JP2702988B2 - Image signal processing circuit and device using the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-screen display image signal processing device that displays two or more different images on one display device.

[Conventional technology]

The function of projecting another image in a display image is disclosed in
It is well known as a so-called picture-in-picture (hereinafter abbreviated as PIP) function as disclosed in Japanese Patent Application Laid-Open No. 92015 and Japanese Patent Application Laid-Open No. 54-103632. On the other hand, a screen still function for playing back a screen as a still image is also well known, and is becoming one of the ordinary display functions in recent VTRs. However, in the case where the input information is moving image information, there is a problem in that if the screen freeze function is realized, the moving image information after being stopped will be lost. In order to solve this problem, a configuration in which the above-described PIP function and the screen still function are combined, and when a predetermined time has elapsed after the still screen has been played, the screen is automatically switched to a moving image screen and the still screen is reduced and inserted is featured. It is disclosed in JP-A-61-131975.

[Problems to be solved by the invention]

In the above conventional technology, it is possible to check video information,
There is a problem that information on a still screen is lost.

The lack of still screen information is a particularly serious problem in a device such as a video printer that reads out and prints still screen information at a relatively low speed while displaying a still screen. That is, if the still screen is continued to be reproduced until printing is completed in order to prevent the loss of the still screen information, the problem that the moving image information cannot be confirmed remains, and there is a problem that complete still screen information cannot be obtained using the conventional technology. Because.

Therefore, an object of the present invention is to make it possible to confirm moving image information that continues without loss of still screen information on a small screen even when the screen is frozen by an image still function, and to display moving image information that is continued even during multi-display. It is an object of the present invention to provide an image signal processing device that can be checked on a small screen.

[Means for solving the problem]

In order to achieve the above object, in a first invention (image signal processing circuit) of the present invention, a first storage area for storing a digital video signal for one field or one frame as a first signal (see the twelfth embodiment). ), A memory circuit unit (corresponding embodiment) 5 having a second storage area (corresponding embodiment 13) for storing the reduced screen digital video signal as a second signal, 1 for generating a stop signal for stopping the storage in the first storage area, and the first signal based on the stop signal when a video signal is reproduced as a still image on an image display unit.
And a first control circuit for controlling the memory circuit so that the stop of the storage of the signal and the reading thereof correspond to the reproduction of the still image, and the first control circuit for reproducing the moving image on the reduced screen during the reproduction of the still image. And a second control circuit unit for controlling the memory circuit unit so as to combine and read out the second signal and the second signal (the eighth embodiment). .

Further, in the second invention (image signal processing circuit), a first storage area for storing a digital video signal for one field or one frame as a first signal (corresponding embodiment 12); A memory circuit section (Embodiment 5) having a second storage area (Embodiment 13) for storing a signal as a second signal; and storage of the first signal in the first storage area. A stop signal generating unit for stopping, and the first signal based on the stop signal when a video signal is reproduced as a still image on an image display unit.
And a first control circuit for controlling the memory circuit so that the stop of the storage of the signal and the reading thereof correspond to the reproduction of the still image, and the first control circuit for reproducing the moving image on the reduced screen during the reproduction of the still image. A second control circuit unit for controlling the memory circuit unit so as to combine and read the second signal and the second signal (Eighth Embodiment); and the first storage area. In addition, a multi-control circuit unit having a configuration in which a video signal is controlled at a stage preceding the memory circuit unit so as to store a reduced still image multi-screen signal as a third signal instead of the first signal (see the eleventh embodiment) ).

Further, a third invention (apparatus) has a configuration provided with the image signal processing circuit of the first invention, and a fourth invention (device) has a configuration provided with the image signal processing circuit of the second invention.

[Action]

In the first invention, a memory circuit section (Embodiment 5)
Stores the digital video signal for one field or one frame in the first storage area (the twelfth embodiment).
And a second storage area (corresponding to the thirteenth embodiment).
Then, the digital video signal for reduced screen is stored as the second signal. The memory control circuit unit controls the memory circuit unit, and the first control circuit unit is configured to stop the storage of the first signal and read out the first signal when reproducing a still image when reproducing the still image. The memory circuit is controlled as described above. The second control circuit unit (Eighth Embodiment) combines the first signal and the second signal and reads the second signal when reproducing a moving image on a reduced screen during the reproduction of the still image. Controls the memory circuit section. As a result, the still image signal stored in the first storage area is stored without being destroyed by storage and reproduction of the reduced screen.

Further, in the second invention, the multi-control circuit unit (Embodiment 11) controls the received video signal at a stage preceding the memory circuit unit, and stores one field or one field in the first storage area of the memory circuit unit.
Control is performed such that a reduced still image multi-screen signal is stored as a third signal instead of the first signal which is a digital video signal for a frame. As a result, a moving image is simultaneously displayed on a part of the reduced still image multi-screen. Thereafter, the moving image can be reproduced in a part of the multi-image by the same operation as that of the still image. After the A / D conversion circuit, it can be used for both still images and multi-functions, so that moving image information that continues on a still screen or on a multi-screen can be confirmed without a large increase in circuit scale.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of the image signal processing device of the present invention. In FIG. 1, 1 is a tuner unit 2 for receiving an external broadcast wave, an external signal input unit for inputting a video signal of an external video device, 3 is a tuner unit,
A signal processing unit that selects a signal from an external signal input unit and outputs a video signal; and 4 is an A / D conversion circuit that converts the video signal output from the signal processing unit into a digital signal.
Is a memory section for storing a video signal converted into a digital signal, and has a first area 12 for a main screen and a second area 13 for a small screen. 6 is a D / D for converting a digital signal into an analog signal again. The A conversion circuit 7 is an output terminal for outputting a video signal. Reference numeral 8 denotes a still PIP control unit for reproducing a small screen in a still screen, 9 denotes a low-pass filter circuit (hereinafter abbreviated as LPF) for limiting a band to reduce the small screen, and 10 denotes a standard state and a reduced screen state. And a switching circuit 11 for changing the processing path of the video signal.

FIG. 2 shows a screen state of the image signal processing apparatus shown in FIG.

Regarding the operation in FIG. 1, three types of screen states will be described below.

(1) Reproduction of moving image (shown in FIG. 2) The stationary PIP control unit 8 and the multi-control unit 11 are in the standard control state, and the switching circuit 10 selects the path on the a side as shown in FIG. In this state, the video signal is
The moving image can be continuously written to and read from the area 12, and the moving image can be reproduced.

(2) Still picture reproduction (shown in FIG. 2) When the still PIP control unit 8 receives the still picture reproduction command, the writing to the first area of the memory unit 5 is stopped, and the switching circuit 10 sets b
The path on the side is selected, and the video signal band-limited by the LPF 9 is continuously written to the second area 13 of the memory unit 5. The still PIP control unit 8 usually reads the parent screen still image held in the first area 12, and when it becomes the child screen display area, it is continuously written to the second area 13 to read the child image moving image. In this state, a still image is reproduced on the main screen, and a moving image PIP screen is reproduced on the child screen.

(3) Multi-playback (shown in FIG. 2) If a 9-screen multi-view is set, the multi-control unit 11 controls the channel selection of the signal input to the signal processing unit 3 and
Output video signals for 9 stations. Switching circuit 10
The progress of the b side is selected, and the sub-picture corresponding to one sub-picture is sequentially written in the first area 12 of the memory unit 5 per channel selection, and the writing is stopped when nine sub-pictures are written. At this time the static PIP
The control unit 8 performs the same operation as that for reproducing a still image, and reproduces the moving image information continued on the still image reproduction on the eight-selection sub-screen as one child image.

The three types of screen states have been described above. Moving image information that can be continued even during still image reproduction and multi-reproduction can be confirmed on the sub-screen, and the size and position of the sub-screen of the moving image information can be changed during still image reproduction.
By making the same at the time of multi-playback, it becomes possible without greatly increasing the circuit scale.

