JPH033019Y2 - - Google Patents

Description

[Detailed Description of the Invention] Field of the Invention The present invention relates to an additional device for transmitting hold music, and more specifically, the present invention relates to an additional device for transmitting hold music, and more specifically, it transmits hold music such as electronic music box sound to a telephone line and puts it on hold without using an external power source. , relates to an additional device for a telephone that can perform transfer.

BACKGROUND ART Conventionally, private branch exchanges, key telephone devices, and other telephone terminal devices have been provided with a function of placing a telephone subscriber's line on hold in order to receive an incoming call and transfer it to an extension subscriber. In this case, the telephone line is put on hold by inserting a holding resistor between the connection terminals L1 and L2 with the telephone line. There is also a special function that sends hold music to the telephone line, but this requires commercial power.

On the other hand, stand-alone phones usually do not have a hold function, so after making or receiving a call, it is necessary to disconnect the handset and put the phone line on hold, but the other party can hear surrounding conversations and noise. Except for very short periods of time, it is necessary to call again.

In addition, in the conventional parent-child phone (branch phone),
It also does not have a hold function, so if you want to transfer a call after making or receiving a call, listen for the tone of the switch on the phone and confirm that the other handset has been turned off, then switch the other handset off. It is extremely inconvenient as you have to go to the airport to check it out.

Furthermore, even stand-alone wall-mounted telephones do not have a hold function, so if you need to leave your desk in the middle of a call, you must leave the handset in the lowered position. It is inconvenient because there is no place to hang it.

Purpose of the invention The purpose of the present invention is to eliminate these inconveniences by sending hold music to the telephone line, putting it on hold, and automatically releasing it without using an external power supply, so that it can be used on stand-alone telephones, parent-child telephones, To provide an additional device for transmitting hold music that can be easily and conveniently operated for a wall-mounted telephone or the like.

Summary of the invention In order to achieve the above object, the additional device for transmitting hold music of the present invention disconnects the call circuit section from the subscriber line by pressing the hold button during a call, and activates the hold relay using the call current. The circuit that operates and self-maintains and sends the hold tone to the subscriber line regardless of the on/off state of the hold switch, and the call current level decreases when one of the parent and child telephones is turned off, and the hold relay is activated. It is characterized by having a hold release circuit that restores the hold relay and releases the hold when the level falls below the emotional level.

Embodiment of the invention The figure is a configuration diagram of an additional device for transmitting held music showing an embodiment of the invention.

The part inside the dotted line in the figure is the additional device 2 for transmitting hold music of the present invention, which is added to the 601A telephone.
A case is shown in which the connection is made between the subscriber line and the communication circuit section 1. In the figure, L1 and L2 are subscriber line terminals on the telephone terminal, 3 is a relay contact provided in parallel to the switch (built into the additional device 2), B is a bell circuit, Di is a dial switch,
HS1 and HS2 are switch switches, 21 is a hold tone sending unit, PT is a transformer, SW1 is a hold release button switch, SW2a and SW2b are hold button switches, LED1 is a light emitting diode, T1, T
2, T3 is the transistor that controls the relay, H is the relay, SCR1 is the silicon controlled rectifier, UJT
1 is a unidirectional transistor, VR1
is a variable resistor, h1 and h2 are contacts of relay H, and D
1 to D4 are polarity reversal current rectifier diodes.

In the figure, since the transmission to and reception of calls from the station is the same as in the conventional case, the explanation will be omitted.

Next, when you want to put the music on hold, the operation of sending out a hold sound such as an electronic music box sound will be explained.

First, by pressing the hold button SW2 (non-lock switch), the contact SW2a turns off and the contact
SW2b turns on. When the SW2a contact turns off, the communication circuit section 1 is disconnected, but the SW2a contact is turned off.
When the 2b contact turns on, a station line loop is formed within the additional device 2, and the H relay operates in the next circuit. That is, L1-Di-D1-SW2b-
Since a high level voltage is applied to the base of the transistor T1 through the path R3-T1, the transistor T1 is turned on.

