The invention concerns a sigma-delta modulator system with two cascade-connected modulators. The quantizing error of the first modulator and an error signal e representing integrated signal estimate error are taken to the second modulator for quantizing, the quantized error signal is derived and subtracted suitably from the delayed output signal of the first modulator. To reduce the noise the quantizing in the second modulator is a negative reconnection of the output power from at least one integration stage 42 to the input of a preceding integration stage 41, and the reconnection loop has at least one delay. <IMAGE>
