KR19990025632A - Synchronous signal information processing device for channel search of television - Google Patents

Abstract

According to the present invention, the synchronization signal information extracted from a predetermined broadcast channel in a television is stored in advance as the synchronization pattern information. Provided is a synchronization signal information processing apparatus for channel searching of a television, which enables an efficient processing.

To this end, according to the present invention, the luminance / color signal processing of the image signal processing unit 10 is performed by the synchronization information by the synchronization signal separated by the synchronization separating unit 16 from the television broadcasting signal of the predetermined broadcasting channel tuned by the tuner 2. In addition, in the television configured to perform deflection driving by the deflection circuit unit 18 and to be utilized as synchronization information for OSD signal processing of the OSD signal processing unit 34, separation by the synchronization separating unit 16 is performed. From the PLL circuit means 24 for PLL-processing the received synchronous signal, the synchronous signal memory means 26 for storing the synchronous signal information PLL-processed by the PLL circuit means 24, and the synchronous separator 16; In addition to performing switching switching for applying a synchronization signal to the PLL circuit means 24, the image of the synchronization signal information stored in the synchronization signal memory means 26 is searched for when the tuner 2 searches for a broadcast-free channel. Signal processor 10 The first and second switching switching means 22 and 28 for switching switching for supplying to the deflection circuit portion 18 and the OSD signal processing portion 34, and the tuner 2 when tuning the broadcast channel. Switching control of one switching switching means 22 causes the synchronization signal information to be stored in the synchronization signal memory means 26 and the tuner 2 according to a search command of the broadcast-free channel of the function setting section 30. The second signal is supplied to supply the synchronization signal information stored in the synchronization signal memory means 26 to the image signal processing unit 10, the deflection circuit unit 18, and the OSD signal processing unit 34, respectively, when searching for a broadcast-free channel through the second channel. It is characterized in that it comprises a control means 32 for switching the switching switching means 28.

Description

Synchronous signal information processing device for channel search of television

The present invention relates to a synchronization signal information processing apparatus for channel search of a television, and more particularly, to display a screen for channel search for a non-broadcast channel in a state in which a synchronization signal for a broadcast channel is previously stored as signal pattern information in a television. A synchronization signal information processing apparatus for channel search of a television which can be utilized as synchronization information for processing.

Nowadays, TVs which are generally used are tuned to desired channels in a multi-channel television broadcast signal transmitted in the form of airwaves through a tuner and reproduced as a scanning screen on a CRT screen through intermediate frequency amplification processing, luminance signal processing, and color signal processing. To be.

In addition, such a television separates the vertical / horizontal synchronization signals included in the tuned television broadcast signal and performs horizontal output driving based on the separated vertical / horizontal synchronization signals to deflect the vertical / horizontal deflection coils provided in the CRT. By driving, the vertical / horizontal deflection of the CRT's scanning screen can be corrected.

In addition, such vertical / horizontal synchronization signals can be utilized as synchronization information in OSD display processing for adjusting a function assigned to the television or performing display processing of a function execution state. It is to make the state stable.

However, even if the synchronization signal is used as the synchronization information such as vertical / horizontal deflection drive processing and OSD display processing in such a television, when the channel search operation is performed for the non-broadcast channel, the normal synchronization information is according to the state of the non-broadcast channel. As it is impossible to receive the video signal, the normal vertical / horizontal deflection driving of the video screen becomes difficult and the screen display of the related OSD display information cannot be made stably.

Accordingly, the present invention has been made in view of the above circumstances, and in the state where the synchronization signal information extracted from a predetermined broadcasting channel is stored in advance as the synchronization pattern information on the television, the synchronization signal stored in advance during the channel search operation for the non-broadcast channel is stored. It is an object of the present invention to provide a synchronization signal information processing apparatus for channel search of a television that enables synchronous processing of a display function of a video screen by information.

According to the synchronization signal information processing apparatus for channel searching of a television according to the present invention for achieving the above object, the synchronization information by the synchronization signal separated from the television broadcast signal of a predetermined broadcast channel tuned by a tuner through a synchronization separation unit. In the television configured to perform luminance / color signal processing of the image signal processing unit, and to perform deflection driving by the deflection circuit unit, and to be utilized as synchronization information for OSD signal processing of the OSD signal processing unit. PLL circuit means for PLL-processing the synchronized synchronous signal, synchronous signal memory means for storing synchronous signal information PLL processed by the PLL circuit means, and switching for applying the synchronous signal from the synchronous separator to the PLL circuit means. In addition to performing the switching, the tuner stores the synchronization signal in the synchronization signal memory unit when searching for a broadcast-free channel. First and second switching switching means for performing switching switching for supplying the synchronized signal information to the video signal processing unit, the deflection circuit unit, and the OSD signal processing unit, and the first switching switching unit when tuning a broadcast channel by the tuner. Switching control so that the synchronous signal information is stored in the synchronous signal memory means, and the synchronous signal stored in the synchronous signal memory means when searching for a non-broadcast channel through the tuner according to a search command of the non-broadcast channel of a function setting unit. Provided is a synchronization signal information processing apparatus for channel searching of a television, comprising control means for switching and controlling the second switching switching means for supplying information to the video signal processing unit, the deflection circuit unit, and the OSD signal processing unit, respectively.

