| 摘要 |
PURPOSE: A transmitter apparatus of a digital television is provided to transmit data in a 4VSB transmission fashion not trellis-coded in a channel where an affect of a distant ghost is severe. CONSTITUTION: In the transmitter apparatus of a digital television which trellis-codes digital data to transmit the digital data in a 8 vestigial side band (VSB) modulation fashion, a four vestigial side band (VSB) coder (75) is provided. In a channel where an affect of a distant ghost is severe, the digital data is transferred in a four vestigial side band modulation fashion not trellis-coded. The four VSB coder (75) comprises a pre-coder for pre-coding one bit of two input symbol bits; and a mapper for receiving a bit not being pre-coded among the two input symbol bits and the pre-coded bit in the pre-coder to map the received bits with a four-level symbol.
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