JPS60163554A - Electronic tone melody converter of telephone ring signal - Google Patents

Abstract

PURPOSE:To feel a ring tone of a telephone set pleasant to the auditory sense without causing any sense of irritation by controlling a melody unit circuit during talking so as to transmit an electronic tone melody to the own telephone set and the opposite telephone set. CONSTITUTION:A handset state detecting circuit 3 is inserted on the way of a telephone line L from an exchange to the own telephone set 2, and a ring tone detecting circuit 4 is connected to the line L in parallel with the circuit 3. The melody ringing control circuit inactivated by the handset hook-off confirmation of the circuit 3 in response to the call signal detection of the circuit 4 is provided and a melody unit circuit 6 produces an electronic tone melody in response to the operation of the circuit 5. The circuit 6 is controlled during talking so as to transmit the produced melody to the telephone set and the opposite telephone set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used in the field of audible ringing signals arriving at a telephone. That is, the present invention relates to an improvement in a device for converting a calling signal arriving at a telephone into an electronic melody.

By the way, when calling a telephone placed on the called party's side, a low-frequency intermittent current of 16 Hz, on for 1 second and off for 2 seconds, is normally used as a ringing signal, and the alternating current bell built into the telephone or this is used as a ringing signal. A similar device is made to repeatedly and intermittently ring with that signal.

However, the mechanical noise emitted from the above-mentioned AC bells etc. is quite irritating to the sense of hearing, so although it can usually be tolerated, it is particularly important for medical work and service work where a non-irritating environment is desired. This is extremely undesirable in the field of relationships.

Therefore, as a countermeasure to this problem, it has been widely practiced to soften the sound quality of the above-mentioned mechanical noise as much as possible, and has achieved some success.

However, as long as the same sound is repeated intermittently, it is still irritating or harsh, and is not a practical solution.

In order to deal with this situation, the patent application of the present invention has proposed an apparatus for converting a call signal into an electronic melody. In other words, this proposal is based on the idea that it is more pleasant and less irritating to the auditory senses to play a variety of electronic sounds with different gradations as a melody, rather than repeating the same tone intermittently. Based on.

However, this advance proposal does not have an unreasonable circuit configuration and requires changes to the internal wiring of the telephone, making it troublesome to add to an existing telephone, and also making it impossible to leave the AC bell built into the telephone. Therefore, as a countermeasure against a power outage of the power supply dedicated to the device, problems remain, such as the need to separately prepare a calling sound source such as a buzzer that responds to the calling signal.

The technical problem of the present invention under the current situation is as follows:
This is a device that converts incoming call signals into electronic melodies, and can be added externally or built-in to an existing telephone by simply changing the connection in the rosette without requiring any changes to the internal wiring of the existing telephone. This can be easily realized, and the AC bell built into this off-the-shelf telephone can be left in place, allowing the bell to be used as a ringing device in the event of a voltage drop or power outage of the dedicated power supply. Furthermore, to the off-the-shelf telephone and the telephone of the other party who is talking with it,
The object of the present invention is to provide a device that can transmit the same electronic tone melody converted from a call signal as a hold tone.

As shown in FIG. 1, the technical means of the present invention that addresses such technical problems targets the telephone Ia2, which is normally directly connected to the telephone line (L) from the exchange via the rosette 1. a handset status detection circuit 3 of the telephone interposed in the middle of the telephone line (L) leading to the telephone fi2;
A ringing signal detection circuit 4 is connected to the telephone line (L) in parallel with this circuit 3, a melody play control circuit 5 is connected to both of these circuits 3 and 4, and It consists of a melody unit circuit 6 and a hold tone sending circuit 7 connected to this circuit 6 and the handset status detection circuit 3, and a DC power supply circuit 8 is provided for the circuits 3, 5.6.

The above-mentioned handset status detection circuit 3 has a state in which the connection between the telephone set 2 and the telephone line (L) is cut off when the handset of the telephone set is hung, and also when a call is made or received. It also has a function to switch to a connection state when the handset is disconnected, and a function to simultaneously stop the operation of the melody-sounding control circuit 5 when the handset is disconnected when a call is received. A function has been added to switch the telephone set 2 to a state where it is connected to the telephone line (L) even if the handset is hung up when the supply voltage from the circuit 8 falls below a permissible value.

