KR0166942B1 - Broadcasting message expression circuit and method of image regeneration apparatus - Google Patents

Abstract

The present invention relates to a broadcast message display circuit and a method of a video reproducing apparatus which detects and notifies a user of a broadcast message carried on a TV broadcast signal while changing a channel when viewing a playback screen and displays the message on the playback screen.

According to the present invention, when a user views a playback screen, the user automatically checks the broadcast channel signal input from the outside periodically and detects whether the broadcast channel signal includes specific message data. After decoding the corresponding character, the decoded character is mixed and displayed on the playback screen so that the user watching the playback screen can recognize it at the same time.

Description

Broadcast message display circuit and method of image reproducing apparatus

1 is a block diagram of an embodiment of a broadcast message display circuit of a conventional video reproducing apparatus.

2 is a block diagram of another embodiment of a broadcast message display circuit of a conventional video reproducing apparatus.

3 is a block diagram of an embodiment of a broadcast message display circuit of a video reproducing apparatus according to the present invention.

4 is an operation flowchart of an embodiment of a broadcast message displaying method of a video reproducing apparatus according to the present invention.

5 is a block diagram of another embodiment of a broadcast message display circuit of a video reproducing apparatus according to the present invention.

6 is an operation flowchart of another embodiment of a broadcast message displaying method of an image reproducing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

301: microcomputer 302: tuner unit

303: message detector 304: message decoder

305: OSD unit 306: Mixing unit

501: First video signal input unit 502: Second video signal input unit

503, 516: switching unit 504, 508: buffer

505, 507: Sync separation unit 509: Main decoder

510: main microcomputer 511: system ROM

512: memory 513: font ROM

514: full OSD unit 515: mixer

The present invention relates to a broadcast message display in a video reproducing apparatus, and more particularly, to a broadcast message display circuit and a method of a video reproducing apparatus for recognizing a broadcast message sent as a TV broadcast signal when a user views a playback screen and displaying the same on a playback screen. It is about.

In general, a character broadcasting system is a broadcasting system in which image information, which is composed of characters or figures, is transmitted as a digital signal on a radio wave, and the receiving side converts the image information into a TV signal and displays it on a receiver. do.

At this time, when data is transmitted from a broadcasting station, one of unused scan lines of a video base band is designated and transmitted on one horizontal line 1H.

For example, the K system (Korea Boradcasting Program System (KBPS)) loads data at 16 bits per 1H in the 16th line of an odd field.

The broadcast message display circuit of the conventional video reproducing apparatus will now be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of a broadcast message display circuit of a conventional video reproducing apparatus, and includes a tuner for selectively transmitting continuous broadcast channel data input through an external antenna to channel data desired by a user. The output signal of the line and the output signal of the line to which the information signal of the character or figure is transmitted are selected by switching in the switch 101, and in the luminance / color signal system 102, the output signal and reproduction of the switch 101 are reproduced. It receives a video signal and switches itself to output a playback video signal such as a playback / tuner / line.

In addition, the On Screen Display (hereinafter referred to as OSD) unit 104 outputs an output signal of the luminance / color signal system 102 and a microcomputer 103 that outputs a control signal corresponding to a continuous all-channel. Display the video signal, and the caption unit 105 receives the output signal of the luminance / color signal system 102 and the horizontal and vertical synchronization signals to control the characters of the video signal under the control of the microcomputer 103. TEXT DATA is detected and decoded by the corresponding code to generate text.

In this case, the composite unit 106 combines the playback video signal of the OSD unit 104 with the characters of the caption unit 105 and finally outputs the combined video signal to the image display apparatus.

However, in the above-described FIG. 1, since the TV / VCR mode is distinguished during reproduction, an urgent message or a message that the user must know is not displayed in the reproduction mode.

FIG. 2 is a block diagram showing another embodiment of a broadcast message display circuit of a conventional video reproducing apparatus, wherein a video signal input to the video signal input terminal 201 through a tuner or a luminance / color signal system is used to convert the first buffer 202 into a first buffer 202. The data is input to the sync separator 203 and the data slicer 204 through the sync separator 203 and the data slicer 204.

In this case, the data slicer 204 receives a sample hold (S / H) signal to select a corresponding line from the main decoder 205, slices only data of a specific line on which data is loaded, and then slices the text. Data is output to the main decoder 205.

The main decoder 205 sequentially stores text data in the memory 208.

The data stored in the memory 208 is read by the main decoder 205 when necessary and then displayed by calling the corresponding character from the font ROM 209.

