发明名称 |
DEVICE AND METHOD FOR FAST FOURIER TRANSFORM OPERATION, AND DEVICE AND METHOD FOR REVERSE FAST FOURIER TRANSFORM OPERATION |
摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fast Fourier transform operation device which can shorten an arithmetic processing time by reducing the quantity of the arithmetic processing for complex multiplication. <P>SOLUTION: The fast Fourier transform operation device is equipped with a discrete Fourier transform means which has two inputs and performs fast Fourier transform with N inputs (N: power of 2) by using the discrete Fourier transform means. The discrete Fourier transform means is equipped with a sign inverting means which inverts the sign of an input value and outputs the resultant value, and finds a complex multiplication value as to a rotational factor corresponding to a unit vector on the real axis and a rotational factor corresponding to a unit vector on the imaginary axis among the complex products of complex input values and rotational factors by using the value of the real part of imaginary part of a complex input value and the sign- inverted value of the real part or imaginary part. <P>COPYRIGHT: (C)2004,JPO</p> |
申请公布号 |
JP2003296300(A) |
申请公布日期 |
2003.10.17 |
申请号 |
JP20020104051 |
申请日期 |
2002.04.05 |
申请人 |
KDDI CORP |
发明人 |
KUNISAWA YOSHIO;OZEKI TAKEO;ISHIKAWA HIROYASU;SHINONAGA HIDEYUKI |
分类号 |
G06F17/14;(IPC1-7):G06F17/14 |
主分类号 |
G06F17/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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