Television – Synchronization – Locking of video or audio to reference timebase
Reexamination Certificate
2007-11-13
2007-11-13
Lee, Michael H. (Department: 2622)
Television
Synchronization
Locking of video or audio to reference timebase
C348S512000
Reexamination Certificate
active
10344490
ABSTRACT:
The present invention relates to adaptive time-shifting of audio frames (Fa) in encoded audio signal relative to video frames (Fv) in encoded video signal, which together form an audio/video message steam such that the corresponding decoded audio and video signals are aligned in time within the maximum degree of deviation. The invention accomplishes this alignment by determining a desired delay of the encoded audio signal for the decoded signals to meet deviation requirement The desired (Dd) delay is then converted into a frame delay number (nD), which is calculated as one of the two neighbouring integers to a ratio between the desired delay (Dd) and an interval (Ta) at which the audio frames (Fa) are received. A number of audio frames (Fa) equal to the frame delay number (nD) are alternately stored into respective read out from FIFO-buffers (309; 310) such that sufficiently delayed audio frames (Fa) are delivered to an audio decoding unit (313). After signal decoding (313; 315) synchronized audio and video information can thus be presented via a loudspeaker (314) and a video monitor (316) respectively.
REFERENCES:
patent: 5111385 (1992-05-01), Hattori
patent: 5287182 (1994-02-01), Haskell et al.
patent: 5543853 (1996-08-01), Haskell et al.
patent: 5594660 (1997-01-01), Sung et al.
patent: 5617145 (1997-04-01), Huang et al.
patent: 6049769 (2000-04-01), Holmes et al.
patent: 6104706 (2000-08-01), Richter et al.
patent: 6122668 (2000-09-01), Teng et al.
patent: 6181383 (2001-01-01), Fox et al.
patent: 0 577 216 (1994-01-01), None
patent: 0 598 295 (1994-05-01), None
patent: 0 847 155 (1998-06-01), None
patent: 57-182247 (1982-11-01), None
patent: WO 94/27233 (1994-11-01), None
Lee Michael H.
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Synchronisation of audio and video signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Synchronisation of audio and video signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronisation of audio and video signals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3847758