JP4095141B2 - Broadcast signal receiving apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a broadcast signal receiving apparatus and method, and more particularly, as a data format entity for multiplexing predetermined information on an FM audio signal, by multiplexing information to be delivered in a description format used in a multimedia network. The present invention relates to a broadcast signal transmitting apparatus and method for receiving a broadcast signal.
[0002]
[Prior art]
In recent years, as a method for using FM radio broadcasting, so-called “visible radio” that transmits character information together with FM audio signals using broadcast waves has been commercialized. This type of device is highly portable and can receive a variety of information in a place where FM waves can be received with a very simple circuit.
[0003]
Information currently transmitted using FM audio broadcasting includes news and weather forecasts, which can be received via a so-called multimedia network. For this type of information, “visible radio” is available. Can be easily obtained. In addition, it is more portable than a general multimedia terminal.
[0004]
It is also conceivable to transmit general data in place of the character information or to transmit data that can be handled by a PC.
[0005]
[Problems to be solved by the invention]
However, in this type of receiving device, currently existing devices only display simple character information such as the weather forecast described above, and it is easy to use such a character information on a PC. The advent of a portable receiver capable of handling information by the description method used in multimedia networks that can be handled easily is desired.
[0006]
Moreover, simply receiving this kind of information in addition to character information in a portable device not only makes it impossible to use the data effectively, but also power saving desired as a portable device for handling these two pieces of information. There was even a concern that it would hinder downsizing and downsizing.
[0007]
The present invention has been made under such a background, and in particular, effectively receives and uses information that can be easily handled by a general-purpose processor in addition to information multiplexed in accordance with a broadcast signal. It is another object of the present invention to provide a completely new broadcast signal receiving apparatus and method that do not hinder downsizing and power saving.
[0008]
[Means for Solving the Problems]
The broadcast signal receiving apparatus of the present invention defines a header part in the delivered information and a program number of the delivered information in order to multiplex and divide the delivered information in the HTML description format into an FM signal. A first error correction code is generated for the first data group composed of program number information to be executed and block number information indicating the block number, and the first error correction code is added. Regarding the second data group composed of the first data group, identification information for identifying the data type of the delivered information, an error detection code for detecting an error in the identification information, and the prefix of the block An apparatus for receiving an FM signal in which a second error correction code different from the first error correction code is generated and the delivered information to which the second error correction code is added is multiplexed. A second error correction processing means for performing error correction processing on the second data group using the second error correction code when the FM signal is received; and Input means for inputting a signal to be output to the outside, and when the signal is input to the input means, using the first error correction code, Of the data subjected to error correction processing using the second error correction code by the second error correction processing means And a first error correction processing means for performing error correction processing on the first data group.
[0009]
In the broadcast signal transmission method of the present invention, in order to multiplex and divide the delivered information in the HTML description format into the FM signal, the header portion in the delivered information and the program number of the delivered information are defined. A first error correction code is generated for the first data group composed of program number information to be executed and block number information indicating the block number, and the first error correction code is added. Regarding the second data group composed of the first data group, identification information for identifying the data type of the delivered information, an error detection code for detecting an error in the identification information, and the prefix of the block When receiving a FM signal in which a second error correction code different from the first error correction code is generated and the delivered information to which the second error correction code is added is multiplexed. A second error correction processing step of performing error correction processing on the second data group using the second error correction code when the FM signal is received; and outputting the delivery target information to the outside An input step of inputting a signal to the input means, and when the signal is input to the input means by the input step, using the first error correction code, Of the data subjected to error correction processing using the second error correction code in the second error correction processing step And a first error correction processing step for performing error correction processing on the first data group.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
First, the broadcast signal premised on the broadcast signal receiving apparatus and method of the present invention will be described.
[0018]
FIG. 6 is a block diagram showing a schematic configuration of a broadcast signal transmitting apparatus premised on the present invention described above, and shows an apparatus installed in a radio broadcasting station.
