| 摘要 |
<p>A fast Fourier transform circuit equipped with a first and a second butterfly circuit that perform butterfly calculations corresponding to mutually different calculation bit lengths, and equipped with a control means that selectively controls the operation of the first and second butterfly circuits in accordance with any of multiple operation modes, including a first operation mode wherein a calculation is performed with both the first and the second butterfly circuit, and a second operation mode wherein a calculation is performed with only the first or only the second butterfly circuit.</p> |
