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The diagram shows three rectangles depicting a block diagram of an MP3 encoder. There are two rectangles side by side at the top of the diagram. The rectangle on the left is labelled ‘32 critical frequency filter bank’. The rectangle on the right is labelled ‘allocate number of bits’, and above this rectangle is the label ‘VBR coder’.

The third rectangle is below and between the two upper rectangles. It is labelled ‘compute masking levels’. Beneath this rectangle there is also the label ‘psychoacoustic model’.

The inputs to the MP3 encoder are shown as a blue arrow that enters from the left and splits to point at the two rectangles labelled ‘32 critical frequency filter bank’ and ‘compute masking levels’.

The output of the ’32 critical frequency filter bank’ rectangle is shown as another blue arrow that splits to point at the two rectangles labelled ‘compute masking levels’ and ‘allocate number of bits’.

The output of the ‘compute masking levels’ rectangle is shown as another blue arrow that points at the ‘allocate number of bits’ rectangle.

Finally, the output of the ‘allocate number of bits’ rectangle is shown as a blue arrow pointing to the right. This is labelled ‘MP3 bitstream’.

 3.5 MPEG audio layer 3 (MP3)