JP2001308729A - Tdm demodulation controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a TDM demodulation controller which can obtain all latest program property information while reproducing a desired audio signal. SOLUTION: In a first and a second TDM demodulation parts which demodulate program property information of one program included in one BC data and a digital audio signal from a TDM bit stream composed of a plurality of the BC data including one or more programs and multiplexed, and in a TDM demodulation controller which decodes a digital audio signal, a control part performs demodulation indication sequentially and extracts the program property information on all the programs to record in a data recording means to the second TDM demodulation part. By user's program selection, the digital audio signal of the program on the basis of the program property information recorded in the data recording means is demodulated in the first TDM demodulation part to decode in an audio decoding part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a demodulation control device for a TDM bit stream transmitted via a satellite or the like.

[0002]

2. Description of the Related Art In recent years, satellite broadcasting systems such as BS and CS have been used to provide programs such as video and audio, as well as broadcast channel data (hereinafter referred to as BC data) numbers, program numbers, and program names. The program multiplexes the program attribute data indicating the program and the like, and the receiver creates an electronic program guide based on the program attribute information, so that the user can refer to the electronic program guide on the display screen and It is used as a system that allows easy and efficient selection and viewing of programs such as video signals and audio signals.

[0003] Before describing a conventional example of a TDM demodulation control device for a receiver and the present invention, the configuration of a transmitter will be described first. 7 shows a configuration diagram of the transmitter, and FIG. 4 shows configuration data at each configuration stage in FIG. In FIG. 7, 90
1a and 901b are broadcast station data generated in the respective broadcast stations BC1 and BC2. Broadcast station data prepares one or more programs. One program in FIG. 7 is the content of an audio signal that has been highly efficiently compressed by MPEG. In one program, a plurality of programs are arranged according to a certain arrangement rule in units of a fixed bit length, and one broadcast station data 901a, 901b is constituted.

[0004] SC configuration information 902a and 902b include program attribute information such as a program number and a program name of each program existing in one broadcasting station and program arrangement information of each program. 903a and 903b are SC synchronization signals for synchronizing programs. Reference numerals 904a and 904b denote transmission path coding for adding a transmission path error correction code to each broadcast data. 905a and 905b are:
This is a BC synchronization signal for synchronizing BC data. 9
Reference numeral 06 denotes multiplexing for rearranging and multiplexing a plurality of BC data according to a certain arrangement rule. Reference numeral 907 denotes BC configuration information including the broadcast station number of each broadcast station and the BC arrangement information of the BC data. Reference numeral 908 denotes transmission line coding for adding an error correction code of the BC configuration information 907. 909 is a frame synchronization signal.

A, B, C, and D are configuration data at each configuration stage, and correspond to the configuration data of A, B, C, and D in FIG. Next, a processing procedure of the transmitter will be described with reference to FIG. In FIG. 7, two broadcasting stations BC1 and BC1
2 shows an example of a configuration in which 2 exists. Processing procedure is broadcasting station B
C1 will be described. The broadcast station BC1 has a plurality of programs from program 1 to program n according to the number of programs.

[0006] The configuration data D is an MPEG of one program.
It is the content of the audio signal, and is a program 1 (SC
1) is from SC1 (1) to S using a fixed bit length as a unit.
C1 (n). Each program is rearranged and multiplexed with a fixed bit length as a unit according to a certain arrangement rule, and outputs one broadcast station data. SC configuration information 9
02a includes program arrangement information rearranged and multiplexed according to a certain arrangement rule and program attribute information such as a program number and a program name of each program. One broadcast station data is SC configuration information 9
02a is added to the SC synchronization signal 903a and output to the transmission path coding 904a. This output data is referred to as time frame α
(Hereinafter referred to as a BC frame).

[0007] The configuration data C is one broadcast station data including a plurality of programs, and includes, for each BC frame, an SC synchronization signal, SC configuration information, and a plurality of program data arranged according to a certain arrangement rule from the beginning. It is composed in order. The transmission line encoding 904a uses one broadcast data as a unit.
Generate error correction code data of the transmission path in the order of Reed-Solomon coding and Viterbi coding, add a BC synchronization signal,
Output to multiplexing 906.

