MP3 makes use of lossy data compression to encode data using inaccurate approximations and partial discarding of data. This can greatly reduce the file size compared to uncompressed audio. The MP3 encoding algorithm is usually divided into four parts.Part 1 divides the audio signal into smaller parts, called frames, and then performs a modified discrete cosine transform (MDCT) filter on the output.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.
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