KR950010885B1 - Broadcasting formula channel changing apparatus - Google Patents

Abstract

The circuit is for tuning a channel which sends HDTV signal corresponding to a conventional NTSC channel. The circuit includes a signal type detector for discriminating that the broadcasting signal is HDTV signal or NTSC signal, a memory for storing channels on a specific area according to signal types, and a microprocessor for reading channel data from the memory according to signal type.

Description

Broadcasting Channel Switching Device

1 is a block diagram showing a broadcast channel switching apparatus according to a preferred embodiment of the present invention.

FIG. 2 is a detailed view of a second synchronous detector in the apparatus of FIG.

3 is a flow chart for explaining the operation of the microcomputer in the apparatus of FIG.

* Explanation of symbols for main parts of the drawings

11: control panel 12: micom

13: tuner 14,15: demodulator

16,17: Sync detector 18: Skip memory

19: display unit SR: sea register

NOR: Negative Logic Gate

The present invention relates to a broadcasting channel switching device, and more particularly, to a broadcasting channel switching device that switches to a broadcasting channel corresponding to a broadcasting channel of a reception channel so that a broadcasting channel having a better image quality can be selected for the same program. It is about.

In general, the conventional TV has a problem that the presence of the image displayed on the screen lacks. Thus, in recent years, high-definition TV broadcasting methods have been proposed to improve the realism of images. In particular, the proposed High Definition Television (HDTV) broadcasting method is composed of a method having compatibility with existing TV broadcasting methods such as NTSC broadcasting method. Therefore, the existing television signal can be displayed by a high definition television (HDTV) receiver. In order to receive an existing television signal to a receiver of a high definition television, a high definition television signal is transmitted through one channel, and the existing television signal is transmitted through another channel. Here, the existing television signal received by the receiver of the high definition television is displayed on the screen like the video signal of the high definition television broadcasting system. In this way, when high-definition television systems are prevalent in many homes and existing television systems are no longer used, channels for existing television signals can be used for other purposes. In general, the received channel of a television is stored in a specific storage device called a skip memory. Skip memory is mostly used in home appliances, and in the case of a television, it refers to a place where an effective channel number is stored. For example, pressing the channel up key on channel 7 stores only the channel with the broadcast station to change to channel 9 rather than channel 8. Since the existing high definition television system has compatibility between the existing method and the high definition method, the user needs to select a high definition channel corresponding to the existing method or a channel of the existing method corresponding to the high definition method.

Accordingly, an object of the present invention is to provide a broadcasting channel switching apparatus for selecting a broadcasting channel having a better image quality by switching between a conventional TV broadcasting channel and a high definition TV broadcasting channel for the same program.

The object of the present invention is to provide a video signal of a high definition TV broadcasting system and another video signal of a conventional TV broadcasting system input through a receiving channel on a screen. An operation unit for generating a key operation signal according to function selection, and a control signal according to the broadcasting method detected by the key operation signal and the method detection unit generated by the operation unit, and the key operation signal generated by the operation unit If it is a signal, the microcomputer reads the broadcasting channel corresponding to the selected channel of the broadcasting method from the memory, and the control signal generated by the key operation signal according to the channel selection in the microcomputer or the channel read from the memory is applied. A tuner that tunes a video signal of a channel and a video signal of a channel tuned by the tuner are high-definition TVs. The broadcast method detection unit for detecting whether the transmission method or the existing TV broadcasting method and outputs to the micom, and stores the channels in each area according to the broadcast method, the key operation signal according to the function selection and the detected broadcast method in the micom And a display unit for displaying a video signal of a channel selected by the tuner and a function selected by the operation unit on a screen by receiving a control signal generated by the control signal and performing a storing and reading operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a broadcast channel switching apparatus according to the present invention. As shown, the apparatus of the present invention includes an operation unit 11 for generating a key operation signal Skey according to channel selection for selecting a desired broadcast channel and function selection for selecting a desired function for the selected channel, and operation unit 11. And a microcomputer 12 for controlling channel channel selection in accordance with the key operation signal Skey generated by the < RTI ID = 0.0 > The channel switching device of the present invention also includes a tuner 13, first and second demodulators 14 and 15 for receiving and demodulating a signal of a selected channel through the tuner 13, and a first and second demodulator ( And a first and second synchronous detectors 16 and 17 for receiving the demodulated signals 14 and 15 and detecting the synchronization signals SD ₁ and SD ₂ . The signal output terminals of the first and second synchronous detectors 16 and 17 are connected to the microcomputer 12 that receives the synchronization signals SD ₁ and SD ₂ and determines a broadcast method of the video signal of the selected channel. The microcomputer 12 stores channels in a separate area according to a broadcasting method, and generates a predetermined signal generated according to a key operation signal Skey according to the channel selection of the operation unit 11 and the function selection for the selected channel from the microcomputer 12. Data (D _CH ) and clock (CLK) and enable signals ( ), A skip memory 18 for storing and reading the data is connected. The microcomputer 12 also includes a display unit 19 for displaying on the screen a video signal of a channel selected by the tuner 13 and a function mode currently performed.

