7e Chapter 8 Part 2 - MSIS 2103 Chapter 8 Part 2 1 How is...

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MSIS 2103 Chapter 8 – Part 2 1
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How is Music Digitized?
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Sampling Rate When analog waves are digitized, the waves are “sampled” – these are “readings” that are taken a certain number of times per second So the sampling rate is the number of times per second the music is measured and converted to a digital value 64 kbps and 320 kbps are examples of
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4 Portable Media Players (PMPs) Small devices that store and play music Many also handle video and still images Many formats for storing files MP3, AAC, and WMA for music DivX, MPEG-4, MP4 (subset of MPEG- 4),WMV and XviD for video How much music/video can be
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5 Portable Media Players (PMPs) Some PMP’s use removable flash memory cards for storing music and can accept other flash memory cards if needed Other PMPs have internal permanent flash memory Some have internal hard drives – esp. those that play video (some have capacities of up to 160 Gbps)
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Sampling Rates - Example Suppose you have a 1 Gigabyte hard drive on your MP3 player You rip (convert) songs from your CD to an MP3 file using a 192 kbps sampling rate Your MP3 player will store about 694 minutes of music You rip songs using a 64 kbps sampling rate 6
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7 PMP Flash Memory Flash memory cards can add memory to portable media players if they are set up to work with them Nonvolatile Noiseless Use very little power Hold between 64 MB and 4 GB of data
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Portable Media Players (PMPs) Apple iPod touch – fixed amount of flash memory (flash memory is non-volatile) Still holds 8 Gbps to 64 Gbps (14,000 songs or 80 hours of video)
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Other Choices for Portable Media Management Some digital camera models Sony Playstation Portable – play video games, play music and video files, and browse the Internet Global positioning systems (GPS) – organize music and photos; deliver turn-by- turn instructions; give real-time traffic information 9
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10 PMP Ethical Issues Is it illegal to download MP3 files? MP3.com – a reputable site from early on Song files are on a public server Permission is given by the artist or recording company to place the files on the server A fee is paid to download a file
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11 PMP Ethical Issues Is it illegal to download MP3 files? Mp3.com was legal, ethical, fine Some user frustration in the early days because popular music was limited on this site, and sometimes download links didn’t work
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12 PMP Ethical Issues Is it illegal to download MP3 files?
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