Here, the font ROM 209 may be viewed as a ROM having an ASCII code embedded therein.

In this case, there are two methods of displaying the character, a full OSD method and a function OSD (F-OSD) method.

Here, the full OSD method includes R, G, and B encoding methods, and a digital / analog converter method that generates and outputs a baseband signal using 8-bit data and a clock. The F-OSD method superimposes a live screen. Since the F-OSD itself must be synchronized with the live screen (ie, external synchronization), the mixer 212 receives the horizontal and vertical synchronization signals (H / V) separated and output from the synchronization separator 203. It is received through the main decoder 205 and outputs in synchronization with the live screen.

The switching unit 213 selects and finally outputs the output of the full OSD unit 211 or the mixer 212 under the control of the main decoder 205.

Meanwhile, the reproduction or broadcast signal input through the input terminal 201 is displayed on the screen through the second buffer 210, the mixer 212, and the switching unit 213.

The non-described main microcomputer 207 exchanges data necessary for control with the main decoder 205 in both directions in serial, and the system ROM 206 serves as an assistant of the main microcomputer 207.

However, at the time of data detection, the main signal is the tuner mode, and therefore, in the reproduction and line input modes, the reception of the broadcast signal is stopped by the microcomputer because there is a possibility of mixing with the data already received in the tuner mode.

Accordingly, the second message described above also has a problem in that the emergency message carried on the broadcast signal cannot be received and the user does not recognize it in the play mode.

Accordingly, the present invention has been made to solve the above problems, the user can detect the urgent message transmitted on the TV broadcast signal when viewing the playback screen and superimposed on the playback screen, the user can recognize the emergency message The purpose is to make it.

A feature of the broadcast message display circuit of the video reproducing apparatus according to the present invention for achieving the above object is a tuner for automatically checking and transmitting a video channel signal input through an external antenna when a user views a playback screen at predetermined time intervals. And a message detector for detecting whether there is a specific message in the output signal of the tuner, a message decoder for decoding and outputting the message contents detected by the message detector into corresponding characters, and a playback screen while controlling the operation of each system. A control unit which controls the operation of the tuner unit while watching the playback screen and turns on the operation of the tuner unit at a predetermined cycle and outputs a message by fixing a corresponding channel according to the signal detected by the message detection unit. It is done by

A feature of the method for displaying a broadcast message of an image reproducing apparatus according to the present invention is a first method for detecting whether a specific message data is included in a broadcast channel signal while the user automatically checks the broadcast channel signal periodically input when the user views a playback screen. In step 1, when the message data is detected in the first step, the second step of decoding the message data contents into the corresponding characters by the internal control of the system, and the user who is watching the playback screen simultaneously recognizes the decoded character in the second step. And a third step of displaying the mixture on the playback screen so as to be displayed.

According to another aspect of the present invention, a broadcast message display circuit includes: first video signal input means for outputting a video signal including text information and second video signal input means for outputting a video signal without text information; And switching means for selectively outputting signals input to the first and second video signal input means according to a reproduction mode and a tuner mode, and a video signal output through the switching means while changing a channel received in the reproduction mode. Character information detecting means for detecting whether there is character information and processing the detected character information in a predetermined format, and controlling the switching means according to a user's key input, and displaying character information in the video signal output through the switching means. The character information detecting means is controlled to accurately detect the section, and the detected character information is superimposed in synchronization with the reproduction signal. And control means for controlling and display means for superimposing and displaying the image reproduced under the control of the control means and the character information output from the character information detecting means.

According to another aspect of the present invention, a method of displaying a broadcast message includes a first step of determining whether a playback mode is present, and a second step of selecting a tuner image and selecting a channel if the playback mode is determined in the first step. And a third step of detecting data output on a predetermined line of the selected channel received in the second step, processing the data in a predetermined format, and outputting the data detected in the third step by overlapping the playback video. It consists of steps.

Hereinafter, a preferred embodiment of a broadcast message display circuit and method of a video reproducing apparatus according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram showing an embodiment of a broadcast message display circuit of a video reproducing apparatus according to the present invention, and FIG. 4 is an operation flowchart showing an embodiment of a broadcast message displaying method of a video reproducing apparatus according to the present invention. In the method of transmitting a video signal in OSD form when transmitting a message from a broadcasting station, the OSD form can be viewed when watching a tuner screen by transmitting corresponding data (characters) at a specific level of the OSD form and video signal. When viewing the playback screen, the data (characters) is detected to be displayed at the screen position set by the vertical and horizontal synchronization signals.

