Get Analysis of the MPEG-1Layer III (MP3) Algorithm Using MATLAB 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 without doubt one of the such a lot winning audio codecs for shopper audio garage and for move and playback of tune on electronic audio gamers. The MP3 compression average besides the AAC (Advanced Audio Coding) set of rules are linked to the main profitable track gamers of the decade. This e-book describes the basics and the MATLAB implementation information of the MP3 set of rules. a number of of the tedious approaches in MP3 are supported by means of demonstrations utilizing MATLAB software program. The publication offers the theoretical suggestions and algorithms utilized in the MP3 normal. The implementation information and simulations with MATLAB supplement the theoretical rules. The large checklist of references allows the reader to accomplish a extra targeted learn on particular facets 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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At low frequencies, a single line of the FFT constitutes a single partition whereas many lines are combined into a single calculation partition at higher frequencies. The total number of partitions depends on the choice of the sampling rate. For each threshold partition, the energy is derived using the sum of energy densities in the partition. 2. 2). 4 (c) and (d) illustrate the energy and weighted unpredictability in the threshold partitions, respectively. 4 (c) that the perceptual transformation (mapping) expands the low frequency regions and compresses the high frequency regions.

For this reason, the outputs of the 32-band polyphase filterbank are processed using the modified discrete cosine transform (MDCT) block. In essence, the 32 subband samples are further subdivided in the frequency domain using MDCT, thereby providing a good frequency resolution. The polyphase filter bank and the MDCT are together referred as the hybrid filterbank. Being a lapped transform, the MDCT avoids artifacts from the block boundaries, in addition to providing energy compaction. The other important reason for the widespread use of MDCT in certain coding standards is the availability of FFT-based algorithms, which makes it suitable for realtime applications [103, 104].

However, the cascade of the analysis and synthesis filters for each subband channel is a linear phase filter [78]. 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.

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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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