METHOD AND DEVICE FOR DETECTING ERRORS IN MASS DATA REPRESENTED IN P-CODE

摘要

The method consists in checking any code combination of the said mass, in the course of reading-out, as to its correspondence to the criterion of the p-code minimal form and forming an error detection signal in case that criterion is not respected. During recording control digits are additionally carrying the information as to the evenness of the recorded information digits. Another error detection signal is formed in the course of reading-out done upon the results of checking the evenness. Where both error detection signals occur the location of errors is determined in the digits of the outcoming mass. A device for implementing the method comprises a mass data storage unit (1), providing for recording and the storage of the incoming mass data and reading-out the outcoming mass data, the information input of that unit being connected to a unit (2) for intermediate storage of the incoming mass data, whereas its information output is connected to the information input of a unit (3) for intermediate storage of the outcoming mass data which is connected, through its information output, to a unit (4) for checking the correspondence to the criterion of minimal form of p-code. The device is provided with a control digit forming unit (5) connected through its output to the unit (2), and is further provided with an evenness checking unit (6) connected through its input to the unit (3). The device is provided as well with an error locating unit (7), to the information input of which are connected the information outputs of the units (4 and 6). Thus, the signal coming from the unit (7) carries the information as to the location of errors in the digits of the outcoming mass data.