In this case, the data (text) transmitted when viewing the playback screen must be transmitted at a specific level (high (H) or low (L)) in order to allow the user to recognize the synchronization. An enable and text data corresponding to data (characters) were carried on the next stage of the signal and transmitted.

As shown in FIG. 3, the structure of the broadcast message display circuit of the video reproducing apparatus of the present invention is automatically controlled by the microcomputer 301 which controls the entire system to continuously receive the video channel signal input through the external antenna when viewing the playback screen. The tuner unit 302 checks and transmits at a predetermined time interval, and detects whether there is a message of a specific level in the video channel signal transmitted from the tuner unit 302, and applies it to the microcomputer 301 at the corresponding level. A message detector 303, a message decoder 304 for decoding the message detected by the message detector 303 into the corresponding data (characters), and a message content of the video channel signal is reproduced when it is detected by the message detector 303. The OSD unit 305 and the OSD unit 305 and the message decipherer 304, which inform the user watching the screen, are synthesized to be displayed simultaneously on the playback screen. The mixing unit 306 is configured to include.

The message detection unit 303 sets the screen position of the data (character) detected by the vertical and horizontal synchronization signals, and simultaneously applies a specific level corresponding to the detected data (character) to the microcomputer 301. do.

As shown in FIG. 4, when the user views the playback screen, the microcomputer 301 determines whether the user has switched to the tuner mode by the user (S401). .

In step S401, if it is determined that the mode has been switched to the tuner mode, the control of the microcomputer 301 interrupts the automatic check of the video channel signal of the tuner unit 302 (S402), and inputs an initially set video channel through an external antenna. Selected by the tuner 302 to display a video signal corresponding to the video channel initially set on the screen (S403).

On the other hand, if it is determined in step S401 that the mode has not been switched to the tuner mode, the video channel data continuously input through the external antenna is automatically checked (S404) and the respective video channel data is applied to the message detector 303 at regular intervals. Then, it is determined whether a message of a specific level is included in each transmitted video channel data (S405).

In this case, since a time interval for detecting each image channel data signal transmitted from the tuner 302 to the message detector 303 is required, a phase detection clock signal sent from the microcomputer 301 to the tuner 302 is required. (PLL), data signals, and enable signals are transmitted at regular time intervals.

Subsequently, if it is determined that the video channel data transmitted in step S405 does not include a message of a specific level, the tuner unit 302 continues to apply the video channel data to the message detection unit 303 while automatically checking the next video channel data. If it is determined in step S405 that the video channel data transmitted to the message detection unit 303 includes a message of a specific level, the video channel data is fixed (S406). It is again compared whether the message is included (S407).

At this time, if it is determined that the video channel data fixed in step S407 does not include a message of a specific level, the tuner unit 302 feeds back the next video channel data to automatically check (S404), and the fixed video channel data. If it is determined that the message contains a specific level, the message detection unit 303 detects the data and applies the message to the message decryption unit 304 (S409). (S408).

The microcomputer 301 continuously generates a control signal such as an enable signal, a clock signal, and a data signal when a specific level of the detected data (character) is applied to the message decryption unit 304. The message decryption unit 304 decodes the detected data into the corresponding code and delivers it again to the microcomputer 301 (S409).

In addition, the microcomputer 301 transmits the corresponding data (characters) to the OSD unit 305 (S412) and simultaneously notifies the user with sound (S410), and displays them on the digitron (S411).

Subsequently, by synthesizing and outputting the data signal transmitted to the OSD unit 305 to be displayed on the playback screen that the user is watching (S413), the user can recognize the urgent message content transmitted from the broadcasting station when viewing the playback screen.

