An apparatus for orthogonal transform coding

摘要

An orthogonal transform coding device assembles sample values of the input signals and forms a large block. The large block is divided into a plurality of small blocks and the sample values are subjected to the orthogonal transform coding for every small blocks. There are provided a plurality of quantizers for the orthogonal transformed components and the data amount after coding when the quantization is performed by the respective quantizers is setimated, whereby the optimum quantizers are selected for the respective small blocks according to the estimated value.