JPH0731658Y2 - Telephone exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a telephone exchange.

[Prior Art] Conventionally, this type of telephone exchange to which an intercom subunit can be connected has received a call from the intercom subunit, either while a ringing tone is sounding or for a certain time (for example, after the ringing). 30
If the handset of the telephone connected to the extension is lifted within a second), it is customary that a call path is formed between the telephone and the intercom subunit, and the call is established.

[Problems to be solved by the invention] However, in the case of the conventional example, it is necessary to always raise the handset of the telephone. For example, when a family member goes home to open the front door, raise the telephone once and intercom. It was very troublesome because I had to make a call with the child device to confirm that the family members returned home.

The present invention has been made in view of the above problems, and an object thereof is to set an intercom broadcasting mode in which a call audio signal from an intercom subunit is broadcast from a speaker connected to a signal line. There is a telephone exchange that can be provided.

[Means for Solving the Problem] The present invention provides an incoming call detecting means for detecting the presence or absence of an incoming call from an outside line, an extension call detecting means for detecting an extension call from a telephone connected to each of a plurality of extensions, and an intercom subunit. The intercom call detecting means for detecting the call of the call, and the incoming call detection of the incoming call detecting means to connect each extension line and the outside line to form a communication path, and the extension call detecting means to detect the extension call By connecting the extension that is connected and the extension that is connected to the telephone of the called side to form an extension communication path, connect the communication line of the intercom subunit and each extension when the intercom call detection of the intercom call detection unit is detected. Connected to the connecting means for forming a communication path, the ringing tone generating means for transmitting the ringing tone signal through the signal line provided corresponding to each extension at the time of calling the extension or doorphone, and the ringing tone signal connected to the signal line. Play In a telephone exchange equipped with a speaker for notifying a ringing tone, the intercom broadcast mode changeover switch and the setting state of this intercom broadcast mode changeover switch are taken in, and the intercom ringing detection means of the intercom call detection means is set when the broadcast mode is set. When the doorphone ringing detection is detected, the call voice signal from the doorphone subunit that is sent through the call line of the doorphone subunit within a certain time after the doorphone ring is detected is superimposed on the signal line and played from the speaker connected to the signal line. It is provided with means for switching the intercom broadcast mode.

[Operation] If the broadcast mode changeover switch is turned on to the broadcast mode side, the call voice signal of the voice spoken on the side of the doorphone handset within a certain time after the call is made when calling from the doorphone handset. It is sent to the signal line through the main unit.

This transmitted call voice signal will be broadcast all at once from the speaker connected to the signal line, so that the caller's requirement can be known without raising the handset of the telephone.

[Embodiment] The present invention will be described below with reference to an embodiment.

FIG. 1 shows the configuration of the entire system of an embodiment of the present invention. Two lines L ₁ and L that constitute an external line 3 from a telephone exchange to a main unit 1 of a telephone exchange through a switch 2 in a main unit 1 of the telephone exchange. ₂ is connected, the intercom subunit 4 is connected via the telephone set 5 consisting of a pair of lines, and the signal line 6 consisting of a pair of lines is connected.
And each telephone outlet 8 is connected through an internal line consisting of an extension line 7 consisting of a pair of lines. Further, an operation knob 35a of an intercom broadcast mode switching switch 35, which will be described later, is operably exposed in a recess 37 with a lid 36 on the front surface side.

The telephone outlet 8 is configured such that the extension 7 is connected to the modular jack 9 and the ordinary telephone 10 is connected to the modular jack 9. As shown in FIG. 2, the signal line 6 is a ringing tone signal superimposed on the signal line 6 when the telephone exchange 1 calls an extension or a doorphone, and a call voice signal from the intercom subunit 4 when broadcasting the intercoms. A speaker 11 that reproduces a sound signal such as, and a voltage discrimination circuit 12 that discriminates a voltage signal applied according to the line state are connected, and the voltage discrimination circuit 12 responds to the discriminated voltage,
The light emitting elements LEDa and LEDb that indicate whether the extension call is being made or the extension call is being made are turned on and off. The variable resistor 13 is a variable resistor for adjusting the volume, and the capacitor 14 is a DC cut capacitor.

