Comparative study of 24 kb/s ADPCM algorithms
Muhanned AL-Rawi, Muaayed AL-Rawi · Radioelectronics and Communications Systems · 2014
Thepaper is devoted to comparison of four algorithms of 24 kb/sADPCM, standardADPCM (ADPCM-1), and three new modified algorithms (ADPCM-2, ADPCM-3, ADPCM-4). The purpose of the modified algorithms is to reduce the nonlinear distortion introduced by ADPCM when high data rate signal passes through it. The performances of the four algorithms are researched using QAM signal at data rate of 9.6kb/s. The simulation results show that the performance of ADPCM-4 is better than that of ADPCM-3, and the performance of ADPCM-3 is better than that of ADPCM-2, and the performance of ADPCM-2 is better than that of ADPCM-1.