JPH05110736A - Facsimile broadcast receiver - Google Patents

Abstract

PURPOSE:To provide the facsimile broadcast receiver in which a facsimile broadcast desired of reception is hardly failed to receive by allowing a user to select the capacity of an expansion memory and to extend the memory depending on the performance of an externally provided facsimile equipment to be connected and on the frequency of occurrence of reception. CONSTITUTION:An expansion memory 2 storing picture data is extended in the facsimile broadcast receiver 1 in which an externally provided facsimile equipment 3 prints out picture data of the received facsimile broadcast to absorb the difference between a data transmission speed of the facsimile broadcast and a print speed of the externally provided facsimile equipment 3 thereby receiving the facsimile broadcast stably and printing out the data independently of the model of the externally provided facsimile equipment 3, and when the facsimile broadcast and the facsimile signal from a telephone line arrive at the same time, the data of the facsimile broadcast are stored tentatively in the expansion memory 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a facsimile broadcast for receiving a facsimile broadcast in which a facsimile channel with a second subcarrier is provided in the audio frequency band of a television broadcast radio wave and a facsimile signal is multiplexed with a voice signal for transmission. Receiving device

[0002]

2. Description of the Related Art In recent years, this type of facsimile broadcasting has been put into practical use.

FIG. 4 is an explanatory diagram of a spectrum of an audio frequency band in this facsimile broadcasting. In addition to the main audio channel and the sub audio channel, a facsimile channel using a second sub carrier is provided.

FIG. 5 is an explanatory diagram of the structure of one frame which is one transmission unit of this facsimile signal.

In FIG. 5, the data portion of one packet is
It is composed of digital data of 272 bits, a 16-bit mode control (MC) code is added to the head of this data portion, and one packet is composed of 288 bits. The MC code is composed of information bits b1 to b5 and check code bits b6 to b16. Further, a frame is composed of 32 packets, and a 16-bit frame synchronization signal (FC) is added to the beginning of the frame.

In the facsimile broadcast receiving apparatus 1 which receives the facsimile broadcast of such a transmission mode, first, the timing of the frame synchronization signal indicating the beginning of the data of one frame is surely detected, and the synchronization with the transmission side is established. The received frame synchronization signal is reproduced to perform the program reception processing.

FIG. 6 is an explanatory diagram of the data transmission order for one page.

The facsimile signal is basically composed of a control signal and an image signal, and the control signal is the same as a 6-frame network signal or blank signal.
It is composed of a frame program selection signal and a page end signal or program end signal of three or more packets.

Here, the network signal is a signal for transmitting operational data between broadcasting stations related to the network, and the blank signal is for ensuring an operation time such as cutting of recording paper after print output (image reception). Is a signal to be inserted into. The program selection signal is a signal for transmitting information related to program selection on the receiver side, for example, the program number and page number, and the page end signal is a signal indicating the end of the image signal for one page. The program end signal is a signal indicating the end of the image signal of the last page of the program.

In a facsimile broadcast receiving apparatus for receiving such a facsimile signal, the program numbers and page programs of a plurality of programs desired to be printed out are input to the receiving apparatus in advance and registered in the reservation memory of the receiving apparatus. In the actual receiving operation, the program number and page program included in the program selection signal of the transmitted facsimile signal are collated with the program number and page number which are input in advance and registered in the reserved memory, When the two coincide with each other, the external facsimile is started up as if a facsimile was sent from the telephone line, an image signal is transmitted to the external facsimile, and print output (image reception) is started to perform recording. Recording is ended and the recording paper is cut by receiving the page end signal or the program end signal.

[0011]

However, in such a facsimile broadcast receiving apparatus, since the external facsimile is started up after it is judged that the reserved program is received, the external facsimile receives the image data. Until then, the received image signal must be stored, and the broadcasting speed of facsimile broadcasting is about 9
760 bps and maximum transmission speed of telephone facsimile 96
Since it is slightly faster than 00 bps, it is necessary to have a memory for the speed difference. In addition, when a facsimile and a facsimile broadcast are simultaneously sent from the telephone line, there is a problem that either one cannot be received.

