Synchronizing signal separating apparatus and method

Abstract

This invention is a method and apparatus for identifying and separating the synchronizing signal component of video like signals by identifying or detecting the arrangement or sequence of the known occurances of events or patterns of the sync. The invention also provides for establishing data slicing references in response to the levels of known portions of the sync component.

Description

[0001]This application is a continuation-in-part of application Ser. No. 08 / 493,661, filed Jun. 22, 1995, now abandoned which is continuation in part of U.S. patent application Ser. No. 08 / 165,688 filed Dec. 13, 1993 now U.S. Pat. No. 5,486,869<?insert-start id="INS-S-00001" date="20080701" ?>, which is a continuation of application Ser. No. 07 / 837,323, filed Feb. 18, 1992, now abandoned.BACKGROUND OF THE INVENTION[0002]The present invention relates to signal processing systems and, in particularlyparticular, to video signal processing. A major objective of the present invention is a synchronizing signal processing apparatus and a method that precisely recovers synchronizing signals of a video signal.[0003]Much of modern technology depends on signal processing. A common application of signal processing is for the video type signals. Usually, a video type signal includes an information signal component and picture or data synchronizing information comprisedcomponent. The sync...

AI Technical Summary

Benefits of technology

[0013]The video signal may be sliced, before it is sampled, to eliminate noise. The sliced video signal corresponds to the synchronizing pulses. In response to the sliced video signal, the peaks of the synchronizing pulses of the video signal are precisely sampled. Two sampled signals represent the positive and negative peaks of the synchronizing pulses. The two sampled signals further are divided into three reference signals to compare with the video signal. After this comparison, the logic outputs are combined to recover synchronizing pulses that are reliable, precise and without noise.

[0015]To provide a vertical synchronizing signal, the present invention uses an integrating type filtering means that filters one of synchronizing signals output from the combining to provide a vertical synchronizing signal. The filter means shows a good frequency response characteristic for the vertical synchronizing signal.

[0017]An advantage of the synchronizing signal processing apparatus and method is that the present invention incorporates several standard functions with superior performance. The synchronizing signal processing apparatus in accordance with the present invention is capable of operating with standard two level synchronizing pulses, for example, NTSC, PAL and SECAM type synchronizing pulses, and three level synchronizing pulses, for example HDTV synchronizing pulses. The present invention may also applied for other video type signals with synchronizing pulses.

[0019]The synchronizing signal processing apparatus in accordance with the present invention may be easily adjusted for either two level or three level synchronizing pulses. The recovered synchronizing levels for video signals are characterized by high precision and reliability.

[0021]The synchronizing signal processing apparatus in accordance with the present invention may be used with different video devices, which simplifies the design and manufacture of video devices, and significantly decreases the cost to make these video devices.

Problems solved by technology

In addition, these circuits must separate this information from noise and interference during the reception of weak signals, particularly if impulse noise is present.

Conventional video signal devices for processing the synchronizing information of the video signals can not be used for different standard video signals for providing reliable synchronizing signals, without affecting the reproduction of the video signals or causing high cost of video signal processing.

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