JPH01270448A - Phototelegraphic apparatus - Google Patents

Abstract

PURPOSE:To easily locate trouble by providing a device on the reception side with a circuit which detects a break of a reception signal and a circuit which detects that photographic information is broken over a certain time. CONSTITUTION:The signal from a transmission multiplexing device 3 is sent to a digital receiver 6, where photographic information is received and recorded, through a reception multiplexing device 4 and a reception communication controller 5. With respect to circuits which detect a break of the reception signal, the multiplexing device 4 is provided with a carrier detecting circuit 42 and an inverting circuit 43 and the controller 5 is provided with an inverting circuit 52. Display devices 45 and 54 are connected to these circuits through FFs 44 and 53. The controller 5 is provided with a filter 55, an inverting circuit 56, and a timer 57 as circuits which detect that photographic information is broken over a certain time, and a display device 60 is connected through an AND circuit 58 and an FF 59. Thus, even trouble on the transmission side is discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is utilized for transmitting photographic information using a unidirectional line. In particular, it relates to a configuration in which a failure in a device on the transmitting side is detected on the receiving side. The present invention is suitable for use in a newspaper photo transmission device.

〔overview〕

The present invention is a photo transmission device that transmits photo information using a unidirectional line, and when a failure occurs, the receiving device displays a different failure display depending on the reception result, so that the receiving side can identify the location of the failure. This allows for judgment.

[Conventional example]

FIG. 8 is a block diagram of a conventional photo transmission device.

This photo transmission device is comprised of an analog transmitter 7 that transmits photo information, and a program receiver 8 that receives photo information via an analog line. When a failure occurs in the analog transmitter 7, the analog transmitter 7 itself displays the failure and becomes unable to transmit photo information. Since the analog receiver 8 continues recording the received signal in a no-signal state, the recording of the no-signal portion is lost and output. Second, the operator on the receiving side sees the lost recording results and calls the operator on the transmitting side to investigate whether or not the analog transmitter 7 indicates that a failure has occurred. If it is displayed, it is determined that there is a failure in the analog transmitter 7, and if it is not displayed, it is determined that there is a failure in the analog line.

However, this system has the drawback of increasing operational man-hours because the operator must check the recorded results on the receiving side and then make phone calls to determine the location of the failure.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a photo transmission device that allows easy identification of a location where a failure occurs.

[Means for solving problems]

In the photo transmission device of the present invention, the receiving side device includes a first detection circuit for detecting a break in the received signal, a second detection circuit for detecting that photo information has been interrupted for a certain period of time, and a first detection circuit for detecting a break in the received signal. a first fault display means for displaying a detection output; and a second fault display means for displaying that a fault has occurred in the digital transmitter when there is no detection output from the first detection circuit and there is an output from the second detection circuit. It is characterized by having

[For production]

If a failure occurs in the digital transmitter, the transmission of photo information will stop and a reception timeout will occur on the receiving side. In this case, it is determined that a failure has occurred in the digital transmitter. Additionally, when a failure occurs in other equipment, including unidirectional lines, the transmission request signal stops, and
Carrier signal stops. Therefore, the receiving side monitors the carrier signal, and when this signal cannot be detected, a failure of the own device is displayed. This makes it easy to isolate failures and reduce operational man-hours.

〔Example〕

FIG. 1 shows a block diagram of a photo transmission apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing details of a receiving side apparatus.

This embodiment device includes a digital transmitter 1 that transmits photographic information, and a transmitting side device that controls transmission from this digital transmitter 1 to a unidirectional line, that is, a transmitting communication control device 2.
and a transmission multiplexer 3, a receiving side device that controls reception from a unidirectional line, that is, a reception multiplexer 4 and a reception communication control device 5, and a digital receiver 6 that receives and records photographic information. Be prepared.

The receiving side device includes a carrier detection circuit 42 and an inverting circuit 43 in the receiving multiplexer 4 and an inverting circuit 52 in the receiving communication control device 5 as a first detection circuit for detecting a disconnection of the received signal. Further, the reception communication control device 5 includes a low-pass filter 55, an inverting circuit 56, and a timer 57 as a second detection circuit that detects that the photographic information is interrupted for a certain period of time or more.

Further, as a first failure display means for displaying the detection output of the first detection circuit, a fugutsubu flop 4 is provided in the reception multiplexer 4.
4 and a fault indicator 45, and the reception communication control device 5 is provided with a flip-flop 53 and a fault indicator 54.

Then, as a second failure display means for indicating that a failure has occurred in the digital transmitter 1 when there is no detection output from the first detection circuit and there is an output from the second detection circuit, an AND circuit is installed in the reception communication control device 5. 58, a flip-flop 59 and a fault indicator 60.

