TH21180B - Managing beam current limitation for television systems with picture-a-photo capabilities. - Google Patents

Abstract

In a color TV system with picture-in-picture (PIP) capability, the unit is automatically provided for enhancement. In the operation of the beam current limiting (BCL) section, while a small image is shown to prevent the visibility of that small picture from the opposite effect. In an appropriate manner, the comparator BCL control signal is disconnected from the comparison section and the substitute control signal. At the very least, it is approximately the same as the comparative control signal that responds to the user. It is replaced in response to the switching signal, which causes a small image to be inserted in the image in the larger image. However, the BCL is continuous in response to the beam stream during the time when the image is small. Will be displayed until The comparator control signal BCL is replaced with precision in the content of the entire screen image. Combined with the operation of the automatic comparison reduction section that responds to the video signal. In place of white vertices, it is also not available during the time the thumbnail is displayed. In an alternative manner, only the operations of the comparative BCL segment are not available. But the operation of the automatic comparison control is maintained. If a BCL control signal is needed, the brightness can also be connected from the brightness segment.

Claims (10)

1. A television system consisting of a picture tube (19) for creating an image in response to the video signal connected to it; video signal operating channels (9-17) including a path (13) for characterizing such video signal in response to a characterization signal; paths (7,31,33,47-51) including beam current limiting management (BCL) (41) in response to the beam current drawn by the picture tube for generating such characterization signals, which are derived from the BCL control signal generated by the BCL management; path (5) in response to the main channel (MCV) and auxiliary video (ACV) signals and connected to the video signal operating channels for causing the main and smaller auxiliary images to be displayed within the same image on the screen; and a path for causing the main image. The augmented image displayed generates a signal (FS) that indicates the time period in which the augmented image is displayed, and pathway (53) connected to the BCL arrangement and responding to the signal (FS) for improving the operation of the BCL arrangement during the time period in which the augmented image is displayed includes pathway (55) for selecting the suppression of the feature control portion of the video signal from responding to the BCL control signal during the time period in which the augmented image is displayed. Specifically, pathways (7,31) for generating the feature control signal include the portion for generating the augmented control signal and pathway (35) for combining the augmented control signal with the BCL control signal to obtain the feature control signal, and pathways for improvement include pathways (57-61,63,69) for replacing the feature control signal during the time period in which the augmented image is displayed. 2. The television system according to Section 1 also has the characteristic that such BCL arrangement will generate a BCL control signal from which such characteristic control signal is obtained, and the pathways for such enhancement, including the pathway (55) for selecting the suppression pathway for such characteristic control of the video signal connected to such picture tube from response to the BCL control signal during the time in which such enhancement picture is displayed. 3. The television system according to clause 2, which also has the characteristics such that the pathway for the generation of the characteristic control signal shall include a section for the generation of the additional control signal and pathway (35) for the combination of the additional control signal with the BCL control signal to obtain such characteristic control signal, and such pathway for enhancement shall include pathways (57-61,63,69) for the replacement of the additional control signal for such characteristic control signal during the time during which such enhancement picture is displayed. 4. A television system as per clause 3, which still has the characteristics in which the said replacement control contract is in substance equivalent to the said additional control signal. 5. The television system according to clause 1 also has features in which the path (7,31) for generating such feature control signals includes the path (37) for recording such BCL control signals. The path (7,31) for generating such feature control signals also includes a pulse signal source (7,31) with manually adjustable parameters and a filter (63) for filtering such pulse signals, and the path for enhancement also includes the path (53) for selectively removing the resistance for recording such video signals from the feature control section, while the filter (63) is connected to the feature control section. 6. The television system according to Section 5 also has the characteristic that such a path for generating such additional control signal shall include a source of pulse signal (7) encoded according to user preference and a first filter (33) for filtering such pulse signal to generate such additional signal. The path (35) for combining such additional control signal and such BCL control signal shall include the aforementioned first filter portion and the path for such substitution shall include a second filter (63) for filtering such pulse signal to generate such substitution signal. 7. The television system consists of a picture tube (19) for creating an image on the screen in response to the video signal connected to it; a path (5) that responds to the main video signal (MCV) and the auxiliary video signal (ACV) to cause the main and auxiliary images to be displayed simultaneously by the picture tube (19); a path for causing the displayed main and auxiliary images to generate a signal (FS) indicating the time at which the auxiliary image is displayed; and the first automatic control path (7,31,33,41,47-51) which includes beam current limiting management (BCL) (41) that responds to the beam current drawn by the picture tube (19) to automatically control the characteristics of the video signal connected to the picture tube (19) when predefined conditions of the beam current are present, with the characteristics of the second automatic control path. (7,31,33,47,49,50) that responds to the white peak level indication of the video signal connected to the display (19) for the automatic control of the video signal characteristics connected to the picture tube (19) when the predefined conditions for white peak level indication of the video signal appear, and the path (53,71) connected to the first and second automatic control paths (7,31,33,41,47-51;7,31,33,47,49,50) to stop the operation of the first automatic control path, but not to stop the operation of the second automatic control path during the time that the supplemental image is displayed. 8. The television system in accordance with clause 7 also has the feature of a manual control path (7,31,63) connected to path (53,71) to assist in controlling the characteristics of the video signal connected to the display path (19) according to manual settings when operational, and during the time when the supplemental picture is displayed, path (53,71) can enable the user-set control path (7,31,63) to control such characteristics together with the second automatic control path (7,31,33,47,49,71). 9. The television system in claim 7 also has the characteristic that the second automatic control path (7,31,33,47,49,71) is further comprised of a white peak detector (19) for detecting the white peak level of the video signal connected to the aforementioned display path (19). 10. The television system in claim 8 also has the characteristic that the second automatic control path (7,31,33,47,49,71) is further comprised of a white peak detector (19) for detecting the white peak level of the video signal connected to the display path (19).