5 DigitalMedia HOF.pdf - Example of Huffman...

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EECS 1520 Week 5 . 3a February 2, 201 8 page 1 Example of Huffman Encoding/Decoding Table Huffman Code Character 00 A 01 E 100 L 110 O 111 R 1010 B 1011 D Message: DOORBELL Encoding: 1011110110111101001100100 Compression Ratio (vs. ASCII): 25/64 = 0.39 Decode: Representing Audio Information physics of sound - speaker to ear of listener through air - sound information carried by an electronic wave (e.g. radio) electronic wave is analog digitize signal by periodically measuring voltage and recording these readings as a series of (binary) numbers Nyquist’s Theorem: sampling frequency must be 44MHz (44,000 times/sec) for accurate sound reproduction (otherwise: aliasing)
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EE CS 1520 Week 5 . 3a February 2, 201 8 page 2 Audio Formats Examples: wav, au, aiff, vqf, mp3 All use some form of compression MP3 Audio Format MPEG-2 audio layer 3 uses lossy and lossless compression lossy: uses mathematical models of human psychoacoustics to discard
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