.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.
Specification
MPEG-1 Layer I is defined in ISO/IEC 11172-3, which first version was published in 1993. * Sampling rates: 32, 44.1 and 48 kHz * Bitrates: 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416 and 448 kbit/s An extension has been provided in MPEG-2 Layer I and is defined in ISO/IEC 13818-3, which first version was published in 1995. * Additional sampling rates: 16, 22.05 and 24 kHz * Additional bitrates: 48, 56, 80, 112, 144 and 176 kbit/s MP1 uses a comparatively simpleLicensing
Sisvel S.p.A., a Luxembourg-based company, administers licenses for patents applying to MPEG Audio. As MPEG-1 is well over 20 years old, all MPEG-1 patents have expired, therefore open source encoders and decoders can be distributed without paying licensing fees.References
External links
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