KR100317354B1 - Method of selecting mpeg program number - Google Patents

Abstract

PURPOSE: A method of selecting an MPEG program number is provided to decode a program association table, a communication guide table, a program map table and a service description table in advance to store the decoded tables as items of program numbers and allow a selected program to be tuned when an item of the program number is selected. CONSTITUTION: A packet of a program association table and a communication guide table is decoded to store program numbers, frequency bands corresponding to the program numbers and control codes for forward error correction in a memory(ST102,ST103). When a program number is designated(ST104), the frequency corresponding to the program number is read from the memory to control the frequency band of a tuner(ST105). A program association table is decoded from the bit stream of a broadcasting program obtained by controlling the frequency band of the tuner to detect a program map table packet(ST106). A video/audio packet corresponding to a program number selected from the program map table packet is decoded to be displayed on a screen(ST108).

Description

How to select MPEG program number.

The present invention relates to user program selection in MPEG (Motion Picture Expert Group) reception, and more particularly, MPEG program number selection for allowing a user to efficiently designate a program number using the increase / decrease key. It is about a method.

In general, video and audio receivers are analog, and their receivers store the frequencies of broadcasts where the tuner scans the entire frequency band and store the frequency of the broadcast in the receiver. By operating Gamkiei, he could specify the desired broadcast.

As shown in FIG. 1, the conventional analog television receiver has a tuner 100 for tuning a broadcast signal received through an antenna ANT to a corresponding channel, and a user inputted from the key input unit 102. FIG. The microcomputer 101 for tuning the tuner 100 to the corresponding frequency band according to the channel number of the video signal, and the image amplifier 103 for amplifying and outputting an image intermediate frequency from the composite video signal tuned through the tuner 100. And a synchronization controller 104 which separates and outputs a horizontal and vertical synchronization signal from the composite image signal input from the image amplifier 103, and synchronizes the image signal amplified by the image amplifier 103. Monitor 105 to be displayed on the screen by the synchronous signal of the signal and the audio amplifier 106 to amplify the audio intermediate frequency from the composite video signal output from the video amplifier 103 to the speaker 107 It is.

In this way, the conventional analog television main body configured as described above, when the user selects the corresponding broadcasting station through the key input unit 102 while the microcomputer 101 stores the frequency value of the broadcasting channel, the microcomputer 101 tuner 100. The control unit tunes to the corresponding broadcasting station channel selected by the user.

Accordingly, the corresponding broadcasting station signal selected by the user is input to the image amplifier 103 as a composite video signal through the antenna ANT and the tuner 100.

The image amplifier 103 amplifies the image intermediate frequency from the input composite video signal, and the synchronization controller 104 separates the horizontal / vertical synchronizer from the composite video signal and provides it to the monitor 105.

Accordingly, the image signal amplified by the image amplifier 103 is displayed on the monitor 105 by horizontal and vertical synchronization of the synchronization controller 104, and the audio signal output from the image amplifier 103 is amplified by the audio amplifier. It is amplified by the unit 106 and output to the speaker.

As shown in FIG. 2, a conventional analog radio receiver amplifies a voice intermediate frequency at a corresponding broadcast frequency tuned through an antenna ANT and a tuner 200 and outputs it to the speaker 204. A voice amplifier 203 and a microcomputer 201 for changing the amplification degree of the voice amplifier 203 and controlling the tuner 9200 according to the key signal inputted from the key input unit 202. Similarly to the first degree, the microcomputer 201 stores the frequency value being broadcast by scanning the entire frequency domain, and when the user increases or decreases the broadcasting channel through the key input unit 202, the microcomputer 201 stores the frequency value. The tuner 200 is controlled by the frequency ramp.

The voice of the broadcast signal tuned by the tuner 200 is amplified by the voice amplifier 203 and output to the speaker 204.

FIG. 3 is a block diagram of a broadcast receiving apparatus using a general MPEG. As shown in FIG. 3, the control unit selects a corresponding broadcasting station program number according to the key data input from the key input unit 308. A microcomputer 301 for controlling the entire system, a tuner 300 for tuning the corresponding broadcasting station received through the antenna ANT according to the control signal generated by the microcomputer 301, and an input through the tuner 300. A forward error correction decoder 302 for decoding an error by decoding a bit stream of a broadcast signal, and a bit stream decoded by the forward error correction decoder 302 into an audio bit stream and a video bit stream. A system decoder unit 303 for separately separating and outputting the data and informing the microcomputer 301 of a package data value of a corresponding program number; The audio decoder 304 decodes the audio bit stream decoded by the stem decoder 303 into an original audio signal by the control signal of the microcomputer 301 and outputs the audio bit stream to the speaker 306, and from the system decoder 303. And a video decoder 305 for restoring the input video stream to the original video signal by the control signal of the microcomputer 301 and displaying it on the monitor 307.

