JP2753305B2 - Telephone exchange system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone switching system that switches between external and internal lines or between internal lines so as to enable external and internal telephone calls with a commercially available telephone. It is.

[Prior Art] This type of telephone exchange system is composed of a telephone exchange connected to a telephone office via an external line, and a plurality of telephone exchanges connected to the telephone exchange via an extension line and a control line, and to which a commercially available telephone is detachably connected. A telephone outlet is provided, and a communication path between an outside line and an inside line or between inside lines is switched to form a outside line call and an inside line call with a commercially available telephone. Further, in this telephone exchange system, a signal for notification is transmitted from the telephone exchange to the telephone outlet via a control line, and the notification operation is performed at the telephone outlet.

[Problems to be Solved by the Invention] By the way, in this type of telephone exchange system, if the telephone C is not connected to the telephone outlet B, a person in the room where the telephone outlet B is installed is called or the sound of the room is sounded. There was inconvenience that I could not hear.

The present invention has been made in view of the above points, and its purpose is to call a person in a room where another telephone outlet is installed and to monitor the sound of the room. To provide a telephone exchange system.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects an extension connected to one telephone outlet to a control line connected to the other telephone outlet, and connects the extension to one telephone outlet. Sending the voice of the telephone set to the speaker of the other telephone outlet, connecting the extension connected to one telephone outlet to the control line connected to the other telephone outlet, and turning on the speaker of the other telephone outlet. There is provided a sound transmission / monitoring means for switching between a monitoring operation of transmitting a sound collected as a microphone to a telephone connected to one telephone outlet.

[Operation] According to the present invention, by providing the above-described configuration, the extension to which the telephone outlet is connected by the voice transmitting / monitoring means is connected to the control line to which another telephone outlet is connected, or the telephone outlet is connected. Or by connecting the extension to a control line to which another telephone outlet is connected, so that voice can be sent from the telephone to the speaker of the telephone outlet installed in another room so that a voice call can be made.
Since the sound collected by the speaker can be monitored by the telephone, when calling the telephone connected to the telephone outlet provided in another room from the telephone, if the other handset of the telephone is not picked up But
The sound is output from the speaker of the other party's telephone outlet, and the sound collected by the speaker of the other party's telephone outlet is monitored, and the sound is mutually exchanged between the telephone and the telephone outlet provided in another room. Can be transmitted.

FIG. 1 shows an embodiment of the present invention. The telephone switching system the telephone exchange A in conjunction with an outside line l ₁ a via with telephone station and connecting a plurality of telephone outlet B to the telephone exchange A via the extension l ₂ and a control line l _3, further call It is connected intercom D to the telephone exchange a with a line l _4.

Each telephone outlet B is provided with a modular jack M so that a general commercially available telephone C can be detachably connected by the modular jack M. Also,
This telephone outlet B is provided with a speaker SP for reproducing the broadcast signal, such as an extension or intercom call sound transmitted through the control line l _3.

As shown in FIG. 1, the telephone exchange A includes an incoming call detection circuit 2 for detecting an incoming call from an outside line, a holding circuit 3 for holding an outgoing call state when an outgoing call is received and enabling an internal call or a door phone call. l ₁ and extension l ₂ , extension l ₂ together, or extension
the call control circuit 4 for switching and forming a communication path between the l ₂ and the telephone line l _4, the doorphone speech circuit 5 provided in order to perform the intercom call the phone C, notification sound, such as extension or intercom call sound Out to telephone outlet B
It comprises an audio transmission / monitor circuit 6 as monitoring means, and a control circuit 1 comprising a CPU for performing operations such as a control information signal transmission control of each circuit and a signal determination process.

An outline of the operation of the telephone exchange A will be described. First, the phone C is off-hook in the waiting, the off-hook state call control circuit 4 detects, for connecting the extension l ₂ to the control circuit 1. At this time, the control circuit 1 sends a pseudo dial tone to each phone C via the extension l _2. Then, when the telephone C is dialed and the first dial signal is inputted, the transmission of the pseudo dial tone is stopped. The data (number) of the dial signal is temporarily stored in a built-in buffer, and at the same time, the operation of a built-in 3-second timer is started. When the second dial signal is input during the operation of the timer, the telephone exchange A determines that the call is an outside line. If there is no input of the second dial signal within three seconds, it is determined that the call is an extension.

In the case of an outgoing call, the control circuit 1 successively stores the data of the dial signal to be successively inputted in the built-in buffer and controls the holding circuit 3 including the DC closing circuit to close the line. Let When an outside line dial tone is detected, the data indicating the dial number stored in the internal buffer is sequentially read from the first, and a dial signal is sequentially transmitted to the outside line by operating a push button dialer (not shown) or a dial relay (not shown). _The extension l ₂ and the outside line to which the telephone C dialed after a certain time has been connected
l and ₁ are connected by the communication control circuit 2 to enable external line communication.

