JPH0728335B2 - Telephone terminal equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone terminal device capable of making an extension call.

2. Description of the Related Art Conventionally, there is an intercom as a device often used for calling or calling in an office or home. Further, recently, a telephone terminal device has been used in which a telephone device and an intercom are combined to enable extension telephone calls in an office or a home in addition to a telephone call through a public line.

This type of device is different from the conventional system consisting of a key telephone device and a parent-child telephone device, and is different from the public line (Tip-Ri) that is often found in indoor telephone line wiring in the United States.
ng) and four lines consisting of two lines open to the user (A-A1) are skillfully used to make the above-mentioned calls for extension calls.
The wiring of A-A1 is used. When making a call, the calling device sends a control signal for simultaneous paging, that is, a continuous DC signal, and when the called device detects this, a voice signal is sent as a control signal. And the call is transmitted. Therefore, the wiring work and the structure of the device are simple and inexpensive, and the system can be used by a simple operation.

Problems to be Solved by the Invention However, unlike the key telephone device, in the system as described above, the call control of other devices is simultaneous call. This is a system in which an intercom is originally composed of a pair of a master unit and a slave unit, and when a plurality of intercoms are connected in parallel to one communication path, the call of one intercom is made to the other. This is because all the intercoms are configured to respond. Therefore, in order for a user to make an individual call using a system composed of a plurality of intercoms, it is necessary to purchase an expensive button telephone device from the beginning or to discard the system currently in use and replace it with a new device. There is a problem that not only it is very uneconomical, but also the wiring work is complicated.

The present invention has been made in view of the above-mentioned prior art, and can be used with a conventional telephone terminal device, and further, the conventional telephone terminal device can be individually called, in which case the conventional telephone terminal device is adversely affected. The present invention provides a telephone terminal device that does not affect

Means for Solving the Problems To achieve this object, the telephone terminal device of the present invention is activated by a signal from the called device designating means and is activated in accordance with the mark signal and the output signal of the called device designating means. Control signal generating means for generating control signals having called device designating signals of different lengths, control signal transmitting means for transmitting control signals to the communication path, and control signal receiving means for receiving control signals coming from the communication path When the mark signal of the control signal output from the control signal receiving means and the length of the called device designation signal portion are measured and the mark signal is longer than a predetermined length, and the called device designation signal has a predetermined length. And a detection means for outputting a coincidence signal when they are equal to.

Operation With this configuration, when a mark signal having a length longer than a specific length is transmitted, all devices respond to this and enter into a ringing state, which consists of a mark signal having a length less than a predetermined length and a space signal having a specific length. When the control signal is transmitted, only a specific device responds to this and enters the individual call state.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a main part of a telephone terminal device according to an embodiment of the present invention. In FIG. 1, 1 is a public line, 2 is an extension used as a communication path for an intercom, 3 is a line closing means for closing and opening the public line 1 and extension 2, and 4 is a transmitting / receiving circuit. , 4a is a handset composed of a transmitter and a receiver, 5 is an interface circuit for connecting the extension 2 with a control signal receiving circuit 6 and a control signal transmitting circuit 7 described later, and 6 is a call coming from the extension 2. A control signal receiving circuit for receiving a control signal such as a signal,
Reference numeral 7 is a control signal transmission circuit for transmitting control signals such as a simultaneous call signal and an individual call signal for calling another terminal device to the extension 2, and 8 is a device number setting for setting the device number of the telephone terminal device. Means, 9 is a dial button for inputting the telephone number of the other party when making a call through the public line 1 and the telephone terminal device number of the other party when making an extension call using the extension 2, and 10 is the public line 1 Line selection means for selecting any one of the extensions 2; 11 is a paging button operated when paging all terminal devices connected to the extension 2; 12 is a ringing tone or a voice in case of paging A speaker for sending out, and a control means 13 for controlling the whole of the apparatus, which is composed of a microcomputer. or
13a is a time measuring means for measuring the pulse interval of the received control signal, 13b is a first timer means capable of controlling the operation time for setting the pulse interval of the control signal to be transmitted, 13b
c is the second timer means that expires in 60 seconds, and the control means 1
It is configured inside 3. Reference numeral 14 is a dial sending means, which is composed of a switching element and is intermittently operated by a control signal. 15a and 15b are interlocking contacts and form a hook switch.

Next, the operation when a plurality of telephone terminal devices of the present invention shown in FIG. 1 are connected and used will be described. Here, the telephone terminal devices of the present invention are connected by the extension 2.

FIG. 2 is a flow chart showing an operation when calling another terminal device connected to the extension 2 from this device, and FIG. 3 is a case where this device receives a calling signal from another terminal device connected to the extension 2. 3 is a flowchart showing the operation of FIG.

FIG. 4 shows the format of the control signal when calling the terminal device connected to the extension 2.

The operation of the telephone terminal device configured as described above will be described below.

