KR950009676B1 - Wide screen tv - Google Patents

Abstract

The additional channels are displayed on the blank area of a wide screen TV set by 4:3 mode. The TV includes a main memory(4) for storing 4:3 video signal with a specified recording frequency(fwc), POP memory(12) for storing decimated POP video signal, a RGB processor(15) for processing data stored in the POP memory and the main memory to generate 16:9 RGB signals, and a microprocessor(16) for controlling the memories and a tuner.

Description

Pop function wide screen TV receiver

1 is a block diagram of a widescreen TV receiver according to the present invention.

2 is a POP memory data storage map (MAP) state in the present invention.

3 is a timing diagram of a POP memory data signal in the present invention.

4 is a main memory data signal timing diagram according to the present invention.

5 shows a TV screen display format in the present invention, where a is a 4: 3 display format, and b is a POP and 4: 4 display format.

6 is an exemplary format in which one field of 50 Hz and 100 Hz is displayed in the present invention.

* Explanation of symbols for main parts of the drawings

1: main tuner 2: video signal processor

3: A / D converter 4: Main memory

5: Noise canceller 6: Reformator

7: D / A Converter 8: Tuner for POP

9: Image signal processing unit 10: A / D converter

11: decimater 12: POP memory

13: D / A Converter 14: R, G, B Matrix

15: R, G, B processor 16: microprocessor

17: PLL circuit 18: memory controller

The present invention relates to a wide screen TV receiver having a POP function. Especially when displaying a 4: 3 picture on a wide screen, the display is filled with channels captured using a separate tuner in the margin portion of the screen. It is.

The conventional 16: 9 wide screen TV receiver is displayed in a so-called black state without a video signal in parts other than 4: 3 pictures, so the 16: 9 wide screen is not completely filled with pictures, and thus functions as a wide screen. There was a problem that can not be maximized.

Therefore, an object of the present invention is to display a 4: 3 signal and a separate channel picture simultaneously by displaying a 4: 3 picture on a wide screen so that the margin portion of the screen is filled with captured channels using a separate tuner. The present invention provides a widescreen TV receiver capable of POP function.

Hereinafter, described in detail by the accompanying drawings of the present invention.

1 is a block diagram of a widescreen TV receiver according to the present invention, which is sequentially output through a main tuner 1, an image signal processor 2, and an A / D converter 3 (4: 3). ) A main memory 4 for storing video signals at a recording frequency (fwc) and outputting them at 4 / 3fwc, a POP tuner 8 for receiving video signals for POP, and a video signal for POP. A decimator 11 for decimating after conversion, a POP memory 12 for storing the decimated signal in an allocated area, an image stored in the POP memory 12 and an image stored in the main memory 4 Control the operation of the main memory 4 and the PIP memory 12 and the R, G, B processor 15 for outputting R, G, B color signals with a 16: 9 aspect ratio after D / A signal processing. And a microprocessor 16 for controlling a channel to be received by the POP tuner 8.

In addition, the main memory 4 is recorded (stored) at the recording frequency (fwc) and outputs the stored data at 2 * 4 / 3fwc, and the POP memory 12 is recorded (stored) at fwc, and the stored data is stored in 2fwc. Is configured to output

In FIG. 1, reference numeral 17 is a PLL circuit for driving a POP tuner under the control of the microprocessor 16, and 18 is a memory controller for controlling the operation of the main memory and the POP memory.

The operation and effect of the present invention configured as described above will be described with reference to FIGS. 2 to 6.

In the present invention, when the POP function is not selected and when the POP function is selected, two types will be described.

First, when the POP function is not selected (4: 3 picture display)

The digital signal input to the main memory 4 is stored in the field memory at the clock frequency at the time of writing.

If you want to convert the vertical frequency from 50Hz to 100Hz, the data output rate of the memory should be twice the clock frequency at the time of writing.

However, since the input signal is a 4: 3 format signal and the screen composition ratio is 16: 9, the output ratio must be 2 * 4 / 3Groxy clock frequency to display the original image properly.

The reason for reading at the write clock frequency 2 * 4/3 times will be described.

The vertical frequency of the PAL TV is 50 Hz, and the NTSC TV is 60 Hz. In the present invention, the PAL function is taken as an example.

Especially in the case of PAL TV, flickering increases the vertical frequency twice (100Hz).

6 shows such a content.

For example, if the 4: 3 video signal is displayed as 16: 9, and there is no horizontal compression, the 16: 9 screen will be distorted at the center of the 16: 9 screen.To prevent this phenomenon, it is necessary to compress the 16: 9 screen to 4: 3. At this time, 12 * 4/3 = 16 (horizontal screen size), the compression ratio is 4/3 times.

In other words, if the data stored in the landscape: portrait (16: 9) screen is quickly read to 4 / 3fwc by the memory fwc clock, the 4: 3 (12: 9) screen can be created.