[0019]
In FIG. 6, reference numeral 1 denotes an operation unit of a personal computer (PC), 2 a display unit thereof, and 3 a PC main body. This PC is connected to the bus B, and can receive the longevity of data from the bus B. Here, an image memory 4, a formatter memory 5, an Internet server 6, a JPEG encoder 7, an HTML memory 8, an error correction code (ECC) encoding circuit 9 and the like are connected to the bus B.
[0020]
On the other hand, as an audio signal input from various known audio devices and to be FM broadcast, a stereo audio signal and a monaural (M) audio signal including a right (R) signal and a left (L) signal are assumed. In FIG. 6, reference numeral 11 denotes a matrix circuit that receives the R signal and the L signal and outputs a sum signal (L + R) and a difference signal (LR). The sum signal (L + R) is input to one of the switches 12. It is said. A monaural signal (M) is input as the other input of the switch 12, a monaural signal (M) is output in the case of monaural broadcasting, and a sum signal (L + R) is output in the case of stereo broadcasting.
[0021]
A pilot signal having a predetermined frequency is output from the pilot signal generating circuit 16 in conjunction with the switching of the switch 12. On the other hand, the frequency of the difference signal (LR) is converted by the balanced modulation (BM) circuit 13 and multiplexed by the multiplexing circuit 17 with the output of the switch 12 and the pilot signal. Here, the frequency allocation of each signal will be described with reference to FIG.
[0022]
As shown in FIG. 7, the sum signal (L + R) or monaural signal (M) is arranged in the baseband, and the difference signal (LR) is frequency-converted by the balanced modulation circuit 13 with a 38 KHz carrier wave as shown in the figure. Arranged in the band. Although not shown, it goes without saying that a band pass filter (BPF) for cutting off unnecessary bands is arranged at the output stage of the balanced modulation circuit 13.
[0023]
In this example, digital data is converted into a binary analog signal via the D / A converter 14 via the bus B described above, and this analog signal is input to the balanced modulator 15 to generate a 76 kHz carrier wave. The frequency conversion is performed at a frequency higher than that of each voice signal or pilot signal, and the multiplexing circuit 17 can perform frequency multiplexing with these. This multiplexed signal is standardized for data for publicly known teletext broadcasting. In this example, the data in the HTML format used in the WWW (World Wide Web) using this multiplexed signal. Is transmitted as a broadcast wave.
[0024]
Here, the data format of the text broadcast using the conventional FM radio broadcast will be described with reference to FIG. As shown in the figure, the data arranged in a matrix format is a 16-bit block identification code followed by a 16-bit prefix, 160-bit character data, and further a 14-bit CRC, and the sum of the prefix, character data, and CRC. A parity check code of 82 bits is added to 190 bits, and an error correction code having a code length of 272 bits is configured.
[0025]
Here, the block identification code is provided as synchronization data in order to identify the boundary of the block, the location of the block is identified by this code, and block synchronization is established. The 16-bit prefix is configured as shown in FIG. 9, and includes 4-bit service identification data, 1-bit decoding identification data, 1-bit information end data, 2-bit update data, 4-bit data group It consists of a number and a 4-bit data packet number.
[0026]
Here, the service identification data indicates the content of the teletext service, that is, the type of program content (character, graphic information, additional information, auxiliary signal, operation signal) and transmission mode. By the way, there are already 10 types of service identification data already defined in teletext, and the remaining 6 types are undefined. Therefore, in this embodiment, it is specified that one of these six types is a service for broadcasting data in the HTML format. Actually, “0111”, “1000”, “1001”, “1010”, etc. are undefined data.
[0027]
The decoding identification data is data for distinguishing between the case where error correction requires only decoding in the row direction in FIG. 8 and the case where decoding of product codes in the row direction and column direction is required. The information end data is data for identifying whether or not it is the last block of each data group, and the update data is data indicating the number of times the contents of the data group are updated.
[0028]
In this example, as described above, the service identification bit is used to confirm that the program is an HTML format data program, and the update data is used to update the past data of the same group. Whether it is identifiable.
