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Class Information
Number: 708/409
Name: Electrical computers: arithmetic processing and calculating > Electrical digital calculating computer > Particular function performed > Transform > Fourier > Butterfly circuit
Description: Subject matter wherein a specific apparatus performs a complex multiplication and a complex addition or subtraction.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7555511 |
Methods for addressing input data values of a Fast Fourier Transform (FFT) calculation |
Jun. 30, 2009 |
| 7555512 |
RAM-based fast fourier transform unit for wireless communications |
Jun. 30, 2009 |
| 7555514 |
Packed add-subtract operation in a microprocessor |
Jun. 30, 2009 |
| 7543010 |
Modular pipeline fast Fourier transform |
Jun. 2, 2009 |
| 7529789 |
Method for representing complex numbers in a communication system |
May. 5, 2009 |
| 7496618 |
System and method for a fast fourier transform architecture in a multicarrier transceiver |
Feb. 24, 2009 |
| 7487193 |
Fast video codec transform implementations |
Feb. 3, 2009 |
| 7454452 |
Fast fourier transform operation with reduced cache penalty |
Nov. 18, 2008 |
| 7428564 |
Pipelined FFT processor with memory address interleaving |
Sep. 23, 2008 |
| 7391632 |
Apparatus of selectively performing fast hadamard transform and fast fourier transform, and CCK modulation and demodulation apparatus using the same |
Jun. 24, 2008 |
| 7197095 |
Inverse fast fourier transform (IFFT) with overlap and add |
Mar. 27, 2007 |
| 7197525 |
Method and system for fixed point fast fourier transform with improved SNR |
Mar. 27, 2007 |
| 7164723 |
Modulation apparatus using mixed-radix fast fourier transform |
Jan. 16, 2007 |
| 7024442 |
Processing apparatus |
Apr. 4, 2006 |
| 7010558 |
Data processor with enhanced instruction execution and method |
Mar. 7, 2006 |
| 6792441 |
Parallel multiprocessing for the fast fourier transform with pipeline architecture |
Sep. 14, 2004 |
| 6751643 |
Butterfly-processing element for efficient fast fourier transform method and apparatus |
Jun. 15, 2004 |
| 6721708 |
Power saving apparatus and method for AC-3 codec by reducing operations |
Apr. 13, 2004 |
| 6438568 |
Method and apparatus for optimizing conversion of input data to output data |
Aug. 20, 2002 |
| 6434583 |
Fast fourier transform apparatus and method |
Aug. 13, 2002 |
| 6421696 |
System and method for high speed execution of Fast Fourier Transforms utilizing SIMD instructions on a general purpose processor |
Jul. 16, 2002 |
| 6366937 |
System and method for performing a fast fourier transform using a matrix-vector multiply instruction |
Apr. 2, 2002 |
| 6247034 |
Fast fourier transforming apparatus and method, variable bit reverse circuit, inverse fast fourier transforming apparatus and method, and OFDM receiver and transmitter |
Jun. 12, 2001 |
| 6230175 |
Reconfigurable digit-serial arithmetic system having a plurality of digit-serial arithmetic units |
May. 8, 2001 |
| 6081821 |
Pipelined, high-precision fast fourier transform processor |
Jun. 27, 2000 |
| 6061705 |
Power and area efficient fast fourier transform processor |
May. 9, 2000 |
| 6058409 |
Computation apparatus and method |
May. 2, 2000 |
| 5890098 |
Device and method for performing fast Fourier transform using a butterfly operation |
Mar. 30, 1999 |
| 5845093 |
Multi-port digital signal processor |
Dec. 1, 1998 |
| 5835392 |
Method for performing complex fast fourier transforms (FFT's) |
Nov. 10, 1998 |
| 5831881 |
Method and circuit for forward/inverse discrete cosine transform (DCT/IDCT) |
Nov. 3, 1998 |
| 5831882 |
Orthogonal transformation processing device |
Nov. 3, 1998 |
| 5805485 |
Arithmetic unit and method for fourier transform |
Sep. 8, 1998 |
| 5764553 |
Generalized data processing path for performing transformation and quantization functions for video encoder systems |
Jun. 9, 1998 |
| 5477478 |
Orthogonal transform processor |
Dec. 19, 1995 |
| 5371696 |
Computational structures for the fast Fourier transform analyzers |
Dec. 6, 1994 |
| 5343208 |
Radar with individually optimized doppler filters |
Aug. 30, 1994 |
| 5313413 |
Apparatus and method for preventing I/O bandwidth limitations in fast fourier transform processors |
May. 17, 1994 |
| 5293330 |
Pipeline processor for mixed-size FFTs |
Mar. 8, 1994 |
| 5204962 |
Processor with preceding operation circuit connected to output of data register |
Apr. 20, 1993 |
| 5117381 |
Discrete orthogonal and inverse orthogonal transform apparatus |
May. 26, 1992 |
| 5091875 |
Fast fourier transform (FFT) addressing apparatus and method |
Feb. 25, 1992 |
| 5028877 |
Circuit arrangement for a fast Fourier transform |
Jul. 2, 1991 |
| 4821224 |
Method and apparatus for processing multi-dimensional data to obtain a Fourier transform |
Apr. 11, 1989 |
| 4787055 |
Circuit for calculating the discrete Fourier transform |
Nov. 22, 1988 |
| 4769779 |
Systolic complex multiplier |
Sep. 6, 1988 |
| 4689762 |
Dynamically configurable fast Fourier transform butterfly circuit |
Aug. 25, 1987 |
| 4501149 |
Micro fracture detector |
Feb. 26, 1985 |
| 4407018 |
Digital signal processor suited for LSI fabrication |
Sep. 27, 1983 |
| 4344151 |
ROM-Based complex multiplier useful for FFT butterfly arithmetic unit |
Aug. 10, 1982 |
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