Signal processors

A signal processor according to claim 6, wherein the Delta-Sigma Modulator of the means coupled to the stages for reducing comprises: a first input for receiving odd samples of the 1-bit signal; a second input for receiving even samples of the 1-bit signal; a linear signal processing section for combining the odd and even samples of the 1-bit signal to produce a p-bit signal; a filter for filtering the p-bit signal; a noise shaping section which feeds a processed 1-bit signal back to an adder at the output of the filter for summation with said p-bit signal; and a quantizer which converts the summed signal to the processed 1-bit signal, the processed 1-bit signal being the output signal of the Delta-Sigma Modulator.

A signal processor according to claim 6, wherein the Delta Signa Modulator of the means coupled to the stages for reducing comprises an nth order Delta Sigma Modulator (DSM) having: a first input for receiving odd signal samples; a second input for receiving even signal samples; a quantizer for requantizing a p-bit signal to 1-bit form the requantized signal being the output signal of the processor; a plurality of signal combiners including a first combiner for forming an integral of an additive combination of the product of the odd samples and a first coefficient and of the product of the even samples and a second coefficient and of the product of the output signal and a third coefficient, at least two intermediate combiners for forming an integral of an additive combination of the product of the odd samples and the first coefficient and of the product of the even samples and the second coefficient and of the product of the output signal and the third coefficient and of the integral of the preceding stage; and a final combiner for forming an additive combination of the product of the odd samples and the first coefficient and of the product of the even samples and the second coefficient and of the integral of the preceding stage to form the said p-bit signal which is requantized by the quantizer.