The operation of the broadcast channel switching apparatus of the present invention configured as described above will be described in more detail with reference to FIGS. 2 to 3.

In FIG. 1, according to the channel selection signal Skey transmitted from the operation unit 11 to the microcomputer 12, the microcomputer 12 selects one channel through the tuner 13 so as to select data D _S corresponding to the selected channel. ) And a clock enable signal indicating that the clock signal CLK and the two signals are enabled signals. To the tuner 13). Select channel correspondence data (D _S ), clock signal (CLK), and chip enable signal supplied from the microcomputer 12 The tuner 13 tunes the broadcast signal for one desired channel according to the frequency of the radio wave received through the antenna. The video signal of the channel selected by the tuner 13 is simultaneously supplied to the first demodulator 14 and the second demodulator 15. If the video signal supplied from the tuner 13 is a conventional TV broadcast signal, the video signal is normally demodulated by the first demodulator 14. On the other hand, if the video signal is a high definition TV broadcast system, it is normally demodulated by the second demodulator 15. If the reception channel is a conventional channel, the first synchronous detector 16 detects the synchronization signal SD ₁ from the demodulation signal supplied from the first demodulator 14. On the contrary, if the reception channel is a high-definition TV broadcasting channel, the first motion detector 17 detects the synchronization signal SD ₂ from the demodulation signal supplied from the second demodulator 15.

FIG. 2 is a detailed view of the second synchronous detector 17 in the apparatus of FIG.

In FIG. 2, a video signal of a high definition TV broadcasting system demodulated by the second demodulator 15 and having a data bit string form is supplied to a shift register SR. The data bit strings D7 to D0 stored in the syst register SR and data representing a specific sync pattern are subjected to an exclusive OR operation for each bit through exclusive oragates XOR. The result of each operation is negated and logically negated through an NOR. If the data stored in the syst register SR has the same value as that of the synchronization pattern, the result of logical operation of the two data bit streams in the order of exclusive OR and negative logic sum is "1". If the result value is "1", the second synchronous detector 17 outputs the data stored in the syst register SR at that time as the detected synchronization signal SD2.

In this manner, the synchronous detection signal generated from the first synchronous detector 16 or the second synchronous detector 17 is input to the microcomputer 12. The microcomputer 12 examines the input synchronization signals SD ₁ and SD ₂ to determine the broadcasting method of the selected channel, and then the data D _CH according to the key operation signal Skey according to the function selection applied from the operation unit 11. ) And clock (CLK) and enable signals Is generated and supplied to the skip memory 18. The skip memory 18 is divided into an area for storing channels of a conventional TV broadcasting system and an area for storing channels of a high definition TV broadcasting system. Here, a flowchart of the microcomputer 12 operating according to the key operation signal Skey according to the function selection is shown in FIG.

3 shows a flowchart of the microcomputer 12 that operates in response to the key operation signal of the operation unit 11 in the apparatus of FIG.

In FIG. 3, a preset key signal must first be applied prior to a key operation for changing the contents in the skip memory 18. FIG. The preset key is a toggle key signal that protects the setting information. For example, when a user has a hard time setting a channel, they often mess up channels set by children or strangers, so it is checked whether the preset key is authorized before performing any key operation. Step 1). If the preset key is applied, it is checked whether the value is "1" (step 2). When the preset value is "1", that is, when the preset key signal is applied in the preset mode state, the preset value is changed to "0" (step 3), and the preset mode display is turned off. After step 4 (step 4), the process returns to step 1 and repeats the steps. If the preset value is not "1", that is, if the preset key signal is applied in a state other than the preset mode, change the preset value to "1" (step 5), and turn on the preset mode display. After (ON) (step 6), go back to step 1 and repeat the step. It is checked whether the preset key signal is applied (step 1), and if the preset key is not applied, it is checked whether the preset value is "1" (step 7). If the preset value is not " 1 ", i.e., it is not in the preset mode, it is checked whether or not the key operation signal Skey corresponding to the broadcast mode switching function selection is applied from the operation unit 11 (step 8). If the key operation signal Skey applied from the operation unit 11 is not the key operation signal Skey according to the broadcast mode switching function selection, the microcomputer 12 returns to the first step and repeats the steps. If the key operation signal Skey applied from the operation unit 11 is a key operation signal Skey according to the broadcast mode switching function selection, the microcomputer 12 has a key structure signal Skey different from the channel selection previously applied from the operation unit 11. In step 9, it is checked whether the channel selected by the method is a conventional TV broadcasting method.

