Nyquist response restoring delta-sigma modulator based analog to digital and digital to analog conversion

A delta-sigma modulator based converter apparatus, comprising:

• a first low pass modulator set, comprising;
• a first signal transducer, comprising a first signal transducer input and a first signal transducer output,
• a first delta-sigma modulator structure, comprising a first delta-sigma modulator structure input and a first delta-sigma modulator structure output, said first delta-sigma modulator structure output coupled with said first signal transducer input,
• a first inverse signal transducer, comprising a first inverse signal transducer input and a first inverse signal transducer output, said first inverse signal transducer input coupled with said first signal transducer output, said first inverse signal transducer output coupled with said first delta-sigma modulator structure, wherein said first inverse signal transducer is part of a feedback loop coupling output from said first signal transducer back to said first delta-sigma modulator structure, and
• a first noise signal generation component, comprising a first noise signal generation component first input, a first noise signal generation component second input, and a first noise signal generation component output, said first noise signal generation component first input coupled with said first inverse signal transducer output, said first noise signal generation component second input coupled with said first delta-sigma modulator structure output, wherein signals received via said first noise signal generation component first input are subtracted from signals received via said first noise signal generation component second input and resultant signals are transmitted via said first noise signal generation component output;
• a first scaling component, comprising a first scaling component input and a first scaling component output, said first scaling component input coupled with said first noise signal generation component output;
• and
• a high pass modulator set, comprising;
• a second signal transducer, comprising a second signal transducer input and a second signal transducer output,
• a second delta-sigma modulator structure, comprising a second delta-sigma modulator structure input and a second delta-sigma modulator structure output, said second delta-sigma modulator structure input coupled with said first scaling component output, and said second delta-sigma modulator structure output coupled with said second signal transducer input, and
• a second inverse signal transducer, comprising a second inverse signal transducer input and a second inverse signal transducer output, said second inverse signal transducer input coupled with said second signal transducer output, said second inverse signal transducer output coupled with said second delta-sigma modulator structure, wherein said second inverse signal transducer is part of a feedback loop coupling output from said second signal transducer back to said second delta-sigma modulator structure.

A method for processing an analog signal and outputting a digital signal, comprising the steps of:

• inputting an analog signal into a differentiator component of a high pass modulator set;
• processing the analog signal by passing it through at least one differentiator component followed by a summer component;
• transferring the processed analog signal from said summer component to a signal transducer;
• converting the processed analog signal into a transducer processed digital signal;
• re-converting the transducer processed digital signal to an analog feedback signal;
• feeding the analog feedback signal back to the summer component;
• and
• outputting the transducer processed digital signal from the high pass modulator set.

A signal converter apparatus, comprising:

• first low pass modulator set means for filtering an input signal and outputting a first noise signal and a first data signal;
• first scaling component means for scaling the first noise signal and outputting a scaled first noise signal;
• and
• high pass modulator set means for filtering the scaled first noise signal and outputting a second noise signal and a second data signal.