Audio quality estimation method, audio quality estimation apparatus, and computer readable recording medium recording a program

摘要

An audio quality estimation apparatus includes an audio packet loss frequency calculation unit (11) which, when at least one audio packet to be assessed exists in singly or continuously generated IP packet losses, calculates an audio packet loss frequency based on information of received IP packets by counting the packet losses as an audio packet loss of one time regardless of the continuous length, an average influence time calculation unit (12) which calculates, based on information of received IP packets, an average influence time serving as an average time during which audio quality is influenced when the audio packet loss frequency is 1, and a subjective quality assessment value estimation unit (22) which estimates a subjective quality assessment value based on the audio packet loss frequency and average influence time.

主权项

1. An audio quality estimation method for a multimedia telecommunication service which transmits a mixture of an audio packet serving as an IP packet containing audio data, and an IP packet containing no audio data, comprising:
an audio packet loss frequency calculation step of, when at least one audio packet to be assessed exists in singly or continuously generated IP packet losses, calculating an audio packet loss frequency based on information of received IP packets by counting the packet losses as an audio packet loss of one time regardless of a continuous length; an average influence time calculation step of calculating, based on information of received IP packets, an average influence time serving as an average time during which audio quality is influenced by an audio packet loss of one time obtained by said counting; and an subjective quality assessment value estimation step of estimating a subjective quality assessment value based on an encoded audio quality value representing subjective quality of audio whose quality has degraded upon encoding by a codec obtained with an audio bit rate calculated based on information on received IP packets, the audio packet loss frequency and the average influence time.