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Fast video multiplexing system

a video multiplexing and video data technology, applied in the field of video data signal processing, can solve the problems of time division multiplexing output, non-continuous video input, non-synchronised video sources, etc., and achieve the effect of reducing the amount of data los

Inactive Publication Date: 2002-01-15
GE SECURITY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The steps (a) to (f) may be carried out simultaneously and independently for successively selected input video signals, to allow successive fields of the time division multiplexed video signal to be combined without delays caused by lack of synchronisation between the selected video input signals.

Problems solved by technology

A disadvantage of known video TDM's is that the time division multiplexed output, by its definition is non-continuous for any one video input source.
The problem is exacerbated in the case of non-synchronised video sources.

Method used

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Examples

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Embodiment Construction

In a conventional TDM system there is some delay in switching between the outputs of respective video data sources A, B and C. Such system cope with the delay by repeating fields from each source while waiting to switch to the next source. For example, in FIG. 1, field 1 from source A is repeated before a switch can be made to source B, and so on. This reduces the mount of useful data carried by the system. Due to the typically asynchronous nature of different video sources, a finite time is required for synchronisation during the switching from one input video source to the start of a field from the next video source. This problem can be addressed by the synchronisation and phase-locking of the different input video sources. However, this is generally not practical and is costly, as it requires that the synchronising signals be passed between the different sources. Apart from this, the cost of providing very fast switches to switch between successive video sources is relatively hig...

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Abstract

The invention provides a method and apparatus for processing video data signals to generate a time division multiplexed video signal which incorporates a maxima number of fields from successive selected video input signals. The invention provides dual video decoder channels associated synchronisation circuits for generating an early synchronisation signal. The early synchronisation signals are applied to control inputs of the video decoders to enable reading of their output earlier than would normally be possible, avoiding delays in the combining of successive fields of video information in the video TDM signal. The provision of dual channels avoids delays due to lack of synchronisation between the different video sources.

Description

BACKGROUND OF THE INVENTIONThis invention relates to a method of and apparatus for processing video data signals, to combine a plurality of video data signals into a multiplexed signal.Video time-division multiplexers (video TDM's) are known in which a plurality of input video data signals, typically from several video cameras, are combined into a single video data stream. This data stream comprises interleaved time-sliced video data or "map shots" from each of the cameras or other video input sources. A typical time-slice or snap shot of a video TDM signal is one field of an input video data signal. Each snap shot or field is typically marked so that the multiplexed video data stream can be separated and reconstructed or decoded into its component parts, which are the original separate input video data signals. The use of video TDM's permits data from a plurality of video sources to be recorded or transmitted on a single medium by time sharing the medium between the different sourc...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04N7/08G11B27/032
CPCG11B27/032H04N7/0806
Inventor TAYLOR, ERICVAN DER WATT, MARIUS
Owner GE SECURITY INC
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