KR960008069B1 - Channel searching apparatus & method - Google Patents

Abstract

The apparatus is for displaying a broadcasting program of the other channel on a plurality of subscreen area on the screen to confirm the present viewing program and whether a desired program is broadcasting or not and a channel of the desired program, while especially capable of instantly displaying with the screen switching function. The apparatus includes a first tuning unit, a main screen processing means, a second tuning unit, a subscreen processing means, an aspect ratio conversion means, a memory unit, a key input means, a controller, and a color switching means.

Description

Channel search apparatus and method having screen switching function

1 is a state diagram of a channel search image displayed on a CPT of an optical screen television receiver.

2 is a block diagram of a conventional channel search apparatus.

3 is a block diagram of a channel search apparatus having a screen switching function according to an embodiment of the present invention.

4 is a state diagram of a screen switched channel search screen displayed on the optical screen CPT by the channel search apparatus shown in FIG.

5 is a flowchart of a channel search method having a screen switching function according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

ANT1, ANT2: 1st, 2nd antenna 42,48: 1st, 2nd tuner

44,50: first and second intermediate frequency processor 46: main screen processor

52: secondary screen processing unit 54: aspect ratio conversion unit

56: color signal switching unit 58: CPT

60: memory 62: key matrix

63 ~ 65: 1st ~ 3rd sub screen selection key 66: microcomputer

The present invention provides a plurality of auxiliary screens separated from a main screen area in which a broadcast program currently being viewed is displayed in order to allow a viewer to check whether a desired broadcast program is broadcasted together with the broadcast program currently being viewed in the optical screen television receiver. The present invention relates to a channel search apparatus for displaying broadcast programs of other channels that are broadcast in a screen region. In particular, the present invention relates to a channel search apparatus and method having a screen switching function for displaying a broadcast program of a subscreen region selected by a viewer on the main screen region immediately. It is about.

A typical Wide Television Receiver is placed in a Color Picture Tube (hereinafter referred to as CPT) with an aspect ratio of 9 to 16 so that viewers can enjoy the same screen viewing experience as in a movie theater. Display the video program. The optical screen television set includes a channel search apparatus for displaying a broadcast program of a currently selected channel and broadcast programs broadcast on other channels so that a viewer can broadcast a desired broadcast program on one screen. . The channel search apparatus displays a broadcast program of the currently selected channel as shown in FIG. 1 in order to display the broadcast program of the currently selected channel and the broadcast programs broadcast to other channels on one screen. The main screen area 12 for displaying and divided into three sub screen areas 14 to 18 divided up and down in the screen area on the right to be separated from the main screen area 12 and the sub screen areas 14 to 18, a broadcast program having one moving picture and two broadcast programs having a still picture are displayed, and a POP (Picture OutPicture) picture is displayed in which the broadcast program having a moving picture is displayed in the main picture area 12. Then, the viewer should change the main screen area tuner from the currently selected channel to the channel where the desired broadcast program is broadcasted in order to view the desired broadcast program displayed on the sub screen areas 14 to 18 through the main screen area. Alternatively, if the desired broadcast program displayed on the POP screen areas 14 to 18 is a moving picture, the screen search mode should be stopped, the PIP (Picture In Picture) screen mode should be switched, and then the main picture and sub picture should be replaced. As described above, the channel search apparatus of the conventional optical screen television receiver has a problem of allowing a user to operate a plurality of key operations and a tuner since the broadcast program displayed on the sub screen area cannot be directly switched to the main screen area for display. Problems of the conventional channel search apparatus will be described with reference to the accompanying drawings.