According to the present invention configured as described above, when a predetermined broadcast channel is selected and reproduced on a television, the synchronization signal information separated from the televiser broadcast signal of the broadcast channel is stored in advance in the memory means. When the channel search operation is performed on the broadcast channel, the synchronization signal information stored in the memory means is supplied to each circuit unit requiring synchronous signal processing by the synchronization signal, thereby realizing a normal video screen.

1 is a block diagram showing an apparatus for processing synchronization signal information during channel search of a television according to the present invention;

2 is a flowchart illustrating the operation according to the preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2: tuner, 4: video IF section,

6: image detector, 8: image amplifier,

10: video signal processor, 12: video output unit,

14: CRT, 16: Synchronous Separator,

18: deflection circuit portion, 20: FBT,

22,28: switching part, 24: PLL circuit part,

26: synchronous signal memory, 30: function setting section,

32: control unit, 34: OSD signal processing unit.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a synchronization signal information processing apparatus for channel searching of a television according to the present invention. In the apparatus of the present invention, reference numeral 2 denotes a predetermined broadcast channel from the control unit 32, which will be described later. Tuner which receives channel tuning data for tuning of broadcasting channel and tunes RF signal of corresponding channel to high frequency amplification, mixes with local oscillation frequency signal generated by the channel tuning data, and converts it into intermediate frequency signal and outputs it. Indicates.

Further, reference numeral 4 denotes an image IF unit for intermediate frequency amplifying the television broadcast signal of the selected broadcast channel, and 6 denotes an image detector for detecting and separating the video signal from the intermediate frequency amplified television broadcast signal. 8 shows an image amplifier which amplifies the detected image signal.

Reference numeral 10 denotes a synchronization signal which will be described later in accordance with a synchronization signal separated from a corresponding broadcast signal of the synchronization separator 16 to be described later by separating a luminance signal and a color signal from the signal amplified video signal. OSD signal processing unit to be described later by synthesizing the R / G / B signal after receiving the synchronization signal provided from the signal memory 26 and adjusting the luminance signal, restoring the color subcarrier signal, and performing color demodulation. An image signal processing unit for synthesizing the OSD display information processed from 34 with an R / G / B signal and outputting the same; and 12 denotes the CRT 14 by being amplified and driven by the image signal processed R / G / B signal. An image output unit for reproducing an image of a television broadcast on a screen is shown.

Reference numeral 16 denotes a synchronization separator for separating the synchronization signal from the image signal from the image amplifier 8, and 18 denotes a vertical / horizontal oscillation operation by receiving the synchronization signal separated from the synchronization separator 16. A deflection circuit portion for generating vertical / horizontal deflection pulses for vertical / horizontal deflection driving of the video screen by the deflection yoke of the CRT 14, and 20 denotes a horizontal deflection pulse from the deflection circuit portion 18. It represents a FBT (Fly Back Transformer) which is applied and generates a high voltage pulse signal required for the CRT 14.

Further, reference numeral 22 denotes a first switching switching unit which forms a switching path for pre-storing the synchronization signal separated from the synchronization separation unit 16 under the switching control of the control unit 32 described later, and 24 denotes the first switching unit. A PLL circuit section for PLL processing and outputting a synchronous signal from the synchronous separation section 16 that has passed through the switching switching section 22, and 26 represents a synchronous signal for storing the PLL processed synchronous signal through the PLL circuit section 24. Indicates signal memory.

Further, reference numeral 28 denotes each circuit unit (switching control unit 32) to be described later that requires synchronization information on the synchronization signal information read out from the synchronization signal memory 26 during the search function of the broadcast-free channel (video signal processing unit 10). And a second switching switching section for forming a switching path for feeding the deflection circuit section 18 and the OSD signal processing section 34 side.

Reference numeral 30 is provided in a predetermined portion of the remote control unit or the control panel of the main unit to perform key operation for channel switching of the broadcast channel, and to search for channels of the broadcast channel including the broadcast channel and the broadcast channel. A function setting section for performing key setting for the present invention is shown.

Further, reference numeral 32 denotes a switching control of the first switching switching unit 22 when channel tuning of a broadcasting channel through the tuner 2, so that the synchronization signal from the synchronization separating unit 16 is converted into the synchronization signal memory ( 26) and switching control of the second switching switching unit 28 during channel selection of the broadcast-free channel by the function setting unit 30 to store the synchronization signal information stored in the synchronization signal memory 26. A control unit for controlling the image signal processing unit 10, the deflection circuit unit 18, and the OSD signal processing unit 34 to be described later is shown.

