1- A common measure of transmission for digital data is the number of bits transmitted per second (bit/s). Generally , transmission is accomplished in packets consisting of a byte(8 bits) of information and a stop bit Using this approximation , answer the following :

(a) How many minutes would it take to transmit a 512*512 image with 256 gray levels at 9600 bit/s ?

(b) What should be the capacity (bit/s) of a digital transfer channel , if images described in item a (25 images/second) are to be transferred in real time ?