5 is a block diagram showing another embodiment of a broadcast message display circuit of a video reproducing apparatus according to the present invention, and FIG. 6 is an operation flowchart showing another embodiment of a broadcast message displaying method of a video reproducing apparatus according to the present invention. A first video signal input unit 501 for outputting a video signal Tuner V.IN including text information such as an emergency message, and a second video signal Y / C V.IN without text information. A first switching unit 503 and a first switching unit 503 which switch according to a video signal input unit 502, a playback mode, or a tuner mode to selectively output a signal input to the first or second video signal input units 501 and 502; A first buffer 504 for timing adjustment and buffering of a signal output from the first buffer, a first synchronous separator 505 for separating horizontal and vertical sync signals from a video signal output from the first buffer 504, and the first buffer 504 It is loaded on the video signal output from the buffer 504. A data slicer 506 for slicing only data, and a second synchronous separation for separating and outputting a sync signal from a video signal output from the second video signal input unit 502 so as to be superimposed with a playback video when an emergency message is detected during playback. A second buffer 508 which serves to adjust and buffer timing of the video signal output from the second video signal input unit 502, and the data slicer to accurately detect a section in which text information is input from the input video signal. A main decoder 509 for controlling 506 and superimposing the sliced character information in synchronization with a second video signal, and controlling the switching of the first switching unit 503 according to a user's key input and during playback; While changing the data of the received channel, the channel is tuned and controlled to detect data carried in the tuned channel. The main microcomputer 510 and the system ROM for controlling to output the superimposed data 511, a memory 512 for storing the character information sliced under the control of the main decoder 509. Font ROM 513 that outputs a code corresponding to character information read from memory 512 when an ASCII code is embedded and blocks the playback video under control of the main decoder 509, and detects only the detected data. The output of the full OSD unit 514 or the mixer 515 under the control of the full OSD unit 514 for displaying, the mixer 515 for synchronizing and outputting the reproduced video and the detected data, and the main decoder 509. And a second switching unit 516 for outputting the final selected.

In this case, the signal (Tuner V.IN) input to the first video signal input unit 501 is a broadcast channel signal, which is an intermediate frequency (IF) EKS output signal in a pure tuner that is not Y / C separated, and the second video signal input unit. A signal (Y / C V.IN) input to 502 is a Y / C separated signal as a reproduction input and line input signal.

The position of loading data in the broadcast signal in FIG. 5 and FIG. 5 configured as described above may be any unused scan line, but if the KBPS data is on line 16 of the odd field, the emergency message is displayed here. It is good to put it on the unused scan line except 16th line of odd field because there is a possibility of crosstalk.

Therefore, the main decoder 509 outputs a line select signal to the data slicer 506 in order to change the data slicing position according to the reproduction mode and the tuner mode.

That is, when it is determined in the playback mode in step S605 that the first switching unit 503 selects the output of the first video signal input unit 501 under the control of the main microcomputer 510 and through the buffer 504 The data is outputted to the sync separator 505 and the data slicer 506 (S602).

At this time, if the channel is fixed, the main microcomputer 510 may pass a message contained in another channel which is not tuned, and thus, the channel selection data is changed by changing channel tuning data until an emergency message is detected.

Meanwhile, the data slicer 506 selects a predetermined line from the signal input through the first buffer 504 by the line selection signal provided by the main decoder 509 (S603), and checks whether there is character information in the selected line. Is detected and only the detected character information is data processed in a predetermined format and outputted to the mail decoder 509 again (S604).

Accordingly, the main decoder 509 sequentially stores the text data output from the data slicer 506 in the memory 512, and the data stored in the memory 512 is read as necessary by the main decoder 509. Then, the corresponding letter is called from the font ROM 513 and superimposed on the reproduced video signal output through the second video signal input unit 502 to be displayed.

When an emergency message is detected while changing a channel under the control of the main microcomputer 510 (S605 and S606), if an emergency message is detected, the main decoder 509 outputs a data detection signal to the main microcomputer 510 and the main signal. The microcomputer 510 does not change the channel data any more when the data detection signal is input (S607).

In this case, the data detection signal may be represented by a specific level signal such as high or low.

In addition, in the emergency message display method, since the synchronization between the video source of the detected data and the video source being reproduced is inconsistent, the first synchronization separator 507 is required to display the detected data in the F-OSD form. .

That is, when the second sync separator 507 separates the horizontal and vertical sync signals from the reproduced video signal output from the second video signal input unit 502 and outputs them to the main decoder 509 (S608), the mixer 515 Since the white and black signals outputted as are output in synchronization with the reproduced video signal, the detected data is superimposed and displayed on the reproduced screen (S609 and S610).

On the other hand, since the full OSD unit 514 uses internal synchronization, synchronization detection is not necessary. The full OSD unit 514 receives the clock and data signals from the main decoder 509 to interrupt the playback video (611), and only the detected data is OSD. Display in the form (S612).

The second switching unit 516 selects and outputs the output of the full OSD unit 514 or the mixer 515 under the control of the main microcomputer 509.

In addition, when it is determined in the tuner mode at step S601, the first switching unit 503 selects and outputs the Y / C separated video signal output from the second video signal input unit 502 (S613), and the data slicer ( The control unit 506 selects a line on which character information except for an emergency message, for example, KBPS data or the like, is carried out under the control of the main decoder 506 (S614) and slices the data (S615).

