Over-the-Counter

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Mark Gartner

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Hardware Development
Breadboard PCB
Hardware Development
Electrode placement
Normally has 12 leads, each one takes a "picture" of the heart from a different aspect.
Hardware Development
Normal Recording
Hardware Development
Einthoven's Triangle
Hardware Development
Goal: Detect P, R, S, and T waves
P
R
S
T
Hardware Development
Implementing Portable Memory
Current Solution:
Microchip's PIC18F2455
10-bit A/D Converter
Hardware Development
Hardware Development
Hardware Development
Heart Disease & ECG Timing
Heart block (1st,2nd,3rd degree)
Timing irregularity in PR interval
Bundle branch block
Long QRS interval
Arrhythmia
Heart rate too fast or slow (100 BPM)
Myocardial Ischemia
Depressed ST segment
Clinically, the electrocardiogram is a powerful tool in diagnosing certain types of heart disease.
Software Development
Muscle
Contraction
Moving median filter (n=fs) to calculate baseline
Locate areas of muscle contraction using threshold detector (±0.4V from baseline)
Find largest gap of continuous data between
contractions for use in further analysis
If largest gap is smaller than 12 sec,

文档基本属性
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文档格式：	ppt
文档作者：	Mark Gartner
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上次保存者：	Carmen Hayes
修订次数：	187
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幻灯片：	30
段落数：	193
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备注：	4
演示格式：	On-screen Show
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