Classify the following signals according to whether they are (1) one- or multi-dimensional; (2) single or multichannel, (3) continuous time or discrete time, and (4) analog or digital (in amplitude). Give a brief explanation.
(a) Closing prices of utility stocks on the New York Stock Exchange.
(b) A color movie.
(c) Position of the steering wheel of a car in motion relative to car’s reference frame.
(d) Position of the steering wheel of a car in motion relative to ground reference frame.
(e) Weight and height measurements of a child taken every month.