KR19990043329A - Display device of two broadcasting method by searching time of PIP television - Google Patents

Abstract

The present invention relates to a two-broadcast display device for each search time of a PIP television. After the search time is set after allocating the broadcast bands of SECAM-L and PAL-B / G to two tuners and setting the search time, The present invention relates to an apparatus for allowing two tuners to simultaneously search and output broadcast signals of a corresponding band. The present invention sets a tuner and a search band order for searching for high frequency signals of SECAM-L and PAL-B / G belonging to the VHF-L, VHF-H and UHF bands by using two tuners provided in the television. After setting the search time for searching in the second tuner of the tuner, if the counting time corresponds to the search time, the broadcast signal found in the main tuner unit is searched simultaneously in the order determined by the second tuner. While the main signal is displayed on the main screen, the broadcast signal searched by the sub-tuner unit is displayed on the sub screen, thereby providing a two-broadcast display device for each search time of the PIP television which has an effect of saving search time.

Description

Display device of two broadcasting system by searching time of PITV

The present invention relates to a two-broadcast display device for each search time of a PIP television. After the search time is set after allocating the broadcast bands of SECAM-L and PAL-B / G to two tuners and setting the search time, The present invention relates to an apparatus for allowing two tuners to simultaneously search and output broadcast signals of a corresponding band.

In general, in addition to the NTSC television broadcast system, it is divided into three types of NTSC system (NATIONAL TELEVISION SYSTEM COMMITTEE), PAL system (PHASE ALTERNATION BY LINE), and SECAM (SEQUENTIEL COULEURA MEMOIRE) according to the color system. Are classified into SYSTEM M, B / G, D / K, I, L, etc. The transmission method of the color difference signal according to the color system of the three systems is orthogonal to the I, Q color difference signal in the NTSC method. Π Amplitude modulates the color carrier of 3.579545MH _Z with / 2 phase modulation, and in the PAL method, the polarity of the color carrier is reversed by inverting the polarities of the RY and BY color difference signals for each scan line. Π Amplitude modulation of 4.43618MH _Z color carrier with / 2 phase modulation, and RY, BY color difference signal with two different color carriers F1 = 4.40625MH _Z, F2 = 4.25MHZ in line sequential method Sending.

In addition, NTSC and PAL-B / G systems use sub-modulation and FM modulation as video and audio modulation, while SECAM-L system uses positive and AM modulation, and the voice intermediate frequency is NTSC system. the 4.5MH _Z, PAL-B / G and SECAM systems 5.5MH _Z-L system is fixed to the _Z 6.5MH.

Here, a television receiver for receiving the broadcast signals of the SECAM-L and PAL-B / G through one tuner will be described with reference to FIG. 1.

First, the high frequency signal of SECAM-L (PAL-B / G) received from the antenna 10 is selected by the tuner unit 15, converted into an intermediate frequency signal, and output to the IF amplifier 20, and the IF After being amplified by the amplifier 20, the high frequency signal of the SECAM-L (PAL-B / G) is separated into a video signal and an audio signal by the image detector 50 and the voice detector 25, respectively. That is, the image signal of the SECAM-L (PAL-B / G signal) detected by the image detector 50 is amplified through the image amplifier 55 and then output to the Y / C separation unit 60. The Y / C separation unit 60 separates the color signal (C signal) and the luminance signal (Y signal) mixed in the video signal, and outputs them to the color demodulation unit 75 and the color signal output unit 65, respectively. do.

In addition, the color demodulator 75 receives a color signal (C signal) from the Y / C separation unit 60, synthesizes the burst signal, detects the color difference signal (RY, BY), and outputs the color signal. The color signal output unit 65 receives the luminance signal (Y signal) and the color difference signal (RY, BY) from the Y / C separation unit 60 and the color demodulation unit 75, respectively. After synthesis, an RGB signal that is a primary color signal is generated, amplified by a size necessary for output of the CRT 70, and output to the CRT 70.

Accordingly, the CRT 70 receives the RGB signal from the color signal output unit 65, deflects the output, and causes the three primary colors of red, green, and blue to overlap on the fluorescent screen so that the video signal transmitted from the broadcasting station is displayed. .

Meanwhile, the 6.5 MHz (SECAM-L) or 5.5 MHz (PAL-B / G) voice signal detected by the voice detector 25 is amplified by the voice intermediate frequency amplifier 30 and then FM detected. The low frequency audio signal is detected through the unit 35, and is amplified and output to a size sufficient to drive the speaker 45 via the low frequency amplifier 40.

However, in searching for the broadcast signals of SECAM-L and PAL-B / G as described above through a single tuner unit, the time required for long time and both signals are mixed to cause inconvenience in viewing. There is this.

Therefore, the present invention has been invented to solve the above problems, and an object of the present invention is to provide two tuners, allocating and ordering broadcast bands of SECAM-L and PAL-B / G, and simultaneously searching time. After the setting, when the search time has elapsed, the present invention provides a two-broadcast display device for each search time of a PIP television that simultaneously searches for and outputs a broadcast signal of a corresponding band in a predetermined order in two tuners.

1 is a block diagram illustrating an apparatus for separating and receiving broadcast bands of SECAM-L and PAL-B / G through a conventional tuner.

Figure 2 is a block diagram showing a two-broadcast display device for each search time of a PIP television according to the present invention.

Figure 3 is a flow chart illustrating a two-broadcast display device for each search time of a PIP television of the present invention.

* Explanation of symbols for main parts of the drawings

100: antenna 110: main tuner

120: IF amplifier 130: main A / V switching unit

140: voice intermediate frequency amplifier 150: FM detector

160: low frequency amplifier 170: speaker

180: Y / C separation unit 190: main IC

200: PIP signal processing unit 210: color signal output unit

220: CRT 230: sub tuner

240: sub A / V switching unit 250: memory unit

260: timer 270: microcomputer

281: PIP mode switching button 282: tuner selection button

283: search time setting button

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment for achieving the above object of the present invention.

2 is a block diagram showing a two-broadcast display device for each search time of a PIP television according to the present invention.

Referring to FIG. 2, the present invention provides a main tuner unit 110 and a sub-tuner unit 350 for receiving only a predetermined band of a SECAM-L or PAL-B / G high frequency signal and converting the same into an intermediate frequency signal. IF amplification unit 120 for amplifying the intermediate frequency signal output from the main tuner unit 110, and the video signal and the audio signal output from the IF amplification unit 120, Y / C separation unit 180 and the sound intermediate A main A / V switching unit 130 applied to the frequency amplifying unit 300 and a Y / C separation unit for receiving a video signal from the main A / V switching unit 130 and separating luminance and color signals; 180, a main IC 190 that receives a luminance signal and a color signal from the main A / V switching unit 130, generates a color difference signal, and outputs the color difference signal to the PIP signal processing unit 200, and the sub-tuner unit 230. After switching the video signal and the audio signal output from the sub-A / V switch to apply the video signal to the PIP signal processing unit 200 A PIP signal processor 200 for PIP-processing the color difference signal and the luminance signal applied from the main IC 190 and the image signal applied from the sub-A / V switching unit 240 together; A color signal output unit 210 for outputting the RGB signal and the sub-image signal, which are generated by combining the color difference signal and the luminance signal PIP-processed from the PIP signal processor 200, to the CRT 220, and the main A / V switching unit ( 130, an intermediate frequency amplification unit 140 receiving an audio signal from the audio signal, and an FM detection unit detecting a low frequency audio signal from the audio intermediate frequency signal output from the speech intermediate frequency amplifying unit 140. 150 and the low frequency amplification unit 160 and the main tuner 110 that are amplified to a magnitude sufficient to drive the speaker 170 by receiving a low frequency audio signal from the FM detector 150. ) And the sub-tuner unit 230, the remote controller 900 A microcomputer 270 for applying control signals to the PIP signal processing unit 200 and the memory unit 250 according to a signal generated from the signal, a timer 260 for displaying a current time on the outside of the television, and a search set by the user. A memory unit 250 for storing time, a PIP mode switching button 901, a tuner selecting button 282, and a searching time for respectively generating a PIP mode switching signal, a tuner selection signal, and a search time setting signal by a user's button manipulation; The remote controller 280 is provided with a setting button 283.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation according to an embodiment of the present invention.

First, when the user operates the PIP mode switch button 281 provided in the remote controller 280 to watch the broadcast programs of SECAM-L and PAL-B / G, the PIP mode switch from the remote controller 280 A signal is generated and received by a signal receiver (not shown) mounted on the television system, which is detected by the microcomputer 270, and the microcomputer 270 is tuned to the main tuner 110 and the sub-tuner 230. The control signal is applied to make it ready for receiving different broadcast signals.

Here, the user operates the tuner select button 282 to determine which tuner unit receives the high frequency signals of SECAM-L and PAL-B / G belonging to the VHF-L, VHF-H and UHF bands. By operating the tuner selection button 282, for example, the main tuner unit 110 receives high-frequency signals of SECAM-L and PAL-B / G belonging to the VHF-L and VHF-H bands, The sub-tuner 230 selects a broadcast signal to be displayed on the main screen and the sub screen of the CRT 220, such as to receive high-frequency signals of SECAM-L and PAL-B / G belonging to the UHF band.

In addition, the order in which the user operates the search time setting button 283 in the main tuner unit 110, for example, SECAM-L in the VHF-L band, PAL-B / G in the VHF-L band, The SECAM-L of the VHF-H band and the PAL-B / G of the VHF-H band and the search time are set, while the sub-tuner unit 230 searches for the sequence, for example, SECAM-L of the UHF band. When the PAL-B / G and the searched time of the UHF band are set, the microcomputer 270 applies a control signal to the main tuner 110 and the sub-tuner 230 to correspond to the corresponding VHF according to the set time. Allow high frequency signals of SECAM-L and PAL-B / G in the L, VHF-H and UHF bands to be searched.

After the order and time of searching in the main tuner unit 110 and the sub-tuner unit 230 are set as described above, when the time displayed on the timer 260 corresponds to the search time, the microcomputer 270 does this. Sensing and applying a tuning control signal to the main tuner 110 and the sub-tuner 230, the main tuner 110 is applied to the VHF-L band applied from the antenna 100 in a predetermined search order The high frequency signal of the SECAM-L to be converted into an intermediate frequency signal and output to the IF amplifier 120, the IF amplifier 120 amplifies the intermediate frequency signal, the main A / V switching unit 130 Will print to

In addition, the main A / V switching unit 130 outputs an image signal to the Y / C separation unit 180 among the intermediate frequency signals applied from the IF amplifier 120, while the audio signal is an audio intermediate frequency amplifier. The Y / C separation unit 180 separates the luminance signal and the color signal from the image signal and applies it to the main A / V switching unit 130 again.

That is, the main A / V switching unit 130 receives the luminance signal and the color signal from the Y / C separation unit 180, synthesizes the detected Burst signal, detects and amplifies the color difference signals RY and BY. To be output to the PIP signal processor 200.

On the other hand, after receiving the 6.5MHz voice signal from the main A / V switching unit 130, the voice intermediate frequency amplifier 140 amplifies and outputs to the FM detector 150 to detect the low frequency voice signal, Through the amplification process of the low frequency amplifier 160 is to be output to the speaker 170.

Similarly, the sub-tuner unit 230 receives the tuning control signal of the microcomputer 270 and first receives a high frequency signal of SECAM-L belonging to the UHF band received from the antenna 100 according to a predetermined order, and receives the high frequency signal as an intermediate frequency signal. After the conversion, the sub-A / V switching unit 240 outputs the sub-A / V switching unit 240 to the PIP signal processing unit 200 by processing the video signal in the high frequency signal.

Here, the PIP signal processing unit 200 allows the color difference signal and the luminance signal applied from the main IC 190 to be displayed on the main screen according to the control signal of the microcomputer 270, whereas the sub A / V switching unit 240 After the PIP signal is processed to be displayed on the sub screen, the video signal is output to the color signal output unit 210, and the color signal output unit 210 receives and synthesizes the luminance signal and the color difference signal. It generates an RGB signal, which is a signal, amplifies the signal as much as necessary for the output of the CRT 220, amplifies the PIP signal processed image signal, and outputs the amplified image signal to the CRT 220.

Accordingly, the CRT 220 causes the RGB signal of the SECAM-L output from the color signal output unit 210 to be displayed on the main screen, while the video signal of the SECAM-L PIP signal processed is displayed on the subscreen.

In addition, the high frequency signals of the SECAM-L of the VHF-L band and the SECAM-L of the UHF band are selected through the main tuner unit 110 and the sub-tuner unit 230 as described above. After being displayed on the screen, when the next search time set by the user has elapsed, the microcomputer 270 detects this and the PAL-B / G high frequency signal of the VHF-L band is detected through the main tuner unit 110. On the other hand, through the sub-tuner 230, a tuning control signal is applied to the PAL-B / G high frequency signal of the UHF band, respectively.

3 is a flowchart illustrating a two-broadcast display device for each search time of a PIP television according to the present invention, wherein a power-on switching step (S10) in which the power of the PIP television is switched on and the power-on switching step (S10) are shown. After the PIP mode switching step (S20) and the PIP mode switching step (S20) is switched to the PIP mode, the VHF-L, VHF-H and SECAM-L and PAL B / G to be searched A tuner selection step (S30) in which a tuner unit corresponding to the UHF band is selected (S30), a search time setting step (S40) in which a time for searching for a broadcast signal of each band is set through the tuner unit after the tuner selection step (S30), and After the search time is set in the search time setting step S40, it is determined whether the first time counting step S50 in which the time is counted and the time counted in the first time counting step S50 correspond to the search time. Search time determination step (S60), and the search time determination stage When the time counted in S60 corresponds to a search time, a search step S70 in which a high frequency signal of a corresponding broadcast band is searched through each tuner unit and a signal of the broadcast band searched in the search step S70 are output. The first time counting step in which the time is counted after the output step (S80) and the time counted in the search time determination step (S60) do not correspond to the search time and after the output is finished in the output step (S80). (S50) is made.

Hereinafter, with reference to the accompanying drawings will be described the operation after the tuner selection step (S30).

First, after the television is switched to the PIP mode, the user selects a tuner for searching the broadcast bands of SECAM-L and PAL-B / G by operating the tuner selector button 282 provided in the remote controller 280. By operating the search time setting button 283, it is possible to set the time for which the respective broadcast bands are searched.

That is, for example, the main tuner unit 110 has a high frequency signal of SECAM-L and PAL-B / G belonging to the UHF band in a constant time interval in the order of SECAM-L of the UHF band and PAL-B / G of the UHF band. Meanwhile, the sub-tuner 230 includes high-frequency signals of SECAM-L and PAL-B / G belonging to the VHF-L and VHF-H bands, and the SECAM-L and VHF-L bands of the VHF-L band. PAL-B / G, SECAM-L in the VHF-H band and PAL-B / G in the VHF-H band are set to be searched at a predetermined time interval.

After the search time is set as described above, the microcomputer 270 determines whether the time displayed on the timer 260 corresponds to the search time, and when the search time corresponds to the first search time, the main tuner unit 110 and the sub. The main tuner 110 converts the SECAM-L high frequency signal belonging to the UHF band into an intermediate frequency signal by applying a tuning control signal to the tuner 230, while the sub tuner 230 VHF-L. Search and process SECAM-L high frequency signals in the band.

In addition, the intermediate frequency signal converted by the main tuner unit 110 is output to the PIP signal processing unit 200 through the main A / V switching unit 130 through the Y / C separation and color processing process The voice signal is output to the speaker 170 after being demodulated and amplified.

On the other hand, the video signal output from the sub-tuner 230 is output to the PIP signal processing unit 200 via the sub-A / V switching unit 240.

Here, the PIP signal processing unit 200 performs PIP signal processing on the image signals applied from the main tuner 110 and the sub tuner 230 to be output to the main screen and the sub screen of the CRT 220.

After the first search time has elapsed and the broadcast signal of the searched band is output, the time is continuously counted, and when the next search time has elapsed, the main tuner unit 110 and the sub-tuner unit according to the predetermined search order. Signals of two bands are simultaneously detected and output through 230.

As described above, the present invention provides a tuner and search band order for searching for high frequency signals of SECAM-L and PAL-B / G belonging to the VHF-L, VHF-H, and UHF bands by using two tuners provided in a television. After setting the search time, the search time is performed in the second tuner, and if the counting time corresponds to the search time, the second tuner is searched in the same order and then searched in the main tuner unit The broadcast signal is displayed on the main screen of the CRT, while the broadcast signal found in the sub-tuner is displayed on the sub screen, thereby saving search time.

Claims (3)

In PIP television that can output different television broadcasting signals at the same time, First tuning means for tuning a broadcast channel to be watched by a broadcast signal received from the antenna 100; Second tuning means for receiving a signal of a broadcasting method different from the broadcast signal received by the first tuning means and tuning a broadcast channel to be watched; Storage means for storing a search time for each band of a broadcast signal received by the first and second tuning means; PIP signal processing means for PIP processing the video signal output from the first tuning means and the second tuning means; And a control means for simultaneously displaying a broadcast signal output through the first tuning means and the second tuning means on a screen of the television. The method of claim 1, wherein the control means selects a broadcast band and an order to be displayed on the main screen and the sub screen of the CRT 220, sets a search time, and then counts the time so that the search time is counted. If the elapsed time, the microcomputer 270 to apply the tuning control signal to the first tuning means and the second tuning means to search for and output the broadcast signal of the corresponding band designated by the user in order. Display device for two broadcasts per search time. The apparatus of claim 1, further comprising: a remote controller 280, which is provided with a PIP mode switching means, a tuner selecting means, and a searching time setting means, for remotely controlling the television. Type display device.