Television – Basic receiver with additional function – For display of additional information
Patent
1993-06-02
1995-10-03
Kostak, Victor R.
Television
Basic receiver with additional function
For display of additional information
348568, H04N 5445
Patent
active
054556325
ABSTRACT:
A television signal processing circuit that includes a display device having a screen with an aspect ratio of m1:n1 (m1<n1), a circuit for displaying a main-picture originated from a first television signal on the display device, a processor for superimposing a sub-picture originated from a second television signal with a reduced size smaller than the main-picture on a part of the main-picture by thinning out the scanning lines of the second television signals, a selector for selecting the display mode of the main-picture between a normal display mode associated with a first number of scanning lines and a zoom display mode associated with a second number of scanning lines less than the first number of scanning lines as well as an expanded vertical amplitude, and a thinning-out processor responsive to the selecting means for thinning out the scanning lines of the sub-picture, either to display the sub-picture at an aspect-ratio of m2:n2 (m2<n2) by thinning out the scanning lines of the sub-picture to 1/a1 when the main-picture is associated with the normal display mode or to display the sub-picture with an aspect-ratio close to the aspect-ratio of m2:n2 by thinning out the scanning lines to 1/a2 (a1<a2) when the main-picture is associated with the zoom display mode.
REFERENCES:
patent: 4761688 (1988-08-01), Hakamada
patent: 4953025 (1990-08-01), Saitoh et al.
patent: 5065243 (1991-11-01), Katagiri
Tsuchida et al, "Multi-Picture System for High Resolution Wide Aspect Ratio Screen", IEEE Transactions on Consumer Electronics, vol. 37, No. 3, Aug. 1991, New York, pp. 313-318.
Kabushiki Kaisha Toshiba
Kostak Victor R.
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