Television receiver equipped for simultaneously showing several programs
First Claim
1. A television receiver for displaying a selected first program in the form of a large size picture and simultaneously displaying a further program in an image sector of the first program such that at least one image sector of the further program becomes visible on a screen in the form of a small size picture, said television receiver containing a storage device in which the picture contents of said further program, with a reduced number of lines, is first stored, with the aid of the filtered out vertical and horizontal synchronizing pulses, into defined storage positions and thereafter made visible at least partly in a corresponding position in said large size picture, comprising:
- a first tuner associated with said first program;
a second tuner associated with said further program;
a first IF stage coupled to the output of said first tuner;
a second IF stage coupled with the output of said second tuner;
a first IF demodulator coupled to the output of said first IF stage;
a second IF demodulator coupled to the output of said second IF stage;
first and second partial storages each having an input coupled to the output of said second IF demodulator;
a first electronic switch having a first input coupled to the output of said first partial storage and a second input coupled to the output of said second partial storage;
a second electronic switch having a first input coupled to the output of said first electronic switch and a second input coupled to the output of said first IF demodulator;
a video-amplifier having an input coupled to the output of said second electronic switch; and
logic means for controlling said first and second electronic switches and said first and second partial storages, said logic means responsive to the vertical and horizontal synchronizing pulses of said further program and to the vertical synchronizing pulses and the horizontal flyback pulses of said first program.
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Accused Products
Abstract
This relates to apparatus for the "picture on picture" or "program check" project. Storage, storage control circuits and clock signal generators are disclosed. The storage consists of two parts which are simultaneously fed by selected lines of the second program.
337 Citations
10 Claims
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1. A television receiver for displaying a selected first program in the form of a large size picture and simultaneously displaying a further program in an image sector of the first program such that at least one image sector of the further program becomes visible on a screen in the form of a small size picture, said television receiver containing a storage device in which the picture contents of said further program, with a reduced number of lines, is first stored, with the aid of the filtered out vertical and horizontal synchronizing pulses, into defined storage positions and thereafter made visible at least partly in a corresponding position in said large size picture, comprising:
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a first tuner associated with said first program; a second tuner associated with said further program; a first IF stage coupled to the output of said first tuner; a second IF stage coupled with the output of said second tuner; a first IF demodulator coupled to the output of said first IF stage; a second IF demodulator coupled to the output of said second IF stage; first and second partial storages each having an input coupled to the output of said second IF demodulator; a first electronic switch having a first input coupled to the output of said first partial storage and a second input coupled to the output of said second partial storage; a second electronic switch having a first input coupled to the output of said first electronic switch and a second input coupled to the output of said first IF demodulator; a video-amplifier having an input coupled to the output of said second electronic switch; and logic means for controlling said first and second electronic switches and said first and second partial storages, said logic means responsive to the vertical and horizontal synchronizing pulses of said further program and to the vertical synchronizing pulses and the horizontal flyback pulses of said first program. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification