초록 ▼

A noise shaping circuit includes a first degree noise shaping arrangement in which a quantization error component at a first quantizer adapted for quantizing input signals is fed back to an input side, and in which a quantization error component at the first quantizer is fed back by a predetermined

A noise shaping circuit includes a first degree noise shaping arrangement in which a quantization error component at a first quantizer adapted for quantizing input signals is fed back to an input side, and in which a quantization error component at the first quantizer is fed back by a predetermined feedback circuit to an input of the first quantizer. The feedback circuit includes a synthesizing unit supplied with an error signal from a first quantization error output unit, a second quantizer for quantizing an output signal from the synthesizing unit, a second quantization error output unit for taking out a quantization error at the second quantizer, a transfer characteristic unit having predetermined transfer characteristics, and a differentiation unit supplied with output signals from the second quantizer. Error signals from the second quantization error output unit are supplied to the transfer characteristic unit, the output of which is supplied to the synthesizing unit.

대표청구항 ▼

A noise shaping apparatus for producing M-bit output digital data by requantizing N-bit input digital data, the noise shaping apparatus comprising: a first quantizer for quantizing said input digital data, a first feedback circuit for feeding back a quantization error component of said first quantiz

A noise shaping apparatus for producing M-bit output digital data by requantizing N-bit input digital data, the noise shaping apparatus comprising: a first quantizer for quantizing said input digital data, a first feedback circuit for feeding back a quantization error component of said first quantizer to an input side of said first quantizer for constituting a first degree noise shaping circuit, and a second feedback circuit for feeding back a quantization error component of said first quantizer to an input side of said first quantizer, said second feedback circuit comprising synthesizing means to which quantization error signals from said first quantizer are supplied, a second quantizer for quantizing output signals from said synthesizing means, transfer characteristic means for applying predetermined transfer characteristics to quantization errors of said second quantizer, an output of said transfer characteristic means being supplied to said synthesizing means, and differentiation means for differentiating an output of said second quantizer for supplying a differentiated output to an input side of said first quantizer.