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.
There are many reasons for numbness and tingling in the feet. Sometimes the cause originates in the feet and other times it a systemic cause meaning there is a disease process in the body that manifests in the feet. The number one cause of burning/numbness/tingling/pins and needles sensation in the foot in the US is diabetes.