L1−Di−D1−SW2b−D6−R2(PT)−D8, D9
(21) -H-T1-D4-HS1-L2...(1) By forming the loop of the above formula (1), the electronic music box sound etc. is transmitted from the output terminal OUT.P of the held music sending section 21 to the dial Di. , diode D1, contact h1, resistor R8, diode D6, transformer P.
T, diode D8, D9, H relay transistor T1, diode D4, contact h2 or HS1
The signal is then sent to the central office line. This allows the other party to know that an internal transfer or a call to the target person is in progress.

By operating the H relay, contact h1 becomes C.
On the other hand, the contact h2 switches to the E side. hold button
Since SW2 is a non-lock switch, if you stop pressing it at this time, contacts SW2a and SW2b will return to their original state, but since contact h1 has been switched, communication circuit 1 remains disconnected, and contact h2 has switched. Therefore, even if the switch HS1 and HS2 in the handset are turned off, the H relay in the additional device 2 is self-maintained in the next path. That is, L1-Di-D1-h1(ac)-R8-R
Since a high level voltage is applied to the base of the transistor T2 through the path 1-T2, T2 is turned on.

L1−Di−D1−h1(a−c)−R8−D6−R2(P.
T)-21(D8,D9)-H-T2-D4-h2(E-D),
(HS1)-L2...(2) The holding tone continues to be sent out by the self-holding circuit in (2) above. While the H relay is operating, the light emitting diode LED1 lights up, and the subscriber knows at a glance that the hold tone is being transmitted. The subscriber must hang up the handset and turn the phone switch while the hold tone is being transmitted.
There is no problem even if HS1 and HS2 are turned off.

Next, the operation when canceling hold and hold music transmission will be explained.

First, when the subscriber presses the hold release button SW1 (non-lock switch) and the switch SW1 is turned on, the H relay is released from hold. That is, L1-Di-D1-h(a-c)
-Transistor T in the path of SW1-D11-T3
Since a high level voltage is applied to the base of 3,
T3 is turned on, and as a result, the base voltage of transistor T2 becomes low level, so T2 is turned off.
As a result, the H relay is restored and the held tone sending section 2
1 stops, and at the same time, the light emitting diode LED1 turns off. Due to the restoration of H relay, contact h1 becomes a-
Since the contact SW2a of the hold button is turned on, a central office line loop is formed in the telephone call circuit section 1, and a telephone call is possible.

In addition, while the H relay is operating, press the hold release button.
When SW1 is pressed, a station line loop is also formed in the communication circuit section 1 by the following circuit.

L1−Di−D1−h1(a−c)−SW1−D5−SW2a
-Speech circuit section 1-D4-h2-(E-D), (HS1)-
L2...(3) The above operation is for manually releasing the hold, but the hold may be automatically forcibly released as shown below.

One is when the hold is automatically released if it continues for a certain period of time, which is to prevent misuse of the hold. This is a case in which when one of the telephones (telephones) raises the handset, the hold is automatically released and the call state is established.

The former hold forced release circuit includes capacitor C2,
It consists of a unijunction transistor UJT1 and a silicon controlled rectifier SCR1.

While on hold, H relay operates and contact h1 (a-
c), h2(E-D), so L1-
Di-D1-h1(a-c)-R8-R-VR1-
A charging current flows through the capacitor C2 through the path C2-D4-h2(D-E)-L2. At a preset time, the charge voltage reaches a constant value and turns on the unijunction transistor UJT1. When the transistor UJT1 is turned on, a current flows through the gate circuit of the silicon-controlled rectifier SCR1, turning on SCR1, so that a high-level voltage is applied to the base of the transistor T3. As a result, the base voltage of the transistor T2 becomes low level, so the transistor T2 is turned off and the H relay is restored. The setting of this hold release time is determined by the value of capacitor _C2 and VR1. When the H relay is restored, the contact h1 returns to (a-b) and h2 returns to (D-F), the hold is released, and the transmission of the hold sound (electronic music box sound, etc.) is stopped. In this case, when the handset is switched on, the system is in a state of waiting for an outgoing or incoming call, and when the handset is left off, a central office line loop is formed by the communication circuit section 1.