In addition, the ringing signal detection circuit 4 has a function of rectifying and outputting the 1 second contact part of the ringing signal that arrives at a frequency of 16 Hz, and eliminates the influence of external abnormal currents other than the ringing signal, such as dial impulses when making a call. Then the melody
A function to prevent malfunction of the sound control circuit 5 is provided.

Next, the melody-sounding control circuit 5 is equipped with a function to convert the driving output, which is an intermittent direct current, from the calling signal detection circuit 4 into a stable continuous output and send out the melody. - The unit circuit 6 is equipped with a function of playing an electronic sound melody in response to the continuous DC drive output given from the control circuit 5.

On the other hand, the hold tone sending circuit 7 has a function to operate the melody unit circuit 6 at any time regardless of the melody play control circuit 5 when the telephone 2 is in a call state, and a function to operate the melody unit circuit 6 at any time regardless of the melody play control circuit 5, and to output the electronic sound melody at this time. It is equipped with the above-mentioned telephone set 2 and a function of transmitting to the telephone line (L).

According to the technical means of the present invention, the following effects can be expected.

First, the conversion device of the present invention based on this technical means is
Usually, it is used by being inserted between the telephone set and the rosette 1 to which the telephone set 2 is connected.

The device therefore connects the telephone line (
Even for an existing telephone connected to L), by simply replacing the connection with the rosette, it can be easily added to the telephone either externally or built-in, and can be used immediately. Moreover, the ready-made telephone does not require any changes to the internal wiring, and the built-in AC bell can be left in a state where it can be used at any time.

In addition, with this technical means, when a ringing signal arrives at the called party with the handset of the telephone set 2 hung up, the ringing signal detection circuit 4 detects this signal without inputting it to the telephone set 2. , the melody is played by the melody control circuit 5.
By operating the unit circuit 6, the calling signal can be converted into an aurally pleasing electronic sound melody and played, so that the surrounding environment is not unnecessarily stimulated when the signal arrives.

Furthermore, with this technical means, when the handset of the telephone 2 is removed, the telephone can be automatically switched to a state in which the telephone is connected to the telephone line (L), and when a call is received, an electronic tone melody based on the arrival of a ringing signal is played. It is possible to simultaneously stop the sound of the melody and prevent the above-mentioned melody from being erroneously played due to an external abnormal current such as a dial impulse when making a call, so that the telephone 2 can be handled in the same way as before when making or receiving a call. Other than that, no special operations are required.

In addition, with this technical means, when the telephone 2 is in a call state, the same electronic tone melody converted from the ringing signal is transmitted to the telephone 2 and the other party connected to it via the telephone line (L). Since it can be sent to a telephone, even an off-the-shelf telephone that does not have a hold tone sending function can be easily provided with this function.

However, with this technical means, when the voltage supplied from the dedicated DC power supply circuit 8 drops below the permissible value, even if the handset of the telephone 2 is hung, the telephone is disconnected from the telephone line (L).
Since the DC power supply circuit 8 can be automatically switched to a state where it is connected to a battery, it is possible to reduce battery consumption when the DC power supply circuit 8 uses a battery, or reduce the power consumption when the DC power supply circuit 8 uses a step-down rectified commercial AC power. Even in the event of a power outage, the calling and receiving functions of the telephone 2 will not be affected in any way, except that it will no longer be possible to play the electronic melody and send out the hold tone when a calling signal arrives; When a calling signal arrives, the telephone bell that remains built into the telephone 2 can ring to notify the arrival of the signal, as in the past, and at the same time, this reduces battery consumption. It is also possible to notify of a power outage of commercial AC power.

Next, a specific embodiment of the above-mentioned conversion device according to the present invention will be described with reference to FIG. However, in this FIG. 2, the parts corresponding to each block in FIG.
), and the hold tone sending circuit 7 is shown divided into sections 71 and 72. The device according to this embodiment also includes a terminal plate 9 and a cutting device 10.

