JPH03218158A - Photograph receiver - Google Patents

Abstract

PURPOSE:To improve the line efficiency by providing a detection means detecting a prescribed tone signal of the same pattern as, e.g. a busy tone outputted from a communication network in the state of the line holding when no photographic picture is received and releasing the line when the signal is detected. CONSTITUTION:A detection means 5 is provided, which detects a prescribed tone signal of the same pattern as, e.g. a busy tone outputted from a communication network in the state of the line holding when no photographic picture is received and when the prescribed tone signal is detected by the detection means 5, a line 2 is released. Thus, when a sender side releases the line earlier in the communication, a signal sent from the communication network is set as the prescribed tone signal and when the sender side releases the line, the line is released according thereto and the line is used efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a photo receiving device that receives photo images transmitted via a communication network.

(Conventional technology) Among the control methods for photo transmission, there is an automatic control method.

This automatic control method performs photo transmission using the following procedure, for example.

FIG. 3 is a diagram showing a protocol in the automatic control system. As shown in this figure, in the automatic control method, the sending side
A phase signal and a white signal are sent out before transmitting the photos (picture signal). The receiving side outputs answer signals for each of the phase signal, self signal, and image signal output from the transmitting side. In this way, the automatic control method uses a rough protocol, and the device configuration can be simplified.

By the way, in the case of this automatic control method, no signal is set to notify the end of communication. For this reason, the receiving device releases the line as follows. That is, as shown in FIG. 4, after the line is held by detecting the calling signal S1, the phase signal S2a and the image signal S3a are received. Here, a no-signal portion S4a is set at the end of the image signal 33a, and this no-signal portion 34a is detected. When the no-signal portion 34a is detected and the no-signal portion 34a ends, it is assumed that the image signal 53a has ended, and a timer for counting a predetermined time T is activated.

In this state, if the phase signal S2b of the next photograph arrives before the timer times out, the operation of the timer is stopped and the image signal S3b of the next photograph is received. After receiving the image signal for one image, if the next phase signal does not arrive within the time T measured by the timer and the timer times out, it is assumed that the communication has ended and the line is released.

Here, if the time T measured by the timer is too short, communication will end even though the next photo is to be transmitted, so it is generally set to about 60 seconds with some margin in mind. If the timer T is set to 60 seconds in this way, the line will be held for at least 60 seconds after the end of receiving the image signal. Therefore, even if the transmitting device releases the line immediately after sending out the image signal, the receiving device will hold the line for 60 seconds, meaning that the line will be held uselessly for a very long time.

(Problems to be Solved by the Invention) As described above, in the conventional automatic control type photo receiving device,
The line will be released if no signal is received within a predetermined time period of about 60 seconds from the end of receiving the image signal for one image, so even after the transmitting device releases the line, there will be no connection for a while. This means that the line will be held, and the line will be held unnecessarily. This reduces line usage efficiency.

The present invention has been made in consideration of these circumstances, and its purpose is to release the line as soon as possible after the end of communication, thereby making it possible to use the line efficiently. An object of the present invention is to provide a photo receiving device.

[Structure of the Invention (Means for Solving the Problems) The present invention provides a method for transmitting a predetermined tone signal having the same pattern as, for example, a busy tone output from a communication network, while the line is in a holding state and when photographic images are not being received. A detecting means for detecting when the line is not being used is provided, and when a predetermined tone signal is detected by the detecting means, the line is released.

(Function) By taking such measures, a predetermined tone signal with the same pattern as the busy tone output from the communication network, for example, can be output when the line is in a holding state and no photographic images are being received. is detected, the line is released.

Therefore, by setting the predetermined tone signal as a signal that the communication network sends when the transmitting side releases the line first during communication, when the transmitting side releases the line, the line is released accordingly. It turns out.

(Embodiment) Hereinafter, a photo receiving device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a professional diagram showing the configuration of this photo receiving apparatus. In the figure, reference numeral 1 denotes an image signal receiving section that performs processing for receiving an image signal transmitted via a line 2 and processing for recording and outputting the received image signal as an image. Further, 3 is a telephone connected to the line 2 in parallel with the image signal receiving section 1. The image signal receiving section 1 and the telephone 3 are selectively connected to the line 2 through a relay contact 4C. Note that the relay contact 4C has a break contact connected to the telephone 3 and a make contact connected to the image signal receiving section 1, respectively. , 5 is 16
Hz detection circuit, which detects the signal transmitted via line 2 (
The incoming signal) is input through the mode switch 6, and a 16 Hz signal, that is, a calling signal, is detected from among the incoming signals. Note that the mode switch 6 is turned on and off by the operator of the device, and automatic reception is turned on and off.
This is a switch to set /OFF. And 16
When the Hz detection circuit 5 detects a 16 Hz signal, it generates a drive current for the relay 4R to drive the relay 4R. Note that the drive current generated by the 16 Hz detection circuit 5 is input to the relay 4R via the line release switch 7.

Reference numeral 8 denotes a no-signal detection section, which detects a no-signal portion provided at the rear end of the image signal received by the image signal reception section 1. The no-signal detection unit 8 outputs a start instruction signal for the timer 9 at the end of the no-signal portion. The timer 9 is activated by the activation instruction signal output from the no-signal detection section 8, measures a predetermined time T, and outputs an OFF signal for the line release switch 7 when the timer times out.

Reference numeral 10 denotes a tone signal detection section as a detection means, which detects a predetermined tone signal in the incoming signal inputted via the switch 11. When the tone signal detection section 10 detects a predetermined tone signal, it outputs a reset signal for the timer 9. Note that the switch 11 is turned on by the activation instruction signal output from the no-signal detection section 8.

Next, the operation of the photo receiving apparatus configured as above will be explained.

