JPS61247178A - Television receiver - Google Patents

Abstract

PURPOSE:To eliminate the need for a display memory exclusive for an animation picture and for a small-scope and to miniaturize the entire size of a memory by transferring small-scope animation picture data stored in the line memory to a part of a display memory of still picture data. CONSTITUTION:The display memory 28 displaying still picture data by one field and the line memory 24 storing small-scope animation picture data by one horizontal line are provided. In displaying a still picture on a television scope, the still picture data stored in the display memory 28 is read. In displaying a small-scope animation picture on the television screen, small-scope animation picture data by one horizontal line is written on the line memory 24, the small-scope animation picture data by one horizontal line stored in the line memory 24 is transferred to a part of the display memory 28 at each (n) horizontal lines. Then the small-scope animation picture data stored in the display memory 28 is read through the said transfer.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a television receiver, and in particular, to a television receiver that selectively displays still images and small-screen moving images in addition to normal television images on a television screen. Concerning a television receiver that displays images.

(Prior art) In the middle of a broadcast program, for example, if it is a cooking program, it is desirable to write down the menu list of the dishes, or if it is a quiz program, write down the addressee of the quiz answers in a memo. There is. In addition, while the user is enjoying a so-called main program, there are cases where the user wants to display a counter program on a part of the television screen so that the user can check the progress of the program and switch to the broadcast of the program when necessary.

In such cases, if the former is the case, the television image is frozen, and if the latter is a part of the television screen, the counter program can be displayed on a small screen (small screen moving image). There is.

For this reason, in conventional television receivers, a display memory dedicated to still images is provided, and a display memory dedicated to small-screen moving images is provided. However, the display memory dedicated to small screen video images is at least 2
Since a storage capacity for each field is required, there is a drawback that the overall size of the display memory becomes large and the circuit wiring becomes correspondingly complex. This is not desirable in terms of reducing the size of the television receiver and reducing its manufacturing cost.

(Object of the invention) ゛ The present invention has been made in view of the above circumstances, and the present invention has been made in view of the above circumstances.
A line memory for storing 47 minutes of data is provided, and moving image data for a small screen stored in the line memory is transferred to a part of the display memory for still image data. It is an object of the present invention to solve the above-mentioned drawbacks by reading moving image data for use.

(Structure of the Invention) In order to achieve such an object, the present invention includes a display memory that stores one field of still image data, and one field of still image data.
A line memory is provided to store small screen moving image data for horizontal lines.

Then, when displaying a still image on the television screen, the still image data stored in the display memory is read out, but when displaying a small-screen moving image on the television screen, the small screen of one horizontal line is stored in the line memory. At the same time, one horizontal line of small screen moving image data stored in the line memory is transferred to a part of the display memory every n horizontal lines, and then by this transfer, the small screen moving image data is stored in the display memory. The video data for the small screen that is displayed is read out.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 is a circuit block diagram of the entire television receiver according to an embodiment of the present invention.

This television receiver is broadly divided into a main body circuit section 1 and an image processing circuit section 2 for displaying still images and small-screen moving images on a television screen.

In the main circuit section 1, 3 is a TV antenna, 4 is a tuner, 5 is a channel selection control section, 6 is an intermediate frequency amplification/detection circuit, 7 is an audio signal processing section, 8 is a video signal processing section, and 9 is a synchronization signal. 10 is an audio output section, 11 is a video output section, 12 is a deflection output section, 13 is a speaker, 14 is a deflection coil, and 15 is a CRT. Since such a configuration is a normal television receiver, only the names will be listed and a description of its operation will be omitted.

The image processing circuit section 2 includes an input changeover switch 16 and a video output changeover switch 17. The input changeover switch 16 has two individual contacts a1. b
1 and a movable contact C1, and the output of the tuning control section 5 is
If it is a still image side switching signal, the movable contact C1 switches to one individual contact b1 side, and if it is a small screen moving image switching signal, it switches to the other individual contact al side. Similarly, the video output changeover switch 17 has one individual contact a2. b2 and movable contact C2, this movable contact C2 switches between the two individual contacts a2 and b2, and the switching movement will be described later.

