for the design of a compensation circuit to reduce the effects of jitter on the system error in order to meet the high accuracy requirements. Experimental data of a jitter compensating circuit showed a significant decrease in interchannel jitter. Improvement of circuit design will result in further reduction of jitter error. The investigation showed that jitter can be reduced so that a high degree of accuracy can be attained for instrumentation utilizing multichannel tape recorders.
Type
Thesis
Description
Series/Report No
Department
Aeronautical Engineering