JPS62285562A - Control signal detecting method - Google Patents

Abstract

PURPOSE:To prevent the misdetection of a start control signal by a voice or the like from a telephone set by detecting a start signal again when a facsimile main body and a telephone line are connected. CONSTITUTION:When the start signal is sent from an opposite party via a terminal 3 or if a noise corresponding to the start signal is invaded from a telephone set 4, a 1st control signal detection section 5 discriminates it as 'the start signal is detected', connects the facsimile main body 1 to a telephone line to attain the facsimile communication enable state. On the other hand, a 2nd control signal detection section 6 detects whether the start signal is fed from the opposite party or not. If the detected start signal is not a normal start signal and ' the start signal is detected' is discriminated due to the noise corresponding to the start signal invaded from the telephone set 4, then the line is disconnected from the facsimile main body 1 and connected switchingly again to the telephone set 4 to bring the mode into the communication enable state. Thus, no hindrance to talking is caused.

Description

3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a control signal detection method applied to a facsimile machine activated by a facsimile activation signal during a call.

2. Description of the Related Art Such a conventional control signal detection method is applied, for example, to a facsimile machine as shown in FIG. In the figure, 1 is the main body of the facsimile.

A facsimile main body 1 is connected to a line switching section 2. The line switching unit 2 is connected to a telephone line via a terminal 3,
Under the control of the facsimile main body 1, this telephone line is switched and connected to the facsimile main body 1 or the telephone set 4. This device also includes a first control signal detection section 5 that detects a control signal when the telephone line and the telephone set 4 are connected, and a first control signal detection section 5 that detects the control signal when the telephone line and the facsimile main body 1 are connected. A second control signal detection section 6 is provided.

An example of a conventional control signal detection method in a facsimile machine configured as described above will be described with reference to the flowchart of FIG.

Normally, the line switching unit 2 is in a state where the telephone line and the telephone set 4 are connected! ll (step (hereinafter referred to as ST) 1), the telephone 4 can be used to make a call. In this state, the first control signal detection unit 5 receives the facsimile activation signal (
A detection process is performed to determine whether an activation signal (hereinafter referred to as an activation signal) has been input. (Sr2). The operation then proceeds to Sr1, where a determination is made regarding the detection processing result.
If 8T3 determines “no detection”, the operation is STI
Give feedback.

When it is determined that Sr1 is "detected," the first control signal detection section 5 controls the line switching section 2 via the facsimile main body 1 to disconnect the telephone line and the telephone set 4, and disconnects the telephone line from the facsimile main body. 1 (Sr1). Then, it becomes possible to perform facsimile communication.

Although not shown in FIG. 5, when the telephone line and the facsimile main body 1 are connected as described above, the second control signal detection section 6 detects a control signal for controlling the communication procedure of the facsimile. Then, facsimile communication is performed according to a predetermined procedure.

Problems to be Solved by the Invention However, according to such a control signal detection device,
Even though the other party's device does not actually transmit the control signal to start the facsimile, it determines that it has detected the start signal due to the noise coming in from the handset, etc., switches to facsimile communication, and then starts the communication procedure. There was a problem in that calls could not be made until some kind of abnormality was detected.

This problem arises for the following reasons. In other words, noise such as voice from the telephone is mixed in on the telephone line where the activation signal is being detected, and this misjudgment is due to the fact that the noise is mistakenly judged to be a control signal for activation. Controls the line switching means to disconnect the telephone from the telephone line and connect the facsimile body to the telephone line to switch to facsimile communication, while facsimile communication is when the telephone line is connected to the telephone and communication is possible again. This is because the 7-axis IJ communication termination condition is satisfied due to an abnormality in the procedure or the like.

As a countermeasure to this problem, a method can be considered to provide a dedicated circuit between the telephone and the telephone line, which removes the frequency component of the facsimile activation signal from noise such as the voice of the local telephone. However, this method did not provide an appropriate solution because it degraded the sound during a call and required a dedicated circuit, making the device complicated and expensive.

The present invention has been made in view of the above-mentioned problems, and the present invention has been made in a facsimile machine that receives an activation signal during a call, without using a dedicated circuit for solving the problem. An object of the present invention is to provide a control signal detection method that makes it possible to prevent this.

Means for Solving the Problems In order to achieve the above object, the present invention provides a line switching means for switching and connecting a telephone and a facsimile main body to a telephone line, and a state in which the telephone line and the telephone are connected. The apparatus includes control signal detection means for detecting a facsimile activation signal during a call and when the telephone line and the facsimile main body are connected.

When a facsimile activation signal is detected in the state where communication is possible, the control signal detection means operates the line switching means to cut off the connection between the telephone set and the telephone line, and connects the telephone line and the facsimile main unit to become ready for facsimile communication. do. In this way, the control signal detection means detects whether or not a facsimile activation signal is being input with the telephone set and telephone line disconnected. The connection state is maintained.

On the other hand, if it is detected that the same signal is not input,
Disconnect the fax machine from the telephone line.

When you release the phone, the phone and phone line are reconnected and you can make a call again.

Embodiment The control signal detection method of the present invention uses, for example, the factors shown in FIG. Applies to remote equipment. The configuration of the facsimile machine shown in FIG. 2 is as described above. In this embodiment, the first control signal detection section 5 and the second control signal detection section 6 constitute a control signal detection means. A control signal detection method according to an embodiment of the present invention in this facsimile machine will be described with reference to the flowchart of FIG.

Normally, the line switching unit 2 is in a state where the telephone line and the telephone set 4 are connected (step (hereinafter referred to as ST) 11), so that the telephone set 4 can be used to make a call. In this state, the first control signal detection section 5 performs a process of detecting whether a facsimile activation signal (hereinafter referred to as activation signal) has been input (ST12). And the operation is 5T1
The process advances to step 3, where a determination is made regarding the detection processing result.

No activation signal is being sent from the other party via terminal 3,
In addition, if the activation signal or the noise equivalent to the activation signal is not input to the first control signal detection unit 5, such as when the telephone 4 does not generate noise equivalent to this activation signal, the first control signal is detected. In section 5, “start signal not detected”
Therefore, the operation returns to STI, and the processing from STI is repeated.

On the other hand, if an activation signal is sent from the other party via the terminal 3, or if noise corresponding to the activation signal is mixed in from the telephone 4, the first control signal detection unit 5 detects the “activation signal detected” signal. ”, activates the line switching unit 2, disconnects the telephone 4 from the telephone line, and disconnects the facsimile IJ main body l.
connect to the telephone line and enable facsimile communication (5T14).

In a facsimile communication enabled state, that is, in a state in which the telephone set 4 and the telephone line are disconnected, the second control signal detection unit 6 detects whether or not an activation signal is sent from the other party (
ST15).

An activation signal is now detected (this means that the phone 4
This means that the activation signal was input from the other party's device via the line switching unit 2 and the telephone line, rather than from the telephone line. )and,"
When it is determined that the activation signal has been detected (5T16), this series of processing steps is completed and the process proceeds to facsimile communication.

On the other hand, if the 5T13 determines that the activation signal has been detected because the noise corresponding to the activation signal is mixed in from the telephone 4 instead of the regular activation signal, it is detected that the activation signal is not a regular activation signal. The same process (ST14.5T15.5T16) as in the case where it is determined as `` is performed. However, since the noise mixed in from the telephone 4 has been cut off when 5T16 makes a decision, it is determined that "no activation signal has been detected" and the operation returns to 5T11. It is disconnected, and then switched and connected to the telephone 4 again to return to a communicable state.

In addition, for the purpose of simplifying the explanation, the 7-axis IJ device to which this embodiment is applied has a case in which the control signal detection means is composed of a first control signal detection section 5 and a second control signal detection section 6. is used as an example, but it is not necessarily limited to this. For example, as shown in FIG. 3, a control signal detection means is provided between the terminal 3 and the facsimile main body 1, and this control signal detection means detects when the telephone line and the telephone set 4 are connected and when the telephone line is connected to the telephone line. The activation signal may be detected in a state where the facsimile main body 1 and the facsimile main body 1 are connected. Further, as shown in FIG. 4, it is provided with one control signal detection section 31 and a switching section 32 that always connects the control signal detection section 31 to the smeared communication line that is switched in conjunction with the switching of the line switching section 2. Alternatively, the control signal detection section 31 may always detect signals on the line.

Effects of the Invention As is clear from the above explanation, the present invention detects a control signal for starting a facsimile during a call state in which a telephone line is connected to a telephone set via a line switching means, and detects a control signal for starting a facsimile. If this is the case, do not take this as a final decision, but use the line switching means to temporarily disconnect the telephone from the telephone line.
The activation signal is detected again when the facsimile machine is connected to the telephone line, so the configuration is simple, and the reliability of signal detection can be improved by blocking noise such as voices from the telephone. As a result, signal detection can be performed in an extremely short period of time, and if it is determined that no control signal is detected, the telephone line and telephone can be quickly connected again using the line switching means. There will be no interference with calls.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing a control signal detection method according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a control signal detection method according to an embodiment of the present invention and a conventional example, and a flow chart showing a control signal detection method according to an embodiment of the present invention. Block diagram showing another facsimile machine, No. 5
The figure is a flowchart showing an example of a conventional control signal detection method. 1...Facsimile body, 2...Line switching unit, 4...
... telephone, 5 ... first control signal detection section, 6 ... second control signal detection section, 20.31 ... control signal detection section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure jI! 4I! ! ! l No. 5 Qff to Fig. 2 Simiri υ

Claims (1)

[Claims] A control signal detection means detects a facsimile recording signal during a call in which the telephone line and the telephone are connected via a line switching means that switches and connects the telephone and the facsimile body to the telephone line. , upon detection of a facsimile activation signal, controlling the line switching means to switch the telephone line to the facsimile main body side;
The control signal detection method is characterized in that the control signal detection means then detects the facsimile activation signal inputted from the telephone line again.