Method and arrangement for transformation of signals from a frequency to a time domain

摘要

A system for transforming digital signals from a frequency to a time representation, in which the digital signals are arranged in groups of N data input words, comprising : means for forcing predetermined bits of selected internal data words in the system to predetermined binary values, whereby the statistical accuracy of the system is improved relative to a predetermined test input data set, pre-common processing means (PREC) arranged to perform predetermined pairing operations on odd-numbered ones of the input words and to transmit even-numbered ones of the input words to pre-common outputs ; and post-common processing means (POSTC) arranged to perform predetermined output scaling operations on the odd common processing means output values to form post-processed odd values and to arithmetically combine the post-processed odd values with the even common processing means output values to generate high- and low-order output words. The system is arranged such that the output words contain inverse discrete cosine transformation values corresponding to the input data words. <IMAGE>