The reception multiplexer 4 further includes a demultiplexer circuit 41 that demultiplexes multiplexed received signals from the unidirectional line. A plurality of outputs of the demultiplexing circuit 41 are each sent to the reception communication control device 5. The carrier detection circuit 42 is provided corresponding to each output signal of the multiplexing/demultiplexing circuit 41, and detects the carrier signal of that signal. This carrier detection circuit 42
The output is sent to the receiving communication control device 5 together with the output of the corresponding demultiplexing circuit 41. The inversion circuit 43 is
When there is no output from the carrier detection circuit 42, a flip-flop 44 is set to cause a fault indicator 45 to indicate the occurrence of a fault.

The reception communication control device 5 includes a demodulation circuit 51, and the output of the demodulation circuit 51 is sent to the digital receiver 6. Further, the output of this demodulation circuit 51 is branched and supplied to a trigger terminal of a timer 57 via a low-pass filter 55 and an inversion circuit 5G. Therefore, timer 57 is activated when there is no demodulated signal.

When a demodulated signal cannot be obtained even after a certain period of time has passed,
The output of the timer 57 is turned on, setting the flip-flop 59 via the AND circuit 58, and causing the fault indicator 60 to display the occurrence of a fault.

Although not shown, the transmission communication control device 2 and the transmission multiplexing device 3 also have failure indications. 3 shows a state in which a failure has occurred in the unidirectional line and the reception multiplexer 4.

In the event of a failure in the digital transmitter 1, the transmission communication control device 2
stops sending photo information. As a result, the reception communication control device 5 waits to receive the photo information, and if the photo information cannot be received for one second or more, the reception timeout occurs. At this time, the receiving communication control device 5 turns on the fault indicator 60 to notify the receiving side operator that a fault has occurred in the digital transmitter 1.

Further, in the event of a failure in the transmission communication control device 2, the transmission communication control device 2 stops transmitting the transmission request signal a and displays a failure indication on its own failure indicator. Similarly, the transmission multiplexer 3 and the reception multiplexer 4 each display a failure indication and stop transmitting the transmission request signal a. At this time, the reception communication control device 5 detects the interruption of the carrier detection signal, and uses the failure indicator 60 to notify the receiving side operator of the occurrence of the failure.

Further, in the event of a line failure, the reception multiplexer 4 is notified of the line disconnection status C. As a result, the reception multiplexer 4 indicates that the line is disconnected and stops outputting the carrier detection signal. The reception communication control device 5 detects the interruption of the carrier detection signal and uses the failure indicator 60 to notify the receiving side operator of the occurrence of the failure.

〔Effect of the invention〕

As explained above, the photo transmission device of the present invention can distinguish between a fault in a digital transmitter and a fault in other devices including a unidirectional line, and can also display the occurrence of a fault in each device. can.

This has the effect of reducing operational man-hours.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a photo transmission device according to an embodiment of the present invention. FIG. 2 is a detailed block configuration diagram of the receiving side device. FIG. 3 is a diagram showing a state in which a failure occurs in a digital transmitter. FIG. 4 is a diagram showing a state in which a failure has occurred in the transmission communication control device. FIG. 5 is a diagram showing a state in which a failure has occurred in the transmission multiplexing device. FIG. 6 is a diagram showing a state in which a failure occurs in a unidirectional line. FIG. 7 is a diagram showing a state in which a failure has occurred in the reception multiplexer. FIG. 8 is a block diagram of a conventional photo transmission device. DESCRIPTION OF SYMBOLS 1... Digital transmitter, 2... Transmission communication control device, 3... Transmission multiplexing device, 4... Receiving multiplexing device,
5... Reception communication control device, 6... Digital receiver, 41... Demultiplexing circuit, 42... Carrier detection circuit, 43.52.56... Inversion circuit, 44.53.5
9... Flip-flop, 45.54.60... Fault indicator, 51... tI adjustment circuit, 55... Low pass filter, 57... Timer, 58... AND circuit.

Claims (1)

[Claims] 1. A digital transmitter (1) that transmits photographic information; a transmitting device (2, 3) that controls transmission from this digital transmitter to a unidirectional line; A receiving device (4,
5) and a digital receiver (6) that receives and records photo information, the receiving side device includes a first detection circuit (42, 43, 5) that detects a disconnection of the received signal.
2), a second detection circuit (55, 56, 57) that detects that the photographic information has been interrupted for a certain period of time or more, and a first fault display means (44, 45, 57) that displays the detection output of the first detection circuit.
53, 54), and second fault display means (58, 59, 60
) A photo transmission device comprising: