JPS6213174A - Television receiver - Google Patents

Abstract

PURPOSE:To display plural channel pictures at the same time by storing a video information during one horizontal scanning period in a buffer memory during the display scanning period of a channel synchronizing signal, writing the said information in a display memory during the vertical blanking period of a TV synchronizing signal and reading it during the display period. CONSTITUTION:In the multi-mode, when a broadcast station, e.g., A is selected, a multiplexer 10 is controlled in a timing shown in figure and the picture information of the station A is written in a buffer memory 12 in the unit of one horizontal scanning line while being compressed. The information is read during the vertical blanking period and transferred to the designated area of a display memory 13. After a prescribed after when the operation is finished, the said write is stopped tentatively. The timing is applied synchronously with the data transfer time for one field content and a still picture with a small pattern is displayed. In selecting the station B next, the still picture of the stations A, B is displayed. The above-mentioned operations are the still picture of the stations A, B is displayed. The above-mentioned operations are repeated. In operating an operating section 1 to change one of plural still small patterns during channel selection into an animation picture, the multi-mode 1 is intermitted and the video information is transferred continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a television receiver having a function of simultaneously displaying video information of a plurality of channels on a screen.

(Conventional technology) The current state of television broadcasting in our country.

-The number of broadcast stations that can be received in a region is at most 9 channels, and if images from all channels can be displayed simultaneously on one screen, viewers can check the broadcast contents of all broadcast channels in the region at a glance. This makes it convenient to select only one part. However, if three or more images are to be displayed on one screen, it is necessary to install an additional tuner for the number of images, and it is necessary to display images from all broadcast channels in one area on one screen. was practically impossible.

(Object of the Invention) The present invention was made in view of the above problems, and it is made possible to simultaneously display multiple images on one screen, thereby complicating the configuration of the receiver. .

To provide a television receiver that facilitates confirmation of the contents of all channels distributed in a region and provides convenient channel selection operations without increasing the size.

(Structure of the Invention) The television receiver of the present invention is a television receiver that switches channels at regular intervals, sequentially reads out the video signals of each channel, and simultaneously displays images of multiple channels on one screen. .

A tuning section that switches the receive channel of the tuner.

a buffer memory (1a) for storing video information of any channel selected by the channel selection section; and a display memory (1a) for storing video information of each of the plurality of channels selected by the channel selection section. , V is applied to the synchronization signal in the received radio waves to control the writing to the buffer memory and the same as the television! 'Jl signal, a memory control section that controls reading and writing to the display memory in synchronization with the display memory, and a central control section that controls the channel selection section, the channel display memory 7 display memory, and the memory control section. When displaying images of multiple channels on the display screen of a tube, during the display scanning period of the channel synchronization signal.

After storing the video information for one water scanning period in the buffer memory, during the vertical retrace period of the television synchronization signal,
The information in the sofa memory is written into the display memory, read out during the display period of the television synchronization signal, and the video information is displayed on the display screen of the cathode ray tube.

(Example) Hereinafter, two embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a television receiver according to the present invention.

In Fig. 1, when a command to start an operation (hereinafter referred to as multi-mode) that simultaneously displays images of multiple channels on a screen is inputted to the operation unit 1, a signal instructing the operation is sent to the central control unit. Sent to Department 2. The central control section 2 sends a tuning instruction signal to the tuning section 3 in order to cause the circuit to perform the multimode 1 operation, and ν) instructs the tuner to perform the tuning operation. Tuner 5 obtains V IT F", tJ from antenna 4.
Two channel signals, for example, broadcasting station A, are selected from among the HF television signals, and a composite video signal of channel A is output to the video amplification section 6.

The A-channel composite video signal amplified by the video amplification section 6 is input to a video signal processing section 7 and a synchronization signal processing section 8, respectively. In the video signal processing section 7, the composite video signal is separated into a luminance signal (Y signal) and two color difference signals (RY signal, BY signal).

It is input to multiplexer 10. On the other hand, in the synchronization signal processing section 8, the decoded video signal is separated into a horizontal synchronization signal I (and a vertical synchronization signal ■), and each of these classified synchronization signals 11. is input.

FIG. 2 shows the periphery of the multiplexer 10, and the operation of the multiplexer 10 is controlled by each selection control signal YSI1. It is controlled by R5L and BSI at the timing shown in FIG. Zy (that is, 2 selection outside control signals YSL, RSL.

BsI, (J, is created based on the sampling clock ADCK starting from the rising edge of the horizontal synchronizing signal i from the same ijl signal processing unit 8, and Y, R-Y, Y, B-Y.
Each switch of the multiplexer 10 is controlled to select the i-bar in the order of .

R3l1. Turns ON when BSI reaches the "11" level.
becomes.

The luminance signal (Y) and two color difference signals (RY, B-Y) thus temporally divided are input to the A/D converter 11, and the sampling clock AD from the memory controller 9 is input to the A/D converter 11.
The signal is converted into a digital signal by CK and written into the buffer memory 12 in one horizontal scanning line format. When writing this horizontal scanning line, as shown in 5th 4M, the horizontal scanning line 3
This will be done at a rate of one per book. This thins out the amount of data in the vertical direction to 1/3 in order to display multiple screens (nine in this example) on the same screen.

