Microbuffer used in synchronization of image data

Details Microbuffer used in synchronization of image data Microbuffer used in synchronization of image data

1997-09-12

1999-08-10

Harvey, David E.

Television

Synchronization

Locking of video or audio to reference timebase

348565, 348588, H04N 5265

Patent

active

059366770

ABSTRACT:
For use in a set-top box, a relatively small line buffer and a frequency control permit scaling of a video input signal and synchronization between the input signal and a composite output signal. Image data and timing signals derived from the video signal are applied to a video capture engine (VCE). When scaling the input video, the VCE combines an appropriate number of successive lines of the field being processed to produce scaled scan line data for use by a dynamic composition engine (DCE) in producing the composite image. A video odd timing signal is applied to an input odd register, which is monitored by a central processing unit (CPU). The CPU controls the values in a frequency register and in an output odd register. The value in the frequency register determines the frequency of an output clock. The signal from the output clock is applied to a horizontal timing logic circuit that produces an output horizontal sync signal. By adjusting the values in the frequency register and in the output odd register, the CPU is able to control synchronization of the composite image and to determine whether the scaled video is rapidly synchronized with the input signal or is allowed to synchronize more slowly, after a change occurs in the video source. Preference can thus be given either to the stability of the digital signal portion of the composite image or to the scaled video data.

REFERENCES:
patent: 5680178 (1997-10-01), Takeuchi
patent: 5729300 (1998-03-01), Ahn
patent: 5812212 (1998-09-01), Hamamatsu et al.

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