Television – Image signal processing circuitry specific to television – Chrominance-luminance signal separation
Patent
1997-02-10
1999-10-26
Peng, John K.
Television
Image signal processing circuitry specific to television
Chrominance-luminance signal separation
348450, 348607, 348665, 348667, H04N 977
Patent
active
059737530
ABSTRACT:
In analog color television transmission methods, the transmitted CVBS signal comprises luminance and chrominance signals which have to be separated from one another in a television receiver in order to permit separate further processing. Comb filters can be used for this, a picture contents-dependent controller frequently being worked with which switches over between different filter algorithms, that is to say different line combinations, as a function of the respective chrominance signals. In the case of conventional comb signals, the CVBS signal is split into the luminance signal and a chrominance signal which is still to be demodulated into the two color difference signals. In this case, the identification of color edges, in particular, is not always carried out in a manner free from errors. This can lead to only incomplete separation of the luminance and chrominance signals, so that cross effects cannot fully be avoided. Better detection of color edges and hence improved separation of the luminance and chrominance signals can be achieved if the structure of the luminance signal is also investigated for the selection of the filter algorithm. According to the invention, therefore, two color component signals (U*, V*) are demodulated from the CVBS signal, which color component signals are evaluated together with the CVBS signal in order to determine an optimum line combination (CF2) and, corresponding to this combination, permit improved generation of the luminance signal (Y) and of the color difference signals (U, V).
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Copy of Search Report.
Deutsche Thomson-Brandt GmbH
Emanuel Peter M.
Kiel Paul P.
Peng John K.
Sajous Wesner
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