If only the first area 12 is read during still image reproduction and multi-reproduction, a full-screen still image and a nine-screen multi-still screen reproduction are obtained.

〔The invention's effect〕

As described above, according to the present invention, the screen can be frozen by the screen still function, and when the still image is frozen, the information can be confirmed on a small screen that continues without any loss of the still screen information, and the information that the multi-display continues can be performed. Image signal processing circuit with a new function that can check on a small screen.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image signal processing device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of a screen state realized by the image signal processing device used for explaining the operation of FIG. It is. 5: memory section, 8: stationary PIP control section, 9: filter circuit, 10: switching circuit, 11: multi-control section.

Continuation of the front page (56) References JP-A-62-13172 (JP, A) JP-A-61-224679 (JP, A) JP-A-58-73283 (JP, A) JP-A-61-258584 (JP) , A) JP-A-61-99189 (JP, A)

Claims (4)

(57) [Claims] 1. A first storage area for storing a digital video signal for one field or one frame as a first signal, and a second storage area for storing a reduced screen digital video signal as a second signal. A memory circuit unit having: a stop signal generating unit that stops storing the first signal in the first storage area; and a stop signal when a video signal is reproduced as a still image on an image display unit. A first control circuit for controlling the memory circuit so that the suspension of the first signal based on the first signal and the reading thereof correspond to the reproduction of the still image, and the reproduction of a moving image on a reduced screen during the reproduction of the still image And a second control circuit unit that controls the memory circuit unit so as to combine and read the first signal and the second signal. Image signal processing circuit. 2. A first storage area for storing a digital video signal for one field or one frame as a first signal, and a second storage area for storing a reduced-screen digital video signal as a second signal. A memory circuit unit having: a stop signal generating unit that stops storing the first signal in the first storage area; and a stop signal when a video signal is reproduced as a still image on an image display unit. A first control circuit for controlling the memory circuit so that the suspension of the first signal based on the first signal and the reading thereof correspond to the reproduction of the still image, and the reproduction of a moving image on a reduced screen during the reproduction of the still image A memory control circuit section having a second control circuit section for controlling the memory circuit section so as to combine and read the first signal and the second signal; and , Instead of the first signal An image signal processing circuit comprising: a multi-control circuit section configured to control a video signal at a stage preceding the memory circuit section so as to store a small still image multi-screen signal as a third signal. . 3. An apparatus for displaying a still image or a moving image on an image display unit based on an output processed by an image signal processing circuit, wherein the image signal processing circuit comprises a digital video signal for one field or one frame. And a second storage area for storing the reduced screen digital video signal as a second signal, and a first storage area for storing the reduced screen digital video signal as a second signal. A stop signal generating unit for stopping the storage of the first signal, and stopping and reading of the first signal based on the stop signal when a video signal is reproduced as a still image on a video display unit. A first control circuit for controlling the memory circuit so as to correspond to the still image reproduction, and a first control circuit and a second signal for reproducing a moving image on a reduced screen during the reproduction of the still image. Synthesize Device which is a configuration including a memory control circuit, a having a second control circuit unit for controlling the memory circuit section to begin looking, the. 4. An apparatus for displaying a still image or a moving image on an image display unit based on an output processed by an image signal processing circuit, wherein the image signal processing circuit comprises a digital video signal for one field or one frame. And a second storage area for storing the reduced screen digital video signal as a second signal, and a first storage area for storing the reduced screen digital video signal as a second signal. Generating a stop signal for stopping the storage of the first signal; and stopping and reading out the storage of the first signal based on the stop signal when a video signal is reproduced as a still image on an image display unit. A first control circuit for controlling the memory circuit so as to correspond to the still image reproduction, and a first control circuit and a second signal for reproducing a moving image on a reduced screen during the reproduction of the still image. Synthesize A second control circuit section for controlling the memory circuit section so as to read out the data. The first storage area stores a reduced still image multi-screen signal in the first storage area instead of the first signal. And a multi-control circuit unit configured to control a video signal at a previous stage of the memory circuit unit so as to store the image signal as a third signal.