A study on the efficient compression algorithm of the voice/data integrated multiplexer

Abstract

A compression technique is required to increase the efficiency of the communication channel. The LZW (Lempel Ziv Welch) algorithm is used as a compression algorithm in communication channel. The LZW algorithm, however, has some redundancies in Hangeul text and voice. The VDI-LZW (voice data integrated LZW) algorithm that decreases the redundancies of the LZW algorithm is suggested as an efficient compression method of Hangeul text and voice. The VDI-LZW algorithm uses both the codeword of the complete Hangeul and a variable length codeword methodology in data compression. For voice compression, it uses the differential method that reduces the codeword size as well as the length of repeated string. This increases the repetition ratio. According to the simulation results, it can be seen that the performance of the proposed compression algorithm is better by 4% to 18% in the data compression ratio and by 35% to 44% in the voice compression ratio than that of the conventional modified LZW algorithms.