Chrominance signal frequency converter as for a pix-in-pix television receiver
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United States of America Patent
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-
Dec 8, 1987
Grant Date -
N/A
app pub date -
Aug 29, 1986
filing date -
Aug 29, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pix-in-pix television signal processing system develops a composite video pix-in-pix signal representing a reduced-size auxiliary image insert in a full-sized main image. The auxiliary video signal is separated into luminance and chrominance components by filtering circuitry. The luminance signal is subsampled in a ratio of one to four and the chrominance signal, which is composed of two color difference signals modulating quadrature phase related subcarrier signals, is applied to circuitry which interpolates between selected pairs of samples to develop a frequency converted chrominance signal, representing the two quadrature phase related color difference signals modulating quadrature phase related subcarrier signals having frequencies that are one-quarter the frequency of the original subcarrier signal. The frequency converted chrominance signal and subsampled luminance signal are combined to generate a composite video signal representing the reduced-size auxiliary image. This signal is combined with the main signal to develop the composite video pix-in-pix signal.
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Cited Art Landscape
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