Television – Image signal processing circuitry specific to television – Picture blanking
Reexamination Certificate
1998-06-01
2001-06-19
Eisenzopf, Reinhard J. (Department: 2614)
Television
Image signal processing circuitry specific to television
Picture blanking
C348S553000, C348S563000, C348S564000, C348S731000, C348S734000, C348S633000
Reexamination Certificate
active
06249322
ABSTRACT:
TECHNICAL FIELD
The invention relates to a television receiver and, more particularly, to a channel presetting of a television receiver which realizes a multi-channel.
BACKGROUND ART
In association with the spread of a CATV (Community Antenna Television) and a satellite broadcasting, the number of channels which can be set in a television receiver has been increasing. In the television receiver which can perform a multi-channel reception as mentioned above, in order to preset channels which can be received, an automatic programming process is executed when a television set is purchased.
When the automatic programming process is executed, the channels are scanned, whether a reception signal can be obtained or not is determined on each channel, and the receivable channels are preset. By performing a channel search and presetting the receivable channels as mentioned above, after the channels were preset, the channels are switched to only the preset channels. Even in case of a television receiver which can perform the multi-channel reception, the channel selection can be easily performed.
As mentioned above, in the automatic programming process, the channels are scanned and whether the reception signal is obtained or not is determined on each channel. Therefore, there is a case where the receiver is temporarily set to a channel having no signal.
However, when the receiver is temporarily set to a channel having no signal, a problem that a display on the screen is disturbed occurs.
That is, a display generating circuit to perform the screen display generates a display signal on the basis of a sync signal extracted from the reception signal. Therefore, when the receiver is temporarily set to a channel having no signal during the execution of the automatic programming process, a disturbance occurs in the sync signal and the screen display is disturbed.
Particularly, when a some signal exists at the same frequency as that of the set channel, this signal is received and there is a case where such a channel is erroneously preset as a channel having the signal by the automatic programming process.
In such a case, the preset of the erroneous channel can be erased by a channel erasing/adding process after that. However, when the receiver is set to the channel having no signal, the screen display by the channel erasing/adding process is disturbed, the display of the set channels cannot be known, and the erase of the preset cannot be easily performed.
To prevent such a situation, when the automatic programming process is executed, a method of muting a video signal and performing a screen display on a muting picture plane is considered. By muting the video signal as mentioned above, since the disturbance of the sync signal is eliminated, the disturbance of the display is eliminated.
However, when the video signal is muted, a video image of the received channel can not be seen during the execution of the automatic programing process and the channels to be preset cannot be confirmed.
It is, therefore, an object of the invention to provide a television receiver, a method of setting a reception channel, and an image display method, in which during the execution of an automatic programing process such that channels are sequentially scanned to thereby determined whether they can be received or not and the numbers of the channels which can be received are set, a disturbance of the screen display is eliminated and, even during the execution of the automatic programing process, a received picture plane can be confirmed.
Another object of the invention is to provide a television receiver, a method of setting a reception channel, and an image display method, in which during the execution of a channel erasing/adding process such as to add or erase a channel number, a disturbance of the screen display is eliminated and, even during the execution of the channel erasing/adding process, a received picture plane can be confirmed.
DISCLOSURE OF THE INVENTION
According to the invention, there is provided a television receiver which can preset a channel which can be received, having: reception channel selecting means for selecting a reception channel; detecting means for detecting whether a video signal can be obtained in the reception channel selected by the reception channel selecting means or not and outputting a detection result; reception channel storing means in which the reception channel is stored; and control means for allowing the reception channel selecting means to sequentially scan a plurality of reception channels and allowing receivable reception channels to be stored in the reception channel storing means on the basis of the detection result in each reception channel, characterized in that the television receiver comprises: image display means for displaying an image corresponding to a video signal onto a screen; video signal processing means for displaying at least two video images onto the picture plane on the basis of at least a first video signal corresponding to the channel selected by the reception channel selecting means and a certain second video signal; and switching means for switching the second video signal to be displayed into a second portion on the screen to the first video signal to be displayed into a first portion on the screen and displaying an image based on the first video signal into the second portion on the screen, and the switching means is switched when at least the receivable channel is preset, thereby allowing the image based on the first video signal to be displayed into the second portion on the screen.
According to the invention, there is provided a television receiver which can set a channel which can be received, having: reception channel selecting means for performing a selection of a reception channel; reception channel storing means in which a receivable channel is stored; input means for inputting a desired reception channel; and control means for controlling so that the channel inputted from the input means is stored or erased into/from the reception channel storing means, wherein the television receiver comprises: image display means for displaying an image based on a video signal onto a screen; and video signal processing means for displaying at least two video images based on a first video signal and a second video signal into a first portion and a second portion on the screen, respectively, and when the receivable channel is set, the video signal processing means displays a video image based on a video signal of the channel inputted from the input means into the second portion, and the control means allows the channel inputted from the input means to be stored or erased into/from the reception channel storing means, thereby setting the reception channel.
According to the invention, there is provided a method of setting a reception channel for presetting a channel which can be received into a television receiver, having the steps of: allowing reception channel selecting means to sequentially scan a plurality of reception channels; and detecting whether a video signal is obtained in the reception channel selected by the reception channel selecting means or not and outputting a detection result, characterized in that the method comprises the steps of: storing the receivable reception channel into reception channel storing means on the basis of the detection result in each reception channel; displaying at least two video images onto a screen on the basis of at least a first video signal corresponding to the channel selected by the reception channel selecting means and a certain second video signal; and switching the second video signal to be displayed into a second portion on the screen to the first video signal to be displayed into a first portion on the screen when the receivable channel is preset, thereby displaying an image based on the first video signal into the second portion on the screen.
According to the invention, there is provided a method of setting a reception channel for presetting a channel which can be received into a television receiver, hav
Eisenzopf Reinhard J.
Frommer William S.
Frommer Lawrence & Haug LLP.
Natnael Paulos
Shallenburger Joe H.
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