Note that when the hold forced release circuit is not required, R
By replacing the element with an S element, this circuit ceases to operate. That is, even if the caller is not forcibly released from hold, the station can detect that the handset has been taken off the hook, and can be notified by a howler sound or the like.

Next, the operation of the hold release circuit due to a drop in station line current will be explained.

For example, in a parent-child telephone, the parent telephone and the slave telephone are always connected to a branch, and the telephone circuit is inserted in parallel to the subscriber line, so if either one of the handsets is lifted from the switch, A resistor will be connected in parallel to the relay. Therefore, in the hold state, the station line current flowing through the H relay decreases, so the H relay is restored. Therefore, the following circuit is formed, and the telephone set with the handset raised becomes ready for making calls, and the other telephone set stands by for making and receiving calls.

Next, the automatic current adjustment operation circuit of the H relay will be explained.

The telephone line DC current varies depending on the subscriber line resistance; the longer the distance from the office to the telephone terminal, the greater the resistance, and the shorter the distance, the lower the resistance. Furthermore, when this device is attached to the extension line of a private branch exchange, the line resistance is zero. When the line resistance is small, the DC terminal voltage of the H relay becomes large, so the Zener diode D12 becomes conductive, and the resistor R7 is inserted in parallel with the H relay. As a result, the station line current is shunted to the H relay, diode D10, and resistor R7, and the DC terminal voltage of the H relay is suppressed to a specified value or less.

The device of the present invention can be applied to all individual telephones, and when combined with a switch, can also hold a subscriber's line and switch it to another.

Further, by forming the device of the present invention into a single molded circuit or IC, it is possible to downsize the device.

Furthermore, if a telephone equipped with the device of the present invention is used as a parent/child telephone (branch), one telephone can be put on hold, the handset is on, and the other telephone can be put on hold by raising the handset. It is released and you can talk, and even 3-party calls are possible.

Furthermore, when the device of the present invention is added to a stand-alone telephone, the telephone call circuit is disconnected by putting the telephone on hold, so that the other party cannot hear surrounding voices.

Effects of the Invention As described above, according to the present invention, it is possible to send hold music, such as an electronic music box tone, to the telephone line using telephone current to put the call on hold, and there is no need to use an external power source. In addition, in the case of a parent-child phone, you can transfer the call to another phone without confirming that you have lifted the handset, and in the case of a wall-mounted phone, you can put the handset on hold by pressing the switch. It is also desirable from an aesthetic point of view. Furthermore, by using the hold forced release circuit element, the hold is forcibly canceled after a certain period of time has elapsed, and the call is put into a call standby state, so that misuse of the hold can be prevented.

[Brief explanation of drawings]

The figure is a configuration diagram of an additional device for transmitting held music according to an embodiment of the present invention. 1: Call circuit section, 2: Additional device for transmitting hold tone,
3: Relay contact part built into the additional device, L1,
L2: subscriber terminal, HS1, HS2: box switch, 21: hold tone sending unit, SW1: hold release button switch, SW2a, SW2b: hold button switch.

Claims (1)

[Scope of utility model registration request] In an additional device for transmitting hold tone that is inserted between a call circuit and a subscriber line and has a hold button, a button for canceling hold, and a hold relay, during a call, when the hold button is pressed, the call circuit is connected to the subscriber line. one of the parent and child telephones; Due to the hook-off, the level of call current decreases,
An additional device for transmitting held music, comprising: a holding release circuit that restores the holding relay and releases the holding when the emotional level of the holding relay becomes lower than the emotional level of the holding relay.