FIG. 3 shows the internal configuration of the main unit 1 of the telephone exchange used in this embodiment. The incoming call detection unit 15 for detecting an incoming call from the outside line 3, the outside line 3, the extension line 7 ... A transmission / reception coupling transformer 16, a holding sound generating unit 17, each extension line 7 ..., an outside line unit 18 ₁ ..., and a DC closing unit 19 that performs a DC closing to send a connection signal to the outside line 2, A call current detection circuit 20 for detecting a call current flowing when the line is closed by an extension 7 ..., a telephone 10 directly connected to the outside jack 3 through a modular jack 9 while receiving an outside call, and external crime prevention and disaster prevention. A security signal input terminal 21 for connecting a sensor, and a security signal detection unit 22 for converting into a digital signal according to the presence or absence of a security signal consisting of a low frequency signal input from the security signal input terminal 21.
And a crosspoint switch 23 including an analog switch for setting a call path, an outside line transmission detection unit 24, a connection terminal 25 for connecting an emergency button, a push button dialer 26 for making an outside line call, and a dial relay Ryd. , The connection terminals 27 ₁ and 27 ₂ for connecting the intercom slave 4, and the call signal detection unit for detecting the call signal from the intercom slave 4.
28 ₁ , 28 ₂ , intercom slave 4, crosspoint switch
An intercom communication circuit 29 for connecting to 23, and a sound source generating section 30 for creating a notification sound signal as a signal indicating a line state sent via the signal lines 6 ... Or the extension lines 7 ...
A display I / F drive unit 31 for applying a signal indicating a line state to the signal lines 6 as a DC voltage signal, a hook / dial pulse detection unit 32 provided corresponding to each extension line 7, and each extension line 7. Current source 33 for supplying call current to ...
And an external line switching relay Ry _1, which is a connecting means for switching the connection between the extension line 7 and the external line 3 and the connection between the extension line 7 and the crosspoint switch 23, and the intercom subunit 4 and the intercom communication circuit 29. Switch elements S ₁ and S ₂ for connection, switch element S ₃ for connection between push button dialer 26 and coupling transformer 16, and coupling transformer 16
And a push button dial signal receiving unit 18 ₁ and a switch element S _4, and an amplifier A ₁ for sending a notification sound signal to the telephone outlet 8 via the signal line 6 or the extension 7. And a control circuit forming a center for performing control of sending out control information signals of these circuits and elements, and further performing signal determination processing
34 and an intercom broadcast mode switch 35. In the figure, G ₁ ... Is a gate. Further, a power supply unit for supplying power to each unit is provided, and a connection terminal for connecting the external line 3, each signal line 6 ..., Internal line 7 ...

When the main unit 1 of this telephone exchange is turned on and the system starts, the control circuit 34 consisting of a one-chip microcomputer first makes initial settings, and then goes into a standby state to determine whether it is off-hook or not. The presence / absence determination and the outside line call processing, the presence / absence of the intercom calling and the interphone call processing, the presence / absence of the extension call and the extension call processing, the outside line call processing, and the like are performed.

Next, the operation of the entire system shown in FIG. 1 will be outlined based on the circuit shown in FIG.

