Patent ID: 8125363
Filing Date: 2012-02-28
Classification: H03M

Abstract:
1. A digital signal processing device comprising: a signal output section outputting a frequency signal by a digital signal made of bit data; an addition section adding noise data to the bit data from the signal output section to suppress occurrence of an unnecessary frequency component; and a bit number reduction processing section performing number reduction to the bit data obtained by said addition section by pre-processing the obtained bit data and cutting off an m-bit portion after the pre-processing: wherein when the obtained bit data has a negative value, the pre-processing includes subtracting a value “1” from the obtained bit data; wherein when the obtained bit data has a positive value, the pre-processing leaves the obtained bit data “as is”; and wherein the pre-processed obtained bit data undergoes shifting to the right by m digits set in advance to cut-off the m-bit portion where m is an integer less than a number of bits of the obtained bit data, and then undergoes fraction processing to adjust a least significant bit according to either one of rounding down “0” or rounding up “1” of a most significant bit of the bits having been cut off.