As described above, referring to FIG. 4, the conventional broadcast program selection method in the broadcast receiving apparatus using the configured general MPEG is as follows.

If the receiver selects a new program number (meaning the same as the channel number in the analog TV) through the key input unit 208 (step: ST1), the microcomputer 301 selects which frequency the program number selected through the key input unit has. When the system decoder 303 decodes the bit stream and informs the microcomputer 301 of the bit stream of the band and the package data value of the program number, the microcomputer 301 of the tuner 300 The frequency is tuned to the corresponding frequency band and the corresponding bit stream is input to the forward error correction decoder 302.

The forward error correction decoder 302 decodes a bit stream for the corresponding broadcast video signal, corrects an error, and inputs it to the system decoder 303.

The system decoder unit 303 generates a program association table (PAT) package from a bit stream in which an error is corrected in the forward error correction decoder unit 302 according to a corresponding program number input from the microcomputer 301. By decoding, the package data of the communication information table (NIT: Network Information Table) is detected (step ST2).

Then, the detected communication guide table (NIT) package is decoded again to find out whether the selected program is a line to be transmitted (step: ST3).

When the frequency at which the program designated by the program number is transmitted is recognized, the line is tuned (step: ST4).

When the bit stream for the broadcast signal is input again through the tuner 300 and the forward error correction decoder 302 by the step ST4, the program association table PAT is decoded from the bit stream. The package data of the program map table) is detected (step ST5).

The video / audio package data of the corresponding program is detected from the package of the detected program map table and input to the audio decoder unit 304 and the video decoder unit 305 (step: ST6).

The audio decoder unit 304 and the video decoder unit 305 restore the audio and video package data inputted by the control signal of the microcomputer 301 to the original signal (step: ST7) and the speaker 306 and the monitor. 307 is provided.

Then, if the new program number is input from the key input unit 308 (step: ST8), and if a new program is not specified, the microcomputer 301 continues with the tuner 300, the audio decoder unit 304, and the video decoder unit. 305 is set to the current program number, and if a new program number is designated, the process after step ST1 is repeated, thereby receiving a program designated by the user.

However, such conventional analog television receivers or radio receivers are not applicable to receivers packaged in MPEG system standards and are also packaged with time division multiple access (TDMA) tuning for broadcast frequencies. Since it is impossible to completely receive a broadcast, and only several broadcasts are multiplexed into packages, there is a problem in that a receiver must select a desired broadcast package among them.

Also, in case of MPEG receiver, the user must specify the program number so that the receiver can find the audio / video package data of the program and find out the transmission frequency so that the receiver can specify the program number. Since the value is in the range of 64K to 64K, the receiver has a very troublesome problem of selecting a broadcast by storing a 5-digit program number.

Accordingly, in view of the above-described problems, the present invention allows the receiver to decode the program association table, the communication guide table, the program map table, the service description table, etc. in advance, and the item of the program number, the corresponding transmission frequency band, and the audio / video packet. The present invention provides a method of selecting an MPEG program number to store a kit and to select a corresponding program when an item of a program number is selected.

As a method for achieving the object of the present invention, after initialization, the program association table and the communication guide table packet are decoded to store a program number, a frequency band corresponding to the program, and a control code for forward error correction in a memory. A second step of controlling a frequency band of the tuner by reading a frequency corresponding to the program number from a memory if a program number is designated after storing the program; and a bit of the corresponding broadcast signal obtained in the second step. And a fourth step of decoding the program association table from the stream to detect the program map table package, and a fourth step of decoding the video / audio package corresponding to the program selected from the program map table package. DETAILED DESCRIPTION OF THE INVENTION According to the description in detail as follows.

