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Oilfield Glossary
Oilfield Glossary
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Walsh-Hadamard transform

1. n. [Geophysics]
In digital signal processing, a nonsinusoidal transform by addition and subtraction. The Walsh-Hadamard transform is similar to Fourier series analysis, but uses square waves instead of sinusoidal waves. It is used predominantly in communication theory and, to a lesser extent, in filtering logs with a blocky character.