JPS6397056A - Facsimile broadcasting picture receiver - Google Patents

Abstract

PURPOSE:To measure the reception status of electromagnetic wave receiving from a broadcasting satellite quantitatively by subjecting a received picture data of transmitted facsimile signals to an error detection and correction processings, and counting the number of picture elements of data generated by decoding linear compression codes. CONSTITUTION:Signals through a data channel are inputted to a facsimile signal extraction part 1, accumulated in a buffer memory 2, and a CPU 4 lets an error correction circuit 3 execute the error detection and correction, then the sequence proceeds to a reception selection processing. A program number is designated from a keyboard 11 and registered, then, the CPU 4 compares the program number received through the reception selection processing and that specified and registered. If the comparison results in coincidence, the CPU 4 starts the following decoding processing of image information consisting of linear compressed codes. A run length information obtained by the code decoding processing is outputted to a development circuit 5 and a picture element number counter 6. In the circuit 5, the data is developed into black-and-white picture elements, and transmitted to a thermal head 10a. In the meantime, in the counter 6, the signals are sequentially added up in order to count one-line-share of picture elements.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention extracts a facsimile signal that is time-division multiplexed and transmitted to the data channel part of an audio PCM signal of television satellite broadcasting, and performs serial/parallel conversion processing on the facsimile signal. The present invention relates to a facsimile broadcast receiving apparatus configured to be able to print the contents of a facsimile signal by performing error detection and correction processing, decoding processing, and printing processing.

Regarding television satellite broadcasting, it was already established in May 1981.
The inventors (Japan Broadcasting Corporation) have begun experimental broadcasting since May. The audio transmission method for this television satellite broadcast uses a fixed-length data transmission method based on PCM, and within this fixed-length data, data other than television audio can be superimposed on certain sections (
(hereinafter referred to as a data channel), but it has not yet been made clear what kind of service this data channel will be used for. However, recently there has been a move by the Radio Technology Council to decide on the content of services using this data channel. As one of its services,
Facsimile broadcasting is proposed.

(Prior art) Regarding facsimile communication line vA (telephone line), C
(As stipulated in JTT Recommendations T3 and T4, this communication line facsimile does not specify any code error detection on the transmission path. However, Phase B (identification and selection of required equipment) Regarding the pre-message procedure for
h LevelData Link Control
CRC16
(Cyclic Redundancy Check
16) can be used to detect code errors. However, since there is no error detection function for phase C (message transmission), it is not possible to determine where and how much the code is erroneous.

(Problem to be solved by the invention) For this reason, it is difficult to measure the code error rate using an actual line or to perform a simple overall quality test of the line, and data is transmitted in bursts during actual communication. In the case of an error, it is not possible to tell that there is an error in the data just by looking at the printed result of the contents of the facsimile signal, and there is a problem that the receiver may misunderstand the information.

(Means for Solving the Problems) The facsimile broadcast receiving apparatus of the present invention extracts facsimile signals that are time-division multiplexed and transmitted on the data channel part of the audio PCM signal of television satellite broadcasting, and serially/parallelly receives the facsimile signals. Serial/parallel conversion processing is performed in a facsimile broadcast receiving device configured to be able to print the contents of the superimposed facsimile signal on a printing device by performing conversion processing, error detection and error correction processing, decoding processing, and printing processing. a storage means for storing the processed facsimile signals; an error processing means for detecting and correcting errors in received data; a control means for controlling reception and decoding; A display/printing means for displaying or printing the nature of a reception error, an expansion means for expanding run length information obtained by decoding a one-dimensional compression code into pixels, and a number of run length information obtained by decoding one.
It decodes and prints the one-dimensional compressed code of the transmitted facsimile signal, and also displays the program number of the program selected at the time of reception, the number of reception errors, or the nature of reception errors. Or it is printed.

(Function) When receiving a facsimile signal that is time-division multiplexed and transmitted on the audio data channel of television satellite broadcasting, it performs error detection and error correction processing on the received data, and also performs one-dimensional compression encoding. By counting the number of pixels of the decoded data using the counting means, the state of reception of radio waves received from the broadcasting satellite can be easily and quantitatively measured. In addition, by checking the continuity of the transmitted packetized data, it is possible to calculate what kind of errors there are in the received information, and to display or print the results using a display/printing means. do.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of a facsimile broadcast receiving apparatus according to the present invention.