5 is a flowchart illustrating a program number selection signal of the present invention according to FIG. 3, as shown therein, initializing a system at power-on (ST100); Decoding the program association table (PAT) package after the initialization to detect communication information table (NIT) package data (ST101); Decoding the detected communication guide table (NIT) package to table a program number, a frequency band corresponding to the program number, and a control code for forward error correction (ST102); Storing the tabled program in a memory (ST103); Retrieving whether a new program number has been inputted through the key input unit 308 after storing the program (T104); If a new program number is designated as a result of the searching, reading a frequency corresponding to the program number from a memory and controlling a frequency band of the tuner 300 (ST105); Detecting program map table (PMT) package data by decoding a program association table (PAT) from the bit stream of the tuned broadcast signal (ST 106); Detecting video / audio package data corresponding to the selected program from the detected program map table (PMT) package data (ST107); Decoding the detected audio / video package data and transmitting the decoded audio / video package data to a speaker (306) and a monitor (307) (ST108); If a new program number is input during the decoding of the audio / video package data, and if the new program number is input, the process after the step ST104 is not repeated, and if the new program number is input, the process after the step ST107 is repeated (ST109). .

Thus, the MPEG program number selection method of the present invention made in detail with reference to Figure 3 as follows.

First, when the power is turned on, the microcomputer 301 initializes the entire system of the MPEG receiver (step ST100).

After the initialization is released, the microcomputer 301 receives the broadcast signal through the antenna ANT by controlling the tuner 300.

The bitstream of the broadcast signal received through the tuner 300 is input to the forward error correction decoder 302.

The forward error correction decoder 302 decodes the bitstream of the corresponding broadcast video signal, corrects an error, and inputs it to the system decoder 303.

The system decoder unit 303 is a program association table (PAT) communication guide table (NIT) package data from a bit stream in which an error is corrected in the forward error correction decoder unit 302 according to a control signal input from the microcomputer 301. Is detected and the package having the NIT packet data is decoded (step ST101) to detect all program numbers currently being broadcast and provide them to the microcomputer 308.

The detected program number is displayed on the monitor 307 through the video decoder unit 305 or via other display means (light emitting element, etc.) to allow the receiver to select the program number.

In this state, when the receiver selects and inputs the program number in sequence through the increase / decrease key of the key input unit 308, the microcomputer 308 sorts the input program numbers in order and the program number desired by the receiver. The video decoder unit 305 indicates whether the match is correct.

Thereafter, in order to receive the program corresponding to the program number selected by the receiver, information corresponding to the frequency band of the tuner 300 and a control code for forward error correction are tabled (step ST102).

The tabled program is stored in its own memory (step ST103).

That is, when specifically described, since the microcomputer 301 displays the program number and the receiver selects the program number, the 5-digit number in decimal may be difficult for the receiver to determine the program provider corresponding to the program number ( Name of a broadcasting station) may be displayed.

As an example, in the current analog television, KBS-1 may be displayed instead of channel-9 and MBC may be displayed on the screen of the monitor 307 instead of channel-11.

The name of such a program provider may be obtained by decoding a service description table (SDT).

In addition, in order for the microcomputer 301 to tune the program with the program number to the receiver, the microcomputer 301 must have an item of the program number. As described above, the microcomputer 301 sets the program association table when the receiver is initially set. PAT) and program information table (NIT) should be decoded and stored in its own memory.

The memory that stores this information uses inert memory to maintain information even after power off, or memory backed up by battery or capacitance, so that the information can be accessed at any time as needed, resulting in a delay in obtaining program items. Can be eliminated.

As such, when a new program number is input through the key input unit 308 in the state of storing the program item, the microcomputer 301 reads frequency information corresponding to the program number stored in the memory from the memory to adjust the frequency of the tuner 300. The band is controlled, that is, the channel to which the selected program number is transmitted is tuned (step ST105).

Accordingly, the bit stream of the broadcast signal corresponding to the program number is provided to the system decoder unit 303 through the tuner 300 and the forward error correction decoder unit 302.

The system decoder 303 decodes the program association table PAT from the input bit stream to detect program map table PMT package data (step ST106).

The video / audio package data corresponding to the selected program is detected from the detected program map table (PMT) package data and provided to the video decoder unit 305 and the audio decoder unit 304 (step: ST107). .

The video decoder unit 305 and the audio decoder unit 304 respectively restore the input video / audio package data to the original signal, display it on the monitor 307, and output the same to the speaker 306 (step). : ST108).

Thereafter, the microcomputer 301 searches whether the new program number is input from the key input unit 308 (step ST109), and if there is no new program number, continues through the video decoder unit 305 and the audio decoder unit 304. Control to output and display the video / audio signal of the currently received broadcast, and if a new program number is input, the process after the step (ST104) is repeated.

6 is a further program number selection signal flowchart of the present invention according to FIG.

