Abstract: An outer encoder includes a bit detector that receives a turbo stream provided with a parity insertion region and that detects data bits from the turbo stream, an encoder that convolution-encodes the detected data bits, and a bit inserter that inserts an encoded value outputted from the encoder into the parity insertion region in the turbo stream.

Abstract: A dual transmission stream processing device includes an adaptor which receives a normal stream and generates an adaptation field in each packet of the normal stream; a stuffer which generates a dual transmission stream by stuffing a turbo stream into the adaptation field in a certain packet of the packets constructing the normal stream; and a supplementary reference signal stuffer which reconstructs the dual transmission stream such that a supplementary reference signal, the turbo stream, and the normal stream are combined by stuffing the supplementary reference signal into a first area which is part of the adaptation field of the packets constructing the normal stream. Accordingly, the channel status can be easily acquired as the turbo stream and the normal stream are transmitted effectively.

Abstract: The present invention relates to a Vestigial Side Band (VSB) Digital Television (DTV) in agreement with the DTV standards (A/53) of the Advanced Television System Committee (ATSC), and to a method thereof. More particularly, it provides 4-VSB DTV transceiver that improves reception performance of a receiver by transmitting and receiving dual streams formed of normal data and robust data without increasing average power, regardless of a mixing rate of the normal and robust data. The 4-VSB DTV transceiver of the present research includes an encoding unit for encoding the robust data to be mapped to one of two groups having 4 levels {?5, ?3, 1, 7} and {?7, ?1, 3, 5}.