The present invention has been made in view of the above-mentioned points, and the present invention is made in accordance with the performance of an external facsimile to be connected.
It is another object of the present invention to provide a facsimile broadcast receiving apparatus in which the user selects the capacity of the expansion memory according to the reception frequency and expands the capacity so that the facsimile broadcast to be received is less likely to be missed.

[0013]

According to the present invention, in order to achieve the above-mentioned object, a demodulation means for demodulating a facsimile signal, a signal processing means for receiving a demodulated facsimile signal, and one frame worth of data. A reception buffer memory capable of storing image data, an error correction circuit for performing error correction of received data, a corrected data memory for storing data corrected by the error correction circuit, and an image data after error correction are sequentially provided externally. A transfer buffer for transferring to a facsimile, an external facsimile connecting means for externally connecting a telephone facsimile as a recording device, a line switching means for switching a signal for connecting to the external facsimile between a telephone line and a facsimile broadcast, The signal processing means sends the extracted image signal to an external facsimile and prints out pixel data. In a facsimile broadcast receiving apparatus provided with a recording means, an expansion memory adding means for adding an expansion memory capable of storing more corrected data, and an expansion memory capacity judging means for automatically judging the capacity of the added expansion memory Data storage means is provided for storing the corrected data in the transfer buffer and the extension memory when the extension memory is not added.

[0014]

According to the above structure, the user selects the capacity of the expansion memory according to the performance of the external facsimile to be connected and also according to the reception frequency, and increases the capacity of the expansion memory so that the facsimile broadcast to be received can be missed. Can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the facsimile broadcast receiving apparatus of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is an overall block diagram showing an embodiment of a facsimile broadcast receiving apparatus of the present invention.

In FIG. 1, reference numeral 1 is a facsimile receiver, 2 is an expansion memory which is a feature of the present invention, 3 is an external facsimile connected to the facsimile receiver 1, and 4 is a television signal in which facsimile signals are multiplexed. An antenna for receiving, 5 is a telephone line connected to an external facsimile, 6 is a demodulation section for demodulating a facsimile signal, 7 is a signal processing section, and a control signal and image including error correction processing, program number, page number, etc. A program reservation process is performed as well as a reception process such as a signal discrimination process. 8 received 1
A reception buffer for storing data for frames, 9 is an error correction circuit for performing error correction on the data stored in the reception buffer, 10 is a post-correction memory for storing data corrected by the error correction circuit 9, 11 Is a reserved memory for storing the program number, page number, etc., and 12 is the external facsimile 3 in which only image data is taken out from the corrected memory 10 in order.
A transfer buffer 13 for storing image data to be transmitted to, and a line selector switch 13 for switching a signal to be connected in an external facsimile between a telephone line and a facsimile broadcast.

The facsimile broadcast receiving apparatus 1 having such a configuration operates as follows.

When the facsimile broadcast is not received, the line changeover switch 13 is a telephone line.

When a facsimile broadcast is transmitted, the television signal in which the facsimile signal is multiplexed is received from the antenna 4, and the demodulation unit 6 demodulates the facsimile signal.

The demodulated facsimile signal is taken in by the signal processing unit 7 and written in the reception buffer 8, and the error correction circuit 9 performs error correction, and the corrected data is written in the corrected data memory 10. .. The signal processing unit 7 reads the error-corrected data, detects the program selection signal, extracts the program number and page number from the detected program selection signal, and compares them with the contents of the reservation memory 11.

As a result of the comparison, if it is a program reserved in advance, it is judged that the external facsimile 3 does not receive the facsimile from the telephone line, and the line change switch 13
Switch to the facsimile broadcasting side and install external facsimile 3
And the image signal is extracted and stored in the transfer buffer 12.