[0008] The configuration data B is one piece of broadcast data to be output to the multiplexing 906, and includes a BC synchronization signal and a broadcast station B.
It consists of C1 broadcast data. Broadcasting station BC2 outputs to multiplexing 906 through the same processing procedure as broadcasting station BC1. The multiplexing 906 rearranges these two pieces of broadcast data with a bit length different from the fixed bit length in the above-mentioned program and rearranges them according to a certain arrangement rule, and multiplexes and outputs them. The multiplexed data includes, in the BC configuration information 907, BC array information rearranged and multiplexed according to a certain arrangement rule and program attribute information of the broadcast station number of each broadcast station.
After performing the code generation processing of the error correction code according to No. 8, a frame synchronization signal 903a is added and output as one TDM bit stream data (hereinafter, referred to as TDM data) to a subsequent wireless modulation unit. The TDM data is output in units of a time frame β (hereinafter, referred to as a TDM frame).

The configuration data A includes a time frame β (hereinafter referred to as a time frame β).
Each frame is composed of a frame synchronization signal, BC configuration information, and a plurality of BC data arranged according to a certain arrangement rule. Thereafter, in the subsequent stage, the TDM data is QPSK modulated, converted to a radio transmission frequency, subjected to high frequency amplification, and transmitted by an antenna. The receiver performs a process reverse to the above-described procedure of the transmitter.

Next, the TDM demodulation control device of the receiver will be described. FIG. 2 shows a configuration diagram of a conventional TDM demodulation control device. 2, reference numeral 202 denotes an antenna for receiving a radio wave from a satellite; 204, a tuner for tuning to a desired received radio wave; a, TDM data of a QPSK signal demodulated by the tuner 204; and 206, BC data of TDM data a. TDM demodulator for demodulating and extracting programs and program attribute information, 210 is a controller, 208 is T
An audio decoder 214 for decoding digital audio data of a program demodulated by the DM demodulator 206, and a key controller 214. Further, a display screen 212 displays a broadcast name, a program name, and a song name included in the selected program.
Is a D / A converter for converting digital audio data from the audio decoding unit 208 into an analog audio signal.

FIG. 5 shows an example of the key operation unit 212 and the display unit 214. 212a and 212b are UP and DOWN keys for selecting a program, 212c is a program confirmation key for deciding a desired program, 214S is the BC number, broadcast station name, program number and program of the program currently being reproduced. It is a display screen of a display device for displaying attribute information.

FIG. 3 shows the TDM demodulator 206 shown in FIG.
FIG. 3, a is the TDM data of the QPSK signal as in FIG. 2, 100 is an A / D converter that digitizes the TDM data, 101 is a QPSK demodulator that demodulates the digitized QPSK signal, 102
Is a frame synchronization unit that synchronizes TDM frames of QPSK-demodulated digital data, 103 is a BC selection and extraction unit that selects and extracts one BC data, and 104 is a BC data that is Viterbi-encoded in BC frame units. A Viterbi decoder that performs a decoding process, 105 is a Reed-Solomon decoder that performs a decoding process of the BC data encoded by the Reed-Solomon code, and 106 is one decoded B
A program selection / extraction unit 107 extracts one program from the C data, selects the program, and outputs the selected program to the audio decoding unit. Reference numeral 107 denotes a control unit I / F that detects a request command from the controller 210. The operation of the TDM demodulation control device configured as described above will be described below.

In FIG. 2, a radio wave from a satellite is tuned to a desired frequency by an antenna 202 and a tuner 204, and a QPSK-modulated radio wave is received. QP received
For the SK modulated signal, the TDM data a
Input to DM demodulator 206. Next, the TDM demodulator 20
The operation of No. 6 will be described. In FIG. 3, an A / D converter 100 converts an analog signal of the TDM data a into digital data, and inputs the TDM data to a frame synchronization unit 102. T input to frame synchronization section 102
The DM data corresponds to the configuration data A in FIG.

The frame synchronization unit 102 detects the frame synchronization signal of the configuration data A in FIG.
The synchronization processing of M frames is performed. After the synchronization is completed, the BC configuration information of the configuration data A is correctly corrected based on the error correction code following the configuration information data. By this correction process, the controller 10 acquires all the BC numbers included in the BC configuration information.

Next, the controller 210 controls the TDM in FIG.
The control unit I / F 107 of the demodulator 206 outputs a BC number selection command acquired first. Control unit I / F1
07 detects the selection command and instructs the BC selection and extraction unit 103. The BC selection and extraction unit 103 extracts one BC data that has been firstly extracted from a plurality of BC data, based on the BC arrangement information included in the BC configuration information. B
The C data corresponds to the configuration data B in FIG. B
The C data corrects an error in the wireless transmission path correctly by the Viterbi decoder 104 and the Reed-Solomon decoder 105.

