Recording medium, transmission methods and apparatus and data reproduction.

APPARATUS FOR DATA TRANSMISSION TO TRANSMIT DATA HAS AN ORIGINAL TO CONVERT CONVERTER original data into data codes SEQUENTIAL. The data code consists of a combination of codes BITS LEVEL HIGH AND LOW LEVEL CODES BITS. The maximum length of CODES BITS CONTINUOUS LEVEL AS LEVEL HIGH IN CODES OF DATA IS LIMITED AT {SUB, MAX}, for example 14T, where T is a unit length representing a binary code, And the minimum length of BINARY cODES CONTINUING ONE LEVEL AS HIGH LEVEL IN DATA cODES IS LIMITED AT {SUB} MIN, FOR EXAMPLE, 3T. A generator generates a synchronization code. Synchronization code consists of a combination of codes BITS AND LOW LEVEL HIGH. Synchronization code comprises an identifier HAVING AN ONGOING BINARY CODES LEVEL AS HIGH LEVEL, predetermined length 16T IS GREATER THAN 2T T {SUB, MAX}. An inserter INSERTS synchronization code intermittently SEQUENTIAL DATA CODES.