Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

A method comprising:

• receiving a broadcast signal;
• demodulating the received broadcast signal by an Orthogonal Frequency Division Multiplex-(OFDM) scheme;
• parsing at least one signal frame from the demodulated broadcast signal;
• time deinterleaving data in the parsed at least one signal frame using a first mode or a second mode, wherein the data is a time interleaved data in the first mode or the second mode, wherein a time interleaving of the second mode comprises a block interleaving to interleave data by column-wise writing at least one FEC block and at least one virtual FEC block, wherein the at least one virtual FEC block is ahead of the at least one FEC block in a TI (Time Interleaving) block and performing a diagonal-wise reading to read out the written at least one FEC block and skipping the virtual FEC block during the diagonal-wise reading;
• and
• decoding the time deinterleaved data,
• wherein the demodulated broadcast signal includes
• first signaling information indicating a position of a deinterleaving selector at the start of the signal frame in the first mode, or
• second signaling information indicating whether an inter-frame deinterleaving scheme is used in the time deinterleaving in the second mode.

An apparatus for receiving broadcast signals, the apparatus comprising:

• a receiver to receive the broadcast signals;
• a demodulator to demodulate the received broadcast signals by an Orthogonal Frequency Division Multiplex (OFDM) scheme;
• a frame parser to parse at least one signal frame from the demodulated broadcast signals;
• a time deinterleaver to time deinterleave data in the parsed at least one signal frame using a first mode or a second mode, wherein the data is a time interleaved data in the first mode or the second mode, wherein a time interleaving of the second mode comprises a block interleaving to interleave data by column-wise writing at least one FEC block and at least one virtual FEC block, wherein the at least one virtual FEC block is ahead of the at least one FEC block in a TI (Time Interleaving) block and performing a diagonal-wise reading to read out the written at least one FEC block and skipping the virtual FEC block during the diagonal-wise reading;
• and
• a decoder to decode the time deinterleaved data,
• wherein the demodulated broadcast signals include
• first signaling information indicating a position of a deinterleaving selector at the start of the signal frame in the first mode, or
• second signaling information indicating whether an inter-frame deinterleaving scheme is used in the time deinterleaving in the second mode.