KR100269811B1 - Method for reducting memory of bit map in a satellite broadcasting receiver - Google Patents

Abstract

PURPOSE: A method for reducing a bit map memory of a satellite broadcasting receiver is provided to share a memory for highlight and de-highlight indicating the movement of a cursor on a bit map, so as to prevent a memory waste according to the increase of the bit map. CONSTITUTION: If a key signal for bit map display is inputted through a key input unit(100), a controller(140) stores a de-highlight color index value of a key having largest size in an OSD(On Screen Display) buffer(160). A controller(140) converts a color index value corresponding to a present cursor position into a highlight color index value, and reads the highlight color index value stored in the OSD buffer(160) by being converted. The controller(140) highlights the present cursor position. The controller(140) decides whether a key signal for moving the cursor is inputted from the key input unit(100). If inputted, the steps from the step of converting a color index value of a present cursor position into the highlight color index value are repeated. If a key signal for moving the cursor is not inputted, the controller(140) converts a color index value, corresponding to a cursor position before movement, stored in the OSD buffer(160) into a de-highlight color index value. And the controller(140) reads the de-highlight color index value stored in the OSD buffer(160) by being converted, to de-highlight the cursor position before the movement.

Description

How to Reduce Bitmap Memory in a Satellite Broadcast Receiver

The present invention relates to a satellite broadcast receiver, and more particularly, to a method for reducing a bitmap memory of a satellite broadcast receiver for reducing a memory of a bitmap according to various menu screens of a satellite broadcast receiver.

Satellite broadcasting transmits broadcast programs sent from ground stations (broadcasting earth stations) using satellites (communication satellites) located at an altitude of approximately tens or hundreds of kilometers from the earth's surface, that is, a satellite (communication satellite) located at an orbit of 35.786 km (about 36.000 km) over the equator. It is a broadcast that provides a broadcast signal to a wider area so that it can be directly received by a satellite broadcast receiving antenna in each home. The satellite broadcasting reception antenna includes a low noise blockdown converter (LNB) for converting an RF signal of an ultrahigh frequency into an intermediate frequency (IF) signal, and receives an RF signal of a high frequency from a satellite broadcasting receiver (receiver). Convert to IF signals in the hundreds to thousands of MHz bands possible (e.g., 950 MHz to 2050 MHz). Therefore, in the satellite broadcasting tuner provided in the satellite broadcasting receiver (receiver), the broadcasting signal of the channel selected by the user is tuned from the IF signal received and input through the low noise converter.

At this time, the satellite broadcast receiver restores the broadcast signal of the channel selected by the user to the transport stream through the process of conversion to IF, demodulation and error correction. The transport stream as described above is transmitted in a packet unit of 188 bytes, and the packet at this time can be largely divided into a program guide packet and a program service data packet. Here, the program guide packet includes a channel information packet having program association table (PAT) information having a packet ID (Packet IDentification (PID)) of N bits representing a program number of each channel. A program information packet having program map table (PMT) information of N-bit packet ID (PID) information meaning audio, video, text, etc. of a channel; Audio data packet, a video data packet, a text data packet, and the like, wherein the program guide packets are continuously inserted at intervals of several seconds between program service data packets and transmitted.

Therefore, in the satellite broadcasting receiver, when the power is turned on by the user, the program guide packet inserted between the program service data packets and transmitted at intervals of several seconds as described above is extracted by the packet ID, and the information included in the extracted program guide packet is used. That is, channel ID, program name. Program start time and end time, program grade, voice mode, paid broadcasting, etc. are stored in memory, and audio data and video data of each channel are MPEG decoded and audio data is output through the speaker. Video data is output to the display side of a monitor or the like.

The program information stored in the memory is used to tune a specific channel selected by the user, and when the user is required to provide (i.e. display) a plurality of channel information and broadcast program information of each channel by the user, It is composed of menu screen and displayed on the monitor.

As such, the satellite broadcasting receiver may display screens of various menus using graphic tools for program information stored in the memory. In such a menu, when a bitmap having an array of color index values according to the menu screen configuration is used, 16 color indexes exist, and a white color index is 0. , The color index of the test is 16.

For example, if the help menu is a bitmap on the remote controller description menu screen, a portion of the help menu is highlighted (or de-) to indicate the movement of the cursor on the bitmap corresponding to the desired operation. Another bitmap is highlighted. That is, since the movement of the cursor on the bitmap is represented by highlights and dehighlights, the memory for the highlights and the memory for the dehighlights must exist respectively, which causes a problem of memory waste due to the increase of the bitmap. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to share a memory for highlights and dehighlights for indicating the movement of a cursor on a bitmap in one memory, thereby increasing the bitmap. The present invention provides a bitmap memory reduction method of a satellite broadcasting receiver to prevent memory waste.