If the broadcasting method of the selected channel is a conventional TV broadcasting method, the microcomputer 12 reads the corresponding channel of the selected channel stored in the channel storage area of the high-definition TV broadcasting method of the skip memory 18, and tunes the damage signal for the read channel. After selecting through step 13 (step 10), the process returns to step 1 and repeats the steps. The video signal of the channel selected by the tuner 13 is displayed on the screen by the display unit 19. If the broadcasting method of the selected channel is not the conventional TV broadcasting method but the high definition TV broadcasting method, the microcomputer 12 reads the corresponding channel of the selected channel stored in the channel storage area of the existing TV broadcasting method of the skip memory 18, and reads the channel. After selecting the room signal for the tuner 13 (step 11), the process returns to the first step and repeats the step. The video signal of the channel selected by the tuner 13 is displayed on the screen by the display unit 19. As a result of checking whether the preset value is "1" while the preset key is not applied (step 7), if the preset value is "1", that is, the preset key is applied immediately before the preset modine state In step 12, it is checked whether the key operation signal Skey corresponding to the channel addition function selection is applied from the operation unit 11 (step 12). If the key operation signal Skey applied from the operation unit 11 is a key operation signal Skey according to the channel addition function selection, the microcomputer 12 receives the key operation signal Skey according to the channel selection previously applied from the operation unit 11. It is checked whether the broadcast method of the channel selected by the conventional TV broadcast method (step 13). If the broadcasting method of the selected channel is the conventional TV broadcasting method, the microcomputer 12 additionally stores the selected channel in the channel storage area of the existing TV broadcasting method of the skip memory 18 (step 14), and indicates that the channel addition mode is in the state of adding channel. The display unit 19 displays on the screen (step 16) and returns to the first step and repeats the steps.

If the broadcast method of the selected channel is not a conventional TV broadcast method but a high-definition TV broadcast method, the high-definition TV broadcast method of the skip memory 18 additionally stores the selected channel in the channel storage area (step 15), The display unit 19 displays the state of the channel addition mode on the screen (step 16), and returns to the first step and repeats the step. If the key operation signal Skey applied from the operation unit 11 is not the key operation signal Skey according to the channel addition function selection, it is checked whether or not the key operation signal Skey according to the channel deletion function selection (step 17). If the key operation signal Skey applied from the operation unit 11 is a key operation signal Skey according to the channel deletion function selection, the microcomputer 12 receives the key operation signal Skey according to the channel selection previously applied from the operation unit 11. In step 18, it is checked whether the broadcast method of the selected channel is the existing TV broadcast method. If the selected channel is a conventional TV broadcasting method, the microcomputer 12 deletes the selected channel stored in the channel storage area of the existing TV broadcasting method of the skip memory 18 (step 19), and the channel The display unit 19 displays the state of the deletion mode on the screen (step 21), and returns to the first step and repeats the step. If the broadcasting method of the selected channel is not the conventional TV broadcasting method but the high definition TV broadcasting method, the microcomputer 12 deletes the selected channel stored in the channel storage area of the high definition TV broadcasting method of the skip memory 18 (step 20). The display unit 19 displays the state of the channel deletion mode on the screen (step 21), and returns to the first step and repeats the step. In addition, the microcomputer 12 accesses for storing and reading in the skip memory 18 when the key operation signal Skey applied from the operation unit 11 is not the key operation signal Skey according to the channel deletion function selection. Check whether it is a key operation signal (Skey) according to the position increase function selection (step 22). If the key operation signal Skey applied from the operation unit 11 is the key operation signal 2 according to the position increase function selection of the skip memory 18, the microcomputer 12 returns to the currently allocated address of the skip memory 18. 1 "is added to increase the current position of the skip memory 18 (step 23), and the process returns to the first step and repeats the step.

