BMM 3114 Tutorial 3

Question 6(a) (pg.138)

You have been assigned to design and produce the audio portions of a multimedia project. The program will be delivered on a CD-ROM, and video clips will take up most of the CD. You have only 50MB of storage space to store 20 one-minute clips of speech, 10 songs averaging three minutes long, and a background sound loop. What sampling rates and depths should you use for the speech, for the music, and for the background sound? Why? Roughly calculate the file size totals for these specifications, and be sure that you end up with less than the 50MB of storage space allotted. Discuss your reasoning.

I would like to use mp3 file format for audio file in the video clip because mp3 format already compressed and reduced the file size.  For my 20 one-minutes speech, I will choose to use 96 kbps bit rate. Then, I would like to use 128kbps bit rate for the songs. Lastly, I choose 128kbps bit rate for my background sound as the quality is better and nice.

Speech

60 seconds * 96 kbps = 5760 kilobits

5760/8 = 720 kilobytes (0.72 megabytes)

0.72 * 20 = 14.4mb

Music

200 seconds * 128kbps = 25600 kilobits

25600/8 = 3200 kilobytes (3.20 megabytes)

3.20 * 10 = 32mb

Background Song

200 seconds * 128kps = 25600 kilobits

25600/8 = 3200 kilobytes (3.2mb)

Total: 14.4+32+3.2 = 49.60mb