JPH0628869Y2 - Telephone device calling circuit - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention is a main unit of a key telephone device (hereinafter referred to as a telephone device), and is an extension for making an extension call after individually calling the telephones of the other party who wants to make a call, in a paging route for calling a plurality of telephones at the same time. The present invention relates to a calling circuit of a telephone device capable of securing the number of extensions which is one more at the same time than the number of installed extensions by adding the function of.

[Prior art]

Conventionally, in a telephone device in which a main device and a telephone are connected by a call line and a control line, the call line in the main device is connected and controlled by a crosspoint switch to one of a plurality of extensions and a paging path. Although it is configured, for example, in a telephone device having three lines of office lines and one line of extension lines, when one telephone set captures the extension, the other telephones cannot simultaneously capture the extension, so that the other telephones can use the extension line. There was a problem that I could not make a call. In order to solve this problem, conventionally, a method of adding extension lines as shown in FIG. 1 has been proposed. FIG. 1 is a block diagram of a small-sized telephone device (with two extension lines) related to a conventional calling circuit. In FIG. 1, ME is a main device, TEL1, ..., TELn
, Sr1, ..., Srn are signal switching relays, N
W1, ..., NWn are telephone communication circuits, CX ^q _p (p is 1
~ N and q are 1 to 3) are crosspoint switches, SW
, ..., SW5 are switching circuits, CN1 to CN2 are signal transmission circuits composed of transformers, etc., C1 to C3 are capacitors, A is a low output impedance amplifier, L1,
, Ln are a pair of communication lines, B1, ..., Bn are telephone amplifiers, SP1, ..., SPn are speakers, ICM1,
ICM2 is a pair of extension lines, and ALL is a pair of paging routes. 1 is a service tone generation part such as a dial tone, 2 is an intercom,
3 is a power supply for supplying an extension call current and a DC current for superimposing ringing voices at the time of simultaneous ringing. 4 is a crosspoint switch CX ^q _p of the main device, a switching circuit SW1,
..., a control device for controlling SW5 and the like, 5 is a control line, 61,
..., 6n is a telephone control device. Conventionally, a circuit for calling a plurality of telephones all at once has a dedicated paging path ALL to which a low output impedance amplifier A is always connected. For this reason, in a small-scale telephone device, when it is possible to capture the extension from two telephones at the same time, two extension lines (ICM1,
ICM2) and a paging path AL connecting a low output impedance amplifier A for paging a plurality of telephones
I had to have L independently. First, the operation of individual calling by voice in the calling circuit of the conventional telephone device shown in FIG. 1 will be described. Now, when the telephone TEL1 is operated to call the telephone TEL2 individually, for example, by voice, a telephone control device 61 sends an extension capture request from the calling telephone TEL1 to the main device ME via the control line 5. Sent. Main device ME
In response to the extension acquisition request from the calling telephone TEL1, the main unit control unit 4 causes the crosspoint switches CX ¹ ₁ and S
Close W3. When the above circuit is closed, the calling telephone set T
The EL1 power _{^{3-SW3-CX 1 1 -L1}} -Sr1-N
While the call current is supplied through the path of W1, a service tone (here, a dial tone) is generated by the service tone generating unit 1, and the service tone generating unit 1-CN1-C1-C
In the path of X ^{₁ 1} -L1-Sr1-NW1 is superimposed on the speech current, it is transmitted to the telephone TEL 1. Now phone extension TEL2 at calling telephone TEL1 is dialed, the control unit 4 of the main device ME with stops sending the service tones and閉結crosspoint switch CX ¹ _2. When the crosspoint switch CX ¹ ₂ is closed, the telephone current from the power source 3 is supplied to the telephone TEL ₂ . On the other hand, since the telephone control device 62 of the called telephone TEL2 activates the signal switching relay Sr2, the calling voice from the calling telephone TEL1 is output from the speaker SP2 of the called telephone TEL2 through the following route. ^{NW1-Sr1-L1-CX 1} 1 -CX 1 2 -L2-Sr2-B2-SP2 the call receiving sound handset of the called telephone TEL2 is raised, the telephone control unit 62 has a signal switching relay Sr2
Calling telephone TEL1 and called telephone TE to restore
An extension communication state is established with L2 on the next route. ^{NW1-Sr1-L1-CX 1} 1 -CX 1 2 -L2-Sr2-NW2 then call from the telephone TEL1 simultaneously a plurality of telephones, the operation when the paging making a call and response to phones. When the handset of the calling telephone TEL1 is lifted, the service tone is supplied to the calling telephone TEL1 as in the case of individual calling. Next, when the calling telephone TEL1 calls all the telephones at the same time, the telephone controller 61 issues a simultaneous calling request from the calling telephone TEL1 to the control line 5.
Is sent to the main device ME via. The main unit ME closes the switching circuits SW1 and SW5 and the crosspoint switches CX ³ _{2 to} CX ³ _n by the control unit 4 in response to a general call request from the calling telephone set TEL1. The called telephone TEL by閉結of the crosspoint switch CX ³ ₂ ~CX ³ _n
A current for calling is supplied from the power supply 3 to 2 to TELn. On the other hand, the telephone control devices 61 to 6n of the called telephones TEL2 to TELn, under the control of the control device 4 of the main device ME via the control line 5, receive the signal switching relays Sr2 to Sr2.
Srn is running. Therefore, the calling voice from the calling telephone set TEL1 is transmitted to all the called telephone sets TEL2 to TEL2 through the following route.
Speaker SP2 amplified by the TELn amplifiers B2 to Bn
Is output from SPn. When any one of the telephones TEL2 to TELn that received the call raises the handset and performs a response operation, the telephone control device 63 of the response telephone (TEL3 as an example).
Restores the signal switching relay Sr3. On the other hand the control unit 4 of the main device, all of the cross-point switch CX ³ ₂ -C
The current supply to the telephone TEL2~TELn opens the X ³ _n stopped, also閉結crosspoint switch CX ¹ ₃ Response phone TEL3. Then the calling telephone TEL1
And the answering telephone TEL3 are brought into an extension communication state by the following route. ^{NW1-Sr1-L1-CX 1} 1 -CX 1 3 -L3-Sr3-NW3