Referring to FIG. 2, an intermediate frequency signal loaded with a broadcast program is tuned from a radio frequency signal received through a first antenna ANT1 to the first intermediate frequency processor 22. An intermediate frequency signal loaded with a broadcast program is tuned from the high frequency signals received through the first tuner 20 and the second antenna ANT2 to supply the tuned intermediate frequency signal to the second intermediate frequency processor 28; A channel search apparatus of an optical screen television receiver having two tuners 26 is shown. The first intermediate frequency processor 22 demodulates the video signal and the audio signal from the intermediate frequency signal from the first tuner 20 and supplies the demodulated video signal to the main picture processor 24 while demodulating the audio signal. To the voice output unit (not shown) through the output line. Then, the main picture processor 24 supplies red (R) (hereinafter referred to as R), green (hereinafter referred to as G) and blue (Blue) to be supplied to the display device from the image signal from the first intermediate frequency processor 22. B)) is detected. The second intermediate frequency processor 28 detects the intermediate frequency signal from the second tuner 26 to generate an image signal and an audio signal, and supplies the generated image signal to the sub picture processor 30. The audio signal is sent to the audio output unit (not shown) through the output line. In addition, the sub picture processor 30 generates a color signal by separating the brightness and color difference signals from the video signal and combining the separated brightness and color difference signals to generate the R, G and B signals for the sub screen. The R, G, and B signals are compressed to a certain picture size. The sub picture processor 30 includes three frame memories for generating R, G, and B signals for a sub picture having a moving picture and a sub picture having a still picture.

The conventional channel search apparatus of the optical screen television receiver converts the aspect ratio of the color signals from the main screen processing unit 24 and the sub picture processing unit 30 and applies the converted color signals to the color signal switching unit 34. The part 32 is further provided. The aspect ratio converting unit 32 converts the aspect ratio of the color signal from the main picture processing unit 24 and the color signal from the sub picture processing unit 30 to be 9:16 in the PIP mode, and assists the converted main picture color signal. The color signals for screen are superimposed and the superimposed color signals are supplied to the color signal switching unit 34. The aspect ratio converting unit 32 converts the aspect ratio of the main screen color signal from the main screen processing unit 24 to be 9:16, and supplies the converted main screen color signal to the color signal switching unit 34. In addition, when the screen is searched, the aspect ratio conversion unit 32 supplies the color signal from the sub picture processing unit 30 to the color signal switching unit 34 together with the main signal color signal from the main screen processing unit 30. . The color signal switching unit 34 selectively supplies the color signal from the aspect ratio conversion unit 32 and the on-screen text signal from the microcomputer 40 to the CPT 36 to display the main screen and the main screen on the screen of the CPT 36. A PIP image superimposed on the screen or a POP image as shown in FIG. The microcomputer 40 may include first and second tuners 20 and 26, an auxiliary screen processor 30, a main screen processor 24, and an aspect ratio conversion according to a command from a user input through the key matrix 38. The control unit 32 controls the on-screen text signal to the color signal switching unit 34. In addition, when the screen search command is introduced, the microcomputer 40 changes the tuning frequency band of the second tuner 26 every predetermined time (for example, 30 seconds) and the frame in the sub picture processing unit 30. The memory is replaced so that the sub picture processing unit 30 supplies color signals for one sub picture having a moving picture and two sub picture having a still picture to the aspect ratio converting unit 32 to generate a POP as shown in FIG. To display the image.

As described above, the channel search apparatus of the conventional optical screen television receiver displays a POP image so that the viewer can check whether the desired broadcast program is broadcasted and the broadcast channel, and the viewer selects the subscreen and selects the selected subscreen. Because it is not able to display the image on the main screen, there was a problem of burdening the viewer with the trouble of having to operate the key several times in order to watch through the main screen on which the desired broadcast program is broadcasted.

Accordingly, an object of the present invention is to provide a channel search apparatus and method for an optical screen television receiver having a screen switching function that enables a viewer to select a sub screen being searched and displays an image program of the selected sub screen on a main screen. have.

