Picture-in-picture television receiver with separate channel display
First Claim
Patent Images
1. A television receiver comprising:
- (a) a cathode ray tube having a picture screen which is divisible into a main picture screen and one or more sub-picture screens inset into the main picture screen;
(b) a main picture circuit for selecting a first video signal from a plurality of video signals and supplying it as the main picture screen video signal;
(c) a sub-picture circuit for selecting a second video signal from a plurality of video signals and supplying the selected video signal as a sub-picture video signal for one or more of said sub-picture screens inset into the main picture screen of said cathode ray tube;
(d) a composing circuit for composing the selected video signal for a main picture screen of said cathode ray tube and the selected video signal for a sub-picture screen which is inset into a part of said main picture screen into a composite signal which is supplied to the cathode ray tube;
(e) a first adder for adding a picture discrimination indication signal to said video signal for said main picture screen;
(f) a second adder for adding a picture discrimination indication signal to said video signal for said sub-picture screen; and
(g) a system control circuit for controlling said main and sub-pictures circuits, said composing circuit and said first and second adders such that said sub-picture discrimination signal is displayed on said sub-picture screen whenever said sub-picture circuit selects a different second video signal from said plurality of signals.
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Accused Products
Abstract
A picture-in-picture type television receiver in which a sub-picture screen is inset within a main picture screen to allow the same or different pictures to be simultaneously displayed and which includes a circuit for separately displaying the channel numbers of both the main and sub-picture screens momentarily whenever the picture content of the sub-picture screen is changed and whenever the picture content of the main picture is changed if the sub-picture is display.
117 Citations
11 Claims
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1. A television receiver comprising:
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(a) a cathode ray tube having a picture screen which is divisible into a main picture screen and one or more sub-picture screens inset into the main picture screen; (b) a main picture circuit for selecting a first video signal from a plurality of video signals and supplying it as the main picture screen video signal; (c) a sub-picture circuit for selecting a second video signal from a plurality of video signals and supplying the selected video signal as a sub-picture video signal for one or more of said sub-picture screens inset into the main picture screen of said cathode ray tube; (d) a composing circuit for composing the selected video signal for a main picture screen of said cathode ray tube and the selected video signal for a sub-picture screen which is inset into a part of said main picture screen into a composite signal which is supplied to the cathode ray tube; (e) a first adder for adding a picture discrimination indication signal to said video signal for said main picture screen; (f) a second adder for adding a picture discrimination indication signal to said video signal for said sub-picture screen; and (g) a system control circuit for controlling said main and sub-pictures circuits, said composing circuit and said first and second adders such that said sub-picture discrimination signal is displayed on said sub-picture screen whenever said sub-picture circuit selects a different second video signal from said plurality of signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification