JPH0654937B2 - Facsimile broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention extracts a facsimile signal which is time-division multiplexed and transmitted in a data channel portion of a voice PCM signal of a television satellite broadcast, and performs a serial-to-parallel conversion process. The present invention relates to a facsimile broadcast image receiving device configured to print a facsimile signal on a printing device by performing error processing, decoding processing, and printing processing.

About television hygiene broadcasting,
Experimental broadcasting has been started by the hands of the Japan Broadcasting Corporation (NHK) from the month. The fixed length data transmission method by PCM is used for the transmission method of the sound of this television hygiene broadcasting, and a section in which the data other than the television sound can be superimposed on a certain section of this fixed length data (hereinafter There is a data channel), but it is not yet clear what kind of service this data channel will be used for. However, only recently have there been movements by the Radio Technology Council to decide the service content using this data channel. Facsimile broadcasting has been proposed as one of the services.

<Outline of the Invention> In the present invention, particularly, a facsimile signal to be transmitted is subjected to a reception process while being switched by using three sets of buffer memories, and a small capacity memory can receive a facsimile broadcast.

<Prior Art> The transmission procedure of a facsimile of a communication line (telephone line) is as specified in CCITT Recommendations T3 and T4, and one line of image information is included in Phase C (message transmission). It is stipulated that fill bits are added and transmitted when the time for transmitting one-dimensionally compressed and encoded data is less than the minimum recording scan time for one line.

On the other hand, in facsimile broadcasting, when the time for transmitting the data obtained by one-dimensionally compressing and encoding one-line image information is less than the predetermined minimum recording scan time for one line, the transmission timing of the next data bucket is set. It is prescribed to delay. Therefore, in the facsimile broadcasting, if the time for transmitting the data obtained by one-dimensionally compressing and encoding one-line image information is less than the predetermined minimum recording scan time for one line, the facsimile broadcasting is transmitted for a certain period of time. The road is completely unused. If the transmission line is to be used more efficiently, this time (the time for transmitting the data obtained by one-dimensionally compressing and encoding one line of image information is less than the predetermined minimum recording scan time for one line). In this case, it is conceivable to transmit, for example, program index information of a facsimile broadcast or a program of another facsimile broadcast during a time when the transmission line of the facsimile broadcast is not used at all.

<Problems to be Solved by the Invention> However, in the conventional facsimile broadcast image receiving and setting, a series of processes such as a reception control process and a decoding process of a one-dimensional compression code is performed using one control means, and a buffer memory is used. Since two sets are alternately switched and received, when other information that does not require image receiving processing (for example, program index information of a facsimile broadcast or another facsimile broadcast program) is transmitted, that information is If the information of the program that should be originally subjected to the image receiving process is transmitted while determining whether it is necessary or unnecessary, both buffer memories are in use and the image receiving process should be performed originally. Since there is no memory to store unacceptable facsimile signals, it will fail to be received. Therefore, if the transmission time of the data obtained by one-dimensionally compressing and encoding one-line image information is less than the minimum recording scan time of one line, the transmission line of the facsimile broadcast is not used at all. When a service that transmits other information (for example, program index information of a facsimile broadcast or a program of another facsimile broadcast) is considered, the facsimile broadcast receiver stores most of the transmitted facsimile broadcast signals. It must have a large amount of memory that can be kept.

<Means for Solving Problems> In view of the problems as described above, the present invention includes three sets of buffer memories capable of storing only one packet of incoming facsimile signals in packet units. In addition, the switching control of the three sets of the buffer memory for each process, the reception control means for extracting only necessary information from the incoming facsimile signal, and the decoding process of the one-dimensional compression code in the facsimile signal are performed. And the decoding control means of 1.

<Operation> Therefore, in this case, in order to efficiently use the transmission line of the facsimile broadcast by having a function of determining whether the signal of the incoming facsimile broadcast is necessary or not regardless of the image receiving processing speed, If the time for transmitting the data obtained by one-dimensionally compressing the line image information and encoding the data is less than the predetermined minimum recording scan time for one line, the transmission time for the facsimile broadcast is not used at all. Even when information (for example, program index information of a facsimile broadcast or another facsimile broadcast program) is transmitted, the facsimile broadcast can be received by the small capacity memory.

<Example> The present invention will be described in detail below with reference to an example shown in the drawings.

FIG. 1 is a block diagram of a facsimile broadcast image receiving apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a facsimile signal extracting portion for extracting a facsimile signal from a data channel portion of a voice of a television satellite broadcast and performing parallel-to-parallel conversion processing. Reference numeral 2 is a facsimile signal output from the facsimile signal extracting portion 1. Of the three buffer memories 3, 4 and 5 for selecting which buffer memory to store, 6 is an error processing unit for performing error detection and error correction processing of the received facsimile signal, and 7 is 3 Switching control for each processing of the set of buffer memories 3, 4, and 5 and a reception control unit for extracting only a facsimile signal that needs image receiving processing from the received facsimile signals, 8 is a desired program number, etc. The operation unit 9 for selecting, the error processing unit 6 and the reception control unit 7 select which buffer of the buffer memories 3, 4, and 5. A memory selector 10 for selecting whether to process the facsimile signal stored in the memory is selected by the decoding control unit 13 from which buffer memory among the buffer memories 3, 4 and 5 the decoding process is performed. A memory selector 11, a decompression circuit for decompressing the run-length information obtained by decoding the one-dimensional compression code by the decoding control unit 13 into pixel information, and 12 recording the pixel data expanded by the decompression circuit 11 on a recording sheet. Recording unit for, 1
Reference numeral 3 is a decoding control unit for reading a facsimile signal from the buffer memories 3, 4, 5 selected by the memory selector 10 and decoding the one-dimensional compression code to convert it into run length information.

Further, FIG. 2 shows a state of transmitted packets of a facsimile broadcast transmitted by using a voice data channel of a television satellite broadcast.

In the figure, the first packet of the program or page transmitted in the basic mode, is the packet in the middle of the program transmitted in the basic mode, is the last packet of the program or page transmitted in the basic mode Indicates.
Occurs in a facsimile broadcasting program being transmitted in the basic mode, in which the time for transmitting the data obtained by one-dimensionally compressing and encoding one-line image information is less than the specified minimum recording scan time for one line. However, it indicates that a packet in the middle of another program or page of another facsimile broadcast is being transmitted while the transmission timing of the next packet is delayed. IDP indicates whether or not the image information is a facsimile image information. RAD indicates that it is information about the same program or page for one program or page. CI
X is a continuity index indicating the continuity of packets. PRP
Indicates whether it is the first packet of the program, the packet in the middle of the program, or the last packet of the program. PRN indicates the program number, PAN indicates the page number, and TOM indicates whether the recording is in the binary mode. FTX indicates whether the format is standard. SOP is a blank signal, C
FX indicates image information. Further, another facsimile broadcast program transmitted during the transmission delay period of the facsimile broadcast program being transmitted in the basic mode has a different RAD (relative address) value from the facsimile broadcast program being transmitted in the basic mode. ing.

Next, the operation of the facsimile broadcast image receiving apparatus having the above-mentioned configuration will be described.

Each unit of the facsimile broadcast image receiving apparatus configured as described above performs various initialization operations after the power is turned on. After performing various initial settings, the reception control unit 7 instructs the memory selector 2 to store the facsimile signal output from the facsimile signal extracting unit 1 in the buffer memory 3. After performing various initial settings, the decoding control unit 13 waits until a decoding start command is given from the decoding control unit 7.