Next, the operation of the extension call will be described. When making this extension call, the telephone C is off-hook and a dial signal for specifying the telephone C of the other party to be called is input. Since this dial signal is a single number, the second dial signal is not input even after 3 seconds set in the built-in timer of the telephone exchange A. Accordingly, the telephone exchange A determines that this is an extension call. This time is sent via the voice sending / monitor circuit 6 to the control line l ₃ that corresponds to the phone C to the appropriate broadcast signal for extension call sound data dial signal to. At the telephone outlet B to which this notification signal has been transmitted, a ringing tone is emitted from the speaker SP. When the handset of the telephone C is taken up by this Hatsuna, the telephone exchange A detects this off-hook, and connects the extension l ₂ of the called an extension l ₂ of the calling side at the call control circuit 2 extension Make calls possible.

In the above-described case, the specific telephone C is called, but in this telephone exchange system, the telephone C can be simultaneously called. This simultaneous calling is performed by inputting a dial signal corresponding to the simultaneous calling. When the dial signal is input, the telephone exchange A sends a notification signal for call tone via the control line l ₃ in the telephone outlet B.
When one of handset of the telephone C This ring tone is taken up, the control circuit 1 and the extension l ₂ of the phone C is connected subjected to paging, the extension l ₂ of the phone C is connected with pick up the handset Is controlled by controlling the call control circuit 2 to enable extension calls.

Next, a case where an outside line is received will be described. When an incoming detection circuit 2 detects an incoming signal, the external line l ₁ each extension l ₂
To make the built-in bell of the telephone C connected to each telephone outlet B ring. When taken up the handset of any telephone C This ringing extension l ₂ only external line l phone C control to the handset is picked up the call control circuit 4 of this control circuit 1 detects is connected Connect to ₁ to enable external calls.

Further, in this telephone exchange system, it is possible to hold a call for performing an extension call or a door phone call during the external call. Also in the case of this hold operation, a dial signal corresponding to the hold is input by the telephone C. The control circuit 1 reads the dialing signal, and controls the call control circuit 4 releases the communication path between the extension l ₂ and external l ₁ became in external call, the extension l ₂ another extension l ₂ or connected to a call line l ₄ doorphone D, and allows the extension call and intercom call. Then, external l ₁ is the period of such the extension call is maintained on hold on hold circuit 3.

When returning from the above-mentioned hold state to the outside-line communication state again, a dial signal corresponding to the above-mentioned hold is input again from the telephone C, and the control circuit 1 which has detected this dial signal cancels the hold operation, and Each section is controlled in the above-described outside line communication state to enable outside line communication.

In addition, as shown in FIG.
A voltage detecting circuit 7 for discriminating a voltage signal transmitted through the control line l ₃ display signal, and a light-emitting display device LD of the light emission controlled external and in the extension of a call in the voltage detection circuit 7 respectively displayed It has. The notification signal is transmitted to the telephone outlet B while being superimposed on the display signal.

The above has been a description of the basic components of the telephone exchange system. Hereinafter, features of the present embodiment will be described. In the present embodiment, even when the handset of the telephone C of the other party is not picked up by the extension call, the voice is sent to the telephone outlet B of the other party, and the voice can be output from the speaker SP of the telephone outlet B. . That is,
A control circuit 1 is provided between a notification sound generation circuit 8 for generating a notification sound such as a ringing sound of a voice transmission / monitor circuit 6 and a speaker driving amplifier 9 for amplifying an output of the notification sound generation circuit 8.
The switching circuit 13 is controlled by the switch, and the notification sound generating circuit 8 is provided.
Or it sends a notification signal for call sound control line l ₃ from, or the audio signal from the call control circuit 4 are as or transmit to the control line l ₃ can be selected. That is, by switching the switching circuit 13 to the call control circuit 4 side, and the extension l ₂ of the phone C is connected with the calling, the control line of the telephone outlet B of the called telephone C is connected
The communication path is formed between l _3, it is to be able to emit sound calling from the speaker SP of telephone outlet B.