Next, the controller 210 controls the TDM in FIG.
The SC configuration information is acquired from the program selection and extraction unit 106 via the control unit I / F 107 of the demodulator 206. The SC configuration information includes program attribute information such as a program number and a program name of each program, and program arrangement information of each program. The data after the error correction is the configuration data C in FIG.
And the SC configuration information follows the SC synchronization signal.

Next, the controller 210 controls the TDM in FIG.
An instruction to select a program number acquired first is output to the control unit I / F 107 of the demodulator 206. Control unit I / F1
07 detects a selection command and instructs the program selection / extraction unit 106. The program selection and extraction unit 106 extracts one program which has been firstly extracted from a plurality of programs, based on the program arrangement information included in the SC configuration information. The data that has been extracted and output is a highly efficient compressed MPEG
The audio signal is input to the audio decoder 208.

The MPEG audio signal is decompressed and decoded by the audio decoder 208, and then the D / A converter 216
To convert to analog audio signal and play back. At this time, based on the acquired program attribute information, the controller 210 determines the BC number, broadcast name, program name,
The program number is displayed on the display 214. Next, an example of the display screen is shown in FIG. The upper display screen 214S in FIG.
Shows the program attribute information of the program currently being reproduced. When selecting another program included in the same BC data, the user performs a key operation with the key operation device 212.

In FIG. 5, UP keys 212a and D
After selecting a program with the OWN key 212b, the program is determined with the program determination key 212c. The controller 210 that has received the selection command from the key operation unit 212 issues a program selection command to the control unit I / F 107 of the TDM demodulator 206 shown in FIG. The control unit I / F 107 detects the selection command and instructs the program selection and extraction unit 106 to select a program included in one broadcasting station. The output data of the MPEG audio of the selected program is decompressed and decoded by the audio decoder 208 and then converted to an analog audio signal by the D / A converter 216 and reproduced.

[0020]

One of the functions desired for a receiver is to enhance an electronic program guide. This means that an electronic program guide is displayed on a display unit based on program attribute information such as a broadcast number, a broadcast station name, a program number, and a program name to determine what program exists in the TDM data. Is to select a desired program efficiently. Also, in order to improve the reliability of the electronic program guide, it is necessary for the broadcasting station to provide an electronic program guide based on the latest program attribute information even if the program content and its broadcast time are changed irregularly every day. There is also.

However, on the transmitter side, an error correction code is added to one BC data including a plurality of programs, and the actual TDM demodulation control device also has one BC data.
Since error correction processing is performed on the data, after selecting the BC number and one program included in the BC number, the program attribute information of one program can be extracted only after error correction processing is performed by the TDM demodulation unit.

Therefore, in order to acquire the program attribute information of all the BC data, it is necessary to extract the program attribute information while sequentially selecting and demodulating each program included in the BC data for each BC number. However, the processing time required for this is required. In other words, when the power of the receiver is turned on,
If the acquisition of the newest program attribute information is the first priority, the time required until the audio signal of the desired program is output becomes longer, which degrades the quality of the receiver. Also, when trying to obtain the latest program attribute information while a desired audio signal is being reproduced, the currently reproduced audio signal is selected in order to perform a BC number and program selection operation and error correction processing. The adverse effect that the signal is momentarily interrupted also occurs.

The present invention does not delay the time required from turning on the power of the receiver to outputting the audio signal, furthermore, does not interrupt the audio signal currently being reproduced, and does not interrupt the program attribute information of all the programs. , And the latest electronic program guide created based on the program attribute information allows the user to select a program, and further suppresses an increase in power consumption due to demodulation and extraction of the program attribute information.
An object of the present invention is to provide a DM demodulation control device.

[0024]

Means for Solving the Problems and Effects of the Invention According to a first aspect of the present invention, a BC data including a plurality of or one program is composed of a plurality of multiplexed TDM bit streams, First and second TDM demodulators for demodulating program attribute information and digital audio signals of the program, an audio decoder for decoding digital audio signals, data recording means for recording program attribute information, and a controller. The control unit sequentially sends the program attribute information of all programs to the second TDM demodulation unit.
The first TDM demodulation unit demodulates and extracts the digital audio signal of the program based on the program attribute information recorded in the data recording unit according to the user's selection of the program. , An audio decoding unit.

Thus, the reproduction of the audio signal of the desired program by the first TDM demodulator and the acquisition of all the BC data and the program attribute information included in the program by the second TDM demodulator are executed in parallel. Therefore, the program attribute information of all the newest programs is obtained without delaying the time required from turning on the power of the receiver to outputting the audio signal, and without interrupting the audio signal currently being reproduced. be able to.