According to an aspect of the present invention, there is provided a method for reducing a bitmap memory of a satellite broadcasting receiver in which a color index of a bitmap is changed to reduce a memory according to an increase in a bitmap, and the key having the largest size in the bitmap. A color index value storing step of storing a color index value of the color index value; A highlight step of highlighting the moved cursor position part by changing the color index value of the moved cursor position part among the color index values stored in the color index value storing step into a highlight color index value when the cursor position is moved by the user; And dehighlighting the cursor position portion before moving by changing the color index value of the cursor position portion before moving among the color index values stored in the color index value storing step to the de highlight color index value.

1 is a block diagram showing the configuration of a satellite broadcast receiver for performing a bitmap memory reduction method of a satellite broadcast receiver according to an embodiment of the present invention;

2 is a flowchart illustrating a process for performing a bitmap memory reduction method of a satellite broadcasting receiver according to the present invention;

3 is a diagram illustrating a bitmap according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

100: key input unit 110: tuner and demodulation unit

120: transport demultiplexer 130: MPEG decoder

140: control unit 150: memory

160: OSD buffer 170: menu generator

180: image synthesis unit

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

1 is a block diagram illustrating a configuration of a satellite broadcast receiver for performing a method for reducing a bitmap memory of a satellite broadcast receiver according to an exemplary embodiment of the present invention. The key input unit 100, the tuner and demodulator 110, and a transformer are shown. The port demultiplexer 120, the MPEG decoder 130, the controller 140, and the memory 150. An OSD (On Screen Display) buffer 160, a menu generator 170, and an image synthesizer 180 are configured.

The tuner and demodulator 110 tunes the corresponding channel according to the tuning control signal of the controller 140, as will be described later. That is, the tuner and demodulator 110 tunes a channel corresponding to the tuning control signal of the controller 140 among the satellite broadcast signals received through the satellite broadcast receiving antenna, and converts, demodulates, and errors the broadcast signal of the tuned channel into IF. Restore to the transport stream through the correction process. At this time, the restored transport stream includes audio and video signals, text data, and program guide information of each channel, and the tuner and demodulator 110 controls the restored transport stream under the control of the controller 140. Provided to the transport demultiplexer 120. In this case, the transport demultiplexer 120 provides an audio signal and a video signal of the transport stream provided by the tuner and the demodulator 110 to the MPEG decoder 130, and provides program guide information to the controller 140. do.

In addition, the MPEG decoder 130 may vary the length of the compression-coded video signal by considering the spatial and spatial correlation of the compression-coded audio signal and the video signal provided by the transport demultiplexer 120, for example, the video signal. A decoding technique such as decoding, inverse DCT, inverse quantization, and motion compensation is used to restore the original signal before encoding. That is, the MPEG decoder 130 converts the decoded digital audio signal into an analog audio signal through an audio signal processor (not shown) and outputs it to a speaker not shown, and the digital video signal decoded by the above process is NTSC or PAL. After converting to an analog video signal it is provided to the image synthesizer 180.

On the other hand, the key input unit 100 is generally configured to provide a predetermined key signal pressed by the user to the control unit 140 is composed of key metrics, the control unit 140 from the key input unit 100 When the tuning signal is provided, the tuning control signal is provided to the tuner and the demodulator 110 to tune the broadcast signal of the corresponding channel as described above, and the program information provided by the transport demultiplexer 120 is stored in the memory 150. ) And the memory 150 stores program information provided from the controller 140. At this time, when a signal for the program information guide screen display key is provided from the key input unit 100, the controller 140 reads out the program information stored in the memory 150 and provides the menu information to the menu generator 170 to display on the screen. Let's do it.

In addition, in the bitmap according to the remote controller menu screen as shown in FIG. 3, the controller 140 moves the key to explain each key of the remote controller, that is, the movement of the cursor on the bitmap. When the corresponding key signal is provided from the key input unit 100, the corresponding part on the bitmap is highlighted or dehighlighted. That is, the controller 140 stores the color index value of the key having the largest size in the bitmap in the OSD buffer 160 and then provides the key signal according to the movement of the cursor from the key input unit 100 as described above. If the color index value stored in the OSD buffer 160 is changed to the highlight color index value corresponding to the current cursor position and stored, the highlight color index value is provided to the menu generator 170. Next, the control unit 140 converts the portion corresponding to the cursor position before moving among the color index values stored in the OSD buffer 160 into a de highlight color index value and stores the de highlight color index value to the menu generator 170. to provide.