Further, in this embodiment, the speaker SP of the telephone outlet B is used.
Is used as a microphone to collect sound in a room where another telephone outlet B is installed, and this sound can be heard by the telephone C. Speaker SP used in the telephone exchange system is generally a dynamic speaker, the control line via the capacitor C ₁ as shown in FIG. 2 l ₃
, It can be used as a microphone if the output of the speaker SP is amplified. Therefore, the switching means 10 to decouple the voice sending / monitor circuit 6 control lines l ₃ to telephone outlet B each are connected to as shown in FIG. 3 from the amplifier 9, either to the amplifier 12 for amplifying the audio signal It is provided with a switching means 11 for connecting the control line l _3.

Hereinafter, this monitoring operation will be described with reference to the flowchart of FIG. In the present embodiment, the monitoring operation is automatically shifted to after a certain period of time has elapsed since the extension was called. In addition, when a call is made but the other party does not answer, it is possible to manually shift to the monitor operation by performing a predetermined operation, for example, by taking up the handset of the telephone C while making a booking. Assuming that a certain time no response by performing a call has passed, the control circuit 1 with disconnected all the control line l ₃ from the amplifier 9, closing the contacts of the switching means 11 corresponding to the phone C was performed call By that control line l ₃ amplifier
Connect to 12. At this time the extension l ₂ of the phone C is connected with the calling call control circuit 12 so as to be connected to the amplifier 12 and the switching control simultaneously, thereby the calling extension l ₂
And forming a communication path between the control line l ₃ on the side called the. Therefore, the voice collected by the speaker SP can be heard by the calling telephone C.

[Effects of the Invention] As described above, the present invention connects an extension connected to one telephone outlet to a control line connected to the other telephone outlet, and transmits voice of a telephone connected to one telephone outlet to the other. Voice transmission operation to be sent to the speaker of the telephone outlet, and the extension to which one telephone outlet is connected to the control line to which the other telephone outlet is connected, and the sound collected by using the speaker of the other telephone outlet as a microphone. Since the voice transmitting / monitoring means for switching the monitoring operation to be transmitted to the telephone connected to one telephone outlet is provided, the extension connected to the telephone outlet by the voice transmitting / monitoring means is connected to another telephone outlet. Connected to a telephone line, or the extension connected to a telephone outlet to a control line connected to another telephone outlet. Therefore, the telephone can send a voice to a speaker of a telephone outlet installed in another room to make a call by voice, and the sound collected by the speaker can be monitored by the telephone, so that the telephone can be installed in another room. When calling the telephone connected to the telephone outlet that was connected, even if the handset of the other telephone is not picked up, sound is output from the speaker of the other telephone outlet and the speaker of the other telephone outlet is used. There is an effect that the collected sound is monitored and the sound can be transmitted between the telephone and the telephone outlet provided in another room. In addition, since the existing speaker is used as a microphone in the telephone outlet and the number of added circuit configurations is small, there is an advantage that the size and the cost are not increased, and the wiring for connecting the telephone outlet and the telephone exchange is provided. Also requires four lines as before.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram of a telephone outlet, FIG. 3 is a specific circuit diagram of a voice transmission / monitor circuit, and FIG. It is a flowchart shown. A is a telephone exchange, B is a telephone outlet, C is a telephone, E
Is a telephone office, SP is a speaker, 1 is a control circuit, 6 is a voice transmission / monitor circuit, 10 and 11 are switching means, and 13 is a call switching circuit.

Continuation of the front page (56) References JP-A-63-227253 (JP, A) JP-A-63-14559 (JP, A) JP-A-62-278894 (JP, A) JP-A-58-56597 (JP, A) JP-A-2-214362 (JP, A) JP-A-53-94018 (JP, U) JP-B-55-27491 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB H04M 3/42 H04M 11/00-11/10 H04Q 9/00-9/16 H03J 9/00-9/06 H04Q 3/58-3/62

Claims (1)

(57) [Claims] 1. A telephone exchange connected to a telephone office via an external line, and a plurality of telephone outlets connected to the telephone exchange via an extension line and a control line and to which a commercially available telephone is detachably connected, The telephone exchange changes the communication path between an external line and an internal line or between internal lines to enable external telephone calls and internal telephone calls with the telephone, and sends a notification signal from the telephone exchange to a telephone outlet via a control line. In the telephone exchange system in which the notification operation is performed from the speaker of the telephone, the extension connected to one telephone outlet is connected to the control line connected to the other telephone outlet, and the voice of the telephone connected to one telephone outlet is transmitted to the other. Voice transmission operation to be sent to the speaker of the telephone outlet, and the extension to which one telephone outlet is connected is connected to the other telephone outlet. A telephone exchange comprising voice transmission / monitoring means for switching between a monitoring operation of connecting to a telephone line connected to a telephone line connected to the other telephone outlet and a monitor operation of transmitting sound collected using a speaker of the other telephone outlet to a telephone connected to the one telephone outlet. system.