A second invention is dependent on the first invention,
The control unit instructs the second TDM demodulation unit to sequentially instruct demodulation of program attribute information and extracts the program attribute information, and performs intermittent operation during a period for recording in the data recording unit and a period for suspending demodulation. It is. Thereby, the power consumption of the second demodulation unit can be suppressed.

A third invention is dependent on the first invention,
The control unit creates an electronic program guide based on the program attribute information stored in the data recording means, and displays the electronic program guide on a display screen. This allows
The user can efficiently select a program by browsing the newest electronic program guide generated based on the program attribute information.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A TDM demodulation control device according to an embodiment of the present invention will be described with reference to FIG. TD
The M demodulation control device DCp includes an antenna 2, a first TDM demodulator 6a, a second TDM demodulator 6b, an audio decoder 8, a controller 10, a key controller 12, a display 14, a data recorder 18, and A D / A converter 16 is included. The antenna 2 receives a radio wave broadcast from a satellite. Tuner 4
Tunes to a specific channel wave of the broadcast wave received by the antenna 2 and performs QPSK demodulation to generate TDM data St which is a QPSK signal.

The first TDM demodulator 6a has one BDM multiplexed on the TDM data St input from the tuner 4.
Digital content data D of the program included in the C data
ad and program attribute information Ipr1 are extracted. First TDM
The demodulator 6a is the TDM demodulator 2 described with reference to FIG.
It has the same configuration as 06. The second TDM demodulator 6b is
As with the first TDM demodulator 6a, only the program attribute information Ipr2 of the program included in one BC data multiplexed on the TDM data St input from the tuner 4 is extracted. As described above, the second TDM demodulator 6b outputs the first TDM signal.
Unlike the DM demodulator 6a, since only the program attribute information Ipr2 is extracted from the TDM data St, the configuration may be such that elements required only for extracting the digital content data Dad from the first TDM demodulator 6a are removed. Although the configuration is redundant, it goes without saying that the second TDM demodulator 6b may have the same configuration as the first TDM demodulator 6a.

The controller 10 determines a broadcast name and a broadcast name based on the program attribute information Ipr1 input from the first TDM demodulator 6a.
Electronic program guide EPG that displays information such as program titles and song titles
Is generated. Display 1
4 is EPG data Depg input from the controller 10
Based on the TDM data St (program attribute information Ipr)
Is displayed and presented to the viewer. The D / A converter 16 includes the audio decoder 8
Is converted to an analog audio signal Sa.
The data recorder 18 has a first TDM demodulator 6a and a second TDM demodulator 6a.
The program attribute information Ipr1 and Ipr2 extracted by the TDM demodulator 6b are recorded.

FIG. 6 shows the key operation device 12 and the display device 14.
And an example of the key operation device 12. In addition, in the same example, it is configured integrally with the key operation device 12. The key operation unit 12 includes an UP key 12a and a DOWN key 12b used for selecting a program, and a program confirmation key 12c for confirming a desired program. In addition, the display 14 displays on its display screen S the BC numbers, broadcast names, program names, and program numbers of all programs currently being broadcast.

The operation of the TDM demodulation control device DCp configured as described above will be described. The operations of the first TDM demodulator 6a and the second TDM demodulator 6b are the same as those of the TDM demodulator in FIG. Therefore, in this specification, the TD according to the present embodiment will be mainly described with respect to the processing of the controller 10.
The operation of the M demodulation control device DCp will be described. First, the main operation of the TDM demodulation control device DCp will be described with reference to the flowchart shown in FIG. First, the power of the TDM demodulation control device DCp is turned on, and the processing is started.

<Step S1> In step S1,
In order to execute the processing for the second TDM demodulator 6b, first, the initial state of the processing flag used inside the controller 10 is set to a predetermined state. In this example, the demodulation instruction flag Flag1 indicating the presence or absence of the demodulation operation instruction is set to 1, that is, “demodulation operation instruction is present”, and the demodulation pause time Ta, which is a parameter indicating the pause time of the demodulation operation, is set to 0. .

The presence or absence of the demodulation operation instruction is controlled by the controller 10 to the second TDM demodulator 6b by a hard reset or an instruction to stop and start the master clock. When the operation pause time Ta is 0, it indicates that the pause of the demodulation operation has ended, and the operation pause time Ta
Is not 0, it indicates that the demodulation operation is in a pause state. Then, the process proceeds to the next Step M1.

<Step M1> In step M1, the sub-module 1 which is a subroutine processing for the first TDM demodulator 6a is executed. Hereinafter, the processing in step M1 will be described with reference to the detailed flowchart of the submodule 1 shown in FIG.

