KR19980041422A - Television receiver with automatic channel search function using sub picture - Google Patents

Abstract

The present invention relates to a television receiver having a channel automatic search function using a sub-screen, which is capable of executing an automatic channel search function through a sub-screen while continuously watching a channel currently being watched through the main screen. A key input unit for inputting an execution command of a search function, a tuner for executing a broadcasting station for a sub-screen channel according to a predetermined control signal, a PIP processing unit for outputting a sub-screen image based on the broadcast signal selected by the tuner; A sync signal detector for separating and detecting a sync signal from the composite video signal of the channel tuned by the tuner, and a search channel storage unit for storing channel data of the regular broadcast channel searched based on whether the sync signal is detected by the sync signal detector. And drive the tuner when an automatic channel search execution command is input through the key input unit. A control unit for controlling the sequential channel search for the entire broadcasting frequency is characterized in that it is configured to include.

Description

Television receiver with automatic channel search function using sub picture

The present invention relates to a two-tuner television receiver equipped with a sub picture function, and in particular, a channel automatically using a sub picture which enables an automatic channel search function to be executed through a sub picture while continuously watching a channel currently being watched through the main picture. A television receiver having a search function.

Recently, some commercially available television receivers (hereinafter referred to as TV receivers) have adopted a sub picture function that allows one screen to be divided and output two or more channel programs simultaneously. It shows the internal structure of the TV receiver equipped with a screen function.

In Fig. 1, reference numeral 22 denotes a first tuner TUNER for main picture channel selection, 23 denotes a first IF amplifier for amplifying an intermediate frequency (IF) signal output from the first tuner 22, and First P / S separation, for example, comprising a surface acoustic wave filter (SAW FILTER) for separating the IF signal output from the first IF amplifier section 23 into an image intermediate frequency signal PIF and an audio intermediate frequency signal SIF, respectively. 25 is a first video signal detector for detecting a video signal from the video intermediate frequency signal PIF1 separated and output from the first P / S separator 24, and 26 is a first P / S separation. The first voice signal detector is for detecting the voice signal from the voice intermediate frequency signal SIF1 which is separately output from the unit 24.

On the other hand, reference numeral 32 is a second tuner for picture in picture (PIP) channel selection, 33 is a second IF amplifying unit for amplifying the intermediate frequency signal output from the second tuner 32, 34 is For example, the surface acoustic wave, such as the first P / S separation unit 24, that separates the IF signal output from the second IF amplifier 33 into an image intermediate frequency signal PIF and an audio intermediate frequency signal SIF, respectively. The second P / S separators 35 and 36 each made of a filter detect a video signal from the video / audio intermediate frequency signals PIF2 and SIF2 separated and output from the second P / S separator 34, respectively. 2 is a video signal detector and a second audio signal detector for detecting an audio signal.

In addition, reference numeral 7 is a remote control device for remotely controlling the overall operation of the device, 8 is a receiving unit for receiving the infrared signal transmitted from the remote control device 7 and converting it into an electrical signal, 9 is this receiving unit ( A microprocessor serving as a control unit for outputting a predetermined clock signal CL and a data signal DATA for controlling the entire apparatus in accordance with a contracted code signal output from 8).

Reference numeral 20 denotes a composite video signal output from the first and second video signal detectors 25 and 35 and the first and second audio signals according to a predetermined control signal from the microprocessor 9. A switching unit for selectively switching the audio signal output from the detectors 26 and 36, respectively, reference numeral 28 denotes a voice for the main screen output from the switching unit 20 under the control of the microprocessor 90 A first audio processing unit for processing a signal, 29 is an audio amplification unit for amplifying the audio signal processed by the first audio processing unit 28 to output to the speaker 30 connected to the rear end, 27 is the switching unit 20 A second audio processing unit for processing the audio signal for the sub-screen output from the output through the headphone jack (not shown) installed in the TV main body.

