MPEG-1 Layer 2 - определение. Что такое MPEG-1 Layer 2
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Что (кто) такое MPEG-1 Layer 2 - определение

AUDIO FORMATS
MPEG-1 Audio Layer 1; MP1; .mp1

MPEG-1         
  • ASPEC 91 in the [[Deutsches Museum Bonn]], with encoder (below) and decoder
  • Example FFT analysis on an audio wave sample.
  • Example of 4:2:0 subsampling. The two overlapping center circles represent chroma blue and chroma red (color) pixels, while the 4 outside circles represent the luma (brightness).
STANDARD FOR COMPRESSION OF VIDEO AND AUDIO
MPEG1; Mpeg-1; Mpeg 1; MPEG 1; D-frame; ASPEC; ISO/IEC 11172-3; .mpeg; Mpeg1; MPEG-1 Part 2; ISO/IEC 11172; D frame
<compression, standard, algorithm, file format> The first MPEG format for compressed video, optimised for CD-ROM. MPEG-1 was designed for the transmission rates of about 1.5 Mbps achievable with Video-CD and CD-i. It uses discrete cosine transform (DCT) and Huffman coding to remove spatially redundant data within a frame and block-based motion compensated prediction (MCP) to remove data which is temporally redundant between frames. Audio is compressed using subband encoding. These algorithms allow better than VHS quality video and almost CD quality audio to be compressed onto and streamed off a single speed (1x) CD-ROM drive. MPEG encoding can introduce blockiness, colour bleed and shimmering effects on video and lack of detail and quantisation effects on audio. The official name of MPEG-1 is International Standard IS-11172. (1999-01-06)
ASPEC         
  • ASPEC 91 in the [[Deutsches Museum Bonn]], with encoder (below) and decoder
  • Example FFT analysis on an audio wave sample.
  • Example of 4:2:0 subsampling. The two overlapping center circles represent chroma blue and chroma red (color) pixels, while the 4 outside circles represent the luma (brightness).
STANDARD FOR COMPRESSION OF VIDEO AND AUDIO
MPEG1; Mpeg-1; Mpeg 1; MPEG 1; D-frame; ASPEC; ISO/IEC 11172-3; .mpeg; Mpeg1; MPEG-1 Part 2; ISO/IEC 11172; D frame
Advanced SPectre Entropy Coding (Reference: MPEG, Digital audio)
MPEG-1 audio layer 1         
<audio, compression, algorithm> (MP1) A simple 32-subband audio compressor using a floating point representation for subband samples. Resolution and scale factor are stored for groups of 12 subsamples. MP1 is only used for Philips DCC Digital Compact cassette with data rates of 384 kbps. (2001-12-02)

Википедия

MPEG-1 Audio Layer I

MPEG-1 Audio Layer I, commonly abbreviated to MP1, is one of three audio formats included in the MPEG-1 standard. It is a deliberately simplified version of MPEG-1 Audio Layer II (MP2), created for applications where lower compression efficiency could be tolerated in return for a less complex algorithm that could be executed with simpler hardware requirements. While supported by most media players, the codec is considered largely obsolete, and replaced by MP2 or MP3.

For files only containing MP1 audio, the file extension .mp1 is used.

A limited version of MPEG-1 layer I was also used by the Digital Compact Cassette format, in the form of the PASC (Precision Adaptive Subband Coding) audio compression codec. The bit rate of PASC was fixed at 384 kilobits per second, and when encoding audio at a sample frequency of 44.1 kHz, PASC regards the padding slots as 'dummy' and sets them to zero, whereas the ISO/IEC 11172-3 standard uses them to store data.