JPH0733479Y2 - Pink telephone switching device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a pink telephone and a general telephone (hereinafter referred to as a slave telephone) on a line (hereinafter referred to as an outside line) which receives a signal transmission function such as coin storage of one line. It is related to a pink telephone switching device that is used by switching each other.

[Conventional technology]

In the conventional pink telephone switching device, an incoming call from an outside line and an outgoing call to an outside line can be made with a pink telephone or a slave telephone to communicate with the outside line.

However, when the pink telephone transfers to the sub-phone during a call with an outside line, only the verbal contact to the sub-phone and the off-hook switching of the sub-phone can be performed.

In addition, an extension call from a pink phone to a child phone cannot be made without inserting a coin from the coin slot provided on the pink phone, and even if a coin is inserted and a dial tone is heard and a call becomes possible. Pink phones have not been solved yet because there are problems such as not being able to talk unless the coin storage signal comes from the extension.

In other words, when making a call to an outside line from a pink telephone, it is configured so that an outside line loop is not formed unless a coin is inserted, so by inserting a coin to form an outside line loop, the dial tone can be heard from the outside line. , When the other party responds by dialing, the polarities of the external line terminals L1 and L2 are reversed, so that a call between the pink telephone and the external line becomes possible, and coins are stored by the charging pulse from the external line.

If the polarities of the external line terminals L1 and L2 are not reversed, the call current does not flow to the pink telephone, and the call with the external line cannot be performed.

Also, in the case of an incoming call from an outside line, a call can be made off-hook on a pink telephone without using coins.

[Problems to be solved by the device]

In order to solve the drawbacks of the prior art, the present invention provides a call button for pink telephones in this device, so that not only telephone calls between an outside line and a pink telephone or a slave telephone but also transfer between a pink telephone and a slave telephone and extension mutual call can be performed. The present invention provides a very useful pink telephone switching device that can be used.

The device of the present invention does not use an inversion polarity reversal circuit (reverse circuit) when carrying out extension mutual call, and the switching circuit can be inexpensively constructed by lowering the loop voltage of the call circuit below the station voltage. Is.

[Means for Solving the Problems]

The configuration of the present invention will be described below with reference to the block diagram of the pink telephone switching device shown in FIG.
Is an external line terminal, CPU is a microprocessor, 2 is an incoming call detection circuit for detecting an incoming call from an external line, 3 is a call button for a child phone, 4 is a DC loop circuit, 5 is a speech path switch connected through a transformer T, 6 is a signal device for listening to various sounds to the telephone, 7 is an off-hook detector for the pink telephone, 8 is an oscillator for ringing the telephone bell, 9 is an off-hook detector for the slave telephone, and LPF is a music on hold filter Is.

As is clear from the block diagram shown in FIG. 1, these are connected to the microprocessor CPU by control lines. TL1 and TL2 are terminals of pink telephones, and TL3 and TL4 are terminals of slave telephones.

[Operation and Example]

 Hereinafter, the operation of the present invention will be described in detail with reference to FIG.

If there is an incoming call from the outside line, the outside line incoming detection circuit 2 detects that there is an incoming call, and the phototriacs PT1 and PT2 are turned on by the microprocessor CPU. Therefore, the oscillator 8 sends a ringing signal to the pink telephone TEL1 and the slave telephone TEL2. Send (eg 16Hz or 20Hz) and ring the bells on both phones. Here, when the pink telephone TEL1 goes off-hook, the telephone loop detector 7 detects a response. As a result, the relay EX1 is operated, and its contact ex1 is switched to connect the outside line and the pink telephone TEL1.

When transferring from the pink telephone TEL1 to the slave telephone TEL2 in this state, first, the call button 3 provided in the present apparatus is pressed. Pressing call button 3 activates relay B,
The DC loop circuit 4 closes the DC loop of the outside line to hold the outside line, and the microprocessor CPU crosses the filter LPF and the communication path switch 5 (d).
By transmitting a holding sound to the outside line via the transformer T and disconnecting the extension line at the contact b, the extension line and the outside line form a confidential circuit. Next, the microprocessor CPU restores the relay EX1, turns on the crosspoint (a) of the speech path switch 5, and causes the pink telephone TEL1 to hear the ringing tone of the traffic light 6. At the same time, in the slave telephone TEL1, the phototriac PT2 is turned on by the microprocessor CPU, and a ringing signal is sent from the oscillator 8 to ring the bell. Sub-phone TEL2
When is off-hook, the telephone loop detector 9 detects a response. Turn off the cross point (a) of the call path switch 5.
If you turn on the crosspoints (b) and (c), you can talk between the pink phone TEL1 and the slave phone TEL2.

Next, when pink phone TEL1 goes on hook, relay EX2
Then, Lerry B is operated to connect the outside line and the sub-phone TEL2 and the transfer is completed.

To make an extension mutual call between the pink telephone TEL1 and the slave telephone TEL2, first press the call button 3. When the call button 3 is pressed, the photo triac PT1 is turned on from the microprocessor CPU, a call signal is sent from the oscillator 8, and the bell of the pink telephone TEL1 rings. Pink phone TEL1
When the telephone goes off-hook, the telephone loop detector 7 detects a response, and the microprocessor CPU causes the phototriac P
Since T1 is turned off, the ringing of the pink telephone TEL1 bell stops. The cross point (a) of the call path switch 5 is ON
Then, use the signal device 6 to hear the ringing tone on the pink telephone TEL1. At the same time, the microprocessor CPU turns on the phototriac PT2, and a calling signal is sent by the transmitter 8 to ring the bell of the slave telephone TEL2. When the slave telephone TEL2 goes off-hook, the telephone loop detector 9 detects a response, turns off the crosspoint (a) and turns on the crosspoints (b) and (c) of the speech path switch 5. This allows extension telephone calls between the pink telephone TEL1 and the slave telephone TEL2.

[Effect of device]

According to the present invention having the above configuration, the following great effects are obtained.

(1) A call can be made from a pink telephone to a slave telephone without inserting a coin and without making a signal having characteristics such as a coin storage signal.

(2) In addition to the outside line calling function, the transfer with the confidential communication function was realized from any telephone. That is, a hold tone is sent to the outside line when the outside line is transferred, and a call can be made between the pink phone and the slave phone.

[Brief description of drawings]

FIG. 1 is a block diagram of the device of the present invention, and FIG. 2 is a schematic connection configuration diagram of the device of the present invention. CPU is a microprocessor, 2 is an outside line incoming detection circuit, 3
Is a call button, 4 is a DC loop circuit, 5 is a speech path switch, 6 is a signal device, 7 and 9 are telephone loop detectors, 8
Is an oscillator. LPF is a filter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimitoshi Nakamura 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Fumihiro Kojima 3-18 Kamami, Setagaya-ku, Tokyo No. 7 Takamizawa Denki Seisakusho Co., Ltd. Examiner Naoyuki Yagami (56) References JP-A-52-138808 (JP, A) JP-A-62-31242 (JP, A) JP-A-51-101401 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A pink telephone switching device in which a pink telephone and a general telephone (slave telephone) are connected to a line that receives a signal transmission function such as coin storage of one line, and the pink telephone is switched to each other. When the device is provided with a call button for calling the sub-phone, and when the sub-phone is called from the pink phone to perform extension mutual call with the sub-phone,
Pushing the call button activates a traffic light via the microprocessor CPU to ring the bell of the pink phone, and then automatically rings the bell of the slave phone after the ringing state of the pink phone is set to the incoming state. , Pink telephone switching device, which allows extension telephone calls to be made without inserting coins by off-hook of a slave telephone.