First, the case of making a call through the public line 1 will be described. When an external line (public line) is selected by the line selection means 10, this state is read by the control means 13 by applying a signal to the input terminal P1. In response to this,
The control means 13 switches the line closing means to the "a" side by outputting a control signal to the output terminal P7. When the handset of the transmitting / receiving means 4 is off-hook in this state, the contacts 15a and 15b of the hook switch are turned on and the public line 1
Is closed. When the telephone number of the other party is input from the dial button 9, the data indicating the pressed button of the dial button 9 is read into the control means 13 from the input terminal P4, and the control means 13 outputs a pulse for responding to the input dial. The signal is output from the output terminal P9, and the dial transmission means 14 is intermittently connected according to this signal and the dial signal is transmitted to the public line 1. When the other party responds, the call goes into a call state. When the call ends and the handset goes on hook, the public line 1 is released and the call ends.

Next, a case of making a call using extension 2 will be described. Before use, set the extension number of this device.
When the extension number of this device is set to, for example, "1" by the device number setting means 8, a signal indicating this state is input terminal P2.
Then, it is read and stored in the register inside the control means 13.

First, a case where another terminal device is called from this device will be described. When an extension is first selected by the line selecting means 10, a signal indicating this state is read by the control means 13 from the input terminal P1. In response to this, the control means 13 outputs the output terminal
The circuit closing means is switched to the "b" side by outputting a control signal to P7 (STEP 1). In this state, when the handset of the transmitting / receiving means 4 is off-hook (STEP2), the contacts 15a and 15b of the hook switch are turned on and the extension 2
Is closed (STEP 3). At STEP 4, the user selects whether to make an individual call or a simultaneous call. When the simultaneous call button 11 is operated, a signal indicating this state is read by the control means 13 from the input terminal P5 and the process proceeds to STEP5. When any one of the dial buttons 9 is operated to make an individual call, the process proceeds to STEP9.

At STEP 5, the control means 13 outputs a control signal to the output terminal P6 to control the control signal transmission circuit 7 to generate a continuous DC signal. This signal is sent to the extension 2 via the interface circuit 5. On the other hand, the control means 13 monitors the state of the input terminal P5 and continues to output the paging signal while the paging button 11 is pressed. here,
The device is in a paging signal transmission state in which the conventional intercom device can also be called. The user speaks the message while holding down the paging button 11. This voice is converted into an electric signal by the transmitting / receiving means 4 and sent to the extension 2. When the control means 13 detects that the call end button 11 has been released after the message is completed (STEP6), the control means 13 proceeds to STEP7, and the control means 13 outputs a control signal to the output terminal P6 to transmit a control signal. The circuit 7 is controlled to stop the sending of the general calling signal. Here, the control means 13 monitors the state of the input terminal P10 to check whether the handset is on-hook, that is, whether the contact 15b is off. If it remains off-hook, return to STEP4. If it remains on-hook, proceed to STEP17.

At STEP 9, the control means 13 sends an individual calling signal according to the input individual calling device number. As shown in FIG. 3, the individual calling signal is composed of a mark signal having a predetermined width and an identification signal that is delayed from the mark signal by a specific time, and is identified by the time when the identification signal is delayed from the mark signal. For example, the pulse width of the mark signal and the identification signal of the individual calling signal of the device number 1 is set to 1 msec, and the delay of the identification signal from the mark signal is set to 130 msec. The pulse width of the mark signal and identification signal of the individual calling signal of device number 2 is 1 m
sec, the delay from the mark signal to the identification signal is set to 146 msec. The pulse width of the mark signal and the identification signal of the individual calling signal of the device number 3 is set to 1 msec, and the delay of the identification signal from the mark signal is set to 162 msec. The pulse width of the mark signal and identification signal of the individual calling signal of device number 4 is 1 mse
c, The delay from the mark signal to the identification signal is set to 178 msec. The pulse width of the mark signal and the identification signal of the individual calling signal of the device number 5 is set to 1 msec, and the delay of the identification signal from the mark signal is set to 194 msec. The setting of these times is performed by the first timer means 13b. This signal is 5
When the handset is on-hook (contact 15b is in the off state), the control means 13 monitors the state of the input terminal P10 after repeatedly sending the data five times (STEP10). If it is off-hook, proceed to STEP 12, and if it is on-hook, proceed to STEP 15.

In STEP 12, the control means 13 activates the second timer means 13c. In STEP 13, it is checked whether the above timer has expired (60 seconds have passed). If it has expired, proceed to STEP 14, and if not, return to STEP 11.

At STEP 14, the control means 13 sends a beep sound and returns to STEP 11.

In step 15, the control means 13 sends a call stop signal. As shown in FIG. 4, the paging stop signal is a signal having a pulse width of 1 msec for the mark signal and the identification signal and a delay of 210 msec from the mark signal to the identification signal, and these times are set by the first timer means 13b. Be done. This signal is repeatedly sent 5 times, and if sent 5 times (STEP1
6) Go to STEP17.

In STEP 17, the control means 13 opens the extension 2 and enters the standby state.