The menu generating unit 170 has various preset menu screen format information for configuring a variety of information provided by the satellite broadcasting receiver as a menu screen. Thus, the menu generating unit 170 receives program guide information provided from the controller 140 as described above. A menu screen corresponding to preset menu screen format information is configured and provided to the image synthesizing unit 180. In addition, the menu generator 170 OSD-processes the current cursor position with the highlight color index value provided by the controller 140 and corresponds to the cursor position before moving to the dehighlight color index value provided by the controller 140. OSD processing, and the portion corresponding to the cursor position before the movement is composed of the de-highlighted screen and after the cursor is moved, that is, the portion corresponding to the current cursor position is composed of the highlighted screen to the image synthesizer 180 to provide.

Accordingly, the image synthesizer 180 converts the decoded video signal provided from the MPEG decoder 130 and the menu screen provided from the menu generator 170 into NTSC or PAL analog signals under the control of the controller 140. It is then mixed and displayed on the display side of a monitor or the like.

FIG. 2 is a flowchart illustrating a process for performing a bitmap memory reduction method of a satellite broadcast receiver according to the present invention, and will be described in detail with reference to the block diagram of the satellite broadcast receiver shown in FIG. 1. .

When a key signal is provided from the user through the key input unit 100 to display a bitmap, that is, a bitmap of the remote controller description menu screen as shown in FIG. 3 (step 200), the controller 140 displays a keymap. In step 201, the color index value for the key having the largest size in the bitmap of the remote controller description menu screen shown in FIG. 3 is shown, for example, 'calendar', which is a hatched portion shown in FIG. If is assumed to be the largest key in the bitmap of the remote controller description menu screen, the de-highlight color index value for the 'calendar key' is stored in the OSD buffer 160.

Next, the controller 140 proceeds to step 202 to correspond to the current cursor position, that is, the moved cursor position (for example, 'calendar') of the dehigh color color index values stored in the OSD buffer 160. After changing the color index value of the portion to the highlight color index value and proceeding to step 203, the process proceeds to step 203 to read the stored color index value by changing the OSD buffer 160.

Next, the controller 140 proceeds to step 204 to highlight a portion corresponding to the current cursor position. That is, the controller 140 provides the highlight color index value read in step 203 to the menu generator 170, and the menu generator 170 processes the OSD corresponding to the current cursor position as the highlight color index value. As a result, the part corresponding to the current cursor position is highlighted, and the process proceeds to step 205 where a key signal for moving the cursor (movement) from the key input unit 100 (for example, 'viewer key' in 'calendar key'). To determine whether a key signal for moving to is provided.

As a result of determination, when a key signal for moving the cursor is provided from the key input unit 100, the process returns to step 202 to highlight the current cursor position (for example, a portion corresponding to the 'viewer key'). If the key signal for the cursor movement is not repeated and the key signal for the cursor movement is not provided, the process proceeds to step 206 and among the color index values stored in the OSD buffer 160, the color index value corresponding to the cursor position portion before the movement, that is, the highlight color index value After changing to the highlight color index value and storing it, the flow proceeds to step 207.

The controller 140 proceeds to step 207 to read the dehighlight color index value stored in the OSD buffer 160 to dehighlight the portion corresponding to the cursor position before moving (step 208). That is, when the control unit 140 provides the dehighlight color index value read in step 207 to the menu generating unit 170, the menu generating unit 170 moves the dehighlight color index value provided by the control unit 140 before moving the cursor. By OSD processing on the part corresponding to the position, the part corresponding to the cursor position before moving is highlighted.

As described above, the present invention stores a highlight color index value at a portion corresponding to a current cursor position, that is, a moving cursor position by using one memory, and then highlights the current cursor position portion using this value by OSD processing. The part corresponding to the previous cursor position is stored as the dehighlight color index value, and the deserialization is performed by OSD processing the cursor position part before moving to this value, thereby preventing the waste of memory due to the increase of the bitmap.

Claims (3)

In the bitmap memory reduction method of a satellite broadcasting receiver for reducing the memory according to the bitmap increase by changing the color index value of the bitmap, A color index value storing step of storing a color index value of a key having the largest size in the bitmap; A highlight step of highlighting the moved cursor position part by changing the color index value of the moved cursor position part among the color index values stored in the color index value storing step to a highlight color index value when the cursor position is moved by the user; And a dehighlighting step of dehighlighting the cursor position portion before moving by changing the color index value of the cursor position portion before moving among the color index values stored in the color index value storing step to a de-highlight color index value. Bitmap memory reduction method of broadcast receiver. The method of claim 1, wherein the highlighting step comprises: converting and storing a color index value of a moved cursor position part of the stored color index values into a highlight color index value when the cursor position in the bitmap is moved by a user; step; Reading the highlight color index value; And a third step (OSD) processing the cursor position portion shifted to the highlight color index value read out in the second step. The method of claim 1, wherein the dehighlighting step comprises: a first step of converting and storing a color index value of a cursor position portion before moving among the stored color index values into a dehighlight color index value; A second step of reading the de highlight color index value; And a third step (OSD) processing the cursor position portion before moving with the dehighlight color index value read in the second step.