[0029]
FIG. 10 is a diagram showing a format of data to be transmitted in this example, and takes a format compliant with the above-mentioned teletext format. As shown in the figure, 4-bit identification data (DID) is provided immediately after the prefix. This DID indicates whether the data of the block is character data conforming to the HTML format, image data, or header, and the character data or image data is compressed data Is data defining the compression method. If this data DID is erroneous during transmission, data of unknown meaning will be reproduced. In this example, whether or not a code error during transmission has occurred in the 4-bit identification code. In order to reliably detect the error, a dedicated CRC code is arranged subsequent to the identification data DID to reliably detect a code error generated in the identification data.
[0030]
As shown in FIG. 10, 168-bit actual data can be transmitted in each block. However, in this example, the data format is different for the HTML header portion, character data, and image data. The format of each data is shown in FIG. As shown in FIG. 11A, for the block that transmits the HTML header, 32 bits in 168 bits are assigned to a parity that forms an error correction code different from the 82-bit parity shown in FIG. . That is, the previous 82-bit parity is added to 190-bit information data to form a 272-bit error correction code, but this 32-bit parity is a 16-bit program code, a 16-bit packet code, and a 104-bit HTML. It is added to the header to form a 168-bit error correction code.
[0031]
Here, since the program code, packet code, HTML header, and parity are all integer multiples of 8 bits, the 168 bit error correction code using the 32-bit parity can be processed in units of 8 bits. A Reed-Solomon code or the like can be applied. Thus, by using an error correction code that can be processed in units of 8 bits, it is possible to shorten the processing time, reduce the circuit scale, and the like.
[0032]
The program code is the same data as the data group number in the above-described teletext, defines the program number of the HTML data to be broadcast, and defines a program for 2 to the 16th power. The packet code indicates a serial number in each program of each data block (packet), and a number corresponding to 2 to the 16th power can be added so that a packet number can be given even for a considerably long sentence or a fairly detailed image. I am doing so.
[0033]
Next, a block (packet) including actual information data (entity) such as character data and image data will be described. As is well known, with respect to image data, even if there is a code error on the transmission path, if the data of the pixel adjacent to the pixel corresponding to the data in which the error has occurred can be restored, a sufficiently visible image can be restored. it can. Considering this point and the large amount of data in the first place, as shown in FIG. 11C, the image data can be transmitted using all 134 bits.
[0034]
On the other hand, for character data, when erroneous correction occurs due to the above-mentioned 82-bit parity, in order to avoid the fact that the character itself becomes unclear, it is the same 14-bit as used in well-known character broadcasting. CRC is added. In this way, by using a CRC configuration similar to that of a well-known teletext, existing resources can be used effectively. Further, a common circuit for normal teletext and the transmission of HTML data according to the present embodiment. Can be used.
[0035]
Here, the amount of data actually transmitted will be described. As is well known, the header of HTML data includes a request method, a general message header (general header), a request header, a response header, an entity header, and the like, but in a broadcast application such as this embodiment, a general header and a response header. It will be clear that at least an entity header is required.
[0036]
In this example, at least Date (date and time when the message was generated) as a general header, Server (name of server software) as a response header, and WWW-Authenticate (when the server uses an authentication mechanism) Authentication method) Content-length (size of entity body), Content-Encoding (method of object compression, encryption, package), Content-Transfer-Encoding (encoding performed when transferring data) as entity header Method) is sent as this header data. The data amount is considered to be about 100 characters in 8-bit alphabet data, that is, about 800 bits. Although the amount of data in the header portion varies depending on the program, as shown in FIG. 11A, 104 bits of data can be transmitted in one block, so it is generally less than 10 blocks.
