MPEG-1 Layer 1 - significado y definición. Qué es MPEG-1 Layer 1
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Qué (quién) es MPEG-1 Layer 1 - definición

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

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)
MPEG-1 layer 3         
OPEN STANDARD LOSSY COMPRESSION FORMAT FOR DIGITAL AUDIO
Data compression/MP3; Mp3; .mp3; MPEG Layer III; Mp3 files; MPEG-1 Audio Layer 3; Mp3s; MP3 audio; MP3 Audio; MP3 sound; MP3 Sound; MP3 Track; MP3 track; MP3 music; MP3 Music; MPEG Audio Layer 3; Mp3 download; MPEG-1 Audio Layer III; MP3 Downloader; MPEG-1 Layer III; MPEG-1 Layer 3; MP3G; Mp3 encoder; .MP3; MP3 (file format); PXFM; MP 3; MP3 file; MP£; MPEG-2 Audio Layer III; MPEG-2 Layer III; MPEG 1 Audio, Layer 3; MPEG-2 Audio Layer 3; MP3 download; Motion Picture Experts Group Audio Layer 3; MP3 encoding; Audio/mpeg; .mp3 file
MPEG-1 audio layer 3         
OPEN STANDARD LOSSY COMPRESSION FORMAT FOR DIGITAL AUDIO
Data compression/MP3; Mp3; .mp3; MPEG Layer III; Mp3 files; MPEG-1 Audio Layer 3; Mp3s; MP3 audio; MP3 Audio; MP3 sound; MP3 Sound; MP3 Track; MP3 track; MP3 music; MP3 Music; MPEG Audio Layer 3; Mp3 download; MPEG-1 Audio Layer III; MP3 Downloader; MPEG-1 Layer III; MPEG-1 Layer 3; MP3G; Mp3 encoder; .MP3; MP3 (file format); PXFM; MP 3; MP3 file; MP£; MPEG-2 Audio Layer III; MPEG-2 Layer III; MPEG 1 Audio, Layer 3; MPEG-2 Audio Layer 3; MP3 download; Motion Picture Experts Group Audio Layer 3; MP3 encoding; Audio/mpeg; .mp3 file
<music, file format> (MP3) A digital audio {compression algorithm} that acheives a compression factor of about twelve while preserving sound quality. It does this by optimising the compression according to the range of sound that people can actually hear. MP3 is currently (July 1999) the most powerful algorithm in a series of audio encoding standards developed under the sponsorship of the {Moving Picture Experts Group} (MPEG) and formalised by the International Organization for Standardization (ISO). MP3 is very different from Layer 2, using an additional MDCT layer to increase frequency resolution. Its scale factor groups are more optimised for the human ear, and it uses nonlinear sample quantisation and Huffman coding. MP3 files (filename extension ".mp3") can be downloaded from many World-Wide Web sites and can be played using software available for most operating systems (also downloadable), e.g. Winamp for PC, MacAmp for Macintosh, and mpeg123 for Unix. MP3 files are usually downloaded completely before playing but streaming MP3 is also possible. A program called a "ripper" can be used to copy a selection from a music CD onto your hard disk and another program called an encoder can convert it to an MP3 file. (2001-12-04)

Wikipedia

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.