In order to achieve the above object, the channel searching apparatus of the present invention is characterized by a first tuning means for tuning an intermediate frequency signal loaded with a broadcast program from a high frequency signal received through an aerial line, and a channel from the intermediate frequency signal from the first tuning means. A first image detecting means for detecting an image signal for screen and a second tuning means for tuning an intermediate frequency signal loaded with a broadcast program from a high frequency signal received through said aerial line and an intermediate frequency signal from said second tuning means. A second memory having at least two frame memories for detecting and compressing one sub picture video signal having a moving picture and a still picture and at least one sub picture video signal having a broadcast program different from the moving picture; Image detection means and an image signal from the first image detection means and the second image detection means Key input means including mixing means for mixing the video signals from the means so as not to overlap, a memory for storing the reception channel information of the broadcast programs for the sub-screen, and key switches for selecting the sub-screen, and the moving image The second channel for changing the tuning channel of the second tuning means to a channel different from the channel information stored in the memory in order to switch the auxiliary screen on which the broadcast program is to be displayed at a predetermined period, and storing the image from the second tuning means. 2 to a sub-screen selection key designated by the viewer for switching the frame memory of the image detecting means, storing the switched channel information of the second tuning means in the memory, and moving the broadcast program displayed on the sub-screen toward the main screen. Receive channel information of the broadcast program for the sub-screen. It characterized in that it includes a screen switching function, characterized in that the control means for changing the tuning channel of the first tuning means is read from the memory and tuning to a broadcast program of the read reception channel.

In order to achieve the above object, the process of introducing the screen search command of the present invention and the video signal of the broadcast program received by the first tuner is displayed on the main screen and the video signal of the broadcast program received by the second tuner is at least two. One or more video signals having a moving picture and a still picture and one or more video signals having a broadcast program different from those of the moving picture are compressed by means of at least two frame memories, and the generated at least two or more video signals are generated. Displaying on at least two sub-screens that do not overlap with the screen, and changing the broadcast channel and the display position of the video signal of the sub-screen moving image at regular intervals and changing the tuning channel of the second tuner Change the at least two or more frame memories to store the video signal received by the Storing the tuned channel information in a memory; inputting a selection command of a sub-screen; reading reception channel information of the sub-screen selected by the sub-screen command from a memory; and broadcasting program of the read channel. And a step of switching the tuning channel of the first tuner to tune.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the following detailed description in the following embodiments with reference to the accompanying drawings.

Hereinafter, with reference to Figures 3 to 5 attached to an embodiment of the present invention will be described in detail.

Referring to FIG. 3, a first frequency for tuning an intermediate frequency signal loaded with a broadcast program from a high frequency signal received through the first antenna ANT1 and supplying the tuned intermediate frequency signal to the first intermediate frequency processor 44. A second tuner for tuning the intermediate frequency signal loaded with a broadcast program from the high frequency signal received through the tuner 42 and the second antenna ANT2 to supply the tuned intermediate frequency signal to the second intermediate frequency processor 50; 48. A channel searching apparatus for an optical screen television set having a 48) is described. The first intermediate frequency processor 44 demodulates the intermediate frequency signal from the first tuner 42 to generate a video signal and an audio signal, and supplies the generated video signal to the main picture processor 46. The audio signal is supplied to an audio output unit (not shown) via an output line. The main picture processor 46 processes the video signal from the intermediate frequency processor 44 to generate color signals including the R, G, and B signals, and supplies the generated color signals to the aspect ratio converter 54.

In addition, the main picture processor 46 compresses the color signal generated when necessary to the size of the sub picture, and supplies the sub picture color signal to the aspect ratio converting part 54, and has a frame memory for this purpose. Meanwhile, the second intermediate frequency processor 50 processes the intermediate frequency signal from the second tuner 48 to generate an image signal and an audio signal, and supplies the generated image signal to the sub picture processor 52. The sub picture processor 52 processes the video signal from the second intermediate frequency processor 50 to generate a color signal including the R, G, and B signals, and compresses the generated color signal to a predetermined screen size. The color signal is supplied to the aspect ratio converter 54. The sub picture processor 52 includes three frame memories for generating one sub picture color signal having a moving picture, two sub picture color signals having a still picture, and two sub picture color signals having a still picture. do. In addition, the sub picture processor 52 and the main picture processor 46 separate luminance and color difference signals from the image signals and combine the separated luminance and color difference signals to detect color signals from the image signals. Then, the aspect ratio conversion section 54 converts the aspect ratio conversion, superimposition, and mixing of the color signals from the main screen processing section 46 and the sub picture processing section 52 according to the screen display mode, and converts the aspect ratio conversion, superimposition, and mixed color signals into color signal sections. Supply to affected part 56. In the normal screen display mode, the aspect ratio conversion section 54 converts the aspect ratio of the color signal from the main screen processing section 46 to generate a color signal having an aspect ratio of 9:16. In the PIP screen display mode, the aspect ratio converting section 54 converts the aspect ratio of the main screen color signal from the main screen processing section 46 or the sub picture processing section 52 to be 9:16, and converts the main screen. The sub-screen color signal from the sub-screen processing unit 52 or the main screen processing unit 46 is superimposed on the color signal to generate a main-screen color signal having an aspect ratio of 9:16 with the sub-screen color signals superimposed.

