Analog Voice Characteristics. Analog is defined as a signal that has a continuously and smoothly varying amplitude or frequency. Human speech, and everything else you hear, is in analog form, and early telephone systems were analog as well. Analog signals are often depicted as smooth sine waves, but voice and other signals are more complex than that, since they contain many frequencies.
There are numerous potential causes of fatigue as a major complaint. They range from those that cause poor blood supply to the body's tissues to illnesses that affect metabolism, from infections and inflammatory diseases to those that cause sleep disturbances. Fatigue is a common side effect of many medications. While numerous patients with psychological conditions often complain of fatigue (physical and mental), there are also a group of patients where the cause of fatigue is never diagnosed. The following table summarizes some common causes of fatigue but is not meant to be comprehensive:
Causes of Extreme Fatigue. The Most Common Reasons for Excessive Fatigue. Discovering the causes of extreme fatigue can be difficult if you don't know the distinctions between fatigue and sleepiness. Some disorders cause fatigue, others sleepiness, and some disorders cause a mix of these two. The question is: Are you tired, sleepy, or fatigue? In this page you will learn: 1  What is extreme fatigue, compared to sleepiness and tiredness, 2  What causes extreme fatigue, including most common disorders and medication, 3  Useful questionnaire to test your excessive fatigue, 4  How to stop fatigue in a sleep apnea patient.