| 摘要 |
<p>A noise shaping circuit permitting a wide dynamic range for input signal and having an improved S/N ratio. In Fig. 1, the circuit comprises a delay part 3 for delaying the output signal for a one-sampling period; a first subtraction part 1 for subtracting the delayed signal, via the delay part 3 from the input signal imparted to the input terminal so as to generate first subtraction results; a first integration part 2 for integrating the first subtraction results; a second subtraction part 4 for subtracting the input signal from the first integrated value of the part 2; a second integration part 5 for integrating the second subtraction value so as to obtain a second integrated value; an addition part 7 for adding the first and second integrated values so as to obtain an addition results, and a quantizer 6 for quantizing the addition results. The amplitude of the signal imparted to the part 5 is minimized by means of the part 4, so that the dynamic range of the part 5 is utilized with high efficiency. <IMAGE></p> |