(A) Next, regarding the configuration of the main part of the present invention, first, a case where a still image is displayed on the CRT i5 will be described.

The movable contact C1 of the input changeover switch 16 is an individual contact b
The movable contact C2 of the video output changeover switch 17 is switched to the individual contact b2 side. A video signal from the intermediate frequency amplification/detection circuit 6 of the main circuit section 1 is applied to the sub video processing section 20 via the input changeover switch 16 . The sub-video processing section 20 processes the supplied video signal and creates a luminance signal, a color difference signal, and a synchronization signal from this video signal.

The synchronization signal from the sub video processing section 20 is the horizontal synchronization signal SH
and is given to the write control unit 21 as a vertical synchronization signal SV. The write control section 21 outputs a switching signal that controls the operation timing of each circuit section based on the provided synchronization signal.

The luminance signal and color difference signal from the sub video processing section 20 are provided to a multiplexer 22. As shown in FIG. 2, the multiplexer 22 performs a switching operation to output luminance signal data in the first A field and to output color difference signal data in the next B field. In this case, the multiplexer 22 selects Yl for the luminance signal as shown in FIG.
,Y2゜Y3. The color difference signals are outputted sequentially as Y4..., and the color difference signals are R1-Y, Bl as shown in Figure 4.
-Y.

Two color difference signals such as R2-Y, B2-Y, . . . are alternately switched and output.

In this way, each image data of luminance signal data and color difference signal data output from the multiplexer 22 is converted to A/D.
After being subjected to A/D conversion in the conversion circuit section 23, it is temporarily stored in the latch circuit section 25. In this case, the operation timings of the multiplexer 22, A/D conversion circuit section 23, and latch circuit section 25 are controlled by a switching signal from the write control section 21.

Further, the address switching section 27 switches the address according to the address switching signal given from the write control section 21, and then the write address signal from the write control section 21 is given to the display memory 2B. This display memory 2B is designed to store still image data for one field.

Then, in this display memory 2B, the latch circuit section 2
In step 5, each of the image data temporarily stored is written in correspondence with each write address signal. Each image data written in the display memory 2B in this way is then read out in response to readout address signals from readout 1 to control section 26. In this case, the readout control unit 26 creates the readout address signal based on the display synchronization signal from the synchronization signal processing unit 9. Each image data read from the display memory 2B is D/A converted by the D/A conversion circuit section 29, and then given to the video output section 11 of the main circuit section 1 via the video output changeover switch 27. A still image is displayed on the television screen on the pcRT 15, as shown in FIG. 5(a).

(B) Next, the configuration of the main part of the present invention when displaying a small-screen moving image on the CRT 15 will be described.

In this case, the movable contact C1 of the input changeover switch 16 is switched to the individual contact al side. Then, the video signal processed by the small screen tuner 1B and the intermediate frequency amplification/detection circuit 19 is given to the sub video processing section 20 via this input changeover switch 16. In this sub video processing section 20, a luminance signal, a color difference signal, and a synchronization signal are created from the video signal in the same manner as described above, the synchronization signal is output to the write control section 21, and the luminance signal and color difference signal are sent to the multiplexer 22. Output. Multiplexer 22
Then, as shown in FIG. 6, each image data of luminance signal data and color difference signal data is converted to
'i-Y, Y2. Bl-Y.

Y3. R2-Y, . . . are sequentially switched and output. The switching output from the multiplexer 22 is A/D converted by the A/D conversion circuit section 23 and then given to the line memory 25.

This line memory 25 is configured to store one horizontal line of small screen moving image data. That is, each image data is given to this line memory 25 as moving image data for a small screen. As shown in FIG. 7, the small screen moving image data written to the line memory 25 is written every n horizontal scanning line periods, in this embodiment every 3 horizontal scanning line periods, within one horizontal scanning line period (writing line).