After the initial setting in step S1, it is first determined in step S2 of step M1 whether synchronization of the TDM frame is established. The synchronization is established to determine whether or not the synchronization of the data sequence following the frame synchronization signal located at the beginning of the TDM frame of the configuration data A shown in FIG. 4 is correct. In step 3, the control unit I / F 107 detects a request command from the controller 10 and acquires the request command from the frame synchronization unit 102.
If the determination is No, the process exits from sub-module 1 and proceeds to step S5 (FIG. 8). On the other hand, if Yes, that is, if it is determined that synchronization has been established, the process proceeds to the next step S3.

In step S3, a BC number is obtained from the program attribute information (program attribute information Ipr1). Then, the process proceeds to the next step S4. The BC number acquired from the program attribute information Ipr1 is the B number of the configuration data A in FIG.
C configuration information. Then, the program attribute information Ip
In r1, the program number, the program name, etc.
C configuration information. At this stage, only the BC numbers and the program numbers and program names existing in one of the BC numbers can be obtained, and the program numbers and program names existing in the other BC numbers cannot be obtained.

The acquired program attribute information Ipr1 is shown in FIG.
After detecting the request command from the controller 10 by the control unit I / F 107 shown in (1), the control unit I / F 107 acquires the program attribute information from the BC selection / extraction unit 103 and the program selection / extraction unit 106. Output. In step S4,
The controller 10 stores the first acquired BC number and program number in the first
Is instructed to select the TDM demodulator 6a (Sc). Then, the process proceeds to the next step S5 (FIG. 8).
Proceed to. Note that the above-described sub-module 1 includes the second TD
This is a shared module that performs the same processing for the M demodulator 6b, and its operation will be described later.

<Step S5> In step S5,
The controller 10 determines whether the acquisition of the BC numbers of all the broadcasting stations included in the TDM data a has been completed. B
The completion of the acquisition of the C number is determined by the BC of the configuration data A shown in FIG.
The determination is made by detecting the total number of BC numbers included in the configuration information. If the acquisition of the BC number has not been completed, it is determined as No, and the process skips the sub-module 2 and the sub-module 3 to be described later and proceeds to step S25
Proceed to. Thereby, when the BC number is changed on the broadcast station side, or when the establishment of frame synchronization is not obtained and all the BC numbers cannot be completely acquired from the first TDM demodulator 6a, the process proceeds to an infinite loop. Avoiding rush. On the other hand, if the acquisition of the BC number has been completed, Yes
Is determined, the process proceeds to the next submodule 2.

<Step M2> In step M2, control for outputting an audio signal of a desired program based on the program configuration information Ipr1 obtained from the first TDM demodulator 6a, and display of EPG data Depg of the program on the display unit 14 which is a subroutine to be displayed on the sub-module 14
Is executed. Below, the submodule 2 shown in FIG.
The process in step M2 will be described with reference to a detailed flowchart of FIG.

After the acquisition of all the BC numbers is confirmed (S5), in step S6 of step M2, the first TD
B selected by the controller 10 for the M demodulator 6a
The determination of the BC synchronization establishment and the SC synchronization establishment of the C number is performed. The establishment of the BC synchronization is based on the configuration data B shown in FIG.
This is to determine whether or not the synchronization of the data sequence following the BC synchronization signal located at the beginning of the C frame is correct. The result of the BC synchronization is determined by the control unit I / F 107 shown in FIG.
Detects a request command from the controller 10 and acquires it from the BC selection and extraction unit 103.

The SC synchronization is established to determine whether or not the synchronization of the data sequence following the SC synchronization signal located at the head of the configuration data C shown in FIG. 4 is correct.
As a result of the SC synchronization, a request command from the controller 10 is detected by the control unit I / F 107 in FIG.
06. Here, the configuration data C is data including a plurality of programs included in one broadcast data and program configuration information, and is a program selection and extraction unit 106 shown in FIG.
Corresponds to the data input to.

If either the BC synchronization or the SC synchronization has not been established, the sub-module 2 is terminated,
Processing proceeds to submodule 3 (FIG. 8). On the other hand, if both BC synchronization and SC synchronization are established, Y
It is determined as es, and the process proceeds to the next step S7.

In step S7, program attribute information Ipr1 of all programs included in one BC number for which synchronization has been established is obtained from the first TDM demodulator 6a.
Then, the process proceeds to the next step S8.

