• journal_title：Geophysics
• Contributor：Anthony F. Gangi ; David Disher
• Publisher：Society of Exploration Geophysicists
• Date：1968-
• Format：text/html
• Language：en
• Identifier：10.1190/1.1439923
• journal_abbrev：Geophysics
• issn：0016-8033
• volume：33
• issue：1
• firstpage：88
• section：Articles

A space-time filter has been designed and constructed for use with arrays of transducers on seismic models. The filter allows real time, space-time operations. Adjustments to change the filter parameters are simply performed. The device can be considered an analog implementation of the techniques used in 'digital filtering.'The space-time operator is capable of handling ten spatial (receiving transducer) inputs, and each input can be filtered with up to 20 feedback and feed-forward filter points. The time operators are composed of lumped constant, electric delay lines tapped every 0.5 mu sec with total delays up to 28 mu sec available. The outputs from the delay line taps are summed in an operational amplifier summing circuit. The frequency response of the device is from approximately 10 kHz to 500 kHz, which covers the frequency band normally used in two-dimensional seismology.Some simple experiments have been performed to demonstrate the utility of the device. These experiments are: a) feedforward time operations, b) feedforward/feedback time operations, c) feedforward space operations, and d) space-time operations.