Abstract: Digital characters are broadcast by grouping the characters into a series of blocks, and providing each block with a synchronization character and an identifying prefix to form a digital package. The characters in the prefix provide information on the identity of the series, the overall number of packages which form the series, and the number of each package in the series. The characters of the various packages are converted into a 10-bit serial data format which includes one start bit, one stop bit and eight data bits. The serial data is transmitted in synchronous succession, encoded into a differential two-phase signal, and modulated onto a carrier frequency for broadcasting. The reception apparatus comprises a receiver, a digital computer and a connecting interface between the receiver and the serial input of the computer.

Abstract: A method for reducing the probability of the loss of a character in a digital transmission employing biphase coding which comprises the steps of identifying the bits out-of-code, that is the bits which don't correspond to the two biphase code configurations; complementing the logic value said bits are given by the demodulator, if there is parity error; inhibiting a character not comprising out-of-code bits, but in which parity error occurs or if two or more out-of-code bits are present in the character.