Further, in the screen search (POP screen display) mode, the aspect ratio conversion unit 54 displays the main screen processing unit so that the sub screen image can be displayed in a separate sub screen area separate from the area where the main screen image is to be displayed. The color signal for the main picture from 46 and the color signal for the sub picture from the sub picture processing unit 52 are mixed. The color signal switching section 56 is a color signal from the aspect ratio conversion section 54 and the microcomputer 66 in order to superimpose the on-screen text signal from the microcomputer 66 to the color signal from the aspect ratio conversion section 54. The on-screen text signal is optionally supplied to an electron gun (not shown) of the CPT 58 to display a PIP image, a POP image, and a mono image on the screen of the CPT 58 (not shown).

The channel search apparatus further includes a memory 60 for storing channel data and a key matrix 62 for inputting a command designated by the viewer to the microcomputer 66. The key matrix 62 includes three sub picture selection keys 63 to 65 for selecting a sub picture in the channel search mode (POP screen display), and a screen search mode selection and release key.

The microcomputer 66 controls the first and second tuners 42 and 48, the main and sub picture processing units 46 and 52, and the aspect ratio conversion unit 54 according to the key data from the key matrix 62. And generates an on-screen text signal and supplies it to the color signal switching unit 56. In the channel search (POP screen display) mode, the microcomputer 66 changes the tuning channel of the second tuner 48 at predetermined time intervals, switches the frame memory in the sub picture processing unit 52, and changes it. The tuning channel data of the second tuner 48 is stored in the memory 60 and the on-screen text signal for the changed tuning channel is applied to the color signal switching unit 56.

At this time, the sub picture processing unit 52 generates a color signal for one sub picture having a moving picture and two sub picture having a still picture, and the color signal switching unit 56 is an on-screen character from the microcomputer 66. A signal is inserted into the color signal from the aspect ratio conversion section 54 and applied to the CPT 58. CPT 58 then displays a POP image as shown in FIG. In FIG. 4, in the main screen area 70 located on the left side of the screen 68, the image signals processed by the main screen processing section 46 are displayed and divided into three vertically on the right side of the screen 68. In FIG. In the sub screen areas 72 to 73, three images processed and compressed by the sub screen processing unit 52 are displayed. Among the images displayed on the sub screen areas 72 to 76, a moving picture is displayed in the second sub screen area 74 from the first sub screen area 72 whenever the tuning channel of the second synchronizer 48 is changed. ), It moves from the second subscreen area 74 to the third subscreen area 76 or from the third subscreen area 76 to the first subscreen area 72. In addition, the images displayed in the sub screen areas 72 to 76 are received from different channels than the image displayed in the main screen area 70 and the channels of the images displayed in the sub screen areas 72 to 76. Are also different. For example, if the image displayed in the main screen area 70 is a broadcast program received in channel 5, the images displayed in the three sub screen areas 72 to 76 are broadcast programs received in channels 7, channel 9, and channel 11, respectively. In addition, the image displayed in the sub picture area switched from the still picture to the moving picture has a broadcast program received on another channel changed from the previous channel. Further, when the key data for the first subscreen selection key 63, the second subscreen selection key 64, or the third subscreen selection key 65 flows in the POP screen display mode, the microcomputer The control unit 66 controls the first tuner 42 to read the channel data stored in the storage area of the memory 60 stored by the selected sub picture selection key and to tune the tuning frequency of the read channel data. The broadcast program displayed on the screen area is displayed on the main screen area 70.