In the figure, reference numeral 1 denotes a facsimile signal extraction unit for extracting facsimile signals from the audio data channel part of television satellite broadcasting and subjecting them to serial/parallel conversion processing;
2 is a buffer 1 memory, 3 is an error detection and error correction circuit,
4 is a CPU for main control, 5 is a development circuit, 6 is a pixel number counter, 7 is a recording control section, 8 is a key signal input section, 9 is a sensor circuit section, 10 is a thermal head 10a, a pulse motor
11 is a keyboard, 12 is an LCD (display device such as a liquid crystal display device), and 13 is a power source.

Further, FIG. 2 shows the state of packet data transmitted by facsimile broadcasting using the audio data channel of television satellite broadcasting.

In the figure, ■ is the first packet of a program or page, ■
indicates a packet in the middle of a program, and ■ indicates a packet at the end of a program or page. IDP indicates whether or not it is facsimile image information.

RAD indicates information regarding the same program or page for one program or page. CIX is a continuity index that indicates packet continuity.

PPP indicates whether it is the first packet of the program, a packet in the middle of the program, or the last packet of the program. PRN is the program number, PAN is the page number, and TOM indicates whether recording is in binary mode. FTX indicates whether the format is standard or not. SOP indicates a blank signal, and CFX indicates image information.

Next, the operation of the facsimile broadcast receiving apparatus having the above configuration will be explained.

Data channel signals including facsimile signals are input to a facsimile signal extraction section 1 .

The facsimile signal extraction unit 1 extracts facsimile signals from the input data channel signals according to a predetermined algorithm, converts them from serial to parallel, and stores them in a buffer memory 2.

Data is stored in the buffer memory 2 in units of packets (272 bits), and when the storage in units of packets is completed, a signal indicating the end is output to the main control CPU 4. C.P.
When U4 receives a signal indicating the completion of data accumulation in the buffer memory 2, it outputs a command signal to start error detection and error correction processing to the error detection and error correction circuit 3 in synchronization with the timing. The error detection and error correction circuit 3 receives the command signal to start processing, reads data from the buffer memory 2, performs error detection processing, and then
If there is an error in the data, 8 bits out of 272 bits are corrected, information that the corrected data is normal is added to the beginning of the data, and the data is written again to the buffer memory 2. In this case, if 8 bits are When there is an error exceeding 8 bits, information that the data is unusable due to an error exceeding 8 bits is added to the beginning of the data and written to the buffer memory 2. In this way, error detection and error correction processing is performed. When this process is completed, a signal indicating that the process has been completed is sent to the CPU again.
Output to 4. The CPU 4, which receives a signal informing the end of the error detection and error correction processing, reads data from the buffer memory 2 at that timing and moves on to reception selection processing. The processing procedure for zero or more is shown in FIG. 3, Part 1.

On the other hand, the designation of the program number etc. is input by the recipient's hands from the keyboard 11, and is input to the CP via the key signal input section 8.
It is registered in the memory (not shown) under the control of U4 and displayed on the LCD 12. The CPU 4 compares the program number, etc. of the received data with the designated and registered program number, etc. by the reception selection process. As a result of the comparison, if it matches the registered program number, etc., the CPU 4
starts the decoding process of the image information consisting of the one-dimensional compressed code that follows. Run length information obtained by decoding one code is output to an expansion circuit 5 and a pixel number counter 6, respectively. The run length information input to the expansion circuit 5 is expanded into white or black pixels, and the run length information is input to the recording section 10.
is transferred to the thermal head. On the other hand, the run length information input to the pixel number counter 6 is sequentially added to count the number of pixels for one line. The process of decoding, expansion, transfer, and addition is repeated without receiving information. This process is repeated until an EOL (End of Line: code indicating the end of one line) is detected as a result of decoding the code in the CPU4. On the other hand, as shown in Figure 2, in facsimile broadcasting that is transmitted using the audio data channel of television satellite broadcasting, CIX (continuity index), which indicates packet continuity, is placed in the PFX section at the beginning of the packet. Since CIX is a rotating number from 0 to 15 (BCD) for each packet, the continuity of the packet can be determined by comparing the packet received immediately before with all received packets. be able to.

