Analog signals are continuous in both time and value. Analog signals are used in many systems, although the use of analog signals has declined with the advent of cheap digital signals. Digital signals are sampled, quantized & encoded version of continuous time signals which they represent.
Causes of Tingling in the Hands and Feet. Diabetes is one of the most common causes of peripheral neuropathy, accounting for about 30% of cases. In diabetic neuropathy, tingling and other symptoms often first develop in both feet and go up the legs, followed by tingling and other symptoms that affect both hands and go up the arms. About two-thirds of people with diabetes have mild to severe forms of nerve damage.
When the legs and feet experience a deficit in the amount of blood flowing in their veins, plaque or cholesterol can build up. This can cause atherosclerosis in the legs and feet, and cause pain, tingling, and numbness. This is a problem for diabetics in particular; this condition is known as diabetic neuropathy. People who have frostbite also can have numbness and tingling in the feet because of the lack of blood flowing to the extremities. Medical Conditions