title: A frequency-time domain signal processing system.
abstract: A digital signal processing system for time series analysis with two modes of usage--the first a rapid, hands-on exploratory method, and the second an automatic, printed, labeled graphic output method--is described. The system utilizes a Time Data 1923C system with integral PDP-11 minicomputer, and a console. Major error problems have been contained and a large-volume graphic analysis capability has been developed. Applications include (a) transpulmonary pressure-pulse relationships, (b) elucidation of the multiphasic nature of pulmonary-vein/left-atrial-pressure pulse phenomena, (c) suggestive value of transfer function phenomena as a tool to demonstrate the effect of various loading and ischemic phenomena on the left ventricle, and (d) teaching-demonstration of the techniques of digital signal processing.
mesh_terms: D000703:Analog-Digital Conversion; D001698:Biomedical Engineering / Q000295:instrumentation; D001794:Blood Pressure; D003201:Computers; D003626:Data Display; D006321:Heart / Q000502:physiology*; D011674:Pulse; D014690:Venous Pressure