[Problems to be solved by the device]

In the conventional calling circuit, in order to make two extension calls at the same time, the extension must necessarily have two lines. Therefore, there is a drawback in that if an attempt is made to provide two extension lines, the number of circuit components will increase and the cost will increase. The present invention has been made in view of the above points, and an object of the present invention is to provide an inexpensive and reliable calling circuit for a telephone device which can eliminate the above-mentioned drawbacks with a simple circuit configuration.

[Means for Solving the Problems]

The present invention has the following configuration to achieve the above object. A telephone device in which a main unit and a plurality of telephones are connected by a call line and a control line, and when making an individual call, a service tone indicating that the call is permitted is supplied with a call current from a signal transmission circuit (CN1). After the call is sent to the extension telephone, the extension is sent from the extension to the calling telephone through the crosspoint switch, the voice call from the calling telephone is made to the telephone that is called through the closed crosspoint switch. In addition, when calling all by voice, after the service tone is sent to the calling telephone through the extension,
The voice signal from the calling telephone is an extension, and the signal transmission circuit (CN
1), the voice signal is sent to the general calling path via the switching circuit (SW1) and the low output impedance amplifier, and this voice signal is converted into a current from the power source connected to the general calling path via the switching circuit (SW5). Superimposed,
From the general calling path via a cross point switch,
In a calling circuit of a telephone device that calls multiple telephones simultaneously by voice, a simultaneous ringing path that can also be used as an extension, and an output side of a low output impedance amplifier that amplifies the voice signal from the calling telephone when calling by voice A switching circuit (SW6) which is normally conducted between the signal line and a signal sending circuit (CN) for supplying the service tone to the general ringing path.
3) and 3) are provided in the main device, and when an individual calling operation is performed when all the extensions are blocked, the control device of the main device captures the general calling path and switches the switching circuit ( SW6) is made non-conductive to disconnect the low output impedance amplifier from the general ringing path, and the service tone is called via the signal sending circuit (CN3), the general ringing path, and a cross point switch controlled to be closed. By sending the call to the telephone, the paging route can be used as an extension.

