Device for encoding and decoding transmission signals through adaptive selection of transforming methods

摘要

A device is provided for encoding and decoding transmitted signals through adaptive selection of different transform methods. An original signal or a predicted error signal having at least one dimension is input in parallel to a plurality of different transforms. The total energy level of coefficients, corresponding to low frequency components, from each transform is measured and compared. The output of the transform having the largest energy, is selected and encoded for transmission, and thereafter the transmission signal is decoded. The device maximizes encoding and decoding efficiencies.