5 is a flowchart illustrating a screen search method having a screen switching function according to an embodiment of the present invention performed by the microcomputer 66 shown in FIG. The flowchart shown in FIG. 5 is started by the microcomputer performing a kisscan at regular intervals.

In operation 78, the microcomputer 66 scans the key matrix 62 to check whether the scanned key data exists. If there is the key data scanned in the 78th step, the microcomputer 66 determines whether the POP mode selection key is examined by checking the logical value of the scanned key data (step 80). If the key scanned in the step 80 is the POP mode selection key, the microcomputer 66 sets the POP mode by setting the POP mode flag allocated in the register in the register to 1 (step 82). Channel tuning data representing another channel is applied to the two tuners 42 and 48 (step 84). After performing step 84, the microcomputer 66 applies a POP control signal to the sub picture processing unit 52 and the aspect ratio conversion unit 57, and provides 2-bit position data for specifying a sub picture area to be displayed on the moving image. It supplies to the sub picture processing unit 52 (step 86). At this time, the sub picture processing unit 52 generates three sub picture color signals according to the POP control signal from the microcomputer 60, and also corresponds to the logical value of the positioning data among the three frame memories in the sub computer. The frame memory compresses the video signal from the second intermediate frequency processing section 50 to generate a sub-screen color signal having a moving picture. The aspect ratio converting unit 54 mixes the sub-screen color signals from the sub-screen processing unit 52 so as not to overlap with the main-screen signal from the main screen processing unit 46. After performing step 86, the microcomputer 66 stores the channel tuning data applied to the second tuner 48 in the storage area of the memory 60 corresponding to the logical value of the positioning data of the memory. The flag is set to 1 to drive a timer counter embedded therein (step 88). On the other hand, if there is no key data scanned in step 78, the microcomputer 66 checks whether the POP mode flag is set to 1 to determine whether it is currently in the POP mode (step 90).

In step 90, the microcomputer 66 adds one value of the timer counter embedded therein in step 90 (step 92). After performing steps 92 and 88, the microcomputer 66 determines whether a predetermined time has elapsed by checking whether the value counted to the timer counter is N (step 94). When the value of the timer counter equals the predetermined number N in step 94, the microcomputer 66 stores the channel tuning data applied to the second tuner 48 and the channel tuning data stored in the memory 60. The broadcast program of the channel tuned by the second tuner 48 is changed by changing to channel tuning data for another channel (step 96). Then, by increasing the value of the positioning data applied to the sub screen processing unit 52, the sub screen area where the moving image is to be displayed is changed from the first sub screen area 72 shown in FIG. In step 98, the second sub-screen area 74 is switched to the third sub-screen area 72 (step 98). After performing step 98, the microcomputer 66 changes the channel tuning data instead of the channel tuning data stored in the storage area of the memory 60 corresponding to the sub picture area where the moving image is displayed, that is, the logical value of the positioning data. Data is stored, the value of the timer counter in the device is initialized to 0, and the on-screen text signal having the channel number corresponding to the changed channel tuning data is supplied to the color signal switching unit 56 (step 100).

If the key data scanned in step 80 is not the POP mode selection key, the microcomputer 66 checks whether the scanned key data is the sub picture selection key or the POP mode release key (steps 102 and 118). If it is determined in step 102 that the scanned key is the sub-screen selection key, the microcomputer 66 checks whether one POP mode flag assigned to a register in the register is set and determines whether it is currently in POP mode (104). step). If it is determined in step 104 that the present invention is in the POP mode, the microcomputer 66 determines whether the scanned key data is the first sub-screen selection key 63 or the second sub-screen selection key 64 ( Steps 106 and 108). If it is determined in step 106 that the scanned key data is the first sub-screen selection key, the microcomputer 66 reads the channel tuning data for the first sub-screen stored in the memory 60 (110). step). If it is determined in step 108 that the scanned key data is the second sub-screen selection key, the microcomputer 66 reads out the channel tuning data for the second sub-screen stored in the memory 60 ( Step 112). In addition, when the scanned key data is different from the first and second sub screen selection keys 63 and 64 in steps 106 and 108, the scanned key data may be a third sub screen selection key ( 65, the channel tuning data for the third sub picture stored in the memory 60 is read (step 114). After step 110, step 112 or step 114, the microcomputer 66 applies the read channel tuning data to the first tuner 42 so that the broadcast program being displayed on the sub-screen selected by the viewer is the main screen area. In operation 70, it is displayed on (70).

