New methods proposal for VoIP transmission

Abstract

For speech transmission is important to make conversion of analog speech signal to digital form. Signal conversion in classic and IP telephony uses Shannon basis decomposition. The Shannon basis used to be the best for speech signal conversion. The reason was, that the computing of the coeficients is very simple, because they are equal to samples of the original signal. In this paper are included teoretical results for new possibilities of transmission voice over IP using different basis. Their advantages rests in better reconstruction of the original signal also in case if we loose some of the data during the transmission(or they aren’t delivered on time and waiting for them will cause degradation of received signal). The dependance between quality of reconstructed signal and percentage of lost packets is estimated by signal to noise ratio SNR. In this paper are described results of simulation for SNR estimation in case of specific choice of generating basis function.