Digital video information for 1547 minutes in the horizontal direction written in the buffer memory 12 is read out during the vertical retrace period according to instructions from the memory control section 9 and transferred to a designated area of the 1-display memory 13. Further, the display memory 13 reads image data written in the display memory 13 according to instructions from the memory control unit 9, and the read image data is
In the A conversion unit 14, the clock D from the memory control unit 9
The signal is converted into an analog video signal by ACK. The converted analog video signal is input to the video output section 15 and guided to the cathode ray tube 17, while the cathode ray tube 17 is driven by each synchronization signal H and V input from the synchronization signal processing section 8 to the deflection output section 16.

Video information is displayed. That is, as shown in FIG. 5 ta+, the horizontal scanning lines of a normal television screen are H, ~11. .

Then, the buffer memory 12 is thinned out as described above.
The horizontal line video information written to H', is compressed (read out at three times the clock speed).

The signals are transferred to the display memory as H'4, H'7, H'+ +:l, . When these operations are performed one after another, a small-screen moving image compressed both horizontally and vertically is displayed on a portion of the display screen of the cathode ray tube 17, as shown in FIG. After a certain period of time, for example 1 to 2 seconds, has elapsed after one field of the normal TV screen has passed, the memory control unit 9 temporarily stops writing data to the buffer memory 12 and display memory 13.The timing of this stop is This is always done in synchronization with the data transfer time for one field.
At that point, video information for one field remains in the designated area of the display memory 13, and is displayed as a still image on a small screen. The state is shown in FIG. 6 (al).Next.

Change the tuner 5's selection to station B, and move it to a different position on the display screen of the cathode ray tube 17, that is, display memory 13.
Write data to other areas in the same way as for station A. Then, since the still image data of station A remains unchanged, the 6th station
As shown in Figure fbl, still images of stations A and B are displayed. If you repeat this operation one after another, the video screen will change to A-B-C.
-D-E-F→G-+H-+I, and the 1ffl
In the places I've been.

As shown in FIG. 6 (C1), a still screen of each channel remains. When this operation reaches one station, the user returns to station A and selects each channel.

Next, when an operation is performed on the operation panel 1 to check the contents of one channel screen (for example, station 0) out of the nine static small screens during channel selection in a continuous video, the multi mode is temporarily disabled. The video information of station 0, which was interrupted and compressed to the small screen position of station 0, is then transferred continuously without ending at the L field, and a small screen moving image is displayed. In other words, during channel selection in multi-mode, any one small screen from multiple small screens that have been updated as still images can be displayed as a moving image, and the contents can be checked as a moving image. This state is shown in FIG. 6(d).

(Effects of the Invention) Since the television receiver of the present invention can simultaneously display images of multiple channels on the same screen, viewers can instantly view the contents of all channels that can be received when selecting a channel. You can check the channel selection easily. Also.

The video from each channel is displayed as a still image.

When updating, it becomes a moving image for a certain period of time, so a continuous and smooth image can be obtained and the visual effect is excellent. Furthermore, when channel selection is performed in multi-mode, any one small-screen still image can be displayed as a small-screen video, making channel selection easier.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of a television receiver according to the present invention, Fig. 2 is a block diagram showing the surroundings of a multiplexer, Fig. 3 is a control timing chart of the multiplexer, and Fig. 4 is a horizontal scanning line diagram. Timing chart showing thinning, FIG. 5(a) is a diagram showing one field of a normal TV screen, FIG. Figure 6 fc
) is a diagram showing a screen on which small-screen still images are sequentially displayed, and FIG. 6 (di is a diagram showing a screen on which one arbitrary small-screen still image is displayed as a small-screen IJJ image. 3... Tuning section , 5...Chu...), 6...Video amplifying unit 7...Video signal processing unit 5 8...VJ1 signal processing unit 9...Memory control unit, 10...Multiplexer 12... ...Bazza memory, 13...Display memory 17...CRT

Claims (1)

[Claims] 1) A television receiver that switches channels at regular intervals and sequentially reads out the video signals of each channel, and displays images of multiple channels simultaneously on one screen, the receiver comprising: A channel selection section for switching, a buffer memory for storing video information of any channel selected by the channel selection section, and a display memory for storing each video signal of one or more channels selected by the channel selection section; a memory control unit that controls writing to the buffer memory based on a synchronization signal in received radio waves and controls writing and reading to the display memory in synchronization with a television synchronization signal; the channel selection unit; the buffer memory; When projecting images of multiple channels on the display screen of a cathode ray tube equipped with a display memory and a central control unit that controls the memory control unit, one horizontal scanning period is set during the display scanning period of the channel synchronization signal. After storing the video information in the buffer memory, the information in the buffer memory is written into the display memory during the vertical retrace period of the television synchronization signal, and is read out during the display period of the television synchronization signal to be displayed on the cathode ray tube. A television receiver is characterized by displaying video information on a screen. 2) One specified channel image of multiple channel images displayed simultaneously on one screen is written to the buffer memory in units of one display horizontal scanning line during the display scanning period of the television synchronization signal, and the next The operation of reading data during a horizontal scanning period and writing it into the display memory is repeated during a display scanning period, and the video screen of a small screen is projected on a display screen of a cathode ray tube by reading data during a display period of a television synchronization signal. A television receiver according to scope 1. 3) The television receiver according to claim 1 or 2, which projects nine different channel images on the same screen.