Discrete Cosine Transform (DCT)

The DCT is a transform that converts a signal into its constituent frequency components. The DCT core is used for Video coding systems based on the baseline JPEG and performs 8x8 two-dimensional forward Discrete Cosine Transform.

The data input into the core is a block of 8x8 samples. The two-stage process performs the transform as two separate one-dimensional transforms.

This results in a set of intermediate results being produced, which require storage and further processing. There is a latency of 76 clock cycles before which the first output sample appears at the output.

Consequently, there is a similar latency of 76 clock cycles between the last input data and the last output data.

Features

• Fully synchronous with asynchronous reset and without internal tri-state buffers
• DCT input precision 8 bits; output precision 12 bits
• High clock speed and low gate count
• Internal block Ram used
• Input scanning format: row-by row
• Latency of 76 clock cycles
• Suitable for JPEG
• Test benches & reference modules available