Patent ID: 7983345
Filing Date: 2011-07-19
Classification: H04N

Abstract:
1. A content receiving apparatus comprising: decoding means for receiving and decoding a plurality of encoded video frames sequentially given video time stamps based on a reference clock of an encoder side and a plurality of encoded audio frames sequentially given audio time stamps based on the reference clock, from a content provision apparatus of said encoder side; storage means for storing a plurality of video frames and a plurality of audio frames obtained by decoding the encoded video frames and the encoded audio frames with said decoding means; receiving means for receiving the reference clock of said encoder side sent from said content provision apparatus with a UDP; calculation means for synthesizing the system time clock of said decoder side with the reference clock of said encoder side and calculating a time difference that occurs due to a difference between a clock frequency of the reference clock of said encoder side and a clock frequency of a system time clock of a decoder side; and timing adjustment means for adjusting video frame output timing for sequentially outputting the plurality of video frames frame by frame, on a basis of audio frame output timing for sequentially outputting the plurality of audio frames frame by frame, according to the time difference, in which the calculation means is operable (i) to perform a first determination which determines whether the time difference is longer than a prescribed time, and (ii) when a result of the first determination indicates that the time difference is longer than the prescribed time, to perform a second determination which determines whether the video time stamps are behind the audio time stamps, and in which timing adjustment means is operable to control outputting of the video frames in accordance with the result of the first determination and, when performed, a result of the second determination.