Next, the operation when this device receives a call from another terminal device will be described. When the call control signal arrives from the extension 2, this signal is input to the interface circuit 5, the waveform is shaped by the control signal receiving circuit 6, and the signal is applied to the input terminal P3 of the control means 13. When this state is detected (STEP 20), the control means proceeds to STEP 21 and inspects whether the received signal is an individual calling signal or a general calling signal. The determination as to whether this is a simultaneous calling signal or an individual calling signal is performed as follows. When any detection signal is output, the control means 13 measures the pulse width by the internal posting means 13a. This pulse width is 1
If it is less than msec, it is judged as noise and removed. If the pulse width is 1 msec, it is judged as the mark signal of the individual calling signal and the process proceeds to STEP22. If the pulse width is longer than 1 msec and shorter than 4 msec, it is not considered as a mark signal and is removed. If the pulse width is continuous for 4 msec or more, it is judged as a simultaneous call signal and the process proceeds to STEP30.

In STEP22, the control means 13 measures the time of the presence section and the absence section of the received signal by the internal timing means 13a. Since the extension number of this device is set to "1", the width of each pulse signal, that is, the mark signal and the identification signal is 1 m.
sec, 130 msec between the mark signal and the identification signal, and these values are compared. If they match, the process proceeds to STEP24, and if they do not match, the process returns to the standby state (STEP20) (STEP23).

In STEP 24, the control means 13 outputs the ringing tone through the transmitting / receiving circuit 4 and the monitor speaker 12 by the output terminal P8. Then, the second timer means 13c is activated (STEP2
5) After that, detection of expiration of the above timer (STEP26), detection of call stop signal (STEP27), and monitoring of input terminal P10 status to check if the handset is off-hook (contact 15b is on) Perform (STEP28). When the expiration of the second timer means or the call stop signal is detected, the process proceeds to STEP33. If the handset remains on-hook, the process returns to STEP25. If the handset is off-hook, STEP29.
And the extension 2 is closed to enter the call state, and the input terminal P1
The state of 0 is monitored until the handset 4a is hooked on (the hook switches 15a and 15b are turned off) (STEP
34). When the on-hook is detected, the control means 13 opens the extension 2 and enters the standby state.

In STEP30, the control means 13 outputs a control signal to the output terminal P8 to output a ringing tone via the transmitting / receiving circuit 4 and the monitor speaker 12. At this point, the device is in a paging reception state. Next, the control means 13 is an input terminal
Check the status of P10 to check if the handset is off-hook, that is, if contact 15b is on (STEP3
1) and check whether the paging signal is still continuing (STEP 32). If the handset is off-hook, proceed to STEP 29. If there is no paging signal, return to the standby state (STEP 20).

In the present embodiment, an example in which there is no DC signal between the mark signal and the identification signal is shown, but when the control signal of the interphone that can only call all at once is an AC signal, it differs from both signals between the mark signal and the identification signal. You may insert the alternating current signal of a frequency.

As described above, according to the present invention, the control signal is activated by the signal from the called device designating means and has the mark signal and the called device designating signal having different lengths according to the output signal of the called device designating means. Of the control signal output from the control signal receiving means and the control signal receiving means for receiving the control signal coming from the communication path, the control signal generating means for generating Detecting means for measuring the lengths of the mark signal and the called device designation signal portion and outputting a coincidence signal when the mark signal is longer than a predetermined length and when the called device designation signal is equal to the predetermined length Allows the simultaneous call to be used mutually even with the conventional system which can only perform the simultaneous call, and further, the individual call can be performed, which has a bad influence on the conventional system. There is nothing.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a telephone terminal device according to an embodiment of the present invention, and FIG. 2 shows an operation when calling another terminal device connected to an extension from the same device. A flow chart, FIG. 3 is a flow chart showing an operation when this device receives a call signal from another terminal device connected to the extension, and FIG. 4 is a control signal when calling a terminal device connected to the extension. It is a timing chart which shows a format. 1 ... Public line 2 ... Extension 3 ... Line closing means 4 ... Sending / receiving means 4a ... Handset 5 ... Interface circuit 6 ... Control signal receiving circuit 7 ... Control signal transmitting circuit 8 ... Device Number setting means 9 …… Dial button 10 …… Line selection means 11 …… Pump calling button 12 …… Speaker 13 …… Control means 13a …… Timekeeping means 13b …… First timer means 13c …… Second timer means 14 …… Dial sending means 15a …… Hook switch 15b …… Hook switch

Claims (1)

[Claims] 1. A called device designating means operated at the time of calling, and a called device designating means having a different length depending on an output signal of the called device designating means which is activated by a signal from the called device designating means. Control signal generating means for generating a control signal having a signal and a mark signal, control signal transmitting means for transmitting the control signal to the communication path, control signal receiving means for receiving the control signal coming from the communication path, and the control signal The length of the mark signal and the called device designation signal portion of the control signal output from the receiving means is measured, and when the mark signal is longer than a predetermined length, it is equal to the unique length to which the called device designation signal is assigned. In this case, the telephone terminal is provided with a detecting means for outputting a coincidence signal and an incoming call notifying means for notifying that the incoming state is established by the coincidence signal output from the detecting means. Apparatus.