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Moving Picture Experts Group Layer 3 - MP3MPEG layer 3 is a lossy audio coding standard that uses a relatively high-complexity audio analysis system to characterize and highly compress audio signals. The MP3 system achieves high-compression ratios (10:1 or more) by removing redundant information and sounds that the human ear cannot detect or perceive. The removal of information components that cannot be detected (such as low level signals that occur simultaneously with high-level signals) is called psychoacoustic compression. To obtain high fidelity quality (e.g. music) with MP3 typically requires 64 kbps per audio channel. The MP3 codec was standardized by the ISO/IEC Moving Picture Experts Group (MPEG) committee in 1992. MP3 is intended for high-quality audio (like music) and expert listeners have found some MP3-encoded audio to be indistinguishable from the original audio at bit rates around 192 kbps. The design of the Layer 3 (MP3) codec was constrained by backward compatibility with the Layer 1 and Layer 2 codecs of the same family.
MPEG System
This figure shows the basic operation of an MPEG system. This diagram shows that the MPEG system allow multiple media types to be used (voice, audio and data), codes and compresses each media type, adds timing information and combines (multiplexes) the media channels into a MPEG program stream. This example shows that multiple program streams (e.g. television programs) can be combined into a transport channel. When the MPEG signal is received, the program channels are separated (demultiplexed), individual media channels are decoded and decompressed and they are converted back into their original media form.
MPEG Books
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Introduction to MPEG Book
This book explains the basics of audio and video digitization and compression and the standard formats that are used be MPEG. You will learn about the different MPEG audio coders and video coder options. $19.99 Printed, $16.99 eBook |
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