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.
But, there are other causes of bad circulation in the toes and feet as well. One common cause of tingling in toes that is very much associated with diabetes in many cases is peripheral neuropathy. This condition is characterized by nerve damage, according to Mayo Clinic. Since various nerves are affected by the condition, symptoms can be different from person to person.