发明名称 |
FREQUENCY ANALYSIS METHOD AND APPARATUS, AND SPECTRUM SPREAD DEMODULATION METHOD AND APPARATUS |
摘要 |
<p>A method for performing frequency analysis by executing discrete Fourier transform with a smaller capacity of a memory than in usual FFT processing, without reducing the frequency resolution. A-power-of-two N<SUB>A</SUB>=2<SUP>a </SUP>(where "a" is an integer) memories for discrete Fourier transform are prepared. A former-stage calculation step of taking out frequency components of an input signal having a-power-of-two N<SUB>B</SUB>=2<SUP>b </SUP>(where "b" is an integer and b>a) data items, in a comb manner and of calculating N<SUB>A </SUB>intermediate data items and a latter-stage calculation step of applying fast Fourier transform to the intermediate data items obtained in the former-stage calculation step, by using the N<SUB>A </SUB>memories for discrete Fourier transform are executed 2<SUP>b-a </SUP>times with the frequency components taken out in the comb manner being changed, to execute discrete Fourier transform through 2<SUP>b-a </SUP>operations.</p> |
申请公布号 |
EP1403776(A4) |
申请公布日期 |
2014.01.22 |
申请号 |
EP20020745840 |
申请日期 |
2002.07.04 |
申请人 |
SONY CORPORATION |
发明人 |
TANAKA, KATSUYUKI;NITTA, MANABU |
分类号 |
G06F17/14;G01R23/16;G01S19/29;G01S19/30;G01S19/37;H04B1/69 |
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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