Magnetic recording apparatus with erroneous recording compensation

Claim 1

Magnetic recording and reproduction apparatus comprising: memory means provided with a predetermined number of blocks, for temporarily storing each of a sequence of data frames received from a data source, each block having a capacity to store one frame of data; address means for cyclically transferring the received sequence of data frames for recording to respective blocks of said memory means for subsequent recording and for cyclically updating the stored contents of the blocks in said memory means in repeating updating cycle; mean for cyclically reading out, in a repeating read-out cycle, the sequence of data frames from the blocks of said memory means; magnetic recording and reproduction means provided with a magnetic main head and a magnetic subhead, the main head receiving the sequence of data frames read-out from the blocks in said memory means and recording the received data frames onto a recording tape, and the sub-head reading out the recorded data frames from the recording tape; error identifying means for detecting a coincidence between each of the data frames read-out by said subhead with the corresponding data frame retrieved from said memory means and identifying any recorded data frame as a recording error data frame and the block which stores the corresponding data frame for recording when said coincidence is not detected; and means for inhibiting the address means from updating the stored contents of any block identified by said error identifying means in a next updating cycle so as to retain the data frame which corresponds to the recording error data frame until after the data frame in the previously identified block has been read out again in a next read-out cycle.