Forward transform processing apparatus and inverse processing ap

Details Forward transform processing apparatus and inverse processing ap Forward transform processing apparatus and inverse processing ap

1992-09-24

1994-09-20

Mai, Tan V.

Boots, shoes, and leggings

G06F 15332

Patent

active

053495497

ABSTRACT:
A method for performing a simplified digital spectral analysis on a block of N samples representing an information signal in the time domain, in which the block of N samples is multiplied by a forward transform window to provide a block of N processed samples. The block of processed samples is digitally preprocessed to provide a block of N/4 complex numbers, which is orthogonally transformed, using digital processing equivalent of a Fast Fourier Transform, to provide a block of N/4 transformed complex numbers. The block of transformed complex numbers is then digitally post-processed to provide a block of N/2 spectral coefficients representing the information signal in the frequency domain. In a method of performing a simplified digital temporal analysis on a block of N/2 spectral coefficients representing the information signal in the frequency domain, the block of spectral coefficients is digitally pre-processed to provide a block of N/4 frequency domain complex numbers, which is orthogonally transformed into a block of N/4 time domain complex numbers by digital processing equivalent to a Fast Fourier Transform. The block of N/4 time domain complex numbers is digitally post processed to provide a block of N/2 processed time domain samples, which is re-arrayed and multiplied by an inverse transform window to provide a block of N samples representing the information signal in the time domain.

REFERENCES:
patent: 4797847 (1989-01-01), Duhamel
patent: 5218561 (1993-06-01), Iwadare
Electronic Engineering, vol. 60, No. 738, Jun. 1988, pp. 99-106, XP000051582, S. Gomez et al: "An Application-Specific FFT Processor."
Proceedings of ICASSP 88, IEEE Press, New York, USA, vol. 4, Apr. 11, 1988, pp. 1989-1992, XP000043448, Surendar Magar et al.: "An Application Specific DSP Chip for 100 MHZ Data Rates."

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