[0037]
On the other hand, the character data naturally varies depending on the length of one program. For example, the LCD screen size for display is about (480 × 240) dots, one dot is 0.24 mm, and 12 points ( Assuming a device that displays a type of 5 mm × 5 mm), character data of about (23 × 11) characters is sent. The amount of data required in this case is (16 × 23 × 11 =) 4048 bits assuming that Japanese is expressed in JIS code, and 33 to 34 blocks are required according to the format of FIG. Further, assuming a standard A4 document (16 × 40 × 30 =) 19200 bits, about 160 blocks are required. Here, since the data matrix forming one product code shown in FIG. 10 can transmit 190 blocks of data, the above-mentioned HTML header and character data of about A4 occupy almost one matrix.
[0038]
Next, image data will be described. As image data, for example, when a signal corresponding to one field of a normal television signal such as an NTSC signal is transmitted, the number of pixels is, for example, (240 × 320 =) 76800 pixels. If all the pixels are quantized with 8 bits of pixels, and the two color signals Cb and Cr are subsampled to 1/4 and then quantized with 8 bits of each pixel, the total number of bits before compression coding Is (76800 + 76800/4 + 76800/4) × 8, that is, 384K bits. In this embodiment, compression is performed by the JPEG method as described later, and this is reduced to about 50K bits. Here, as shown in FIG. 11C, since the number of image data that can be transmitted in each part lock is 174 bits, image data for one screen can be transmitted in about 290 blocks.
[0039]
FIG. 12 shows the data matrix of FIG. 10 rewritten in accordance with the order of data actually transmitted in the apparatus of this embodiment. This embodiment is shown in FIG. 12 and the flowchart of FIG. The operation of the example transmission apparatus will be described below.
[0040]
When a process for multiplexing HTML data to a broadcast signal is commanded by operating the operation unit 1, the computer 3 displays a guidance display on the display unit 2 to instruct an input by the operation unit 1 and starts a process according to 8 (step S1). ). Here, the user inputs characters using the operation unit 1 while viewing the display on the display unit 2, or calls a desired HTML file from the Internet server 6 and stores it in the HTML memory 8 via the bus B. When inputting image data, the desired screen data is similarly called as bitmap data from the Internet server 6 and stored in the image memory 4 via the bus B. Since these series of operations are not directly related to the present invention, they are defined as an input subroutine (step S2) in the flowchart of FIG.
[0041]
When the storage of the data in the image memory 4 and the HTML memory 8 is completed, the HTML header data stored in the HTML memory 8 is transferred to the ECC encoder 9 in accordance with an instruction from the computer 3, and the header shown in FIG. A process of forming a 32-bit parity with respect to the 104 bits of the copy is started (step S3). Here, the ECC encoder 9 incorporates a 16-bit Risc processor or the like, and is configured to be able to perform error correction coding without any processing by the computer 3. Therefore, while the computer 3 is performing the processing from step S4 in the flowchart of FIG. 13, the parity calculation processing by the ECC encoder 9 is performed in parallel.
[0042]
If character data exists (step S4), processing for adding a 14-bit CRC to the 122-bit character data shown in FIG. 11B is performed in the computer 3 (step S5). If the image data exists (step S6), the CRC adding process is interrupted, the image data stored in the image memory 4 is supplied to the JPEG encoder 7, and the compression process using the JPEG method is performed. (Step S7). Here, the JPEG encoder 7 is configured by a hardware chip, and can be processed in parallel with the CRC forming process in step 5.
[0043]
When the JPEG compression process is started, writing of the compressed data subjected to the JPEG process, HTML header data to which parity is added, and character data to which CRC is added to the formatter memory 5 is started (step S1). S8). Each data is written in the formatter memory 5 in an array according to the transmission format of FIG.
[0044]
As shown in FIG. 12, transmission is performed from the block in which the header portion is stored, and the first 13 blocks and 137 to 149 blocks in the transmission data matrix shown in FIG. 12 do not transmit parity blocks. Send only data blocks. In addition, the block in which the header part data is arranged is continuously transmitted from the first block and the 137th block, and when the amount of data including this header part exceeds 136 blocks, it is repeatedly transmitted a plurality of times. become. In this way, in this embodiment, the header part of HTML is transmitted as soon as possible, and when the file is large, it is configured to repeatedly transmit a plurality of times, so that the receiving side can be faster and more reliable. It is devised to obtain highly reliable HTML header data.
