A third version, known as MPEG 2.5 - extended to better support lower bit rates - is commonly implemented, but is not a recognized standard. Originally defined as the third audio format of the MPEG-1 standard, it was retained and further extended - defining additional bit-rates and support for more audio channels - as the third audio format of the subsequent MPEG-2 standard. MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio developed largely by the Fraunhofer Society in Germany under the lead of Karlheinz Brandenburg, with support from other digital scientists in the United States and elsewhere.
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