JPH0758988B2 - Telephone terminal equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a telephone terminal device capable of connecting a plurality of lines.

2. Description of the Related Art Conventionally, a telephone terminal device that can be used as a public line and an intercom at home has been used. In such a telephone terminal device, in order to make the operation as simple as possible, the public line is given a higher priority than the extension line, and a switch for selecting the telephone line is particularly used when making a call. If the public line is automatically connected to the device simply by lifting (off-hook) the handset without any operation, or if you want to make a call by extension, first specify the extension by the telephone line selection switch and then set the handset. When you lift (off hook), the extension is connected and you can talk. Furthermore, if you want to hold the other party while you are talking to the other party using the public line and want to use the extension to talk to a family member in another room, you can simply operate the switch to select the extension. Is automatically suspended and then switched to an extension to prevent an accident that accidentally opens the public line currently being called and interrupts the call.

Problems to be Solved by the Invention However, in the above-mentioned telephone terminal device, when trying to make a call using an extension having a low priority, the handset is first offset, and then a switch for designating the extension is provided. When operated, the public line with the highest priority is first closed, and the public line is put on hold because the switch that specifies the extension is operated in that state, and the user notices this state. If you are not there, the public line will remain unnecessarily closed for the duration of the call to the extension, and the caller trying to call this line will be busy.
It had a problem that it became impossible to make calls.

The present invention has been made in view of the above-mentioned prior art, and even if the line is not designated by the line selection switch, the handset is automatically connected to a line with a high priority by off-hooking, and a call is answered in response to a call. If you select a different telephone line before it becomes, a telephone line that can prevent unnecessarily closing a telephone line that you do not intend to use without holding the currently closed telephone line. A terminal device is provided.

Means for Solving Problems In order to solve the above problems, the telephone terminal device of the present invention is
From the first and second lines, a line selection unit that is connectable to the first and second lines and that selectively selects any one line, a holding unit that holds the first line, In the state where the incoming signal detecting means for detecting the transmitted communication signal and the first line are selected by the line selecting means, after the incoming signal is detected by the incoming signal detecting means on the first line, the second line is detected. When the selection of the line is instructed, or when the selection of the second line is instructed after the dial data such as the telephone number is detected, the first holding means is used.
The line is held, the line selecting means is made to select the second line, the incoming signal detecting means does not detect the incoming signal on the first line, and the dial data such as the telephone number is not input. Then, when the selection of the second line is instructed, the holding means prohibits the holding of the first line, and the control means controls the line selecting means to select the second line. And

With this configuration, if you switch the line after the line is closed in response to an incoming call, the line that is currently closed is held and then switched to another line, and the line is closed for outgoing. In this case, if a line switching operation is performed, the currently closed line will be switched to another line without being held.

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

FIG. 1 shows a structure 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, and 2 is an extension used as an intercom. Three
Is an external line incoming call detecting means for detecting an incoming call signal coming from the public line 1, 4 is an internal line incoming call detecting means for detecting an incoming call signal coming from the extension line 2, and 5 is a switching which is turned on / off by a control signal. Means 5a and resistor
A holding means for holding the public line 1 composed of 5b, 6
Is a line relay for selectively connecting the apparatus to the public line 1 or the extension line, and 7 is a first contact 7a for closing the line and a second contact connected to the control means 17 described later. A hook switch 7b and a dial sending means 8 for sending a dial signal to the line are constituted by a switching element such as a transistor or a relay. Reference numeral 9 is an interface transformer, 10 is a communication circuit for amplifying a reception signal coming from the line and a transmission signal to be sent to the line, 11 is a transmission device provided in the handset, 12 is a reception device provided in the handset, 13 Is an outside line selection button that is operated when connecting the device to the public line 1, 14 is an extension selection button that is operated when connecting the device to the extension line 2, 15 is a dial button for inputting a dial, 16 Is a timer means for starting an operation by a control signal and generating an output signal after a predetermined time. In this embodiment, it is set to 5 seconds. Reference numeral 17 is a control means for controlling the entire apparatus, which is composed of a microcomputer.

Further, FIG. 2 is a flow chart showing the operation of this apparatus.

The operation of the telephone terminal device configured as described above will be described below. This device is in the standby state, whether there is an incoming call from the public line 1 and the extension 2 (STEP1, STEP2), the operation state of the outside line selection button 13 and the extension selection button 14 (ST
EP3, STEP4) and hook switch 7 status (STEP5)
Are watching. If the incoming call detection means 3 detects an incoming call from the public line 1, the process proceeds to STEP6. If the incoming call detection means 4 detects an incoming call from the extension line, STEP6.
Proceed to step 7, and if operation of the outside line selection button 13 is detected, STEP5
And the operation of the extension selection button 14 is detected, STEP7
When the hook switch 7 is in the off-hook state (the first and second contacts 7a and 7b are in the on state), the process proceeds to STEP11.
If it remains on-hook, return to STEP 1.

In STEP6, the control means 17 sets the internal register LF (logical level "1") and proceeds to STEP5.

In STEP7, the control means 17 switches the line relay 6 to the "B" side by outputting a control signal to the output terminal P9,
The internal register CF is set (STEP8) and the operation of the outside line selection button 13 and the state of the hook switch 7 are monitored (ST
EP9, STEP10). STEP 1 when the outside line selection button 13 is operated
Go to 1 and S when hook switch 7 goes off-hook
Continue to TEP14.