On the other hand, as soon as the external facsimile 3 is ready to print, the image data stored in the transfer buffer 12 is sequentially transmitted in accordance with the data reception speed of the external facsimile 3.

Here, since the data reception speed of the external facsimile 3 is slower than the data transmission speed of the facsimile broadcast, the data accumulates in the transfer buffer 12 with time. If the expansion memory 2 is not added and the transfer buffer 12 is full of data, the facsimile broadcast data received thereafter cannot be stored in the transfer buffer 12 and is not printed out. Further, when the reserved facsimile broadcast is received and the facsimile is being received from the telephone line, since the image data cannot be transmitted to the external facsimile 3, all the received image data is stored in the transfer buffer 12 and the transfer buffer 12 Will soon be filled with data.

However, if the extension memory 2 is added, the capacity of the extension memory 2 can be automatically judged even when the transfer buffer 12 is full, and the data can be saved in the extension memory 2 sequentially. Before the expansion memory 2 is added, the program data of the facsimile broadcast, which had been removed, can be printed out.

In order to perform the above-mentioned operation, the facsimile broadcast receiving apparatus 1 automatically determines the expansion memory expansion means for expanding the expansion memory capable of storing more corrected data and the capacity of the expanded expansion memory. Expansion memory capacity determining means and data storage means for storing corrected data in the transfer buffer and the expansion memory when the expansion memory is not added. ..

Next, the operation of the facsimile broadcast receiving apparatus 1 having the above configuration will be described with reference to FIGS.

FIG. 2 is a flowchart of the program receiving process.

At the time of start-up, a program reception waiting state is set.

When the reception of the facsimile broadcast is started, the process shifts to the process of FIG.

In FIG. 2, in step n1, a program selection signal is detected from the received facsimile signal, and the process proceeds to step n2. In step n2, the program number and page number are extracted from the detected program selection signal. Then, in step n3, the program number and page number extracted from the program selection signal are compared with the contents of the reservation memory 11, and the process proceeds to step n4. In step n4, it is judged whether the reservation is made and the reservation is made. If it is determined that the image signal is not present, the process is terminated and the image signal is not captured.

If it is determined in step n4 that the reservation is made, the process proceeds to step n5. In step n5, it is determined whether or not the external facsimile 3 is printing a telephone facsimile. In step n6, the line selector switch 13 is switched so as to connect the external facsimile to the facsimile broadcasting side. In step n7, the external facsimile 3 is started up in accordance with the facsimile protocol procedure. Moving to n8, at step n8, the error-corrected pixel data is stored in the transfer buffer 12 and then moves to step n9.

In step n9, it is judged whether or not the transfer buffer 12 is full. If it is judged that the transfer buffer 12 is not full, the process proceeds to step n10 and step n10.
Then, it is determined whether or not the end signal is detected, and when it is determined that the end signal is not detected, the process returns to step n8 to continue capturing the image data. When it is determined in step n10 that the end signal has been received, the process ends.

At step n9, the transfer buffer 12
When it is determined that the memory is full, the process proceeds to step n11, and it is determined whether the expansion memory 2 is added. When it is determined that the expansion memory 2 is added, the image data is stored in the expansion memory 2 and the process proceeds to step n13. Step n13
Then, it is determined whether or not the expansion memory 2 is full, and when it is determined that the extension memory 2 is not full, the process proceeds to step n14. In step n14, it is determined whether or not an end signal is detected. If not, the process returns to step n12 and the image data is returned. Continue to capture.

When it is determined in step n14 that the end signal has been received, the process ends. Step n
When it is determined in 13 that the expansion memory 2 is full, the process proceeds to step n15 to stop the capture of the image data and terminate the process. If it is determined in step n11 that the expansion memory 2 has not been added, the process proceeds to step n15, in which image data acquisition is stopped,
Stop processing.

When it is determined in step n5 that the telephone facsimile is being printed, the process proceeds to step n8 without performing steps n6 and n7, and the acquisition of image data is started.

FIG. 3 is a flow chart of the image data transfer processing to the external facsimile machine 3.

