JPS5873283A - Television signal processor - Google Patents

Abstract

PURPOSE:To eliminate the unnaturality of screen, by shrinking a screen with a TV special effect generator, and applying a space filter only for the combined screen through the use of a key signal used at the combination, for the screen combined with another screen. CONSTITUTION:A screen is shrinked with a TV special effect generator, a TV signal combined with another screen is inputted from an input terminal 1, the frequency band is limited with a horizontal frequency band variable filter 3 and the frequency band is limited with a vertical frequency band variable filter 4. A control signal varyig the band of the filters 3, 4 is inputted to a terminal 2. A signal switching device 6 switches an output signal of the filter 4 and a signal inutted to the terminal 1 with a signal at a control signal terminal 5. A key signal used with the shrinking of the screen through the generation of the special effect and with the combination of the shrinked screen to another screen is inputted to a terminal 5, to perform band limit only for the region where the screen is shrinked and combined with the other screen.

Description

[Detailed description of the invention] The present invention relates to a television signal processing device.

When reducing a screen and incorporating it into another screen (using a special effects generator, etc. of conventional television cameras), if the area where the image is embedded is out of focus of the camera, the focus of the image that has been reduced and embedded may become clearly focused. The drawback was that the screen had an unnatural effect in that the images (in the background and around the screen) were blurred.

Therefore, it is an object of the present invention to reduce the size of a screen and incorporate it into another screen, such as in a special effects generator for television screens.
Using the key signal used at the time of installation and applying a space filter (a combination of a filter for the horizontal direction and a filter for the vertical direction of the screen) only on the incorporated part, the area around the screen that has been reduced and incorporated is It is an object of the present invention to provide a television signal processing device capable of eliminating unnaturalness of a screen by making the degree of blur equal to the degree of blur.

According to the present invention, a horizontal filter circuit that varies a frequency band corresponding to the horizontal direction of the screen of an input television signal, a vertical filter circuit that varies the frequency band that corresponds to the vertical direction of the screen, and the horizontal filter circuit that varies the frequency band that corresponds to the vertical direction of the screen. It is equipped with a signal switching device that switches the signal passed through the directional and vertical filters and the input television signal by a switching signal obtained from the outside. A television signal processing device is obtained, which is characterized in that only one part of the picture is blurred by limiting the frequency bands in the horizontal and vertical directions of the picture.

The present invention will now be described in detail with reference to the drawings of embodiments of the invention. FIG. 1 shows an example N of the present invention, in which input signal terminals 1. Filter control signal input terminal 2. Horizontal frequency band variable filter 3. Vertical frequency band variable filter 4. Signal switch control signal terminal5. Signal switch 6. and an output signal terminal 7. In Figure 1,
First, the screen is reduced by a television special effect generator, and a television signal incorporated into another screen enters from the input signal terminal 1 and is passed through the horizontal frequency band variable filter 3 at a frequency corresponding to the horizontal line direction of the screen. The frequency band corresponding to the vertical direction of the screen is limited by the vertical frequency band variable filter 4. Here, the horizontal filter has a low-pass characteristic, and the vertical filter has a function of averaging data between a plurality of lines. - Horizontal frequency band variable filter 3 via filter control signal input terminal 2. and a control signal for varying the frequency band of the vertical frequency band variable filter 40.

The signal switch 6 switches between the frequency band limited signal and the signal input to the input signal terminal 1 based on the signal input from the signal switch control signal terminal 5. The signal input from the signal switching device control signal terminal 5 is input to the special effect generator, and the key signal used when the screen is reduced and incorporated into a separate screen is input to the output signal terminal 7. The frequency band is limited only to the area incorporated in the screen, and the frequency band is outputted to the output signal terminal 7.

Figure 2 shows the output signal in Figure 1 displayed on the screen.
Give an example. In the figure, 8 indicates a screen area without frequency band limitation, and 9 indicates a screen that has been reduced and incorporated into screen 8. Here, the screen 9 becomes a blurred screen to the same extent as the screen 8.

As explained above, the present invention reduces the screen using a television special effect generator and uses the key signal used when incorporating the image to be incorporated into another screen, so that only the incorporated part has space. By applying a filter, it is possible to eliminate the unnaturalness of the screen by blurring the incorporated image to the same degree of blur as the incorporated image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment 9'll of the present invention. Figure 2 shows an example in which the output signal of Figure 1 is displayed on the screen. In the figure, 1...input signal terminal, 2...
... Filter control signal input terminal, 3 ... Horizontal frequency band variable filter, 4 ... Vertical frequency band variable filter, 5 ... Signal switch control signal terminal, 6... Signal switch, 7...
Output signal terminal, 8... area of screen where frequency band is not limited, 9... area of screen where frequency band is limited.

Claims (1)

[Claims] A horizontal filter circuit that varies the frequency band corresponding to the horizontal direction of the screen of the input television WYG No. 1, a vertical filter circuit that varies the frequency band corresponding to the vertical direction of the screen, and a front horizontal and vertical filter circuit. Equipped with a signal switcher that switches between the filtered signal and the input television signal using a switching signal obtained externally, the input television signal is switched between the input television signal and only the portion given by the switching signal. A television signal processing device characterized by limiting a frequency band in the vertical direction.