Patent ID: 7266152

Claim:
A digital signal processing device to which, after digital signals are subjected to predetermined processing, a processed digital signal having signal amplitude values exceeding signal amplitude values of said digital signals is inputted, said digital signal processing device comprising: first delta sigma modulating means including first quantizing means having quantized amplitude values for allowing at least quantization of signal amplitude of said inputted processed digital signal; and second delta sigma modulating means including second quantizing means having quantized amplitude values equal to the signal amplitude values of said digital signals for quantizing a modulated signal output from said first delta sigma modulating means, wherein said first quantizing means of said first delta sigma modulating means is operable to perform quantization with quantized values, each comprising n bits (n is 2 or more), and to use two values having a zero interposed between the two values and separated from the two values by equal quantities and values having a difference equal to a difference between the two values as the quantized values, and wherein said second quantizing means of said second delta sigma modulating means is operable to use values equal to two least significant quantized values of the quantized values of said first quantizing means as quantized values.