Seismic Array Processing Techniques. Suboptimal Multichannel Digital Filters
Abstract
The report discusses a new method of generating time-domain filters to extract a signal from digitized multichannel noise. The new filter generation technique is based on the frequency-domain Wiener filter response and uses the mean-square-error of the whole filter set in the transformation back into the time domain. This new, computationally efficient technique was evaluated against a previously used technique, also based on the frequency-domain Wiener filter response. Two different sets of experimental noise data with power spectra specified at 65 frequencies were used in the filter evaluation, and the signal to be detected was assumed to have the same power spectrum as the noise to prevent frequency filtering. For the first noise sample and 37-point long filters, the previous technique gave 0.8 db more error than the optimum frequency-domain filter and the new filtering technique gave 0.5 db more error. For the second noise sample, these respective filters had 1.2 db and 0.9 db more error than the optimum technique.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 28, 1970
- Accession Number
- AD0865534
Entities
People
- Hal H. Bybee
Organizations
- Texas Instruments