Monday, February 7, 2011

An analog signal has a continuously varying value, with infinite resolution in both time and magnitude. A nine-volt battery is an example of an analog device, in that its output voltage is not precisely 9V, changes over time, and can take any real-numbered value. Similarly, the amount of current drawn from a battery is not limited to a finite set of possible values. Analog signals are distinguishable from digital signals because the latter always take values only from a finite set of predetermined possibilities, such as the set {0V, 5V}.

Wednesday, February 2, 2011

must see website for lectures
http://videolectures.net/mit803f04_lewin_lec13/
Genius speaks
http://www.guardian.co.uk/theguardian/2005/feb/12/weekend7.weekend2