The paper discusses the part of asic design of tcm ( trellis coded modulation ) in hdtv 8vsb terrestrial channel broadcasting receiver chip . in testing , the tcm can improve the signal - to - noise by 3 . 3db compared with uncoded 4 - vsb modulation , and with the 12 path intrasegment interleaving in tcm coding and viterbi decoding , system can control short burst noise error efficiently 在高清晰度電視信道接收芯片中內(nèi)碼是8 ? vsb的格狀編碼,在系統(tǒng)性能上使用tcm編碼要比未編碼有3 . 3db的編碼增益,另外在格狀編碼中加入了12路的內(nèi)交織,可有效的抑制短的突發(fā)噪聲對(duì)接收端viterbi解碼性能的影響。