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Chapter 14 provides knowledge of MPEG audio. After studying this chapter you will be able to understand: Audio compression (MPEG and others), simple but limited practical methods, psychoacoustics or perceptual coding,. | CM3106 Chapter 14 MPEG Audio Prof David Marshall dave.marshall@cs.cardiff.ac.uk and Dr Kirill Sidorov K.Sidorov@cs.cf.ac.uk www.facebook.com kirill.sidorov CARDIFF UNIVERSITY PRIFYSCOL CAERpv School of Computer Science Informatics Cardiff University UK Audio Compression MPEG and Others As with video a number of compression techniques have been applied to audio. RECAP Already Studied Traditional lossless compression methods Huffman LZW etc. usually don t work well on audio compression For the same reason as in image and video compression Too much change variation in data over a short time CM3106 Chapter 14 MPEG Audio Audio Compression Introduction 1 Simple But Limited Practical Methods Silence Compression detect the silence similar to run-length encoding seen examples before Differential Pulse Code Modulation DPCM Relies on the fact that difference in amplitude in successive samples is small then we can used reduced bits to store the difference seen examples before CM3106 Chapter 14 MPEG Audio Audio Compression Introduction