Analysis of the MPEG-1Layer III (MP3) Algorithm Using MATLAB by Jayaraman J. Thiagarajan and Andreas Spanias PDF

By Jayaraman J. Thiagarajan and Andreas Spanias

ISBN-10: 1608458016

ISBN-13: 9781608458011

ISBN-10: 1608458024

ISBN-13: 9781608458028

The MPEG-1 Layer III (MP3) set of rules is likely one of the so much profitable audio codecs for customer audio garage and for move and playback of tune on electronic audio gamers. The MP3 compression general besides the AAC (Advanced Audio Coding) set of rules are linked to the main profitable tune gamers of the decade. This ebook describes the basics and the MATLAB implementation info of the MP3 set of rules. a number of of the tedious strategies in MP3 are supported via demonstrations utilizing MATLAB software program. The e-book provides the theoretical innovations and algorithms utilized in the MP3 normal. The implementation info and simulations with MATLAB supplement the theoretical ideas. The large record of references allows the reader to accomplish a extra exact examine on particular features of the set of rules and achieve publicity to developments in perceptual coding. desk of Contents: creation / research Subband clear out financial institution / Psychoacoustic version II / MDCT / Bit Allocation, Quantization and Coding / Decoder

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Therefore, the entire filter bank is of linear phase and the aliasing will only result in amplitude distortion. Though the aliasing errors of the filters appear substantial from the frequency responses, they are reduced substantially during reconstruction. The reader is referred to [7, 79, 80, 81, 82, 83, 84, 85] for further details on filter banks and their design. 5. 7: Time domain and Frequency responses of the filter bank. Subbands 0,1 and 31 are shown, respectively. 1 DESCRIPTION The MPEG-I psychoacoustic model plays a central role in the compression algorithm.

Prior to applying the MDCT to the subbands, each of the odd samples of odd subbands must undergo a frequency inversion correction so that the spectral lines appear in a proper ascending order. 1, the inversion is applied by multiplying each odd sample by -1 to compensate for the frequency inversion of the polyphase filter bank. 2. 1: MATLAB Code for frequency inversion correction. The psychoacoustic model detects the pre-echo condition and chooses short windows for better time resolution and long windows for improved frequency resolution.

2. 12 (c) illustrates the SMR in the scalefactor bands for the case when a long window is used. 8 shows the window switching and threshold computation for the case when long blocks are used. Similar steps can be carried out to perform the window switching and threshold computation for the case when short windows are to be used. Thus, the threshold calculation partitions are converted to codec partitions (scale-factor bands) and the SMR values computed are forwarded to the bit/noise allocation algorithm.

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Analysis of the MPEG-1Layer III (MP3) Algorithm Using MATLAB by Jayaraman J. Thiagarajan and Andreas Spanias

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