INVERSE FILTERING METHOD, SYNTHESIS FILTERING METHOD, INVERSE FILTER DEVICE, SYNTHESIS FILTER DEVICE AND DEVICES COMPRISING SUCH FILTER DEVICES

摘要

ABSTRACT IN/PCT/2002/02175/CHE "INVERSE FILTERING METHOD, SYNTHESIS FILTERING METHOD, INVERSE FILTER DEVICE, SYNTHESIS FILTER DEVICE AND DEVICES COMPRISING SUCH FILTER DEVICES" An inverse filtering method, at least comprising generating (1-VI) a first filtered signal sample based on an input signal sample; and combining (VII) said first filtered signal with said input signal sample for obtaining a residual signal sample, wherein said generating (I-VI) the first filtered signal sample comprises: obtaining at least one filtered and amplified signal, said obtaining comprising generating (III-V) at least one second filtered signal sample, said generating being stable, causal and not consisting of a delay; amplifying with an amplification factor, which amplification factor is at least time or signal dependent; characterized in that the said generating (I-VI) comprises storing (I) first signal samples related to said input signal in a buffer; retrieving (II) from said buffer delayed signal samples, wherein the first filtered signal sample is obtained by performing delaying with said storing and retrieving, generating of the at least one second filtered signal and amplifying in series with one another.