The Anaconda Company

Kamal A Mahmood

A seismic prospecting roll along switch incorporating electronically controlled switches in an improved switch arrangement requiring far fewer switches than previous systems. In a simple form, one switch is provided for each geophone input with one contact of each switch connected to one of the inputs and the other contact of each switch connected in pairs, appropriately selected, to the inputs of amplifier and filter channels. A controller is provided for electronically closing the appropriate switches for each roll along position. In most roll along positions geophone inputs are connected out of order to the signal processing channels and the sequence is corrected by a modified multiplexer which connects the processing channels to a system analog to digital converter.

Simplified roll along switching

Apparatus and method for detecting errors in addressing as well as transfer and storage of data. Both odd and even parity are alternately assigned to data words as a function of the memory address where a particular data word is stored. A parity error on reading occurs when either an error has occurred in the data word itself or when the memory has been incorrectly addressed.

Growing community of inventors

El Paso, TX, United States of America

Kamal A Mahmood