Now, for example, when the handset of the telephone 10 connected to a certain telephone outlet 8 is lifted, the corresponding switching contact r _{1 of} , for example, the outside line switching relay Ry ₁ is connected to the a contact side, that is, the crosspoint switch 23 side. Since it is in a state, the corresponding hook / dial pulse detection unit 32
Detects an off-hook and outputs a detection signal to the control circuit 34. The control circuit 34 turns on Xs ₁₀ of the crosspoint switch 23, and sends a pseudo transmission signal of 400 Hz output through the gate G ₃ to the telephone outlet 8 through the crosspoint switch 23 and the extension 7. At the same time control circuit
Reference numeral 34 controls the display I / F display drive 31 to output a voltage signal for lighting the light emitting element LEDa for external line busy display in each telephone outlet 8. At this time, the light emitting element LEDb indicating that the extension is busy is controlled to be in the off state. This transmission continues until the dial signal is input, and the first dial signal is the hook / dial pulse detection unit 32 (push dial if the push dial type is used. Signal receiver 18
_When detected in ₂ ), the control circuit 34 stops the output of the pseudo transmission signal and stores the dial data in the built-in buffer memory. Then, the built-in 3-second timer is operated. When the second dial signal is detected during the operation of this timer,
It is judged as an outside call. If there is no input of the second dial signal within this 3 seconds, it is determined that the call is an extension call and the extension call processing is performed.

On the other hand, in the case of an outside line call, the data of the dial signal to be subsequently input is sequentially stored in the buffer memory and a signal for operating the DC closing section 19 is output. When the external line dial tone detection unit 24 detects an external line dial tone by the line closing by the DC block unit 19 and the detection signal is input to the control circuit 34, the control circuit 34 first sets the dial data stored in the buffer memory. Sequentially reading from the above, the switch element S ₃ and the push button dialer 26 are operated, or the dial relay Ryd is operated to sequentially send the dial signals to the outside line 3. At the same time, the dial signal data input from the telephone 10 is stored in the buffer memory.

In this manner, the dial data from the telephone 10 is stored in the buffer memory at the same time when the dial signal is sent to the outside line 3. When the dial data stored in the buffer memory is lost and a certain period of time elapses, the external telephone call is started. When sending the dial signal to the outside line 3, the line closing is interrupted. Push button dialer
Whether to operate 26 or dial relay Ryd is set depending on the type of line. In the figure, rd is a relay contact of the dial relay Ryd, which is used to connect and disconnect the line for dial transmission and is normally closed.

Thus, the outside line call is coupled transformer 16, mute switch element S ₄ , cross point switch 23, switching contact r ₁ ...,
It will be done via extension 7.

Next, the operation when calling the extension will be described.

First, the telephone 10 connected to the telephone outlet 8 having a dial signal transmits, and after the pseudo call signal is output, if the next dial signal is not transmitted within 3 seconds,
The transmitted dial signal data is judged as an extension number,
The control circuit 34 so as to set the speech path to extension 7 which is calling with turns off the Xs ₁₀ of crosspoint switch 23 which is turned from the off-hook disconnect the external 3 Xs ₁₇
Turn on. Also, the voltage signal that turns off the light emitting element LEDa of each telephone outlet 8 that has been turned on from the off-hook and at the same time turns on the light emitting element LEDb that indicates the extension busy is displayed.
Output from the I / F display drive unit 31. Further control circuit 3
Reference numeral 4 controls the sound source generator 30 to output a sound signal for calling the extension. This sound signal is sent through extension 7 ...
Also, it is superposed on the signal line 6 of the telephone outlet 8 corresponding to the extension number called through Xs _{05 of the} cross point switch 23. Note that these are sent out alternately.
At the telephone outlet 8 to which the sound signal is sent, the speaker 11 emits a ringing tone. When the handset of the telephone 10 connected to the telephone outlet 8 is picked up by this sounding, the hook / dial pulse detector 32 detects this off-hook and sends a detection signal to the control circuit 34. Based on this off-hook, the control circuit 34 stops the generation of the sound signal, and at the same time, the crosspoint switch 23
Xs ₂₇ is turned on to connect the extension 7 of the telephone outlet 8 of the calling side and the extension 7 of the telephone outlet 8 of the called side to establish a call state.

After that, a telephone call between the telephone 10 connected to the telephone outlet 8 and the telephone 10 connected to another telephone outlet 8 can be performed. At this time, the outside line switching relay R
y ₁ and Ry ₂ are maintained while connecting the switching contacts r ₁ and r ₂ to the a contact side.

In addition, at the time of simultaneous extension calling, a ringing tone is emitted from the speaker 11 of each telephone outlet 8.

