Patent ID: 6141787
Filing Date: 2000-10-31
Classification: G11B,H03M,H04L

Abstract:
A digital modulator which inputs a data stream to convert to a channel bit stream, comprising:dummy data multiplexer for multiplexing a predetermined redundant data as dummy data to a predetermined position within a data block cut out of the data stream to generate a multiplexed data block;an RS encoder for Reed-Solomon-encoding the multiplexed data block as an information part to generate a first Reed-Solomon code;an adder for adding a plurality of types of Reed-Solomon codes for scrambling, each of which has an identification data indicating a scrambling pattern in the same position as the dummy data and each code length of the information part and parity part is equal to that of the information part and parity part of the first Reed-Solomon code, to generate a plurality of second Reed-Solomon codes; anda selector for selecting a second Reed-Solomon code having a desirable characteristic from among the second Reed-Solomon codes to output to an outside.