On the other hand, the reference numeral 31 receives an image signal selected and output as the sub-screen image signal from the switching unit 20 based on this R ', G', B '(Red, Green, Blue) for generating the sub-screen And a PIP processing unit for outputting a blanking signal Y ', and 11 denotes a main composite image signal output from the switching unit 20 and R', G ', B output from the PIP processing unit 31. An image processor for outputting R, G, B, and luminance signals Y for main and sub picture output based on 'and blanking signal Y', and 12 denotes R, A CRT driving unit for driving the CRT 13 on the basis of G, B and the luminance signal (Y).

That is, according to the device having the above-described configuration, when the user selects the sub picture function through the remote control device 7, the microprocessor 9 controls the first tuner 22 to output a channel to be output to the main screen. In addition to tuning, the channel to be output to the sub-screen is tuned through the second tuner 32. The main screen video signal tuned by the first tuner 22 is inputted by the image processor 11 and the second. The sub-screen video signals tuned by the tuner 32 are processed by the PIP processing unit 31, respectively, so that the main screen video and the sub-screen video on the CRT 13 screen are simultaneously output on one screen at a predetermined ratio. do.

On the other hand, if the automatic channel search function is executed in a conventional television receiver composed of a single tuner, only one tuner is used for broadcasting tuning, and thus the program of the channel being watched until the channel search operation performed by the tuner is finished. Since there is a problem that can not be seen, if the automatic channel search function is realized using the sub-screen function provided in the above-described two-tuner TV, the channel search function can be normally executed without disturbing the broadcasting.

The present invention has been made in view of the above circumstances, and the user can watch the broadcasting of the channel currently being viewed through the main screen while executing the automatic channel search function through the sub-screen so that the user's broadcasting can be watched due to the channel search operation. An object of the present invention is to provide a television receiver having an automatic channel search function using a sub-screen created without being disturbed.

1 is a block diagram showing the internal structure of a conventional general sub-screen providing function television receiver.

Figure 2 is a block diagram showing the internal configuration of a television receiver having a channel automatic search function using a sub-screen according to an embodiment of the present invention.

3 is a diagram illustrating an output state of a predetermined guide screen for guiding channel search results.

*** Explanation of symbols for main parts of drawing ***

1: antenna 7,40: remote control device

8,41: receiver 9, 45: microprocessor

11: Image Processing Unit 12: CRT Driver

13: CRT 20: switching unit

22: first tuner 23: first IF amplifier

24: first P / S separation unit 25: first video signal detector

26: first voice signal detector 27: second voice processor

28: first voice processing unit 29: voice amplifier

30: speaker 31: PIP processing unit

32: second tuner 33: second IF amplifier

34: second P / S separator 35: second video signal detector

36: second voice signal detector 42: channel memory

43: second synchronization signal detection unit 44: search channel storage unit

46: OSD pattern storage unit 47: OSD generation unit

A television receiver having an automatic channel search function according to the present invention for realizing the above object includes a key input unit for inputting an execution command of the automatic channel search function through a sub-screen, and a broadcasting channel for the sub-screen channel according to a predetermined control signal. A tuner which executes a signal, a PIP processing unit for outputting a sub-screen image based on the broadcast signal selected by the tuner, and a synchronization signal detector for separating and detecting a synchronization signal from the composite video signal of the channel selected by the tuner. Search channel storage unit for storing the channel data of the normal broadcast channel retrieved based on the detection of the synchronization signal by the signal detection unit, and when the automatic channel search execution command is input through the key input unit is driven to control the tuner overall broadcast frequency And a controller for controlling the sequential channel search to be executed. do.

That is, according to the present invention having the above-described configuration, by executing an automatic channel search function using a separate tuner for sub-screen channel selection, it is possible to perform channel search without disturbing TV viewing.

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

FIG. 2 is a block diagram of a television receiver having an automatic channel search function using a sub-screen according to an embodiment of the present invention, in which the same reference numerals are used for components that perform substantially the same functions as those shown in FIG. The detailed description thereof will be omitted.

