DETECTION OF BIT SYNCHRONIZATION

PURPOSE:To prevent mis-recognition of data by setting a synchronous bit while a different bit width is given from other data and measuring the bit width so as to detect the bit thereby preventing the deviation of synchronization at error restoration. CONSTITUTION:One frame of a data signal 10 consists of a synchronous bit (start bit) 11 of an L level set by 1.5-bit, a one-bit H level open bit 12, a data bit 13 comprising a pescribed bit number and a 1-bit H level stop bit 14. Thus, the bit number of the synchronous bt and the bit number of the data bit are distinguished, the synchronization deviation of error restoration is provented to prevent mis-recognition of data thereby reducing the restoration time and improving the transmission efficiency.