[0045]
In FIG. 13, when it is detected in step S9 that all data has been written to the formatter memory 5 (step S9), in step S10, the header of the 104-bit HTML data stored in the formatter memory 5 is displayed. 82-bit parity is calculated by the ECC encoder 9 for 190-bit data including 32-bit parity, and a 288-bit data block obtained by adding a block identification code to 272 bits is output. Here, the 190-bit data includes the group identification code (DID), 2-bit CRC, 16-bit program code (PGC) and packet code (PKC) shown in FIG. Including a prefix (PFX).
[0046]
In this way, when one header block is transmitted, a counter (not shown) provided in the computer 3 counts up, and the number of transmitted blocks is counted. When the data of the header portion is completed (step S11), the image data block or the character data block is transmitted (step S12). Although FIG. 7 shows that the character data block is transmitted first and then the image data block is transmitted, it goes without saying that this order depends on the configuration of the HTML file that is actually transmitted. .
[0047]
Here, as described above, data blocks are continuously transmitted up to the 13th block and no parity block is transmitted. However, after the 14th block, one parity block is transmitted to 3 blocks. That is, when it is detected in step S13 that the 14th block or the 150th block will be transmitted next in step S13, another count in the computer 3 is incremented, and this count value is When two more data blocks (image or character data) are transmitted with reference to (step S14), a parity block is transmitted (step S15). Here, for this parity block, the data into the formatter memory in step S9 The calculation is started by the ECC encoder 9 from the point of time when the writing is completed, and the data is sequentially written in the formatter memory 5.
[0048]
When the parity block is transmitted, it is confirmed whether the next block to be transmitted is the first block or the 137th block in the data matrix of FIG. 7 (step S16). It is confirmed whether or not the processing has been completed (step S17). If the data has not been completed, the transmission of the two data blocks and the transmission of one parity block are repeated in steps S12 to S15.
[0049]
Next, when the block to be transmitted is the first block or the 137th block, the process returns to step S10 and the header blocks are continuously sent again. This operation is performed until it is detected in step S17 that the data to be sent has been completed, and the processing is terminated when the data to be sent is completed (step S18). The transmission data sequentially output from the bus B to the D / A converter 14 in accordance with the data format of FIG. 12 is multiplexed with the FM broadcast audio signal by the multiplexing circuit 17 as described above, and further the FM of FIG. The modulation circuit 18 performs FM modulation with a broadcast carrier, and transmits the broadcast wave through the transmission control circuit 19.
[0050]
Thus, in the apparatus of this example, HTML data can be transmitted while maintaining compatibility with the conventional FM radio broadcast character data transmission function. In the above embodiment, the redundancy of the HTML header portion is set higher than that of other data, an error correction code is added, and the error correction code used in the conventional character broadcasting is also used. Therefore, the reliability of the header portion of the HTML data is equivalent to that in the case of transmitting through another network. In addition, the occurrence of a berth and error peculiar to a broadcast wave can be dealt with by transmitting this header portion a plurality of times, and overall high reliability can be obtained.
[0051]
Further, since the redundancy for error detection or correction is switched between the image and the character, necessary data can be transmitted with the minimum redundancy, and high reliability can be ensured as a whole.
[0052]
Hereinafter, the receiving apparatus of the present invention that receives the broadcast signal as described above will be described in detail.
[0053]
FIG. 1 is a block diagram showing an outline of a receiving apparatus according to the present invention for receiving the broadcast signal, and FIG. 2 is a perspective view showing an appearance thereof. As shown in FIG. 2, this receiving apparatus is a portable apparatus of approximately FM radio, and can be connected to a personal computer or the like via an interface 80 compliant with, for example, a PCMCIA card.
