Signal processor that uses a delta-sigma modulation

A signal processing system for processing an input analog signal, comprising:

• delta-sigma modulation means supplied with said input analog signal for applying thereon a delta-sigma modulation, said delta-sigma modulation means producing one-bit data sequentially in response to said input analog signal;
• arithmetic means supplied with said output one-bit data of said delta-sigma modulation means for applying a predetermined arithmetic operation thereon;
• integration means supplied with an output of said arithmetic means for integrating the same to produce multiple-bit data as an output;
• comparator means having first and second input ports, said comparator means being supplied with said multiple-bit data from said integration means at said first input port and multiple-bit reference data at said second input port for producing one-bit data as a result of comparison of the multiple-bit data at said first input port and said reference data at said second input port;
• feedback means supplied with an output of said comparator means for producing said multiple-bit reference data based upon said one-bit data produced by said comparator means such that said reference data predicts said multiple-bit data supplied to said first input port, said feedback means supplying said multiple-bit reference data to said second input port of said comparator means;
• and
• digital-to-analog conversion means supplied with said output one-bit data of said comparator means for converting the same to an analog output signal.