By the way, when an incoming call signal is input from the outside line 3, the incoming call detection unit 15 detects the incoming call signal and outputs the incoming call detection signal to the control circuit.
Output to 34. When the incoming detection signal is input, the control circuit 34 stops the excitation of each external line switching relay Ry ₁ ... And switches each switching contact r ₁ ... To the b contact side. Therefore, the telephone 10 connected to each telephone outlet 8 ... is the extension 7 ...
Is connected to the outside line 3 through and the built-in bell rings in each telephone 10. When the handset of the telephone 10 connected to a certain telephone outlet 8 is lifted by this ringing, a call current flows in the line. This call current is detected by the call current detection circuit 20, and by this detection, the control circuit 34 detects that any of the telephones 10 ... Is turned off, and turns on the DC connection section 19, and at the same time, the outside line switching relay Ry ₁ ... can be excited to switch each switching contact r ₁ ... to the a contact side. As a result, the hook / dial pulse detection unit 32 can detect off-hook and the control circuit
34 detects that the handset of the telephone 10 connected to the telephone outlet 8 is picked up, and at the same time as this detection, Xs _{10 of the} crosspoint switch 23 is detected.
Is turned on to connect the outside line 3 and the extension line 7 of the telephone outlet 8 to enable outside line communication.

When it is desired to make an extension call or to make a doorphone call during the above-mentioned outside call, the call can be put on hold.

First, when the handset of the telephone 10 is not on-hook in a DC closed state during an outside line call and a dial signal corresponding to the hold, such as "0", is sent from the telephone 10 in advance,
The control circuit 34 reads the data of the dial signal, determines that it is a holding operation, and performs a holding process for canceling the communication state between the extension 7 and the outside line 3. That is, Xs _{10 of the} crosspoint switch 23 is turned off, and Xs ₁₁ and Xs ₁₇ are turned on. Then, the on-hold sound generating section 17 is operated to output the on-hold melody signal to the outside line 3 via the coupling transformer 16, and the amplifier A ₄ ,
The signal is superposed on each signal line 6 through the cross point switch 23 and the amplifier A _1, ... Further, under the control of the control circuit 34, the display I / F drive section 31 sends a voltage signal for simultaneously displaying the internal line and the external line to the respective telephone outlets 8 through the signal lines 6 and the respective light emitting elements LEDa. Then, turn on LEDb. That is, the hold tone melody signal informs the other party of the telephone through the outside line 3 that the telephone is on hold, and at the same time, the speaker 11 of the telephone outlet 8 to which each telephone 10 is connected.
A hold melody sound is played back to notify the user that the call is on hold, and at the same time, the light emitting elements LEDa and LEDb emit light to indicate that the call is on hold.

After the hold, even if the telephone 10 is hooked on and the call ends, the DC connection unit 19 is maintained in the ON state and the call operation is started.

Next, if the user wants to make an outside line call again, the hold is released.
To release the hold, any one of the off-hook telephones 10 may send a dial signal of "0", and the control circuit 34 which detects the dial data of "0" stops the operation of the hold sound generating unit 17 and Each part is controlled to the outside line call state. When the call after releasing the hold is terminated and the telephone set 10 is hooked again, the DC closing unit is controlled under the control of the control circuit 34.
The DC closure by 19 is released.

Now, after the above-mentioned hold state, if the dial data to be input is other than "7" for designating an intercom call, an extension call is made to connect to the telephone outlet 8 of the extension number by the extension processing described above.

When the dial data of "7" is input, the control circuit 34 determines that the call is an intercom call and Xs of the crosspoint switch 23.
₁₁ is turned off, and at the same time, Xs _{13 of the} crosspoint switch 23 corresponding to the doorphone call line is turned on. Then, for example, the switch element S ₁ is turned on to connect the intercom subunit 4 to the intercom communication circuit 29 to enable intercom communication.