In step S8, the display 14 displays EPG data Depg indicating the contents of the program attribute information Ipr1 obtained from the first TDM demodulator 6a. Then, the process proceeds to the next step S9. Note that FIG.
5 shows a display example of EPG data Depg extracted from the program attribute information Ipr1 of programs included in all BC numbers. However, at the processing stage of step S8, only the program attribute information of the BC number 1 is acquired and the EPG
Data Depg is generated and displayed. Therefore,
The program attribute information of the BC numbers 2 and 3 and later are acquired and displayed in processing steps described later.

At the time of step S9, the news program having the BC number 1 and the program number 1, that is, the first program shown on the display screen S of the display unit 14 is already in step S4 (M1). Selected. Therefore, in step S9, the audio decoder 8
Thus, the digital audio data Da of the selected news program is decoded from the digital content data Dad and output to the D / A converter 16. D / A
The converter 16 converts the digital audio data Da into an analog audio signal Sa, and outputs the analog audio signal Sa to an audio device (not shown) to reproduce the audio.

That is, digital content data Dad, which is an MPEG audio signal of this program, is input from the first TDM demodulator 6a to the audio decoder 8, and the audio decoder 8 expands and decodes the MPEG audio signal (Dad). To generate digital audio data Da. The D / A converter 6 converts the digital audio data Da into an analog audio signal S which is an analog signal.
a and reproduce the audio. Then, the process proceeds to the next step M3 (FIG. 8).

<Step M3> Step M3 is a process for the second TDM demodulator 6b,
The sub-module 3 which is a subroutine of control for displaying and controlling intermittent operation is executed by acquiring the program attribute information Ipr2 of all the programs according to the instruction to select the C number and the program number.

The processing in step M3 will be described below with reference to the detailed flowchart of the submodule 3 shown in FIG.

After the analog audio signal Sa is generated (S9: M2), the controller 10 determines in step S11 whether or not a demodulation operation instruction is requested based on the state of the demodulation instruction flag Flag1. You.

When the demodulation instruction flag Flag1 is 1, it indicates that an operation instruction for demodulation is requested. Then, the process proceeds to the next step S12.

In step S12, the controller 10 sets the demodulation instruction flag Flag1 to 0. The controller 10 further instructs the second TDM demodulator 6b to release the hard reset, releases the demodulation pause state, and starts the demodulation operation of the second TDM demodulator 6b. Then, the process proceeds to the next step S13.

On the other hand, when it is determined in step S11 that the demodulation instruction flag Flag1 is 0, the process skips step S12 and proceeds to step S1.
Proceed to 3. In this way, when the demodulation instruction flag Flag1 is not 1 (the demodulation operation instruction has not been issued),
Continue the demodulation pause state.

In step S13, the demodulation pause time T
It is determined whether or not a is 0. When the operation pause time Ta is 0, that is, when the demodulation operation pause state has ended, it is determined as Yes, and the process proceeds to the next step S14.

In step S14, it is determined whether or not the acquisition of the BC numbers of all the broadcasting stations included in the TDM data a has been completed for the second TDM demodulator 6b. By detecting the last flag indicating whether or not the last BC number is included in the BC configuration information of the configuration data A shown in FIG. 4, it is determined that the acquisition of the BC number is completed. If the acquisition of the BC number has been completed, it is determined as Yes, and the process proceeds to the next step S18.

In step S18, the BC synchronization of the selected BC number with respect to the second TDM demodulator 6b is established and S
A determination of C synchronization establishment is made. When both BC synchronization and SC synchronization are established, it is determined as Yes, and the process proceeds to the next step S19.

In step S19, the program attribute information Irp2 of the program included in the BC number whose synchronization has been confirmed in step S18 is acquired. The acquired program attribute information Ipr2 is recorded by the data recorder 18. EPG created based on program attribute information Ipr2
The data Depg is displayed on the display 14. Then, the process proceeds to the next step S20.

In step S20, the second TDM
For the demodulator 6b, program attribute information Ipr2 of all programs
Is recorded in the data recorder 18. If the recording of the program attribute information Ipr2 of all the programs has not been completed, it is determined to be No, and the process proceeds to step S2.
Proceed to 1.

In step S21, the controller 10
The second TDM demodulator 6b is instructed to select the next BC number (Sc2). And the processing is sub-module 3
Ends, and the process proceeds to step S25 (FIG. 8).

On the other hand, if the operation suspension time Ta is not 0 in step S13, that is, if it is determined that the demodulation operation suspension is continued, the process proceeds to step S15. In step S15, the demodulation operation pause time Ta is decremented by one. Then, the process proceeds to step S16 of the next process.

