Part 4 formats the bitstream (called an audio frame), which consists of four parts: header, error check, audio data, and ancillary data.Part 3 quantifies and encodes each sample (called noise allocation), and the sample will adjust itself to meet the bit rate and sound masking requirements.Part 2 passes the samples to a 1024-point Fast Fourier Transform (FFT), then applies the psychoacoustic model, and performs another MDCT filter on the output.Part 1 divides the audio signal into smaller parts, called frames, and then performs a modified discrete cosine transform (MDCT) filter on the output.The MP3 encoding algorithm is usually divided into four parts. This can greatly reduce the file size compared to uncompressed audio. MP3 makes use of lossy data compression to encode data using inaccurate approximations and partial discarding of data. MP3 as a file format usually specifies a file containing an elementary stream of MPEG-1 Audio or MPEG-2 Audio encoded data without the other complexity of the MP3 standard. To begin with, what is MP3? It formally represents MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) and it is a coding format for digital audio.
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