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Digital Cardiac Period Meter With DA Converter
Author(s) -
Shimizu Hidemi
Publication year - 1977
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1977.tb02976.x
Subject(s) - oscillograph , waveform , metre , heartbeat , pulse (music) , polling , electrical engineering , period (music) , computer hardware , acoustics , computer science , physics , voltage , engineering , computer security , astronomy , operating system
A new type of cardiac period meter, which allows the simultaneous collection of digital and analog records, was designed. The wave‐shaper and the pulse sequencer in a digital counter were modified for the purpose of measuring successive heartbeat intervals. The output terminals of the counter were connected directly to a digital‐to‐analog (DA) converter. The pen‐oscillograph record of the analog output produces a stair‐case waveform characterized by sharp edges and stable horizontal lines.