【Example】

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a block diagram of a telephone device relating to a calling circuit according to an embodiment of the present invention. SW6 is a switching circuit, CN3 is a signal sending circuit composed of a transformer, C4 is a capacitor, 3 is a power supply for supplying an extension call current and a DC current for superimposing ringing voice at the time of simultaneous ringing, and 7 is a cross point of the main device. The switches CX ^q _p (p is 1 to n, q is 1, 3), control devices for controlling the switching circuits SW1, SW3, SW5, SW6, etc., 81, ..., 8n are telephone control devices. In addition,
The same numbers and symbols as in FIG. 1 indicate the same parts. First, the operation of the calling circuit of the present invention will be described with reference to FIG. The extension ICM1 is captured from the telephone TEL1, and the telephone TE
Operation to call L2 individually and make extension call and telephone TE
The operation of calling all the telephones TEL2 to TELn from L1 and making an extension call with the responding telephone, for example, TEL3 is the same operation as the conventional example of FIG. Next, an operation for making an extension call after making an individual call by using the general calling path ALL will be described. When the telephone TEL1 is operated to individually call the telephone TEL2 by voice, for example, the telephone control device 81 sends an extension acquisition request from the calling telephone TEL1 to the main device ME via the control line 5. In the main device ME, the control device 7 which receives the extension acquisition request from the calling telephone set TEL1 detects whether or not the extension ICM1 is empty. If the extension ICM1 is captured by another telephone, it is detected whether the paging route ALL is empty. If the general calling path ALL is empty here, the crosspoint switch CX
³ ₁ and switching circuit SW5 are closed. When the above circuit is closed, the calling telephone TEL1 has a power supply 3-SW5-C.
A call current is supplied through the path X ³ ₁ -L ₁ -Sr ₁ -NW ₁ and a service tone (here, a dial tone) is generated by the service tone generating unit 1 and the service tone generating unit 1-CN3-C4-CX ³ The call current is superimposed on the path of _1- L1-Sr1-NW1 and transmitted to the telephone TEL1. At this time, the switching circuit SW6 is non-conductive, and the low output impedance amplifier A is disconnected from the general ringing path. Next, when the extension number of the telephone TEL2 at calling telephone TEL1 is dialed, the control unit 7 of the main device ME with stops sending the service tones and閉結crosspoint switch CX ³ _2. Supplying a speech current from the power source 3 to the telephone TEL2 This crosspoint switch CX ³ ₂閉結. On the other hand, since the telephone control device 82 of the called telephone TEL2 activates the signal switching relay Sr2, the calling voice from the calling telephone TEL1 follows the following path.
It is output from the speaker SP2 of EL2. ^{NW1-Sr1-L1-CX 3} 1 -CX 3 2 -L2-Sr2-B2-SP2 the call receiving sound handset of the called telephone TEL2 like, switching signals the telephone control unit 82 relays Sr2
Calling telephone TEL1 and called telephone TE to restore
An extension communication state is established with L2 on the next route. ^{NW1-Sr1-L1-CX 3} 1 -CX 3 2 -L2-Sr2-NW2 Similarly crosspoint switch CX ^{₃ 3} ~CX ³ _n even when calling phone other than telephone TEL2, on the phone that received the call Sr3 Control is performed to open / close the corresponding one of Srn. Similarly, telephone TEL1
A desired telephone can be called from a telephone other than the above. Further, when the signal is transmitted from the main device ME and the connection of the low output impedance amplifier A is required (for example, when the call signal from the intercom 2 is transmitted to a plurality of telephones), the call can be similarly made. The calling circuit of the telephone device of the present invention in FIG. 2 differs from the calling circuit of the conventional telephone device of FIG. 1 in that the extension (IC
M2) One line and extension ICM2 and call line L2 of each telephone
The cross point switch with ~ Ln has been reduced. However, a switching circuit SW6 is added to add the function of the extension to the general calling path ALL. When all the extensions are in the closed state, this SW is
6 is operated to disconnect the low output impedance amplifier A, which uses the general calling path ALL as an extension, from the general calling path ALL. Although there is no increase or decrease in the number of parts, instead of reducing the signal transmission circuit CN2 and the capacitor C2 connected to the extension ICM2 for transmitting the service tone, the signal transmission circuit CN3 is added to add the extension function to the paging circuit ALL. And the capacitor C4 was added.