[0054]
In FIG. 2, 101 is a portable receiver main body, and 102 and 103 are manual operation keys for executing a display command and an external output command, respectively, corresponding to the operation unit 98 of FIG. 51 is a retractable antenna, 93 and 94 are a pair of speakers capable of outputting stereo audio signals, 96 is a flat panel display, 80 is an external interface compliant with the PCMCIA card, 99 is received and output to an external device. This is an indicator that indicates that unformatted HTML data is stored in the main body.
[0055]
In FIG. 1, a broadcast wave received by an antenna 51 is selected by a receiving unit 52, detected by an FM detection circuit 53, and converted into a multiplexed signal as shown in FIG. Here, the band pass filter (BPF) 54 separates the above-described pilot signal and supplies the separated pilot signal to the detection circuit 55. The output of the detection circuit 55 is compared with a predetermined threshold value by the comparison circuit 56, and it is determined whether the audio signal being broadcast is a stereo signal or a monaural signal according to the comparison result.
[0056]
On the other hand, in the low-pass filter (LPF) 60, the baseband signal in FIG. 7 is extracted and supplied to the matrix circuit 59 as a monaural signal or a sum signal of stereo sound. Further, the BPF 58 extracts a signal carried by a 38 KHz carrier wave, returns it to a baseband signal, that is, a stereo audio difference signal by the balanced modulator 58, and supplies it to the matrix circuit 59. When receiving a stereo broadcast from the matrix circuit 59, a right (R) signal and a left (L) signal of stereo sound are output, and the switches 61 and 62 controlled by the output of the comparison circuit 56 are output. Is output.
[0057]
On the other hand, when the received broadcast is a monaural broadcast, both the switches 61 and 62 output the audio signal output from the LPF 60, and the monaural audio is output in the same manner. The audio signal output from the switches 61 and 62 is output from the speakers 93 and 94 via the amplifiers 91 and 92.
[0058]
On the other hand, the above-mentioned data signal multiplexed on the carrier of 76 KHz is separated by the BPF 72 and converted into a signal corresponding to the data string of the data format as shown in FIG. This signal is supplied to a clock extraction circuit 71 to form a free-running clock, which is digitized by an AD converter 74 using this clock and converted into original digital data by a known data detection circuit 75. Here, the data detection circuit 75 includes a well-known integration detection circuit, an equivalent circuit, a decoding circuit using a partial response, and the like.
[0059]
The operation of the apparatus according to the present embodiment when receiving the conventional text broadcast related to the data format of FIG. 8 will be described. Here, as described above, the conventional teletext broadcasting is also transmitted with the parity arrangement as shown in FIG.
[0060]
The data detected by the data detection circuit 75 is discharged as a data string to the reception-side bus RG and stored in the reception memory 77 under the control of the CPU 85. Similarly, the ECC decoding circuit 76 accesses the data in the reception memory 77 under the control of the CPU 85, and performs error correction using the product code parity described above. Here, this error correction processing is performed using 82-bit parity for each data block, and subsequently, error correction processing using 82-bit parity distributed in the vertical direction in FIG. 12 is performed. Is called.
[0061]
The character information subjected to the error correction processing in this way is transferred to the storage memory 78. Next, by operating the display command switch 102 shown in FIG. 2, the character data in the storage memory 78 is written into the display memory 95 while being converted into a display code, and the characters are displayed on the display 95. .
[0062]
FIG. 3 is a flowchart for explaining the operation at the time of reception of the above-described HTML data in the receiving apparatus of the present embodiment. Hereinafter, description will be given along the flowchart.
[0063]
When reception by the reception unit 52 is started (step S101), the data detected by the data detection circuit 75 is discharged to the reception-side bus RG as a data string according to the data format shown in FIG. The data is stored in the memory 77 according to the format of FIG.
[0064]
When one line (one data block) of the data matrix in FIG. 12 is accumulated in the reception memory 77 (step S103), the ECC decoding circuit 76 starts to access the data in the reception memory 77 under the control of the CPU 85. To do. That is, first, error correction processing is performed using an outer code parity of 82 bits for each data block (step S104).
