MPEG-4 The Moving Picture Expert Group

MPEG-4 The Moving Picture Expert Group

ABSTRACT

MPEG-4 (ISO14496) is an ISO/IEC standard developed by MPEG (Moving  Picture Experts Group). The first version of the MPEG-4 standard was finalized in October  ‘98 and became an international standard at the beginning of 1999.  Although defined as one standard, MPEG-4 is actually a set of compression/decompression formats and streaming
technologies that address the need for distributing rich interactive media over narrow and broadband networks.

The audio and video data are integral part of any application. The basic format of audio file is “.wav”. Other formats of audio file are .wma, .mp3 etc. The .wav file is of 16 bit that means for each pixel or frame 16 bits are allocated, so by means of these we are able to store only 10-12 audio files in a CD.

 In the due course of time, there aroused a need of a format which could compress the files. But there are many constraints in compressing audio data. MPEG-4(Moving Picture Expert Group) is the solution to this problem, that keeps the quality of audio file unaffected. MPEG-4 Audio provides tools for coding of both natural and synthetic audio objects. It permits to represent natural sounds (such as speech and music) and to synthesize sounds based on structured descriptions.

The representation for synthesized sound can be derived from text data or so-called instrument descriptions and by coding parameters to provide effects, such as reverberation and spatialization. The representations provide compression and other functionalities, such as scalability or play-back at different speeds.

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