Further, reference numeral 34 denotes that the synchronization signal from the synchronization separation unit 16 is applied when tuning the broadcast channel is reproduced, or the synchronization signal information from the synchronization signal memory 26 is supplied when the broadcast channel is searched. An OSD signal processing unit which performs OSD signal processing for displaying a function setting such as display of a channel number in accordance with a search for a broadcast channel and displaying a function execution state in synchronization with a processing operation.

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 2.

First, as a key operation for tuning a predetermined broadcast channel is performed by the function setting unit 30 in step 40, the control unit 32 tunes channel tuning data for tuning the broadcast channel. When an image signal is detected by the tuner 2 and tuned by the tuner 2, the intermediate frequency amplified by the image IF unit 4, and detected by the image detector 6, the image amplifier 8 detects the detected signal. The amplified video signal is amplified, while the sync separation unit 16 separates the sync signal from the video signal.

Accordingly, the image signal processing unit 10 performs luminance adjustment and color demodulation processing for the luminance / color signal based on the synchronization signal from the synchronization separation unit 16, and the deflection circuit unit 18 generates the synchronization signal by the synchronization signal. The vertical / horizontal deflection is performed by performing vertical / horizontal oscillation operation so that the vertical / horizontal deflection is caused by the deflection yoke of the CRT 14, while the OSD signal processor 34 displays an OSD for displaying the channel number synchronously with the synchronization signal. Signal processing is performed.

In that state, the process proceeds to step 41, and the control section 32 switches the first switching switching section 22 so that the synchronous signal from the synchronous separation section 16 passes through the PLL circuit section 24 to the synchronous signal memory ( 26).

In step 42, the controller 32 determines whether the function setting unit 30 performs the function setting for channel searching of the broadcast channel and the non-broadcast channel.

As a result of the determination in step 42, if it is determined that the function setting unit 30 is not performing key setting for channel searching, the control proceeds to step 43 so that channel tuning and reproduction of a normal broadcasting channel is performed. .

However, if it is determined in step 42 that the channel search function is performed by the key setting of the function setting unit 30, the control proceeds to step 44 where the overall broadcast channel and the no-broadcast channel to the tuner 2 are performed. As channel selection data to be searched for the channel is sequentially applied, the channel searching operation is performed.

In that state, the process proceeds to step 45, and the control unit 32 determines whether the broadcast channel tuned by the tuner 2 is the non-broadcast channel.

As a result of the determination in step 45, if it is determined that the broadcast channel tuned through the tuner 2 is a non-broadcast channel, control proceeds to step 46 so that the synchronization signal information stored in the synchronization signal memory 26 is read. In addition, switching control of the second switching switching unit 28 causes the synchronization signal information read out from the synchronization signal memory 26 to be deflected from the image signal processing unit 10 through the second switching switching unit 28. The circuit unit 18 and the OSD signal processing unit 34 are respectively applied.

Accordingly, the OSD signal processor 34 normally performs an OSD signal processing operation for displaying a channel number according to a predetermined non-broadcast channel in synchronization with the synchronization signal information.

Next, in step 47, the control section 32 determines whether the function setting section 30 is performing a key operation for ending the channel search function.

As a result of the determination in step 47, if it is determined that the function setting unit 47 is performing a key operation for terminating the channel search function, then the control proceeds to step 48 where the overall channel search for the broadcast channel and the non-broadcast channel is performed. After the function is terminated, the system enters a standby state for screen reproduction according to channel selection of other broadcasting channels.

According to the present invention made as described above, when searching for a broadcast-free channel in the television, it is possible to reproduce the normal video screen by the synchronization signal information stored in advance at the time of broadcast channel selection, so that Even when searching for channels, it is possible to implement a more stable screen.

Claims (1)

In addition to performing the luminance / color signal processing of the video signal processing unit 10 by the synchronization information by the synchronization signal separated through the synchronization separation unit 16 from the television broadcast signal of the predetermined broadcast channel tuned by the tuner 2, In a television configured to perform deflection driving by the deflection circuit section 18 and to be utilized as synchronization information for OSD signal processing of the OSD signal processing section 34, PLL circuit means 24 for PLL-processing the sync signal separated by the sync separator 16; Synchronization signal memory means 26 for storing synchronization signal information PLL-processed by said PLL circuit means 24, In addition to performing switching switching for applying the synchronization signal from the synchronization separation unit 16 to the PLL circuit means 24, the synchronization signal memory means 26 when searching the unbroadcast channel by the tuner 2 is performed. First and second switching switching means (22, 28) for switching switching for supplying the synchronization signal information stored in the < RTI ID = 0.0 > (1) < / RTI > to the video signal processing unit 10, the deflection circuit unit 18, and the OSD signal processing unit 34; Switching control of the first switching switching means 22 when tuning the broadcast channel by the tuner 2 allows the synchronization signal information to be stored in the synchronization signal memory means 26 and the function setting unit 30. The video signal processor 10 and the deflection circuit unit 18 store the synchronization signal information stored in the synchronization signal memory unit 26 when the broadcast channel is searched through the tuner 2 according to a search command of the broadcast-free channel. And control means (32) for switching and controlling the second switching switching means (28) for supplying to the OSD signal processor (34), respectively.