[Effect of device]

As described above, according to the present invention, it is composed of a plurality of telephones and a main unit, and the main unit can use the paging call as an extension in addition to the normal paging call. However, even a small-scale telephone device having one pair and a pair of simultaneous ringing routes can only make a call for one extension line, but now it can make an extension call for two extension lines. In other words, since the paging route can function as an extension, it is possible to secure the number of extension lines that is equal to the number of mounted extension lines (usually 1). Therefore, if you want to secure the same number of extensions as the conventional device,
The number of extensions is small, the circuit configuration is simple, the equipment cost can be reduced, and the economical efficiency can be improved. Although one embodiment of the present invention has been described in the case of a small-sized key telephone device, the more efficient circuit configuration method using a small number of circuit components of the present invention has the same advantage even in a large-sized key telephone device. .

[Brief description of drawings]

FIG. 1 is a block diagram of a small-sized telephone device (here, two extension lines) related to a conventional calling circuit.

FIG. 2 is a block diagram of a telephone device relating to a calling circuit according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Service tone generator 2 ... doorphone 3 ... power supply 4 ... control device 5 ... control line 61, ..., 6n ... telephone control device 7 ... control device 81, ..., 8n ... telephone control device ME ...... main unit TEL1, ..., TELn ...... telephone Sr1, ..., Srn ...... signal switching relay NW1, ..., NWn ...... telephone speech circuit CX ^q _p (p is 1 to n, q is 1 to 3) ... ... Cross point switch SW1, ..., SW6 ... Switching circuit CN1, ..., CN3 ... Signal sending circuit A ... Low output impedus amplifier L1, ..., Ln ... A pair of communication lines B1, ..., Bn ... Telephone amplifiers SP1, ..., SPn ... Speakers ICM1, ICM2 ... A pair of extensions ALL ... A pair of simultaneous ringing paths

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 999999999 Daiko Denki Seisakusho Co., Ltd. 6-10-13 Nakanobu, Shinagawa-ku, Tokyo (72) Creator Ken Kudo 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone public office (72) Inventor Nobuo Kobayashi 1-741 Kugayama, Suginami-ku, Tokyo Iwasaki Communications Co., Ltd. (72) Inventor ▲ Ashi ▼ Yoshiki Kayo 2-40-2 Daisawa, Setagaya-ku, Tokyo Stocks Company Nakayo Tsushinki (72) Inventor Yasushi Oi 260 Kitamikata, Takatsu-ku, Kawasaki City, Kanagawa Nihon Telecommunications Industry Co., Ltd. (72) Morio Takiguchi Nakanobu 6-1013, Shinagawa-ku, Tokyo Daikai Co., Ltd. Electric Manufacturing Co., Ltd. (72) Inventor Takanori Ozawa 2-23-2 Nishigotanda, Shinagawa-ku, Tokyo Kanda Communication Industry Co., Ltd. Masanori Judge, Kohei Hirooka Judge, Mitsutake Fujiuchi

Claims (1)

[Scope of utility model registration request] 1. A telephone device having a control device for each of a main device and a telephone, wherein the main device and a plurality of telephones are connected by a call line and a control line. The indicated service tone is sent to the extension to which the call current is supplied from the signal transmission circuit (CN1) and further from the extension to the calling telephone through the crosspoint switch, and then the voice call from the calling telephone is closed. Calls are made to telephones that have been called via the crosspoint switch, and when calling by voice,
After the service tone is sent to the calling telephone through the extension, the voice signal from the calling telephone is sent to the general calling path through the extension, the signal sending circuit (CN1), the switching circuit (SW1) and the low output impedance amplifier. At the same time, the voice signal is superposed on the current from the power source connected to the paging path through the switching circuit (SW5), and a plurality of voice signals are simultaneously broadcast from the paging path through the crosspoint switch. In the ringing circuit of the telephone device that calls the telephone of the telephone, there is a normal line between the simultaneous ringing path that can also be used as an extension and the output side of the low output impedance amplifier that amplifies the voice signal from the calling telephone when calling by voice. A switching circuit (SW6) which is turned on at a time, and a signal transmission circuit (CN) for supplying the service tone to the general ringing path.
3) and 3) are provided in the main device, and when an individual calling operation is performed when all the extensions are blocked, the control device of the main device captures the general calling path and switches the switching circuit ( SW6) is made non-conductive to disconnect the low output impedance amplifier from the general ringing path, and the service tone is called via the signal sending circuit (CN3), the general ringing path, and a cross point switch controlled to be closed. A calling circuit for a telephone device, wherein the paging circuit can be used also as an extension by being sent to a telephone.