In step S16, step S15
New operation pause time T obtained as a result of the subtraction process in
It is determined whether the time of a is 0 or not. If the new operation pause time Ta is not 0, that is, if the demodulation operation is paused, N
It is determined as o. Then, the processing ends the sub-module 3, and proceeds to step S25 (FIG. 8). On the other hand, if the new operation suspension time Ta is 0, that is, if the suspension of the demodulation operation has been completed, it is determined as Yes, and the process proceeds to step S24.

In step S24, the demodulation instruction flag Flag1 is set to 1, and it is determined that there is a demodulation operation instruction. Then, the processing ends the sub-module 3, and proceeds to step S25 (FIG. 8).

In steps S13, S15, S16 and S24 described above, the demodulation operation pause time Ta is monitored, and the demodulation operation is performed from each of the demodulation pause state and the pause continuation state of the second TDM demodulator 6b. This is a preparation process for shifting to start.

On the other hand, in step S14, if all the BC numbers have not been completely acquired in the second TDM demodulator 6b, it is determined as No, and the process proceeds to step M1R. In step M1R, the sub-module 1R, which is the same processing as the sub-module 1 which is a subroutine performed on the first TDM demodulator 6a in step M1, is executed by the second TDM demodulator 6b.
Done for That is, the sub-module 1R performs the process of acquiring the BC configuration information (S2, S3) and the process of instructing the selection of the BC number and the program number (S4) to the first TDM demodulator 6a shown in FIG. This is executed for the second TDM demodulator 6b. Therefore, for the sake of simplicity, illustration of a detailed flowchart of step M1R is omitted. By executing the sub-module 1R in step M1R, all BC numbers can be obtained from the second TDM demodulator 6b. Then, the processing ends the sub-module 3, and proceeds to step S25 (FIG. 8).

On the other hand, if the program attribute information Ipr2 of all programs is recorded in the data recorder 18 for the second TDM demodulator 6b in the above-described step S20, it is determined as Yes, and the processing is performed in step S20. Proceed to S22.

In step S22, the demodulation operation pause time Ta is newly set to "Ta = Ta", and preparation for starting the demodulation operation pause is made. Then, the process proceeds to the next step S23.

In step S23, the second TDM
A hard reset is instructed to the demodulator 6b to stop demodulation. And then, the processing is sub-module 3
Ends, and the process proceeds to step S25 (FIG. 8).

As described above, by executing the sub-module 3 in step M3 once, the second TD
During the demodulation operation of the M demodulator 6b, the recording of the program attribute information Ipr2 of the program included in one BC number on the data recorder 18 and the display of the EPG data Depg on the display 14 are performed. These series of processes are sequentially and repeatedly executed to record the program attribute information Ipr2 of the programs included in all the BC numbers in the data recorder 18 and to display the EPG data Depg on the display 14. . As a result, EPG data Depg extracted from the program attribute information Ipr of all programs can be displayed on the display screen S of the display device 14.

The program attribute information Ipr (Ipr
1, Ipr2), the demodulation operation pause time Ta is set, the demodulation pause state is entered during the time Ta, and after the pause state is released, the second TDM is resumed.
The process of acquiring the program attribute information Ipr of the program from the demodulator 6b is repeatedly performed. Accordingly, the broadcast station side sets the program attribute information Ipr
Is updated, or even when the previously acquired BC number is changed, the latest program attribute information Ipr can be acquired and the intermittent operation can be realized.

<Step S25> After completing the sub-module 3 in step M3, the process proceeds to step S25 shown in the main flowchart of FIG. In step S25, it is determined whether all the BC numbers have been acquired for the first TDM demodulator 6a. All B
When the acquisition of the C number is completed, it is determined as Yes, and the process proceeds to the next step S26. On the other hand, step S25
In, if acquisition of all BC numbers is not completed, it is determined as No, and the process returns to step M1 described above.
Then, the sub-module 1 for the first TDM demodulator 6a is executed. As a result, the broadcast station has a BC
When the numbers are changed, or when the establishment of frame synchronization is not obtained, and the acquisition of all BC numbers from the first TDM demodulator 6a cannot be completed, entry into an infinite loop is avoided.

In step S26, a key determination is made as to whether or not the enter key has been selected by the key operation of the key operation device 12 by the user. Key operation by the user
While viewing the EPG data Depg extracted from the program attribute information Ipr displayed on the display screen S (FIG. 6), the UP
This means that a desired program is selected by operating the key 12a or the DOWN key 12b. The program selection is confirmed by operating the program confirmation key 12c.

