Abstract: A transmitter for transmitting a low probability of detection rf signal, in which digitized audio data is contained therein. Each data frame contains deliberately introduced errors to synchronize a signal containing noise-like data due to skewing of an encoding frame and a data frame upon reception by a receiver.Analog data is converted to digital form by an A/D converter, and then applied to a forward error correction device (FEC encoder) to properly encode the data. One block of input digital data associated with the A/D converter, and one block of input data for creating a codeword associated with FEC encoder are synchronized by a synchronization block, which determines a superframe that constitutes a common multiple of FEC encoder blocks and A/D converter blocks. The superframe is determined by a pulse output from the synchronization block, and that pulse is used to deliberately create one or more errors in the digital data output from the FEC encoder.