The synchronization signal of the first image signal separated by the first synchronization separator 501 is used as an external synchronization when the data is displayed in the F-OSD form in the tuner mode (S616).

As described above, according to the broadcast message display circuit and method of the video reproducing apparatus according to the present invention, a broadcast message carried on a broadcast signal when a playback screen is watched is detected while changing a channel and notified to the user, and the corresponding message is displayed on the playback screen. By displaying the display, the user can recognize the emergency message transmitted from the broadcasting station even when watching the reproduction screen, thereby providing convenience.

Claims (15)

A tuner unit which automatically checks and transmits a video channel signal input through an external antenna at a predetermined time interval when a user views a playback screen, a message detector which detects whether a specific message is present in the output signal of the tuner, and the message detector A message decryption unit for decoding and outputting the detected message content into a corresponding character, and controlling the operation of each system unit to turn on the tuner unit at regular intervals when viewing a playback screen and simultaneously to the signal detected by the message detection unit. And a control unit for outputting a message by fixing a corresponding channel according to the broadcast message display circuit of the image reproducing apparatus. The apparatus of claim 1, further comprising: an OSD unit for informing a user of a specific message detected in the image channel signal, and a mixing unit configured to simultaneously display the output signals of the OSD unit and the message decryption unit on a reproduction screen. A broadcast message display circuit of a video reproducing apparatus. The broadcast message display circuit according to claim 1, wherein the message decoding unit sets screen position coordinates of the data decoded using vertical and horizontal synchronization signals. A first step of detecting whether a broadcast channel signal includes specific message data while the user periodically checks the broadcast channel signal inputted from the outside when the user views the playback screen, and controls the system when the message data is detected in the first step. And a third step of mixing and displaying the message data contents into the corresponding characters, by mixing the characters decoded in the second step on the reproduction screen so that the user watching the reproduction screen can recognize them at the same time. Broadcast message display method of a video playback device characterized in that. The method of claim 4, wherein when the user who is watching the playback screen switches to the tuner mode, the broadcast channel signal automatic check of the first step is interrupted and the initial broadcast channel is displayed on the screen. . The method of claim 4, wherein when the message data contained in the broadcast signal is detected and decoded in the second unit, the message is notified to the user in sound or digitron. A video reproducing apparatus displaying a text or an image, comprising: first video signal input means for outputting a video signal including text information, second video signal input means for outputting a video signal without text information, and in a predetermined mode; The switching means for selectively outputting the signal input to the first and second video signal input means, and detecting whether there is character information in the video signal output through the switching means while changing the received channel. Character information detection means for processing the signal in a predetermined format and outputting the character information detection means; and detecting the character information detection means so as to accurately detect a section in which the video information is output from the video signal output through the switching means. Control means for controlling to be synchronously superimposed, an image to be reproduced under the control of the control means, and the character definition; A broadcast message display circuit of a video reproducing apparatus, comprising: display means for superimposing and displaying text information output from a beam detecting means. The broadcast message display circuit of claim 7, wherein the signal input to the first video signal input unit is a broadcast channel signal. 8. The broadcast message display circuit of claim 7, wherein the signal input to the second image signal input unit is a reproduction input or a line input signal. 10. The apparatus of claim 7, further comprising a synchronization detecting means for detecting a synchronization signal in the second image signal such that the detected character information is displayed superimposed with the reproduced video when the character information is detected through the character information detecting means in the reproduction mode. And a broadcast message display circuit of a video reproducing apparatus. 8. The broadcast message display circuit according to claim 7, wherein said control means selects a channel while changing channel data until character information is detected in a reproduction mode. The display apparatus of claim 7, wherein the display means comprises: a full OSD unit which blocks the reproduced image under the control of the control means and displays only the detected data; and synchronizes the reproduced image with the detected data under the control of the control means. And a display configured to selectively display the mixer, and to selectively display the broadcast message display circuit. A broadcast message displaying method for displaying a text or an image, the method comprising: a first step of determining whether a playback mode is present; a second step of selecting a tuner image and selecting a channel if the playback mode is determined in the first step; And a fourth step of detecting and outputting data on a predetermined line of the selected channel received in step 2, processing the data in a predetermined format, and outputting the data detected in the third step by overlapping the playback video. A broadcast message displaying method of a video reproducing apparatus. The method as claimed in claim 13, wherein in the third step, when data is not detected in a predetermined line of the selected channel, the data is detected while switching channels until data is detected. . The method as claimed in claim 13, wherein the fourth step includes blocking the playback video and displaying only the detected data or synchronizing the playback video with the detected data.