Evaluation of speech quality impairment due to burst bit errors
Jun‐Ichi Kozono, Hiroshi Irii · Electronics and Communications in Japan (Part I Communications) · 1995
Abstract Although there has been some research on the relation between random errors that cause speech quality impairment and mean opinion score (MOS), speech quality impairment factors have not been clarified for the bursty code error noise. A subjective evaluation experiment that uses a free conversational form is conducted and the effect of bursty code error noise on speech quality is studied. Moreover, Q‐value quantification of bursty code error noise and random code error noise and its additivity are studied. MOS and tolerance rate change linearly according to a logarithmic number of bursts during a certain length of conversation. Impairment changes according to the number of error bit rates in a random bit error. A more simplified relationship can be obtained by converting MOSs to Q values. It is confirmed that the additivity law holds between Q values for impairment that is due to random and bursty errors.