Apparatus for transposition sorting of equal length records in o

Details Apparatus for transposition sorting of equal length records in o Apparatus for transposition sorting of equal length records in o

1976-05-12

1978-03-07

Thomas, James D.

Boots, shoes, and leggings

365 1, G06F 736, G06F 1300, G11C 1102

Patent

active

040782603

ABSTRACT:
An apparatus for sorting of equal length records with the sorting time maximally overlapped by the time taken for loading and unloading of records. The minimal structure consists of a decision mechanism linked to and associated with a network of ladder structures. The activity within the network is so synchronized that the sorting activity in most ladders occurs while some ladder within the network is still undergoing the loading of input data; and during the unloading phase, the individually sorted data from each ladder are merged concurrently to produce a sequence of sorted records. The overlap between sorting and loading varies from 0 for records requiring no loading/unloading, to 100% for multi-ladder networks with loading/unloading.
A single ladder structure supporting a type of transposition sort is first described both in a full exchange scheme and a fast version. Then, the mechanism for loading/unloading equal length records to the single ladder is set forth. Next, the use of two ladders of dissimilar lengths for facilitating the overlap between loading/unloading and sorting is revealed. Lastly, the general multi-ladder case with which complete overlap is achieved terminates the specification.
The ladders themselves are formed from a plurality of equal length loops connected by dual mode switches such that when a switch between a pair of adjacent loops is set electrically into the first mode ("on") the adjacent loops are cross-connected facilitating an exchange of any records circulating therein. When the two switches bounding a loop are electrically set in the second mode ("off"), the loop is maintained as a circulating path. An end loop of each ladder operates as an input/output port.
In one embodiment, control signals for operating the dual-mode switches are developed by an external decision mechanism through the expedient of storing and comparing the keys of each record to be sorted, said signals control the switches in loading, sorting, merging and extracting. An alternate embodiment can employ a plurality of detectors to transmit the detected keys to a decision mechanism dynamically without previously copying the keys.

REFERENCES:
patent: 3950732 (1976-04-01), Chang

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