In FIG. 3, in step n20,
When it is determined that the external facsimile 3 is printing, when it is determined that the external facsimile 3 is printing, the process proceeds to step n21. At step n21, after waiting for the external facsimile 3 to finish printing, the process proceeds to step n22 and then to step n22. In n22, the line changeover switch 13 is switched so as to connect the external facsimile to the facsimile broadcasting side, and the process proceeds to step n23. In step n23, the external facsimile 3 is started up in accordance with the facsimile protocol procedure.
Go to step 24. When it is determined in step n20 that the external facsimile 3 is not printing, the process proceeds to step n24.

In step n24, the process waits until the external facsimile device receives the image data, and the process proceeds to step n25. In step n25, step n2
The image data is transferred to the external facsimile machine 3 until it is determined in step 6 that the image data has ended, and the process proceeds to step n27.
At step n27, the line selector switch 13 is switched so as to connect the external facsimile 3 to the telephone line side, and the process is terminated.

In the above description, as a preferred example of the present invention, the facsimile broadcast receiving apparatus which multiplexes and transmits to the television radio wave of the terrestrial broadcasting has been described. It can also be applied to facsimile broadcasting and multi-destination facsimiles that are multiplexed with the radio waves of communication satellites for transmission.

[0041]

Since the facsimile broadcast receiving apparatus of the present invention has the above-mentioned configuration, the user selects the capacity of the extended memory according to the performance of the external facsimile to be connected and the receiving frequency. As a result of the addition, it is possible to reduce the possibility that the desired facsimile broadcast will be missed.

[Brief description of drawings]

FIG. 1 is an overall block diagram showing an embodiment of a facsimile broadcast receiving apparatus of the present invention.

FIG. 2 is a flowchart showing a program reception processing operation of the facsimile broadcast receiving apparatus of the present invention.

FIG. 3 is a flowchart showing an image data transfer processing operation to an external facsimile of the facsimile broadcast receiving apparatus of the present invention.

FIG. 4 is an explanatory diagram of an audio frequency band of recent facsimile broadcasting.

FIG. 5 is an explanatory diagram of a configuration of one frame of recent facsimile broadcasting.

FIG. 6 is an explanatory diagram of a data transmission order for one page of recent facsimile broadcasting.

[Explanation of symbols]

 2 Extended memory 3 External memory 6 Demodulation section 7 Signal processing section 8 Reception buffer 9 Error correction circuit 10 Corrected data memory 11 Reserved memory 12 Transfer buffer 13 Line selector switch

Claims (1)

[Claims] 1. A demodulation means for demodulating a facsimile signal, a signal processing means for receiving the demodulated facsimile signal, a reception buffer memory capable of storing one frame of image data, and an error correction for the received data. An error correction circuit to be performed, a corrected data memory for storing the data corrected by the error correction circuit, a transfer buffer for sequentially transferring the image data after the error correction to an external facsimile, and a telephone facsimile as a recording device. External facsimile connection means connected to the outside, line switching means for switching the signal connected to the external facsimile between a telephone line and a facsimile broadcast, and the signal processing means for sending the extracted image signal to the external facsimile, In a facsimile broadcast receiving apparatus provided with a recording means for printing out pixel data Expansion memory expansion means that can expand the expansion memory that can store more corrected data, expansion memory capacity determination means that automatically determines the capacity of the expanded expansion memory, and when the expansion memory is not expanded, When expansion memory is added to the transfer buffer, the transfer buffer and the expansion memory are provided with data storage means for storing the corrected data. By adding the expansion memory, the data transmission speed of the facsimile broadcast and the external facsimile It absorbs the difference in the printing speed and can receive and print the facsimile broadcast stably regardless of the model of the external facsimile, and when the facsimile broadcast and the facsimile from the telephone line arrive at the same time, the data of the facsimile broadcast is sent. A feature that can be temporarily saved in the expanded memory Kushimiri broadcast receiver.