In STEP 11, the control means 17 switches the line relay 6 to the "A" side by outputting a control signal to the output terminal P9,
The internal register CF is reset (logical level "0") (STEP12), the timer means 16 is activated (STEP13) by the output terminal P11, and the process proceeds to STEP14.

In STEP 14, the control means 17 monitors the dial button 15 to see if dial data has been input to the input terminal group P6. ST when dial data is entered
Go to EP15, ST if no dial data is entered
Continue to EP17.

In STEP 15, the dial signal corresponding to the input dial data is output from the output terminal P8, and the dial sending means 8
Then, the register DF in the control means 17 is set (STEP16) and the process proceeds to STEP17.

Here, if the off-hook state is maintained, the interface transformer 9, the communication circuit 10, the transmitter 11, and the receiver 12
You can talk to the other person.

At STEP 17, the control means 17 monitors the state of the hook switch 7 and performs on-hook (first contact and second contact 7a, 7b).
If the hook switch 7 is in the off-hook state, the line relay 6 indicates “A”.
It is connected to the public line 1, which is the "side", and proceeds to STEP 18.

In STEP 18, the control means 17 monitors the operation of the outside line selection button 13, and if it is operated, it proceeds to STEP 27, and if it is not operated, it proceeds to STEP 19.

In STEP 19, the control means 17 monitors the operation of the extension selection button 14, and if it is operated, the process proceeds to STEP 20. This ST
At EP20, it is judged from the internal register DF whether or not the dial data inputted from the dial button 15 is sent from the dial sending means 8 to the public line 1, and at STEP 21, it is judged whether or not there is an incoming call from the public line 1. Judging from Also, in STEP 22, it is determined whether the timer of the timer means 16 has expired. here,
No dial data is sent from the dial sending means 8, there is no incoming signal from the public line 1, and the timer means 16
If the timer has not expired, the control means 17 prohibits the holding means 5 from holding the public line 1 and switches the line relay 6 to the "B" side by the output from the output terminal P9 (ST).
EP23), set internal register CF (STEP24), STEP
Return to 14.

If any one of the dial data to the dial sending means 8, the incoming signal from the public line 1 or the expiration signal of the timer means 16 is detected, the process proceeds to STEP25.

In STEP25, the control means 17 looks at the state of the internal register CF, and if set, returns to STEP14, and if reset, proceeds to STEP26 and outputs a control signal to the output terminal P10 to hold means. The switching means 5a of No. 5 is turned on, the resistor 5b is connected to the public line 1, and the process proceeds to STEP23.

In STEP27, the control means 17 switches the line relay 6 to the "A" side by the output terminal P9, resets the internal register CF (STEP28), and returns to STEP14.

Further, in STEP29 and STEP30, the registers LF and DF in the control means 17 are reset to return to STEP1 to enter the standby state.

As described above, according to the present invention, when the first line is selected by the line selecting means, the second signal is instructed to be selected after the incoming signal detecting means detects the incoming signal on the first line. If the second line is selected after the dial data such as a telephone number is detected, the holding means holds the first line and causes the line selecting means to select the second line. When the incoming signal is not detected by the incoming signal detecting means on the first line and the dial data such as the telephone number is not input and the selection of the second line is instructed, the holding means is held. By providing the control means for prohibiting the holding of the first line by the line and controlling the second line to be selected by the line selection means, the handset can be turned off without specifying the line. If you want to talk to another person on the second line temporarily while talking on the first line with a higher priority by simply clicking Hold the line 1 and switch to the second line. In addition, the handset is off-hook and the first priority is high.
If you try to switch to the second line when there is no incoming call to the line or dial data is not sent out even if the line is connected, that is, when the user has no intention to use the line. , The second without holding the first line
It is possible to realize a telephone terminal device capable of preventing unnecessary closing of a line that is not intended to be used by switching to another line.

[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 is a flow chart showing the same operation. 1 ... Public line 2 ... External line 3 ... External line incoming call detecting means 4 ... External line incoming call detecting means 5 ... Holding means 5a ... Switching means 5b ... Resistor 6 ... Line relay 7 ... Hook switch 7a ... … First contact 7a 7b …… Second contact 7b 8 …… Dial sending means 9 …… Interface transformer 10 …… Talking circuit 11 …… Speaker 12 …… Receiver 13 …… External line selection button 14 …… Extension line Select button 15 …… Dial button 16 …… Timer means 17 …… Control means

Claims (1)

[Claims] 1. A first line and a second line connectable,
Line selecting means for selectively selecting any one line, holding means for holding the first line, and incoming signal detecting means for detecting incoming signals sent from the first and second lines. In the state where the first line is selected by the line selecting means, if the second signal is instructed to be selected after the incoming signal is detected by the incoming signal detecting means, or the telephone is called. Second after detecting dial data such as number
When the selection of the line is instructed, the holding unit holds the first line and the second line is held by the line selecting unit.
Is selected, and the selection of the second line is instructed in the state where the incoming signal is not detected by the incoming signal detecting means on the first line and dial data such as a telephone number is not input. And a control means for prohibiting the holding of the first line by the holding means and controlling the second line to be selected by the line selecting means.