MP3 audio format history and technical origins

The MP3 format, officially known as ISO MPEG Audio Layer 3, originated from research conducted by Karlheinz Brandenburg at the University of Erlangen–Nuremberg. The technology was developed to balance high-quality sound transmission with small file sizes through a process called auditory masking.

As part of the MPEG-1 standard, the audio section was divided into three distinct layers rather than successive versions. Layer III, which became the basis for the MP3, offered the most sophisticated compression by achieving high quality at low bitrates, though it required more processing power.

The name MP3 is derived from MPEG-1 Audio Layer III. While the extension .bit was used initially, the name .mp3 was officially adopted on July 14, 1995, following an internal vote. Although a project named MPEG-3 was proposed for high-definition television, its features were integrated into MPEG-2, causing the MPEG standard to skip from MPEG-2 to MPEG-4 while the MP3 format continued independently.