Unlike the fifth figure, the program number is stored in the memory along with audio / video package data, program map table, etc., as well as information of program number, frequency information, and control code for correcting forward error. It is to select the program corresponding to this.

Since the steps ST200 to ST203 in FIG. 6 are the same as those described above in the steps ST100 to ST103 in FIG. 5, the description thereof will be omitted after step ST203. In the stored state, the microcomputer 301 reads frequency information corresponding to a program number stored in a memory and controls a frequency band of the tuner 300 to select a line to which a program number is transmitted (step ST204).

Accordingly, the bit stream of the broadcast signal corresponding to the program number is provided to the system decoder 303 through the tuner 300 and the forward error correction decoder 302.

The system decoder 303 decodes a program association table (PAT) package from the input bit stream (step ST205) to detect program map table (PAT) package data corresponding to the selected program number. (Step ST206).

Thereafter, video / audio package data corresponding to the selected program number is detected from the detected program map table (PMT) package data (step: ST207).

Then, the detected video / audio package data is mapped with the program number to be tabled and stored in the memory (step ST208).

In this way, the video / audio package data is stored in the memory and other program map tables (PMT) are searched for (step ST209). If not present, the process after the above step ST205 is repeated. If present, other frequency information (line) is searched for (step ST210).

If other frequency information does not exist as a result of the search in step ST210, a line is selected for another program number through the process after step ST203, and if a new program number is selected from the key input unit 308, if it exists. The search is made (step ST211).

If a new program number is selected from the key input unit 308 as a result of the search, the audio / video package data corresponding to the selected program number is detected (step: ST212).

In this way, if the audio / video package data is detected and decoded (step: ST213), the audio / video package data is again searched for whether a new program number is input through the key input unit 308. Restore the video package data to the original audio / video signal via the audio / video decoder unit 304/305 through the audio / video decoder unit 304/305 and provide it to the speaker 306 and the monitor 307 with the new program number. If is selected, the process after step ST211 is repeated to allow the receiver to receive the selected broadcast program.

In the method of selecting a program number in the present invention, a memory function is added to the remote control so that a user inputs necessary information to the remote control, and transmits the program number item to the microcomputer by mutual transmission and reception with the microcomputer 308 whenever the user uses the remote control. The user may determine the program number displayed on the screen and perform the tuning.

In addition, in order to enable the fast selection of the desired program among the program items stored in the microcomputer, the receiver attaches a tag number smaller than the program number to the frequently viewed program number and accesses the tag number with a small number of 5 decimal digits. The same operation as that in the case of accessing the program number can be performed.

As described in detail above, according to the present invention, a program association table, a communication guide table, a program map table, a service description table, and the like are used in an analog receiver using frequency division multiple access (FDMA) and time division multiple access (TDMA). It decodes in advance and stores the program number item, the corresponding transmission frequency band, audio / video package data, and the forward error correction control code even when the power is turned off. When selecting the program has the effect of providing the convenience that the program is automatically tuned and received.

1 is a block diagram of a conventional analog television receiver.

2 is a block diagram of a conventional analog radio receiver.

3 is a block diagram of a broadcast receiving apparatus using a general MPEG.

4 is a conventional program selection signal flow diagram according to FIG.

5 is a flowchart illustrating a program number selection signal of the present invention according to FIG.

6 is a flow diagram of a program number selection signal of the present invention according to FIG.

*** Description of the symbols for the main parts of the drawings ***

300: tuner 301: micom

302: forward error correction decoder unit 303: system decoder unit

304: audio decoder unit 305: video decoder unit

306: Speaker 307: Monitor

308: key input unit

Claims (2)

A first process of decoding a program association table and a communication guide table package after initialization to store a program number, a frequency band corresponding to the program number, and a control code for forward error correction in a memory; A second step of controlling the frequency band of the tuner by reading a frequency corresponding to the program number from the memory, and decoding a program association table from a bit stream of the corresponding broadcast signal obtained in the second step. And a fourth process of decoding a video / audio package corresponding to a program number selected from the program map table package and displaying the same on a screen. . The method of claim 1, further comprising: decoding a program association table package from a bit stream tuned to a program number after storing the program to detect program map table package data corresponding to the program number; Detecting audio / video package data for a corresponding program number from kit data, mapping the detected audio / video package data with a program number to a table, and storing another table and storing another program map And detecting and decoding and displaying the audio / video package data corresponding to the selected program number when the table, frequency band, and new number are selected.