How many bits are needed to digitally record 90 seconds of your favorite music tune? The sampling rate commonly used for music is 44.1 kHz (i.e. 44100 Hz). Each sample is represented using 16 bits. Note that music is usually recorded in stereo, requiring hence twice the number of samples that would be needed for a non-stereo recording of an audio signal Question 2. Using the transposition cipher technique, decrypt the following message: EENRE*ERTEA*GRS The message was encrypted using a grid of 3 by 5 (3 rows, 5 columns) by spiraling inward from the top right of the grid moving clockwise. Question 3. Using the encoding scheme described in the lab exercise 2, and given the color table given below, what will be the digital representation of the following image and the associated compressing ratio? (0.5 mark) The following is the color table used for the encoding scheme described in the lab exercise 2: Color Table Index RGB 0 1 2 3 4 000000 00FF00 FF0000 FFFFFF 0000FF ******* Color