Boots – shoes – and leggings
Patent
1993-03-11
1994-12-13
Mai, Tan V.
Boots, shoes, and leggings
36472407, 36472417, 364726, G06F 1531, G06F 1500
Patent
active
053734602
ABSTRACT:
A method and apparatus for the computation of sliding windows and sliding window Fourier transforms and spectrograms requiring fewer operations in comparison with the current art. The sliding windows are realized using infinite impulse response filters. If the impulse response of one filter is equal to the impulse response of a second filter after a period of time, the impulse responses can be canceled thereby resulting in a composite filter with an impulse response of finite length. In certain realizations, the infinite impulse filters have identical components. These components can be combined into a single component in the composite filter thereby reducing the required number of computational operations. Sliding windows thus realized are employed in the generation of sliding window Fourier transforms and spectrograms. The windows can be modulated or unmodulated. For unmodulated windows, the signal to be processed is first multiplied by a discrete oscillator tuned to the desired frequency of the sliding window Fourier transform or spectrogram. Modulated windows are realized with infinite impulse filters containing high frequency components and therefore do not require use of oscillators when used in sliding window Fourier transform and spectrogram circuitry. Sliding window Fourier transform and spectrogram circuitry, connected in parallel for evaluation of a number of frequency lines, can also share common circuitry, thereby significantly reducing computational and architectural overhead. Methods and apparatus for evaluation of temporally decimated sliding window Fourier transforms and spectrogram is achieved through iterative accumulation of intermediate results and downsampling.
REFERENCES:
patent: 5214672 (1993-05-01), Eyuboglu et al.
patent: 5230038 (1993-07-01), Fielder et al.
patent: 5297557 (1994-03-01), Reichl
Mai Tan V.
Ngo Chuong D.
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