When the above initialization operation is completed, the facsimile signal extracting unit 1 waits for transmission of a data channel signal including a facsimile signal. Data channel signals including a facsimile signal are given to the facsimile signal extracting unit 1. The signal of the data channel given to the facsimile signal extracting unit 1 is extracted from the facsimile signal according to a predetermined algorithm, serial-to-parallel converted, and input to the memory selector 2. The facsimile signal input to the memory selector 2 is input to and accumulated in the buffer memory 3 according to a command from the decoding control unit 7 in the initializing operation. The buffer memory stores the data in packet units (272 bits). When the accumulation of packet-unit facsimile signals is completed, the reception controller 7
Let us know. Reception control unit 7 informed of the end of storage of facsimile signals in packet units in the buffer memory 3.
Instructs the memory selector 2 so that the memory for accumulating the next transmitted packet-unit facsimile signal becomes the buffer memory 4. Then, the reception control unit 7 instructs the memory selector 9 to select the buffer memory 3 in order to perform error detection and error correction of the facsimile signal of the packet unit accumulated in the buffer memory, and also causes the error processing unit 6 to make an error. Issue a command to start processing. The error processing unit 6 receives a command to start error processing, reads a packet-based facsimile signal through the memory selector 9 selected in the buffer memory 3 according to a command from the reception control unit 7, performs error detection processing, and then converts the data into data. If there is an error, error correction of 8 bits out of 272 bits is performed, information that the corrected data is normal is added to the beginning of the data, and the corrected data is written again in the buffer memory 3 via the memory selector 9. . If 8b
When there is an error that exceeds it, information that there is an error that exceeds 8 bits and the data is unusable is added to the beginning of the data, and the corrected data is written in the buffer memory 3. The error processing is performed as described above, and when the processing is completed, the error processing unit 6 notifies the reception control unit 7 that the error processing is completed. The reception control unit 7, which has been notified of the end of the error processing, reads the packet-based facsimile signal from the buffer memory 3 through the memory selector 9 in synchronization with the timing, and determines whether the packet-based facsimile signal reception processing is required. The process moves to the process of determining whether it is unnecessary.

The designation of the program number or the like is input by the operator from the operation unit 8 and registered in the memory under the control of the reception control unit 7. In the reception control unit 7, in the image receiving process necessity determination process, the program number of the facsimile signal in packet units stored in the buffer memory 3 via the memory selector 9 and the program number registered by designating Compare. When it matches with the registered program or the like, the reception control unit 7 commands the memory selector 10 to select the buffer memory 3, and outputs a decoding start command to the decoding control unit 13. The decoding control unit 13, which has received the decoding start command from the reception control unit 7, occupies the buffer memory 3 via the memory selector 10 that selects the buffer memory 3 according to the command from the reception control unit 7, and is an image formed of a one-dimensional compression code. Start the information decoding process. Therefore, since one set of buffer memories is occupied when the decoding control unit 13 is in the decoding process, the reception control unit 7 uses the remaining two sets of buffer memories to determine whether the receiving process and the image receiving process are necessary. I do.

On the other hand, in the previous process, the buffer memory 4 from the reception controller 7
The memory selector 2, which is instructed to select, selects the next facsimile signal in packet units from the one facsimile signal extracting unit while the reception control unit 7 is performing the error processing and the image receiving processing necessity determination processing. It is stored in the buffer memory 4. When the storage of the next facsimile signal in packet units is completed in the buffer memory 4, the reception control unit 7 is again informed that the accumulation of facsimile signals in packet unit is completed. The reception control unit 7 is informed again that the accumulation of the facsimile signal in packet units is completed.
Instructs the memory selector 2 so that the buffer memory for accumulating the next transmitted facsimile signal becomes the buffer memory 5, and selects the memory selector 9 to the buffer memory 4 in the same manner as the previous processing, and performs error processing. A decryption process necessity determination process is performed.

When it is determined that the decoding process is unnecessary as a result of performing the decoding process necessity determination process, the reception control unit 7 does nothing and the next facsimile signal in the unit of packet is stored in the buffer memory 5.
Wait until the storage is completed and perform the same processing as described above.

As described above, using three sets of buffer memories, one buffer memory is used for accumulating processing of the facsimile signal from one facsimile signal extracting section, and the other buffer memory is receiving while accumulating processing. The control unit 7 uses the error processing and the decoding processing necessity determination processing.
The reception control unit 7 manages the processing purpose of the buffer memory such that the decoding control unit occupies the remaining one buffer memory for the decoding process, and the image receiving process is performed by performing the smooth decoding process necessity determination process. Facsimile signal that requires image reception processing even if another facsimile broadcast packet that does not require image reception processing is transmitted between required packets of facsimile signals Will not fail to receive the packet.

On the other hand, the decoding control unit 13, which has received the decoding start command from the reception control unit 7 and started the decoding process, supplies the run length information obtained by the decoding process of one one-dimensional compression code to the decompression circuit 11. The expansion circuit 11 given the run length information from the decoding control unit 13 expands it into white or black pixels and transfers it to the recording unit 12.

