9.4 Images & Sounds

# Withcompression4000songs compression compression

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Unformatted text preview: des we can represent depends on the number of bits we use. Values must be rounded to nearest number… in the 1­bit case, “0” or “1” http://www.cs.wfu.edu/~burg/CCLI/Templates/flash.php?file=Chapter5/Quantization.swf Quantization ­ examples Quantization ­ examples 1 .66 .33 0 With 2 bits, we can represent 4 values (0, .33, .66, 1). We still must round, but rounding error is less, and curve is more closely approximated. A/D and D/A converters A/D and D/A converters Sound Cards and what they do: http://computer.howstuffworks.com/sound-card.htm Space considerations Space considerations Sample Rate x Quantization x Duration Raw audio 44.1Khz x 16 bits = 705Kbits/sec = .7 Mbits/sec stereo = 1.4 Mbits/sec 3­minute song = 252 Mbits ≈ 32 Mbytes 16 Gb iPod holds 16000/32 = 500 songs (without compression. with compression:...
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## This document was uploaded on 04/02/2014.

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