Therefore, in the present invention, the data recorded in fwc is intended to be read in 2 * 4 / 3fwc, and in this case, only 4 / 3fwc is required to make a wide TV of 50Hz.

That is, as shown in FIG. 4, the period of the horizontal synchronous (H, Sync) output becomes 32 ms, so that the screen (picture) configuration is displayed as shown in FIG.

Second, when the POP function is selected (4: 3 picture and POP picture display)

First, since the user selects a channel to be included in the POP and displays the maximum number of POP channels, the user can select the number of channels and channels desired.

After the user recognizes the channels selected by the user, the microcontroller 16 controls the PLL circuit 17 to give a POP selection command to the memory controller 18 and to tune to the selected channel.

That is, the microprocessor 16 determines whether or not the "POP", and if the POP selection is not selected, the microprocessor 16 controls only the main memory unit 4 using the memory controller 18, and if the POP is selected, the POP image is displayed. The PLL circuit 17 for receiving is driven to operate the POP tuner 8, and accordingly, the POP tuner 8 receives an image of a channel by the PLL and outputs it to the image signal processor 2.

In addition, the microprocessor 16 controls the POP memory 12 through the memory controller 18.

The POP tuner 8 receives the image of channel 1, stores it in the allocated area of the POP memory 12, and receives the next channel 2 (CH2) image by converting the tuning frequency using the next PLL. It is stored in the area of (12).

When the same operation is completed for the channel 3, the POP memory 12 decimates the images of the channels 1, 2, and 3 (via the decimator 11), and stores them in D / A conversion. , B matrix 14 generates POPs 1, 2, and 3 at the position shown in FIG.

When two or three channels are selected in this way, the microprocessor 16 periodically switches channels.

For example, if three channels are selected, the tuned data values applied to the PLL circuit 17 in the order of channel 1, channel 2, and channel 3 are periodically changed.

The tuned video signals are decimated by the image signal processor 9 and the A / D converter 10 and then 1/3 in the horizontal side and 1/3 in the vertical side by the decimator 11.

The decimated data is stored in the POP memory 12 in order to convert the vertical frequency to 100 Hz.

The data storage map of the POP memory 12 is divided into three block units to store three channels (channels 1 to 3) as shown in FIG.

Here, the POP memory output frequency (fR.CLK) is twice the input frequency (fw.CLK), and the output time is 4: 3 at the start of the horizontal period as shown in the readout signal RD timing as shown in FIG. It is output for 1/4 * 32μsec after the time the picture is displayed.

The vertical synchronization signal V and sync are applied every 20 msec periods, the reset write signal RSTW is generated so that data is written from the first address, and the reset readout signal RSTR is reset every 10 msec periods. To decode the contents of a field.

When the data OUT output from the POP memory 12 passes through the D / A converter 13 and the R, G, and B matrices 14, the analog R, G, and B color signals R1, G1, and B1 are output. Are input to the R, G, and B processors 15.

The R, G, and B color signals R1, G1, and B1 and the analog signal S2 through the D / A converter 7 are time-divided by the R, G, and B processors 15, as shown in FIG. R, G, and B color signals are output through the CPT of the screen TV receiver.

When the R, G, and B color signals output in this way are displayed on the CPT, POP (POP1 to POP3) is located on the right side of the 4: 3 picture as shown in FIG.

6 shows a format in which one field having a frequency of 50 Hz and 100 Hz is displayed.

As described in detail above, in the present invention, when a 4: 3 picture is to be displayed on a 16: 9 wide screen TV receiver, a 4: 3 signal and a separate signal may be obtained by catching and displaying separate channels where a 4: 3 picture does not exist. Since the channel can be simultaneously watched, the reliability of the product can be improved.

Claims (2)

The main memory for storing the video signal (4: 3) outputted sequentially through the main tuner (1), the video signal processing unit (2), and the A / D converter (3) at a recording frequency (fwc) and outputting it at 4 / 3fwc. (4), a POP tuner (8) for receiving a video signal for POP, a decimator (11) for decimating after A / D conversion of the POP video signal, and assigning the decimated signal POP memory 12 for storing in the area, and the image stored in the POP memory 12 and the image stored in the main memory 4 are subjected to D / A signal processing, and then R, G, B color signals having a 16: 9 aspect ratio signal processing. Microprocessor 16 for controlling the operation of the R, G, B processor 15 for outputting the main memory 4 and the POP memory 12, and the channel to be received by the POP tuner 8; Pop (Pop) function wide screen TV receiver, characterized in that consisting of. 2. The main memory (4) according to claim 1, wherein the main memory (4) is recorded (stored) at the recording frequency (fwc), outputs the stored data at 2 * 4 / 3fwc, and the POP memory (12) is recorded at the recording frequency (fwc). (POP) wide screen TV receiver characterized by outputting the stored data to 2fwc.