A filter comprising a charge-coupled device having a first group of cells weighted according to a recurring filter law and having a second group of cells weighted according to a non recurring filter law. The cells of the first and second groups are interposed alternately and the displacement of the charges under these cells is carried at frequency twice that of the sampling rate of the input signal. Thus the effects of transfer inefficiency are suppressed without added hardware.
The invention relates to filters using a charge-transfer device as an active element it consists in providing such a filter with an output circuit of first order interpolator type; this circuit may be external to the charge-transfer device or partially integrated threwith by associating therewith an additional weighting cell and by using another set of weighting coefficients.