When the decoding process of the facsimile signal for one packet is completed, the decoding control unit 13 notifies the reception control unit 7 that the decoding process of the facsimile signal for one packet is completed. Then, the decryption control unit 1
Reference numeral 3 releases the buffer memory occupied by the decoding process, and waits for the reception control unit 7 to output a decoding start command for the next facsimile signal in packet units. In this way, the image information for one line consisting of one or a plurality of packets is repeatedly decoded, expanded, and transferred, and the result of decoding the code in the decoding control unit 13 is EOL (End of Lin).
e) The process is repeated until (a code indicating the end of one line) is detected. When the EOL is detected in the decoding control unit 13, the recording unit 12 is instructed to start the recording process, and the recording process for recording on the recording paper is performed.

As a result of decoding the code in the decoding control unit 13 by repeating the above processing, EOP (End of Page) (a code indicating the end of one page, EOP when two EOLs are continuously sent The above process is repeated until the above is detected. When EOP is detected in the decoding control unit 13, the reception control unit 7 is notified that the image receiving process for one page is completed. The reception control unit 7, which has been notified by the decoding control unit 13 that the image receiving process for one page has been completed, waits for reception of the next program or page.

<Effects of the Invention> As described above, according to the present invention, three sets of buffer memories are switched for each process, and it is possible to determine whether or not the image receiving process of a transmitted facsimile signal is necessary, independently of the image receiving process. Thus, the image receiving process is delayed by the content of the transmitted facsimile signal, the buffer memory is all in use, and the facsimile signal is not missed. Therefore, in order to efficiently use the transmission line of the facsimile broadcast, depending on the content of the facsimile signal, during the period in which the transmission timing of the next facsimile signal is delayed, another facsimile broadcast program or program index information of the facsimile broadcast is transmitted. Even if the image is transmitted, the image can be manufactured at a low cost because it can be manufactured without significantly increasing the memory of the facsimile broadcast image receiving device.

The facsimile broadcast receiving apparatus according to the present invention can be applied not only to facsimile broadcasting using the data channel of the audio PCM signal of satellite broadcasting but also to terrestrial facsimile broadcasting.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is
FIG. 7 is a transmitted packet data array diagram of a facsimile broadcast transmitted by using a data channel of a voice of a television satellite broadcast. 1 ... Facsimile signal extracting unit, 2 ... Memory selector, 3,4,5 ... Buffer memory, 6 ... Error processing unit, 7 ... Reception control unit, 8 ... Operation unit, 9,10 ...
... memory selector, 11 ... expansion circuit, 12 ... recording section, 13 ... decoding control section.

Claims (1)

[Claims] Claim: What is claimed is: 1. A facsimile signal transmitted by being time-division-multiplexed is extracted from a data channel portion of a PCM signal of a television satellite broadcast, and serial-to-parallel conversion processing, error detection error correction processing, decoding processing, and printing processing are performed. By performing the application, in the facsimile broadcast image receiving device configured such that the content of the superimposed facsimile signal can be printed by the printing device, it is possible to store only one packet of the transmitted facsimile signal and the facsimile. Three sets of buffer memories 3, 4 and 5 for performing serial-to-parallel conversion processing of signals and temporarily storing data, and three sets of memory selectors for switching the three sets of buffer memories 3, 4 and 5 according to processing. Required from among 2, 9 and 10 and 3 sets of buffer memories 3, 4 and 5 for managing processing purposes and incoming facsimile signals A reception control unit 7 for extracting only information, an error processing unit 6 for performing error detection and error correction of received data, and a decoding control for performing a decoding process of a one-dimensional compression code in a facsimile signal. Part 13
It includes a decompression circuit 11 for decompressing the run-length information obtained by decoding the one-dimensional compression code into pixel information, and a recording unit 12 for recording the pixel information on a recording paper, and transmits the transmitted facsimile signal into three sets. A facsimile broadcast receiving apparatus characterized in that it is possible to perform reception processing while switching using buffer memories 3, 4, 5 and receive a facsimile broadcast with a small capacity memory.