[0065]
Here, the operations in steps S103 and S104 are repeated until the entire data matrix shown in FIG. 12 is accumulated in the reception memory. When all the data matrixes in FIG. 12 are accumulated (step S106), the ECC decoding circuit 76 starts accessing the data in the reception memory 77 again. Here, error correction processing using 82-bit inner code parity distributed in the vertical direction in the data matrix of FIG. 12 is performed (step S107).
[0066]
When the processing of one data matrix using the outer code parity and the inner code parity is completed, the data is transferred from the reception memory 77 to the storage memory 78 and whether all the data to be received has been received or not. Is confirmed (step S108), and when the reception is completed, the display of the indicator 99 described above is turned on, that is, turned on (step S109), and the process is terminated (step S110).
[0067]
FIG. 4 is a flowchart for explaining the operation when the display command switch 102 is pressed when the HTML data is stored in the receiving apparatus of this embodiment. explain.
[0068]
When the display command switch 102 is turned on (step S121), scanning of data stored in the storage memory 78 is started under the control of the CPU 81 (step S122). This scanning is performed for each line, and the accumulated data is processed for each line under the monitoring of the CPU 81. Here, the CPU 81 monitors whether the data of each line subjected to the error correction processing by the product code is character data, image data, or header data, and the line data to be processed. Is character data (step S123), the data of this line is supplied to the ECC decoding circuit 76, and the presence or absence of an error is detected by the 14-bit CRC shown in FIG. 11B (step S124). Character data for which no error has been detected is written into the display memory 95 after being expanded into bitmap data (step S127).
[0069]
On the other hand, when the data of the line to be processed is image data (step S125), the image data is received because the mobile terminal device alone of this embodiment cannot display an image. A character indicating this is generated (step S126), and bit map data of this character is written into the display memory 95 in step S127.
[0070]
When all the lines have been scanned (step S128), the bitmap data stored in the display memory 95 is displayed as characters on the display 96 as described above (step S129), and the process is terminated (step S130). . Note that when the data of the line to be processed is an HTML header portion, it cannot be used in the portable terminal device, and therefore error correction processing or writing to the display memory 95 is not performed.
[0071]
FIG. 5 is a flowchart for explaining the operation when the external output command switch 103 is pressed when the HTML data is accumulated in the receiving apparatus of this embodiment. I will explain.
[0072]
When the external output command switch 103 is turned on (step S141), scanning of data stored in the storage memory 78 is started under the control of the CPU 81 (step S142). This scanning is performed for each line, and the accumulated data is processed for each line under the monitoring of the CPU 81. Here, the CPU 81 monitors whether the data of each line subjected to the error correction processing by the product code is character data, image data, or header portion data.
[0073]
If the line data to be processed is character data (step S143), the presence or absence of an error is confirmed by the 14-bit CRC shown in FIG. Detection is performed (step S144). Character data for which no error has been detected is output to an external device such as a PC for each line of the data matrix of FIG. 12 via the external I / F 80 conforming to the PCM-CIA card (step S147).
[0074]
On the other hand, when the data of the line to be processed is image data, the data is directly output to the PC or the like via the I / F 80 without performing any processing. If the line data to be processed is header data (step S145), an error correction process using 32-bit parity shown in FIG. The corrected data is output to the outside via the I / F 80 for each line.
[0075]
When all the lines have been scanned (step S148), the data matrix stored in the storage memory as described above is erased or overwritten, and the display of the indicator 99 is turned off. (Step S149), the process ends (Step S150).
[0076]
As described above, in the portable receiving terminal device of the present embodiment, error detection or correction processing necessary for the operation is performed at the time of reception, when the received data is displayed, and when the received data is output to an external device. Therefore, unnecessary processing is not performed on the apparatus.
[0077]
In addition, when data that cannot be handled by the apparatus of this embodiment or cannot be processed effectively is received, the received data is accumulated and an indicator indicating that the data is not output to the outside is turned on. Therefore, the operator can easily recognize such a state, and there is no fear that the received data is wasted.