If it is detected that the program determination key 12c has not been selected, it is determined as No, and the process returns to step M3. Then, the processing of the submodule 3 for the second TDM demodulator 6b is executed. Thus, it is always determined whether or not the user has selected the program determination key 12c, and the second TDM demodulator 6b is notified of the program attribute information Ipr of the program included in another BC number.
2 demodulation and extraction processing are continued. On the other hand, step S26
When it is detected that the program confirmation key 12c has been selected, the process proceeds to the sub-module 4.

<Step M4> In step M4, the sub-module 4 which is a subroutine for instructing the first TDM demodulator 6a to select the program selected by the program determination key 12c in step S26 is executed. Hereinafter, the detailed operation of the submodule 4 in step M4 will be described with reference to FIG.

First, in step S27, the output of the digital audio data Da from the audio decoder 8 is stopped. Then, the process proceeds to the next step S28.

In step S28, the first TDM demodulator 6a is instructed to select a desired program (Sc
Perform 1). As a result of the processing in step S27, the output of the digital audio data Da of the desired program from the audio decoder 8 is stopped at this time. This prevents noise in the digital audio data Da due to the program selecting operation in this step. Then, the process returns to step S5 described above.

The output of the audio signal of the desired program is started by the first T in the determination processing in step S5.
When all the BC numbers have been acquired from the DM demodulator 6a, the instruction has been issued in step S9 of the next submodule 2, and the user can listen to the audio sound of the desired program.

As described above, according to the present invention, the first TD
Reproduction of an audio signal of a desired program by the M demodulation unit;
Since the acquisition of all the BC data and the program attribute information included in the program by the second TDM demodulation unit are executed in parallel, the time required from the power-on of the receiver to the output of the audio signal is not delayed, and furthermore, In addition, the program attribute information of all the newest programs can be acquired without interrupting the currently reproduced audio signal. Therefore, there is an advantageous effect that the user can always browse what program to select using the latest electronic program guide.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a TDM demodulation control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a TDM demodulation control device according to a conventional form.

FIG. 3 is a configuration diagram of a TDM demodulation unit.

FIG. 4 shows configuration data at each demodulation stage of a TDM demodulation unit.

FIG. 5 shows a conventional display screen and a key operation unit.

FIG. 6 shows a display screen and a key operation unit of the present invention.

FIG. 7 is a configuration diagram of a transmitter.

FIG. 8 is a main flowchart showing a processing procedure executed by a controller 10 of FIG. 1;

FIG. 9 is a sub-module 1 of a main flowchart showing a processing procedure executed by the controller 10 of FIG. 1;

FIG. 10 is a sub-module 2 of the main flowchart showing a processing procedure executed by the controller 10 of FIG. 1;

11 is a sub-module 3 of a main flowchart showing a processing procedure executed by the controller 10 of FIG. 1. FIG.

FIG. 12 is a sub-module 4 of a main flowchart showing a processing procedure executed by the controller 10 of FIG. 1;

[Explanation of symbols]

 DCp, DCc TDM demodulation controller 2, 202 Antenna 4, 204 Tuner 6a, 6b, 206 TDM demodulator 8, 208 Audio decoder 10, 210 Controller 12, 212 Key operator 14, 214 Display 16, 216 D / A converter 18 Data recorder

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) H04N 7/03 7/035 F term (reference) 5C025 AA30 BA27 CA09 CB05 CB08 DA01 5C063 AB07 AC01 AC05 AC10 CA12 CA20 CA34 DA03 EB03 EB22 EB33 5K061 BB06 BB10 DD02 DD12 FF04 FF05 FF06 JJ07

Claims (3)

[Claims] 1. A method for demodulating program attribute information and a digital audio signal of one program included in one broadcast channel data from a TDM bit stream in which a plurality of broadcast channel data including a plurality of or one program are included and multiplexed. First and second TDM demodulators, an audio decoder for decoding the digital audio signal, data recording means for recording the program attribute information, and a controller. For the TDM demodulation unit, the program attribute information of all programs is sequentially demodulated and extracted, and is recorded in the data recording means, and is recorded in the data recording means by a user's program selection. The digital audio signal of the program based on the program attribute information is demodulated by the first TDM demodulation unit and decoded by the audio decoding unit. TDM characterized by
Demodulation control device. 2. The control unit instructs the second TDM demodulation unit to sequentially instruct the second TDM demodulation unit to demodulate and extract the program attribute information, and records the program attribute information in the data recording unit, and a period during which demodulation is paused. The TDM demodulation control device according to claim 1, wherein an intermittent operation is performed. 3. The control unit according to claim 1, wherein the control unit creates an electronic program guide based on the program attribute information stored in the data recording unit, and displays the electronic program guide on a display screen. 3. The TDM demodulation control device according to 1.