KR100459159B1 - How to adjust screen of satellite receiver - Google Patents

Abstract

A method of adjusting a screen of a satellite broadcasting receiver equipped with a microcomputer and an NTSC / PAL encoder, the method comprising: extracting a current time from the broadcast service information of the microcomputer, and matching the extracted current time with a preset reference time; And a second step of determining whether the extracted current time coincides with a preset reference time, and a third step of controlling the NTSC / PAL encoder to an image state corresponding to the preset reference time. It is possible to provide an optimal screen state to the user by outputting a video signal automatically set to the current time without the user having to operate the brightness, color density, color per color, etc. with the remote controller.

Description

How to adjust screen of satellite receiver

The present invention relates to a screen adjustment method of a satellite broadcasting receiver, and in particular, for automatic surface adjustment to enable the screen adjustment automatically according to the current time without the user need to operate the contrast, brightness, color density, color, etc. of the screen with a remote control The present invention relates to a screen adjusting method of a satellite broadcasting receiver.

In general, digital satellite broadcasting requires multiplexing of TV signals. When multiplexing such TV signals (video / audio signals), each video / audio is divided into bit strings of a suitable length called a 'packet'. The video and audio packets are appropriately switched by attaching additional information such as a header and transmitted to the repeater (communication satellite) in a time division transmission method.

The packet transmitted through the repeater (communication satellite) is restored to the original signal through the subscriber's Digital Brodcasting System (DBS) receiver, so that the channeld transmitted from the broadcasting station can be viewed.

At this time, the broadcasting station converts and compresses the video, audio and transmission data signals into scrambled digital signals according to the Moving Picture Experts Group (International Standard for Media Integrated Video Compression, hereinafter referred to as 'MPEG'). It consists of a packet stream to make one TV signal stream.

Hereinafter, with reference to the accompanying drawings as follows.

1 is a block diagram showing a satellite broadcasting receiver according to the prior art.

An antenna 13, a low noise block (LNB) 4, a microcomputer 15, a tuner 16, an analog / digital (A / D) converter 17, a QPSK demodulator 18, Preprocessing error correction (FEC) unit 19, MPEG transport demux unit 20, video decoder 21, audio decoder 22, NTSC / PAL encoder 23, D / A The coverter 24, the memory 25, the modem 26, the smart card 27, and the remote control 28 are comprised.

A brief description of the operation of a general satellite broadcasting receiver configured as described above is as follows.

First, the satellite broadcasting signal of the 11 to 12 GHz frequency band received by the antenna 13 is converted into a local oscillation frequency of the LNB 14 to be converted into a 950 to 2150 MHz frequency band signal and input to the receiver.

Here, the microcomputer 15 of the receiver transmits a repeater selection value having a different value for each repeater to a phase locked loop (PLL) (not shown) inside the tuner 16 so that the user corresponds to a channel to be tuned to. To be converted to a constant frequency, the intermediate frequency (497.5 MHz).

The signal converted to the intermediate frequency is converted into a baseband signal by the tuner 16, and then converted into a digital signal through the A / D converter 17, and performs timing recovery and carrier recovery in the QPSK demodulator 18.

The tuner 16, the QPSK demodulator 18, and the FEC 19 remove and output data errors and noise generated during the transmission process.

After the error correction is performed in the FEC 19, the MPEG transport demux 20 selects and outputs only the corresponding signal by a control signal corresponding to a channel selected by the user among the corrected signals.

That is, since data of several input channels are multiplexed by TDM (Tome Division Multiplexing), only the data corresponding to one desired TV or data channel is selectively output by demultiplexing them.

At this time, the video and audio data are separated and output to the NTSC / PAL encoder 24 and the D / A converter 25, respectively.

When the signal selected by the MPEG transport demux unit 20 is encrypted (scrambled), the descrambler 21 descrambles (decrypts) and outputs the descrambler 21 to the MPEG transport demux 20 again.

In addition, the video signal among the signals output from the MPEG transport demux 20 is input to the video decoder 22 and decoded, and is encoded by the NTSC / PAL encoder 24 and output as a video signal.

The audio signal of the signal output from the transport demux 20 is input to the audio decoder 23 and decoded, and is converted into an analog signal by the D / A converter 25 and output as an audio signal.

The video decoder 22 restores the compressed video data, and finally outputs a video signal such as NTSC through the NTSC / PAL encoder 24.

At this time, the microcomputer 15 performs appropriate control so that each part operates normally, and among them, controls the NTSC / PAL encoder 24 which outputs a control signal for the final video signal.

In addition, the smart card 27 stores a unique number (ID) that is designated when receiving the Euro broadcast, outputs to the microcomputer 15 and outputs the number of pay-TV viewings, and program guide information from the microcomputer 15. Is received and stored in the memory 25, the modem 26 transmits the pay-TV viewing frequency from the smart card 27 to the broadcasting station.

On the other hand, a display device such as a TV can adjust the video state in detail even when a constant video signal is input.

In the case of the TV, you can individually select the brightness, brightness, color density, color, etc. as the detail items of the image by using the buttons on the remote control or the front panel, and the user selects the standard / day / night by automatic video. It can also be set at the same time.

Satellite broadcasting receiver according to the prior art has a inconvenience to adjust the contrast, brightness, color density by performing the remote control operation when the user wants to adjust the image.

The present invention has been made to solve the above problems, and the user can operate the video signal automatically set to the current time without the user having to directly operate the sub-items (contrast, brightness, color density, color, etc.) with the remote control. The purpose of the output is to provide the user with the best screen state with maximum convenience.

The present invention relates to a method for adjusting a screen of a satellite broadcasting receiver, comprising: a first step of setting a reference time, a second step of detecting a current time, and a step of determining whether the set reference time matches the detected current time And a fourth step of automatically converting the current video state to a preset video state according to the determined result.

It is important to adjust the video status according to the current time zone, as can be seen from the standard, day, and night among the automatic video items of the TV remote control. This is because the solar illuminance around the TV changes depending on the time of day.

On the other hand, in order to implement this, since it is necessary to know the current time, satellite broadcasting service information (SI) for selecting a channel and program guidance, etc. is included in addition to video / audio data among satellite signals input to the satellite broadcasting receiver. Among these, there is PSI (Program Service Information) data called TDT (Time Data Table).

By analyzing the TDT, the current time can be known, and the microcomputer outputs a control signal to suit the current time, thereby controlling the NTSC / PAL encoder to output the video signal in an optimal state.

Hereinafter, with reference to the accompanying drawings as follows.

2 is a flowchart illustrating a screen adjusting method of a satellite broadcasting receiver according to the present invention.

Referring to FIG. 2, the reference time is set (S1), and the current time is detected from the TDT data in the satellite broadcast signal (S2).

It is determined whether the set reference time matches the detected current time (S3), and when the current time matches the reference time, it is automatically changed to a preset image state (S4).

The optimally converted image state is automatically output to the screen (S5).

The current time may be detected by interpreting a time data table (TDT), and in order to obtain the time date table (TDT), a PID (Paket Identifier) of a program guide message (PMM) must be known.

The PMM is subdivided into a network information table (NIT), a service description table (SDT), and a time data table (TDT). TDT is required to detect the current time in the table.

In order to obtain the TDT, the microcomputer needs to recognize the PID of the PMM table, which can be found by analyzing a PAT (fix the PID of the PAT to 0x00).

First, when the PID of the PMM is found, a control is performed to find a PMM in the MPEG transport demux, and the MPEG transport demux finds a PMM table using the PID of the input PMM, Notify by interrupt or the like.

The microcomputer parses the PMM table, finds a TDT table (fixed PSI table ID value is 0x70 in the case of a green light satellite), and obtains 40-bit universal time coordinate (UTC).

By converting the UTC time into a known method, the current date and time can be obtained.

For example, if the contents of the TDT table are 0xc6, 0x32, 0x02, 0x53, and 0x14, it means 11:53:14 AM (Korea time) on October 17, 1997.

It is used to automatically adjust the image state of the screen by using the detected current time.

Therefore, if you set the automation screen status to 2 levels of day / night and the reference time is set to 6 pm, the microcomputer sets the encoder to the morning video status (contrast, brightness, color density, color) before 6 pm. After 6 pm, which is a reference time, the control is automatically changed to the afternoon image state and control is performed.

According to the present invention, the screen adjusting method of the satellite broadcasting receiver has the following effects.

First, the internal microcomputer judges the current time by itself and controls the NTSC / PAL encoder so that the current state (contrast, brightness, color density, color) suitable for the current time is achieved without the user's remote control. Keep it automatic.

Second, having a D / A converter with a similar function to an NTSC / PAL encoder for display on a display device such as a TV or monitor can be applied to any system that knows the current time.

1 is a block diagram showing a general satellite broadcasting receiver

2 is a flowchart illustrating a screen adjusting method of a satellite broadcasting receiver according to the present invention.

Claims (2)

In the method of adjusting the screen of a satellite broadcasting receiver equipped with a microcomputer and NTSC / PAL encoder, Extracting a current time from the broadcast service information of the microcomputer; A second step of determining whether the extracted current time coincides with a preset reference time; And a third step of controlling the NTSC / PAL encoder to an image state corresponding to a pre-stored reference time when the extracted current time coincides with a preset reference time. . The method of claim 1, The first step is a step of extracting the current time from the TDT data of the satellite broadcast signal receiving method of the satellite broadcast receiver.

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