This determines whether a packet is missing, the number of missing packets is added and stored in a RAM (not shown) under the control of the CPU 4, and the number of missing packets is displayed on the LCD 12 at the same time as the end of the page is detected. The above processing procedure is shown in FIG. 3, Part 2.

Next, when the EOL is detected in the CPU 4, the addition result of the run length information obtained by decoding up to that point is read out from the pixel number counter 6, and 1728 pixels (using the audio data channel of the television satellite broadcasting) are read out from the pixel number counter 6. (one line of facsimile broadcasting is determined to have 1728 pixels). As a result, if the number of pixels in the l line is not 1728, it is added and stored in a RAM (not shown) under the control of the CPU 4 as a line error. Furthermore, when the CPU 4 detects EOL, it not only performs line error detection processing, but also outputs a command signal to the recording control unit 7 to start recording processing, and causes the pixel data transferred to the thermal head to be recorded on recording paper. Perform recording processing. As a result of repeating the above line-by-line processing while receiving packets and decoding the one-dimensional compression code in the CPU 4, E OP (End of
Page: ] A code indicating the end of the page, EOL
The process is repeated until the EOP is detected (consecutively considered as EOP when two consecutive messages are sent). When the CPU 4 detects EOP, the number of line errors that have been added and stored up to that point is displayed on the LCD 12, and the CPU 4
Character ROM for error messages under the control of
(not shown), the rasterization circuit 5 rasterizes the data into pixel data, transfers the data to the thermal head 10a, and prints the data on the recording paper 10d. Upon completion of a series of 0 or more processes, the CPU 4 performs various initial processing, and enters a waiting state for receiving the next program or page. In addition, in this example, the line error rate is calculated from the number of line errors, and one page of facsimile broadcasting transmitted using the audio data channel of television satellite broadcasting is 2.
Figure 3, Part 3 shows the processing procedure for 0 or more that can be displayed on the LCD 12 (216 lines).In this way, the function to calculate the line error rate from the number of line errors and the continuity A test reception device that can easily and quantitatively measure the reception status of radio waves received from broadcasting satellites by printing the contents using the transmitted facsimile signal by having the function of calculating the number of packets from the index. It is also possible to use it as

Note that, instead of using a printing device that also prints the contents of the facsimile signal and prints the program number of the program selected at the time of reception, the number of reception errors, or the nature of reception errors as in the above embodiment, It is also possible to easily organize a large number of measurement results obtained by repeated measurements by outputting information such as the program number of the program, the number of reception errors, or the nature of the reception errors to an external device (for example, a printer, a personal computer, etc.) .

(Effects of the Invention) As explained above, the facsimile broadcast receiving apparatus of the present invention has a counting means that can add one line of run length information obtained by decoding a one-dimensional compression code. It is possible to easily detect whether or not there is an error in the converted pixel information, and it is possible to inform the receiver whether or not the received information is accurate.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of the facsimile broadcast receiving apparatus of the present invention, and FIG. 2 is a diagram showing the state of packet data transmitted by facsimile broadcasting using the audio data channel of television satellite broadcasting. , 3rd
The figure is a flowchart showing the processing procedure of the facsimile broadcast receiving apparatus. 1...Facsimile signal extraction unit 2...Buffer memory

Claims (1)

[Claims] 1) Extracting the facsimile signal that is time-division multiplexed and transmitted into the data channel portion of the audio PCM signal of television satellite broadcasting, and subjecting it to serial/parallel conversion processing, error detection and correction processing, decoding processing, and printing processing. In a facsimile broadcast receiving device configured to be able to print the contents of a facsimile signal superimposed on a printing device, the facsimile broadcast receiving device includes a storage device for storing facsimile signals subjected to serial/parallel conversion processing, and error detection and detection of received data. an error processing means that performs error correction; a control means that performs reception control and decoding processing; a display/printing means that displays or prints the program number of the selected program, the number of reception errors, the nature of the reception errors, etc.; It is equipped with an expansion means for expanding run-length information obtained by decoding the original compression code into pixels, and a counting means for counting the number of run-length information obtained by decoding for one line. A facsimile broadcast receiving device characterized in that it decodes and prints a one-dimensional compressed code and also displays or prints the program number of a program selected at the time of reception, the number of reception errors, or the nature of the reception errors.