Boots – shoes – and leggings
Patent
1978-12-21
1980-10-28
Smith, Jerry
Boots, shoes, and leggings
364730, G06F 15332
Patent
active
042311020
ABSTRACT:
An apparatus for performing a Fourier transform using Cordic techniques. Digital words are pipelined through serial add/subtract stages to provide vector rotations without trignometric lookup tables or multiply operations. The throughput of an FFT butterfly calculation is increased over prior art digital processors. A plurality of apparatus may be pipelined in a system to further increase the throughput rate. Also, the apparatus may be programmed to perform vector rotations through a plurality of angles thus providing the capability to compute FFT's of varying numbers of points.
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patent: 3927312 (1975-12-01), Dickinson
patent: 4075630 (1978-02-01), Shapiro et al.
J. E. Volder, "The Cordic Trigonometric Computing Technique", IEEE Trans. on Elect. Computers, vol. EC-B, Sep. 1959, pp. 330-334.
A. M. Despain, "Fourier Transform Computers Using Cordic Iterations", IEEE Trans. on Computers, vol. C-23, No. 10, Oct. 1974, pp. 993-1001.
H. L. Groginsky et al., "A Pipeline Fast Fourier Transform", IEEE Trans. on Computers, vol. C-19, No. 11, Nov. 1970, pp. 1015-1019.
Barr Paul C.
Groginsky Herbert L.
Bartlett Milton D.
Clark William R.
Pannone Joseph D.
Raytheon Company
Smith Jerry
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