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AssigneePanasonic Automotive Systems Company of America, Division of Panasonic Corporation of North America
InventorsHans Alfred Troemel, Jr., Dallas Dwight Hickerson
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The disclosed embodiments relate to a system (100) that processes an analog video signal (502), the analog video signal (502) comprising luminance information (408), first chrominance information (410), and second chrominance information (410). An exemplary video system (100) comprises a first time-sampled analog filter (506) that extracts the luminance information (408) from a first aliased copy of the analog video signal (502), a second time-sampled analog filter (508) that extracts the first chrominance information (410) from a second aliased copy of the analog video signal (502), and a third time-sampled analog filter (510) that extracts the second chrominance information (410) from a third aliased copy of the analog video signal (502).
A video system (100) that processes an analog video signal (502), the analog video signal (502) comprising luminance information (408), first chrominance information (410), and second chrominance information (410), the video system (100) comprising:
A method of processing an analog video signal (502), the analog video signal (502) comprising luminance information (408), first chrominance information (410), and second chrominance information (410), the method comprising:
A system (100) for processing an analog video signal (502), the analog video signal (502) comprising luminance information (408), first chrominance information (410), and second chrominance information (410), the system (100) comprising:
A video system (100) that processes an analog video signal (502), the analog video signal (502) comprising luminance information (408), first chrominance information (410), and second chrominance information (410), the video system (100) comprising:
Dependencies are inferred from the claim text.
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About 2 years 2 months of term left · ends 1 Jan 2029 (estimated)
The present invention relates to improving the processing of video signals in communication systems, including National Television System Committee (NTSC) analog video signals.
This section is intended to introduce the reader to various aspects of art which may be related to various aspects of the present invention which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.
Composite video signals are currently used in a wide range of video display systems. Such signals embody all information needed to recreate a video image. This information is encoded into the composite signal in the form of luminance information and chrominance information. When extracted from the composite signal, the luminance and chrominance information is used to construct red, green, and blue color video signals.
The above-mentioned and other features and advantages of the present invention, and the manner of attaining them, will become apparent and be better understood by reference to the following description of one embodiment of the invention in conjunction with the accompanying drawings, wherein:
FIG. 1 is a block diagram of a video system in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a graph showing a low pass filter spectral characteristic;
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate a preferred embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting in any manner the scope of the invention.
This section is intended to introduce the reader to various aspects of art which may be related to various aspects of the present invention which are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.
Exemplary embodiments of the present invention employ a decoder comprising a plurality of filter networks to extract luminance and chrominance information from a sampled analog (continuous time) signal without digitizing the signal. An exemplary embodiment of the present invention exploits the sampling theorem by creating aliased data images centered around different points in a frequency spectrum. A time sampled analog filter (for example, a low pass switch capacitor filter) is employed to separate luminance information from chrominance information in a first aliased image of the composite signal. At the same time, two additional time-sampled analog filters (for example, high pass switch capacitor filters) are employed to demodulate red chrominance information (R-Y) and blue chrominance information (B-Y) from different aliased copies of the sampled analog signal.