Document Detail

Cancellation of coherent line-frequency noise in evoked potential recordings.
MedLine Citation:
PMID:  7382903     Owner:  NLM     Status:  MEDLINE    
A stimulator for evoked potential recording can become synchronized with the fundamental or harmonics of the line frequency, thus introducing interference which cannot be removed by averaging. Synchronizing the stimulus alternately to the positive-going and negative-going zero-crossing of the line will reduce 60 Hz and odd harmonics, but will not reduce higher even-harmonics. This communication describes a circuit that synchronizes the stimulus to the alternate phases of the line, but also introduces a random delay between zero and one-half the line period, thus reducing the fundamental and higher harmonics as well.
J J Ackmann; F J Antonich; R E Halbach
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medical instrumentation     Volume:  14     ISSN:  0090-6689     ISO Abbreviation:  Med Instrum     Publication Date:    1980 May-Jun
Date Detail:
Created Date:  1980-08-28     Completed Date:  1980-08-28     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  0361136     Medline TA:  Med Instrum     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  178-80     Citation Subset:  IM    
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MeSH Terms
Electronics, Medical* / instrumentation
Evoked Potentials*
Monitoring, Physiologic

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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