| 摘要 |
<p>The present invention refers to a system for calculating the DCT of dimension M*M with the property of being orthogonal and separable under the form of two monodimensional transforms calculated by a fast algorithm, by operating on incoming and outgoing words, that are disposed in the form of parallel bits, and by operating onto the data internal to the system onto words represented by means of 2 Mbits. According to a feature of the invention, the operations of summation and subtraction between variable data and the operations of multiplying by the variable data using fixed coefficients are made onto the data represented in the form of M couples of serialized bits, so that the speed of the incoming and outgoing words, in the form of words by parallel bits, is equal to the speed of bit couples that represent the internal data. A circuit implemented onto silicon basis for the fulfilment of this system includes at least: - an input interface - a converter for incoming words for the conversion from the form of parallel bits to the form of words represented by means of serial bit couples for the incoming words and viceversa for the outgoing words - a first operator for the DCT monodimensional transform - a transpositor from lines to columns. - a second operator for monodimensional transform - a scaling device for outgoing words.</p> |
