Apparatus for checking reading errors in a magnetic record card system

Claim 1

AN APPARATUS ADAPTED TO CHECK FOR THE PROPER READING OF A PREDETERMINED NUMBER OF INFORMATION SIGNALS DURING A READING OPERATION OF INFORMATION RECORDED UPON A RECORD, SAID RECORD HAVING A PLURALITY OF SINGLE CHANNEL INFORMATION SECTORS, EACH SECTOR INCLUDING A PREDETERMINED NUMBER OF INFORMATION SIGNALS AND POSITION CHECKING PATTERN SIGNALS IMMEDIATELY FOLLOWING SAID INFORMATION SIGNALS, SAID POSITION CHECKING PATTERN SIGNAL BEING ARBITRARILY SELECTED AND BEARING SO ARITHMETIC RELATIONSHIP TO SAID INFORMATION SIGNALS ASSOCIATED THEREWITH AND BEING OTHERWISE SIMILAR TO VALID INFORMATION SIGNALS COMPRISING: SENSING MEANS ADAPTED TO SENSE THE INFORMATION AND POSITION CHECKING PATTERN SIGNALS; CONTROL MEANS COUPLED TO SAID SENSING MEANS TO INITIATE S READING OPERATION OF THE INFORMATION SIGNALS RECORDED IN A SELECTED INFORMATION SECTOR; PRESET COUNTING MEANS COUPLED TO SAID SENSING MEANS AND ADAPTED TO COUNT THE PREDETERMINED NUMBER OF INFORMATION SIGNALS RECORDED IN SAID SELECTED INFORMATION SECTOR AND PRODUCE A FIRST SIGNAL WHEN SAID PREDETERMINED NUMBER IS REACHED; POSITION CHECKING PATTERN SIGANL REFERENCE MEANS FOR PROVIDING SECOND SIGNALS INDICATIVE OF THE DESIRED POSITION CHECKING PATTERN SIGNALS INDICATIVE OF MEANS COUPLED TO SAID POSITION CHECKING PATTERN SIGNAL REFERENCE MEANS FOR RECEIVING SAID SECOND SIGNALS AND COUPLED TO SAID SENSING MEANS AND ADAPTED TO RECEIVE SAID POSITION CHECKING PATTERN SIGNALS FROM SAID RECORD AND COUPLED TO SAID COUNTING MEANS AND RESPONSIVE TO SAID FIRST SIGNAL TO COMPARE SAID DESIRED POSITION CHECKING PATTERN SIGNALS FROM SAID REFERENCE MEANS AND SAID POSITION CHECKING PATTERN SIGNALS FROM SAID RECORD SENSED BY SAID SENSING MEANS; AND ERROR INDICATING MEANS COUPLED TO SAID CHECKING MEANS TO PRODUCE AN ERROR INDICATION IF SAID DESIRED AND RECEIVED POSITION CHECKING PATTERN SIGNALS FAIL TO AGREE WHEREBY THE GAIN OR LOSS OF INFORMATION SIGNALS IS INDICATED.

Claim 2

AN APPARATUS ADAPTED TO CHECK FOR THE PROPER READING OF A PREDETERMINED NUMBER OF INFORMATION SIGNALS DURING A READING OPERATION OF INFORMATION RECORDED UPON A RECORD, SAID RECORD HAVING A PLURALITY OF SINGLE CHANNEL INFORMATION SECTORS, EACH SECTOR INCLUDING A PREDETERMINED NUMBER OF INFORMATION SIGNALS AND POSITION CHECKING PATTERN SIGNALS IMMEDIATELY FOLLOWING SAID INFORMATION SIGNALS, SAID POSITION CHECKING PATTERN SIGNAL BEING ARBITRARILY SELECTED AND BEARING SO ARITHMETIC RELATIONSHIP TO SAID INFORMATION SIGNALS ASSOCIATED THEREWITH AND BEING OTHERWISE SIMILAR TO VALID INFORMATION SIGNALS COMPRISING: SENSING MEANS ADAPTED TO SENSE THE INFORMATION AND POSITION CHECKING PATTERN SIGNALS; CONTROL MEANS COUPLED TO SAID SENSING MEANS TO INITIATE S READING OPERATION OF THE INFORMATION SIGNALS RECORDED IN A SELECTED INFORMATION SECTOR; PRESET COUNTING MEANS COUPLED TO SAID SENSING MEANS AND ADAPTED TO COUNT THE PREDETERMINED NUMBER OF INFORMATION SIGNALS RECORDED IN SAID SELECTED INFORMATION SECTOR AND PRODUCE A FIRST SIGNAL WHEN SAID PREDETERMINED NUMBER IS REACHED; POSITION CHECKING PATTERN SIGANL REFERENCE MEANS FOR PROVIDING SECOND SIGNALS INDICATIVE OF THE DESIRED POSITION CHECKING PATTERN SIGNALS INDICATIVE OF MEANS COUPLED TO SAID POSITION CHECKING PATTERN SIGNAL REFERENCE MEANS FOR RECEIVING SAID SECOND SIGNALS AND COUPLED TO SAID SENSING MEANS AND ADAPTED TO RECEIVE SAID POSITION CHECKING PATTERN SIGNALS FROM SAID RECORD AND COUPLED TO SAID COUNTING MEANS AND RESPONSIVE TO SAID FIRST SIGNAL TO COMPARE SAID DESIRED POSITION CHECKING PATTERN SIGNALS FROM SAID REFERENCE MEANS AND SAID POSITION CHECKING PATTERN SIGNALS FROM SAID RECORD SENSED BY SAID SENSING MEANS; AND ERROR INDICATING MEANS COUPLED TO SAID CHECKING MEANS TO PRODUCE AN ERROR INDICATION IF SAID DESIRED AND RECEIVED POSITION CHECKING PATTERN SIGNALS FAIL TO AGREE WHEREBY THE GAIN OR LOSS OF INFORMATION SIGNALS IS INDICATED.