On-line multi-unit sorting with resolution of superposition potentials

Abstract

An on-line sorting system for multi-unit records is described which solves the problem of the resolution of superposition potentials. A segment of record up to 17 sec long, sampled at 8.3 kc/sec, is continuously stored on digital tape. A backwards and forwards scanning display facility is used by the operator to select up to four units representative of those he desires to analyse. A high-speed scanning operation compares all of the subsequent units in the record with the representative “templates”. Well matching units are automatically accepted and update their appropriate templates. For dissimilar units (usually superposition potentials) a first-order resolution into components is attempted and, if this is unsuccessful, their locations are marked and their “contemporary” templates are stored. After this scan, the systematically recalled superposition potentials are resolved by the operator using two special display facilities. An editing scheme whereby the original recording may be searched for suspected errors ensures error-free interval-time plots. A record of 10 sec duration, in which three different units are to be analysed, might require a total analysis time of 60 sec. The program, written for a DEC PDP-12 with an 8K memory and an Extended Arithmetic Element, is available from the author. In principle, the system is adaptable for any comparable laboratory computer with digital tape or disc systems.