Experimental FFT-vokoder for VoIP
Olexander Tymchenko, Maxim Zayarnyuk · International Conference on Modern Problems of Radio Engineering, Telecommunications and Computer Science · 2010
In this paper the algorithm for speech compration are described. Keywords - MOS, PESQ, G.729. I. INTRODUCTION Low speed codecs for communication of speech data in IP networks which attained the often use are commercial coders G.729 and G.723.1. Offered in (3) experimental vocoder based on DFT needs more detailed research, but for the first approaching even in such kind can be compared to coders mentioned above for verification of fast-acting and quality of compression of speech information. II. COMPARISION OF ALGORITHMS Purpose - experimentally estimate the efficiency and possibility of the use of vocoder based on a DFT in VOIP additions. Consist in objective estimation of legibility of speech after compression. For this purpose used PESQ - PSQM, and also relative comparison of their fast-acting. Chart of experiment is presented on fig. 1. Research of speech information consists their subsequent code in first case used coder G.729, in second vocoder based on a DFT, the farther got signals are compared to original information by the algoritm of PESQ.