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~yao Yao Wang Audio Coding - New York University
https://eeweb.engineering.nyu.edu/~yao/EE3414/audio_coding.pdf
©Yao Wang, 2004 EE3414: Audio Coding 18 Basic Steps in MPEG-1 Audio Coding 1. Use convolution filters to divide the audio signal into 32 frequency subbands --> sub-band filtering. 2. Determine amount of masking for each band based on its frequency (threshold-in-quiet), and the energy of its neighboring band in frequency and time
MPEG Audio Coding
https://cs.haifa.ac.il/~nimrod/Compression/Speech/A1mpeg12-2004.pdf
• MPEG-1: 1.5 Mbits/sec for audio and video: ~1.1Mbps for video, 0.3-0.4Mbps for audio • Uncompressed CD audio is 44,100 samples/sec * 16 bits/sample * 2 channels > 1.4Mbps • Typical Compression factors: from 2.7 to 24 • With Compression rate 6:1 (16 bits stereo sampled at 48 KHz is reduced to 256 kbps) and
MPEG Basics | MPEG
https://mpeg.chiariglione.org/mpeg-basics
The Moving Picture Coding Experts Group (MPEG) was established in January 1988 with the mandate to develop standards for coded representation of moving pictures, audio and their combination. It operates in the framework of the Joint ISO/IEC Technical Committee (JTC 1) on Information Technology and is formally Working Group 11 (WG11) of Subcommittee 29 (SC29) …
MPEG-1 and MPEG-2 Layer II Audio Encoding - loc.gov
https://www.loc.gov/preservation/digital/formats/fdd/fdd000338.shtml
MPEG-1, MPEG-1 Video Coding (H.261) Subtype of: MPEG-2_family, MPEG-2 Encoding Family: Used by: MPEG-2_422_layer_2, MPEG-2 File with 422 Video and Layer II Audio Encoding: Used by: MPEG-2_MP_layer_2, MPEG-2 File with Main Profile Video and Layer II …
MP3 (MPEG Layer III Audio Encoding) - Library of Congress
https://www.loc.gov/preservation/digital/formats/fdd/fdd000012.shtml
MP3 (MPEG Layer III Audio Encoding) Format Description Categories >> Browse Alphabetical List MP3 (MPEG Layer III Audio Encoding) >> Back Table of Contents Identification and description Local use Sustainability factors Quality and functionality factors File type signifiers Notes Format specifications Useful references Format Description Properties
MPEG/Audio Compression - SlideShare
https://www.slideshare.net/BrewsterXO/mpegaudio-compression
Polyphase Filter Bank Divides audio signal into 32 equal width subband streams in the frequency domain. Inverse filter at decoder cannot recover signal without some, albeit inaudible, loss. Based on work by Rothweiler [2]. Standard specifies 512 coefficient analysis window, C [n] 11.
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