Audio and video communications apparatus and communications method thereof

摘要

An audio and video communications apparatus eliminates a system clock frequency difference, freeing a user from unconformable feeling of audio and video. The audio and video communications apparatus includes: a transmitting unit and a receiving unit (106/108) transmitting and receiving audio and video via a network; a PTS correction timing determining unit (111) determining timing to update a correction amount of a PTS according to information of the audio or the video to be transmitted and received, the PTS being given to the received audio or the received video; a PTS correcting unit (112) correcting the PTS by updating the correction amount at the timing determined by the PTS correction timing determining unit (111); and an audio and video output unit (113) outputting the received audio and the received video corresponding to the corrected PTS found at a current time indicated by the audio and video communications apparatus.

主权项

1. An audio and video communications apparatus comprising:
a transmitting and receiving unit configured to transmit and receive audio and video via a network; a timing determining unit configured to determine a timing at which to update a correction amount of a Presentation Time Stamp (PTS) according to information of (i) the audio to be transmitted from said transmitting and receiving unit, (ii) the video received by said transmitting and receiving unit, and (iii) the audio received by said transmitting and receiving unit, the PTS being given to the received audio or the received video; a PTS correcting unit configured to correct the PTS by updating the correction amount at the timing determined by said timing determining unit; and an audio and video output unit configured to output the received audio and the received video corresponding to the corrected PTS found at a current time indicated by the audio and video communications apparatus, wherein said timing determining unit is configured to determine a difference value of pixels between (i) the video received by said transmitting and receiving unit and (ii) video which temporally precedes the received video, and when the difference value of pixels between (i) the video received by said transmitting and receiving unit and (ii) the video which temporally precedes the received video is determined to be smaller than a predetermined threshold value, said timing determining unit determines that it is the timing at which to update the correction amount.