If the key operation signal Skey applied from the operation unit 11 is not the key operation signal Skey according to the position increase function selection of the skip memory 18, the microcomputer 12 operates the key operation signal Skey according to the position reduction function selection. (Step 24). If the key operation signal Skey applied from the operation unit 11 is a key operation signal Skey according to the position reduction function selection of the skip memory 18, the microcomputer 12 selects " Change the position by subtracting 1 "(step 25), and return to the first step and repeat the step. If the key operation signal Skey applied from the operation unit 11 is not the key operation signal Skey according to the position reducing function selection of the skip memory 18, the microcomputer 12 operates the key operation signal according to the channel up / down function selection. (Skey) is checked (step 26). If the key operation signal applied from the operation unit 11 is not the key operation signal Skey according to the channel up / down function selection, the microcomputer 12 returns to the first step and repeats the step. If the key operation signal applied from the operation unit 11 is a key operation signal Skey according to channel up to channel down function selection, the microcomputer 12 receives a key operation signal Skey according to channel selection previously applied from the operation unit 11. The channel selected by the " read " the next valid channel or the previous valid channel from the skip memory 18, selects the broadcast signal for the read channel through the tuner 13 (step 10), and then returns to the first step. Repeat The video signal of the channel selected by the tuner 13 is displayed on the screen by the display unit 19.

As described above, the broadcast channel switching apparatus according to the present invention by switching the broadcast method to the channel of the high-definition TV broadcasting method corresponding to the existing TV broadcasting method or the channel of the existing TV broadcasting method corresponding to the high-definition TV broadcasting method. By tuning, not only the existing TV broadcasting system and high definition TV broadcasting system can be used interchangeably, but also the user can select and watch a broadcasting channel of better image quality for the same program, thereby providing convenience to user channel selection. Moreover, it is expected to be widely used in industrial applications because it can be extended to not only televisions (TVs) but also devices such as video cassette recorders (VCRs).

Claims (8)

A video device capable of displaying one video signal of a high definition TV broadcast method and another video signal of a conventional TV broadcast method input through a reception channel, wherein a key operation signal according to channel selection and function selection for a selected channel Operation unit for generating; The control scene is generated according to the key operation signal generated by the operation unit and the broadcast method detected by the method detection unit, and if the key operation signal generated by the operation unit is a broadcast method switching function selection signal, a broadcast method corresponding to the selected channel of the detected broadcast method A microcomputer that reads channels from the memory; A tuner which receives a control signal generated by a key operation signal according to a channel selection or a channel read from a memory in the microcomputer and tunes an image signal of the channel; A broadcast method detecting unit for detecting whether a video signal of a channel selected by the tuner is a high definition TV broadcast method or an existing TV broadcast method and outputting the detected video signal to the microcomputer; A memory configured to store channels in respective areas according to a broadcast method, and to receive and store a key operation signal according to a function selection and a control signal generated by a detected broadcast method in the microcomputer to perform storage and reading operations; And a display unit for displaying a video signal of a channel selected by the tuner and a function selected by the operation unit on a screen. The apparatus of claim 1, wherein the broadcasting method detecting unit comprises: a first synchronous detector for detecting a synchronizing signal by an existing TV broadcasting method from the input video signal; And a second synchronous detector for detecting a synchronous signal by a high definition TV broadcasting system from the input video signal. 3. The apparatus of claim 2, wherein the second synchronous detector comprises: a shift register configured to receive and store the video signal of the high definition TV broadcast system in the form of a data bit string; A plurality of exclusive orgates for exclusively ordering each bit of the data bit string stored in the shift register and each bit of a predetermined synchronization pattern in corresponding bit units; And a negative logic gate configured to negatively sum output values of the plurality of exclusive orifices to detect a synchronization signal. The broadcasting method channel storage area of the memory according to claim 1, wherein the micom is a broadcasting method that detects a channel selected by the channel selection signal previously generated by the operation unit when the key operation signal generated by the operation unit is a channel addition function selection signal. Broadcasting channel switching device characterized in that the additional storage. The broadcasting method channel storage area of the memory according to claim 1, wherein the micom detects a channel selected by the channel selection signal generated before the operation unit when the key operation signal generated by the operation unit is a channel deletion function selection signal. Broadcast channel switching device characterized in that the deletion from. The broadcasting channel according to claim 1, wherein the micom increases the current position indicating the memory if the key operation signal generated by the operation unit is a position increase function selection signal for storing and reading the memory. Switching device. The broadcasting channel according to claim 1, wherein the micom reduces the current position indicating the memory if the key operation signal generated by the operation unit is a position reduction function selection signal for storing and reading the memory. Switching device. The method of claim 1, wherein the microcomputer reads from the memory the next effective channel to the previous effective channel of the channel selected by the channel selection signal generated earlier in the operation unit if the key operation signal generated in the operation unit is a channel up to channel down function selection signal. Broadcasting channel switching device characterized in that the shipment.