By the way, when there is a call from the intercom subunit 4 in the standby state, the sound signal of the chime sound of the intercom call generated from the sound source generation section 30 is generated through the signal line 6 ... And send it to ... At this time, if the intercom broadcast mode changeover switch 35 is turned on, the control circuit 34 having the intercom broadcast mode changeover function controls the crosspoint switch 23 after the chime sound is emitted. A call path is formed between the device 4 and the signal line 6 for a certain period of time (for example, 30 seconds), and a call voice signal input from the intercom subunit 4 is superimposed on the signal line 6 during that time, and all the telephone outlets 8 are connected. The call voice of the visitor is broadcast from the speaker 11. Thus, the visitor's requirements are known without having to pick up the telephone 10 handset.

Of course, if the handset of the telephone 10 is picked up within the above-mentioned fixed time, it is formed under the action of the control circuit 34 of the communication path between the telephone 10 and the intercom slave 4, and the above-mentioned broadcast is interrupted, and the intercom slave 4 and the telephone 10 are in a call state.

Also, when the intercom broadcast mode switch 35 is off, that is, when the non-broadcast mode is set, while the ringing chime sound is heard and for a certain period after that (for example,
When any one of the handsets of the telephone 10 is picked up for 30 seconds), a call path is formed between the telephone 10 and the intercom subunit 4 through the crosspoint switch 23 under the control of the control circuit 34, and the intercom You can talk.

[Advantage of the Invention] The present invention, in the telephone exchange configured as described above, takes in the intercom broadcast mode changeover switch and the setting state of this intercom broadcast mode changeover switch, and calls the intercom while the broadcast mode is set. When the intercom call detection of the detection means is received, the call voice signal from the intercom sub unit, which is sent through the call line of the intercom sub unit within a certain time from the detection of the intercom call, is superimposed on the signal line and is connected to the signal line. Since it was equipped with intercom broadcasting mode switching means to play from the speaker,
By operating the intercom broadcast mode switching switch, you can switch between normal intercom calling and a mode in which the call voice of the visitor can be broadcast simultaneously through the speaker without picking up the handset of the telephone. Therefore, by setting the intercom broadcasting mode, you can understand the requirements without having to pick up the handset of the telephone, which has the effect that it can be used very effectively when a family member comes home.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a telephone exchange system using an embodiment of the present invention, FIG. 2 is a circuit configuration diagram of a telephone outlet of the above, and FIG. 3 is a circuit configuration diagram of a main device of the same. 1 is a main unit, 3 is an outside line, 4 is an intercom sub unit, 5 is a communication line, 6 is a signal line, 7 is an extension line, 8 is a telephone outlet, 10 is a telephone, 34 is a control circuit, and 35 is an intercom broadcasting mode switch. It is a switch.

Claims (1)

[Scope of utility model registration request] 1. An incoming call detecting means for detecting the presence or absence of an incoming call from an outside line, an extension call detecting means for detecting an extension call from a telephone connected to each of a plurality of extensions, and an intercom for detecting a call from an intercom subunit. Upon receiving an incoming call detected by the incoming call detecting means, each extension line is connected to an external line to form a communication path, and an internal line connected to the calling side telephone and a called line are detected upon detecting an internal call from the internal call detecting means. A connecting means for connecting extension lines connecting the telephones on the other side to form an extension call path, and connecting the call line of the intercom subunit and each extension line to form a call path upon detection of the intercom call by the intercom call detection means And a ringing tone generating means for transmitting a ringing tone signal through a signal line provided for each extension when calling an extension or a doorphone, and is connected to the signal line to reproduce a ringing tone signal to notify the ringing tone. Spice In a telephone exchange equipped with a switch, the intercom broadcast mode changeover switch and the setting state of this intercom broadcast mode changeover switch are taken in and when the intercom call detection of the intercom call detection means is received when the broadcast mode is set. Switch the intercom broadcast mode to superimpose the call voice signal from the intercom subunit sent to the intercom subunit within a certain time from the detection of the intercom ringing on the signal line and play it from the speaker connected to the signal line. A telephone exchange equipped with means.