Then, the small screen moving image data written to the line memory 25 is temporarily stored in the latch circuit section 25, or
Regarding the small screen moving image data stored here, the luminance signal data is first sent to the display memory 28 during one horizontal scanning line period following this writing line.
The color difference signal data is then transferred to the display memory 28. Each moving image data transferred to the display memory 2B is transferred to a part (shaded area) of the display memory 28, as shown in FIG.

In this way, the small screen moving image data transferred to the display memory 28K is read out by the readout control section 26 during the high level periods of readout A and readout B, as shown in FIG. The readout timing from the display memory 28 is three times the timing at which the small screen moving image data is written into the line memory 25. This makes it possible to display small-screen moving images on the television screen. In addition, while the readout A or B is at a high level, the movable contact C of the video output changeover switch 17
The movable contact C2 is switched to the individual contact b2 side, and during the low level period, the movable contact C2 is switched to the individual contact a2 side. Further, the position where each readout A or B is at the blank level corresponds to the position on the television screen of the small screen moving image shown in FIG. 5(1)). In other words, the position of this small screen moving image is this readout A4.
! It can be changed by controlling the high level position of B or B. In this way, each small screen moving image data output from the display memory 28 is transferred to the D/A conversion circuit section 29.
After D/A conversion, the video output selector switch 17
is supplied to the video output unit 11 via the CRT.
Small-screen moving images are displayed on the television screen on the i5.

(Effects of the Invention) As described above, according to the present invention, a line memory for storing one horizontal line of moving image data for a small screen is provided, and a part of the display memory for still image data is provided. Since the small screen moving image data stored in the line memory is transferred and the small screen moving image data stored in the display memory is read out, a display memory dedicated to small screen moving images is provided. This reduces the overall size of the memory for storage of image data and simplifies circuit wiring. This has made it possible to downsize television receivers and reduce their manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a circuit block diagram of the entire television receiver according to an embodiment of the present invention, Figs. 2 to 4 are diagrams for displaying still images, and Fig. 2 shows the A field and B field. FIG. 3 is a diagram for explaining the operation of a multiplexer that switches and outputs luminance signal data and color difference signal data, respectively. FIG. 3 is a diagram for explaining switching and outputting luminance signal data within one horizontal scanning line period. FIG. Similarly, FIG. 5(a) is a diagram for explaining switching output of color difference signal data within one horizontal scanning line period, FIG. 5(a) is a diagram for explaining displaying a still image on a television screen, and FIG. )
) is a diagram for explaining the case of displaying a moving image for a small screen on a television screen, FIGS. 6 to 9 are diagrams for displaying a moving image for a small screen, and FIG. FIG. 7 is a diagram for explaining the luminance signal data and color difference signal data that are switched and output, and shows the writing timing of each image data of luminance signal data and color difference signal data to the line memory and the writing timing of each image data from the display memory. FIG. 8 is an explanatory diagram of the display memory, and FIG. 9 is a time chart of the read timing. 1 is the main circuit part, 2 is the image processing circuit part, 16 is the input changeover switch, 17 is the video output changeover switch,
21 is a write control section, 24 is a line memory, 26 is a read control section, and 28 is a display memory.

Claims (1)

[Claims] (1) A display memory that stores one field of still image data, a line memory that stores one horizontal line of small-screen moving image data, and a method for writing each image data into the display memory and line memory. a write control circuit that controls the transfer of small screen moving image data stored in the line memory to the display memory and a read control circuit that controls reading of each image data written to the display memory. When displaying a still image on the television screen, the readout control circuit reads the still image data stored in the display memory, and when displaying a small-screen moving image on the television screen, the write control circuit reads out the still image data stored in the display memory. One horizontal line's worth of small screen moving image data is written in the line memory, and the one horizontal line's worth of small screen moving image data stored in the line memory is written into a part of the display memory every n horizontal lines. A television receiver characterized in that when the small-screen moving image data stored in the display memory is read out, the small-screen moving image data is read out by the readout control circuit.