[0078]
Further, in the apparatus of the present embodiment, the display device and the display command switch for displaying the characters of the conventional teletext broadcasting can be used as they are for displaying the characters received as HTML format data. Thus, the composite function as described above can be realized without increasing the size of the apparatus.
[0079]
It goes without saying that the image data supplied to the PC as described above is restored to the original image data by the JPEG decoder installed in the PC and processed according to the link recognized by the header portion.
[0080]
【The invention's effect】
As described above, according to the broadcast signal receiving apparatus and method of the present invention, information that can be easily handled by a general-purpose processor is effectively received and used in addition to information that has been multiplexed according to the broadcast signal. In addition, it is possible to obtain a completely new apparatus and method that do not hinder downsizing and power saving.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a receiving apparatus according to an embodiment of the present invention.
2 is an external perspective view of the apparatus shown in FIG.
FIG. 3 is a flowchart for explaining the operation of the apparatus of FIG. 1 when receiving HTML data;
4 is a flowchart for explaining an operation when a display command switch is operated in the apparatus of FIG. 1; FIG.
5 is a flowchart for explaining an operation when an external output command switch is operated in the apparatus of FIG. 1; FIG.
FIG. 6 is a block diagram showing a schematic configuration of a transmission apparatus that broadcasts a broadcast signal premised on the present invention.
7 is a diagram showing a frequency spectrum arrangement before FM modulation of a signal to be transmitted in FIG. 6;
FIG. 8 is a diagram showing a data format of teletext used conventionally.
FIG. 9 is a diagram showing details of the prefix portion shown in FIG. 8;
10 is a diagram showing a data format of HTML data transmitted by the apparatus of FIG. 6. FIG.
11 is a diagram showing a more detailed format of an HTML header, character data, and image data that are sent without permission in the format of FIG.
12 is a diagram showing a data format according to the transmission order transmitted by the apparatus of FIG. 6;
FIG. 13 is a flowchart for explaining the operation of the apparatus shown in FIG. 6;
[Explanation of symbols]
76 ECC decoding circuit
77 Receive memory
78 Storage memory
80 External interface
81 CPU
95 Display memory
96 display
98 Operation part
102 Display command switch
103 External output command switch
RB data bus

Claims (2)

In order to multiplex and divide the delivered information in the HTML description format in the FM signal into blocks, the header portion in the delivered information, program number information defining the program number of the delivered information, A first error correction code generated with respect to a first data group composed of block number information indicating a number, and the first data group to which the first error correction code is added; For the second data group consisting of identification information for identifying the data type of the delivered information, an error detection code for detecting an error in the identification information, and the prefix of the block, the first error correction code and Is a device for receiving an FM signal in which different second error correction codes are generated and the delivered information to which the second error correction code is added is multiplexed,
Second error correction processing means for performing error correction processing on the second data group using the second error correction code when the FM signal is received;
Input means for inputting a signal for outputting the delivered information to the outside;
When the signal is input to the input means, the first error correction code is used, and the second error correction processing means performs error correction processing using the second error correction code. broadcasting signal receiving apparatus characterized by comprising a first error correction processing means for performing error correction processing on the first data group out. In order to multiplex and divide the delivered information in the HTML description format in the FM signal into blocks, the header portion in the delivered information, program number information defining the program number of the delivered information, A first error correction code generated with respect to a first data group composed of block number information indicating a number, and the first data group to which the first error correction code is added; For the second data group consisting of identification information for identifying the data type of the delivered information, an error detection code for detecting an error in the identification information, and the prefix of the block, the first error correction code and When receiving a FM signal in which a different second error correction code is generated and the delivered information to which the second error correction code is added is multiplexed,
A second error correction processing step of performing error correction processing on the second data group using the second error correction code when the FM signal is received;
An input step of inputting a signal for outputting the delivery target information to the input means;
When the signal is input to the input means by the input step, an error correction process using the first error correction code and a second error correction code by the second error correction processing step is performed. A broadcast signal receiving method comprising: a first error correction processing step of performing error correction processing on a first data group of the data made .

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