AET 2050 - DAW Production



3. Lossy File Coding Formats

 

Objectives:


SOME LOSSY CODING SYSTEMS

MPEG

The Moving Pictures Expert Group formed in 1988 to devise compression techniques for audio and video.

there have been 2 standards produced. The standards define three "layers" of coding, each with different applications.

MPEG-1

The standard was completed in 1992.

Specifically developed to support audio and video coding for playback within the CD's bandwidth of 1.41 Mbps.

Supports encoding of 32, 44.1, or 48 kHz at rates of 64 - 448 kbps for stereo channels.

Rates < 256k are used when full screen motion quality is critical; rates > 256k are used for higher audio quality but partial video images.

MPEG-1 Layer 3 (MP3)

MPEG-2

MPEG-4 / Advanced Audio Coding (MP4, AAC)

Dolby Digital AC-3

DTS

In-depth articles:

Compatibility: