Patent ID: 7764595

Claim:
An apparatus for de-interleaving interleaved data in an Orthogonal Frequency Division Multiplexing (OFDM) based Integrated Services Digital Broadcasting Terrestrial (ISDB-T) receiver, said apparatus comprising: a deinterleaver memory; an OFDM symbol counter incrementing once for each orthogonal frequency division multiplexing-OFDM symbol, wherein a bit width of said OFDM symbol counter is in the range of 23 to 33 bits; a divider for calculating intra buffer offset in said deinterleaver memory for every increment of said OFDM symbol counter; a first lookup table in said deinterleaver memory for obtaining delay buffer sizes for various carriers and interleaving lengths for a given OFDM transmission layer; and a second lookup table in said deinterleaver memory for obtaining buffer base addresses for various carriers and interleaving lengths for a given OFDM transmission layer, wherein said bit width of said OFDM symbol counter is selected based on uninterrupted television viewing time on a particular channel.