First, in the standby state (non-communication state), the relay contact 4C is on the break contact side (telephone 3 side). Further, the line release switch 7 is in an ON state, and the switch 11 is in an OFF state. Here, if the mode switch 6 is in the OFF state, the incoming signal is given to the telephone set 3. On the other hand, when the mode switch 6 is in the ON state and the automatic reception mode is set, the incoming signal is also input to the 16 Hz detection circuit 5.

When the mode switch 6 is in the ON state and the automatic reception mode is set, as shown in FIG.
} When the intermittent signal of 1z arrives, the 16Hz detection circuit 5 determines that the calling signal s1 has arrived when the arriving 16Hz signal is detected, for example, three times. This results in
The 16Hz detection circuit 5 detects an incoming call. 16Hz
When the detection circuit 5 detects an incoming call, it drives the relay 4R and switches the relay contact 4C to the make contact side (image signal receiving unit 1 side) (at time Tl in FIG. 2). Therefore, at this point, the line is held as shown in FIG. Thereafter, the phase signal S2 and image signal S3 sequentially transmitted via the held line 2 are input to the image signal receiving section 1, and image signal reception processing and the like are performed.

In this state, the no-signal detecting section 8 detects the no-signal portion S4 in the received signal of the image signal receiving section 1. Then, the no-signal detection unit 8 detects no-signal from the received signal (at time T2 in FIG. 2), and when the detected no-signal portion S4 ends, reception of the image signal S3 for one frame ends. It determines that this is the case, and outputs a start instruction signal to the timer 9 (at time T3 in FIG. 2).

Here, the time T measured by the timer 9 is, for example, 60 as in the conventional case.
When the timer 9 times out the measured time T, it outputs an OFF signal for the line release switch 7 and turns the line release switch 7 OFF.

Accordingly, the supply of the drive signal output from the 16Hz detection circuit 5 to the relay 4R is stopped, and the relay 4R is placed in a non-driven state. Therefore, the relay contact 4C returns to the break contact side, and the line is released.

On the other hand, when the no-signal detection section 8 determines that the reception of the image signal s3 for one image has been completed and a start-up instruction signal is output, the switch 11 is turned on by this start-up instruction signal. As a result, the incoming signal is also input to the tone signal detection section 10. The tone signal detection unit 10 detects a predetermined tone signal s5 sent from an exchange (not shown) connected via the line 2 when the transmitting side releases the line first. Here, the tone signal S5 detected by the tone signal detection unit 10 is, for example, a signal having the same pattern as the busy tone, and is, for example, an intermittent signal of 400 Hz (sent for 0.5 seconds, interrupted for 0.5 seconds). It is. And tone signal detection section 10
When this 400 Hz signal is detected for 0.5 seconds and then interrupted for 0.5 seconds, for example, five times, it determines that a predetermined tone signal has arrived, and outputs a reset signal for the timer 9. This causes the timer 9 to turn off the line release switch 7.
A signal is output and the line release switch 7 is turned off.

Accordingly, the supply of the drive signal output from the 16Hz detection circuit 5 to the relay 4R is stopped, and the relay 4R is placed in a non-driven state. Therefore, the relay contact 4C returns to the break contact side and the line is released (at time T4 in Figure 2).
.

As described above, according to this embodiment, when the transmitting side releases the line first after receiving the image signal for one image, a predetermined tone signal (busy tone) is sent from the exchanger (not shown). A tone signal having the same pattern as that of a tone signal) is detected, and if a predetermined tone signal is detected, the line is released. That is, line release on the transmitting side is monitored by detecting a predetermined tone signal, and when the transmitting side releases the line, the line is immediately released. Therefore, if the sending side releases the line before the timer 9 has elapsed before the time T (for example, 60 seconds) has elapsed after the transmission of the image signal, the photo receiving device will immediately release the line without waiting for the period T. This will allow the line to be released more quickly. This reduces the line holding period and improves line efficiency.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, a 400Hz signal is sent for 0.5 seconds,
When a 0.5-second interruption is detected, for example, five times, it is determined that the transmitting side has released the line, but if the transmitting side releases the line first, a message is sent from the exchange (not shown). The form of the predetermined tone signal differs depending on the configuration of the exchanger, and the tone signal detected by the tone signal detection section 10 is determined by the configuration of the connected exchanger, and is 400Hz, transmitted for 0.5 seconds and interrupted for 0.5 seconds. is not limited to intermittent signals. In addition, various modifications can be made to the specific configuration without departing from the gist of the present invention.

[Effects of the Invention] According to the present invention, a predetermined tone signal having the same pattern as, for example, a busy tone output from a communication network is detected when the line is in a holding state and no photographic image is being received. Since the line is released when a predetermined tone signal is detected by the detection means, the line can be released as soon as possible after the communication is completed, and the line can be used efficiently. This is a photo receiving device that makes it possible to receive photos.

[Brief explanation of drawings]

1 and 2 are diagrams each explaining a photo receiving device according to an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration, and FIG. 2 is an operation timing of each part in FIG. 1. 3 and 4 are diagrams explaining the prior art, respectively. 1... Image signal receiving section, 2... Line, 3... Telephone, 4C... Relay contact, 4R... Relay 5...
16Hz detection circuit, 7... line release switch, 8...
- No signal detection section, 9... timer, 10... tone signal detection section, 11... switch.

Claims (1)

[Claims] A photo receiving device that receives a photo image transmitted via a communication network, wherein a predetermined tone signal output from the communication network is transmitted while the line is in a holding state and the photo image is not being received. What is claimed is: 1. A photo receiving device comprising: detecting means for detecting when a tone signal is not being used; and line releasing means for releasing the line when a predetermined tone signal is detected by the detecting means.