In FIG. 2, reference numeral 40 denotes a remote control device additionally provided with an execution key for the automatic channel search function through the sub-screen, and 41 receives an infrared signal transmitted from the remote control device 40 and converts it into an electrical code signal. The receiving unit 45 for outputting is a microprocessor as a control unit for controlling all operations for the sub picture channel search function based on the code signal applied from the receiving unit 41.

Also, reference numeral 42 is a channel memory for storing channel tuning data for a broadcasting station, and 43 is for separating and detecting a synchronization signal from a composite video signal of a sub-screen video output from the second video signal detector 35. The second sync signal detector 44 is a search channel storage for storing channel data of the normal broadcast channel searched based on whether the sync signal is detected.

In addition, reference numeral 46 denotes an OSD pattern storage unit for storing predetermined OSD pattern data for guiding a user to a result searched by an automatic channel search function, and 47 denotes an OSD pattern storage unit under control of the microprocessor 45. 46 is an OSD generator which outputs color tone (R, G, B) and blanking signal (Y) for outputting a predetermined guide subtitle for the channel search result based on the data stored in 46).

Next, the operation of the device having the above configuration will be described.

When the user selects a predetermined function key (not shown) provided in the remote control device 40 during the TV viewing, the microprocessor 45 controls the switching unit 20 and the PIP processing unit 31 to display the sub-screen output mode. At the same time, the second tuner 32 is controlled based on the channel data stored in the channel memory 42 to sequentially perform channel search from the low frequency broadcast frequency.

Meanwhile, at this time, the second synchronization signal detector 43 detects the synchronization signal from the composite video signal output from the second video signal detector 35 as the regular broadcast channel is tuned by the second tuner 32. Whenever the synchronization signal is detected, for example, a high level detection signal is output to the microprocessor 45.

Whenever a high level detection signal is applied from the second synchronizing signal detector 43, the microprocessor 45 registers and tunes presetting data of the channel currently tuned in the search channel storage 44. When the process is completed, the tuning frequency is gradually adjusted upward, and the search operation for the remaining signal broadcasting channel is continued.

On the other hand, while the channel signal is in progress, the signal-signaling channel searched every second through the sub-screen is intermittently output, so that the user can check the progress of the channel search at that time.

Thereafter, when the channel search operation is completed, the microprocessor 45 releases the sub-screen output mode and guides the search result to the OSD generator 47 based on the data registered in the search channel storage 44. The OSD generator 47 reads the data stored in the OSD pattern storage unit 46 according to the control signal applied from the microprocessor 45 to output a predetermined control signal for the image processor 11. Outputs a predetermined color tone signal (R, G, B) and a blanking signal (Y ') for outputting a search result guide subtitle. As a result, as shown in FIG. 3, a predetermined guide screen for guiding the channel search result is output through the CRT 13 screen, so that the user can check the search result.

That is, according to the embodiment, it is possible to realize a television receiver having an automatic channel search function using a sub-screen which enables the automatic channel search function to be executed through the sub-screen while continuing to watch the channel currently being viewed through the main screen.

On the other hand, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the technical gist of the present invention.

As described above, according to the present invention, by performing an automatic channel search function using a separate tuner for sub-screen channel selection, it is possible to perform channel search without disturbing TV viewing.

Claims (2)

A key input unit for inputting an execution command of a channel automatic search function through a sub-screen, A tuner for executing a broadcasting station for a sub picture channel according to a predetermined control signal, A PIP processing unit for outputting a sub-screen video based on the broadcast signal tuned by this tuner; A synchronization signal detector for separating and detecting a synchronization signal from the composite video signal of the channel tuned by the tuner; A retrieval channel storage unit for storing channel data of the normal broadcast channel retrieved on the basis of whether the synchronization signal detection unit detects the synchronization signal; When the automatic channel search execution command is input through the key input unit, the channel is automatically searched using the sub-screen, which includes a control unit for controlling the tuner to execute a sequential channel search for the entire broadcasting frequency. Television receiver with function. The automatic channel search using the sub-screen according to claim 1, further comprising an OSD generator for outputting a predetermined OSD subtitle pattern for guiding the automatic channel search execution result according to a predetermined control signal from the controller. Television receiver with function.