In addition, when the key data scanned in step 118 is determined to be the POP mode release key, the microcomputer 66 resets the POP mode flag and the timer counter flag in the self to release the POP mode, and then the sub-screen processing unit. (52) and the supply of the POP control signal and the positioning data being supplied to the aspect ratio conversion section 54 are stopped (step 120). If it is determined in step 118 that the scanned key data is different from the POP mode release key, a command corresponding to the scanned key data is executed (step 112).

As described above, the present invention stores the channel data of the broadcast program displayed in the sub picture area in the memory, and when the sub picture is selected so that the viewer can select the sub picture, the viewer selects the tuning channel of the main picture synchronizer. By changing the channel data of the memory for the screen, it is possible to switch and display the broadcast program displayed on the sub screen to the main screen area. Due to the above advantages, the present invention has the advantage that the user can switch the desired broadcast program displayed on the sub-screen to the main screen area when the screen search.

Claims (4)

First tuning means for tuning an intermediate frequency signal loaded with a broadcast program from a high frequency signal received through an aerial line, and main picture processing means for detecting a video signal for main screen from an intermediate frequency signal from the first tuning means. And a second tuning means for tuning an intermediate frequency signal loaded with a broadcast program from the high frequency signal received through the aerial line, and one auxiliary screen having a moving picture by detecting and compressing the intermediate frequency signal from the second tuning means. Auxiliary picture processing means having at least two frame memories for generating at least one auxiliary picture video signal having a video signal and a still picture and a broadcast program different from the moving picture; and from the main picture processing means. Mixing the video signal and the video signal from the sub picture processing means so as not to overlap An aspect ratio converting means for storing the information, a memory for storing reception channel information of the sub-screen broadcasting programs, key input means having key switches for selecting the sub-screen, and a sub-display for displaying the broadcast program. Frame memory of the sub picture processing means for changing the tuning channel of the second tuning means to a channel different from the channel information stored in the memory to switch the screen at regular intervals and storing the image from the second tuning means. The sub-screen corresponding to the sub-screen selection key stored by the viewer in order to switch the data, and to store the changed channel information of the second tuning means in the memory and to move the broadcast program displayed on the sub-screen toward the main screen. Read received channel information of a program broadcast program from the memory and read the received Control means for changing a tuning channel of said first tuning means to tune a broadcast program of a null, generating on-screen text signals for channels and other text information, and converting the aspect ratio conversion of on-screen text signals from said control means; And a color signal switching means for mixing so as to overlap the video signal from the means. A process of introducing a screen search command, displaying a video signal of a broadcast program received by the first tuner on the main screen, and compressing the video signal of a broadcast program received by the second tuner by at least two frame memories; At least two video signals having one video signal, a still picture and one or more video signals having a broadcast program different from the video signals of the moving picture, and at least two or more video signals generated not overlapping with the main picture Changing the tuning channel of the second tuner and storing the video signal received by the second tuner in order to change the broadcasting program and the display position of the video signal of the sub-screen moving picture at regular intervals. Switching at least two frame memories and storing the changed tuning channel information in the memory; Inputting a screen selection command, reading the reception channel information on the subscreen selected by the subscreen selection command from a memory, and tuning channels of the first tuner to tune the broadcast program of the read channel Channel search method of an optical screen television receiver having a screen switching function, characterized in that it comprises a process of switching. The optical screen television receiver having a screen switching function according to claim 2, wherein the sub-screen selection command input process includes determining whether a current channel search screen is displayed when the sub-screen selection command is input. How to navigate the channel. 4. The channel search of an optical screen television set having a screen switching function according to claim 3, further comprising a step of inputting a channel search disassembly command and a process of stopping display of a video signal of a broadcast program of an auxiliary screen. Way.