First, the telephone lines (Ll) and (L2) are connected to the terminals LLI' and Ll2 of the terminal board 9 via the rosette 1, and the telephone line 2 that would normally be connected to the rosette.
are connected to the terminals TLI and TL2 of the same terminal board 9, and the former's telephone line (Ll
), (L2) are connected to the handset status detection circuit 3 and the ringing signal detection circuit 4, and the latter telephone [2 is connected only to the handset status detection circuit 3.

The handset status detection circuit 3 includes a latching type relay 31 that switches between the disconnection state and the connection state between the telephone set 2 and the telephone lines (Ll) and (L2), and this relay has a Each of the following coils ^1. In addition to having two sets of switching contacts al and a2 which are operated by A2 and both of the coils, this embodiment also has two sets of contacts a3+84 which are interlocked with both of these contacts. In addition, in this circuit 3, in connection with the above-mentioned latching type relay 31, a switching contact a of the relay is connected from a DC power source E through a resistor R1.
There is a handset/receiver removal detection section 32 that reaches the L side and goes from the switching contact 82 side to the next stage via a resistor R2 and a capacitor C1, and a diode D1 that serves as a discharge path for the capacitor C1.
, a Zener diode zD1 and a capacitor C2 that absorb overvoltage due to capacitor discharge from the telephone 2 after a call ends. A transistor T is connected between this detection unit 32 and the primary coil A1 of the relay 31
There is an amplification section 33 using a Darlington circuit consisting of RI and TR2, and includes a resistor R3 for stabilizing the base potential of the transistor TRI.

Furthermore, four diodes D2. D3. D4. A diode bridge consisting of D5 is inserted as a call state detection section 34,
A photocoupler light emitting element PCa is connected to this. The light-receiving element PCb of this photocoupler is connected to the transmitter/receiver hook from the DC power source E through the resistors R4 and R5 and the capacitor C3 to the next stage, and to the detection section 35.
It is also connected to the melody-sounding control circuit 5. The detection section 35 is also equipped with a capacitor C4 that absorbs the transient current caused by the disconnection of the coupler light receiving element pcb, and a diode D6 that serves as a discharge bypass for the capacitor C3. Between the detection section 35 and the secondary coil A2 of the relay 31, there is an amplification section 36 using a Darlington circuit consisting of transistors TR3 and TR4, and includes a resistor R6 for stabilizing the base potential of the transistor TR3.

In addition, this circuit 3 is connected to the transistor T of the amplification section 33 from the DC power supply E through the resistor R7 and the diode D7.
There is a voltage drop detection section 37 leading to RI, and a lambda type negative resistance element is used as the diode D7.

On the other hand, in order to rectify and extract the 1-second contact part from the calling signal, which is a low frequency intermittent current, the calling signal detection circuit 4
diodes DB, D9.010. A diode bridge consisting of Dll is provided as the rectifying section 41, and the input side of this is connected to the telephone line (Ll
) side, and is also connected to the telephone line (L2) side via a capacitor C6. In addition, a protection section 42 consisting of a Zener diode ZD2 and a capacitor C7 is connected to the output side of the rectification section 41 in order to protect against intrusion of external abnormal current.

In addition, the melody sound control circuit 5 is connected to a capacitor C8 from a DC power source E via a resistor R8 and a transistor TR5.
There is a converting section 51 leading to the converter 51, and a stabilizing section 52 connected to the output side of the converting section 51, and the output side of the converting section 51 is connected to the photocoupler light receiving element PC of the above-mentioned handset status detection circuit 3.
b is also connected via a diode 012. The above-mentioned stabilizing section 52 includes resistors R9 to R to the DC power supply E.
Transistors TR6 and TR7 connected via IO,
A resistor R11 and a capacitor C9 inserted between both transistors, and an emitter resistor R common to both transistors.
A Schmitt trigger circuit consisting of 12 is used, and a variable resistor VR is inserted between the converter 51 and the converter 51 to adjust the discharge current of the capacitor C8. An amplifier section 53 using a Darlington circuit consisting of transistors TR8 and TR9 is connected to the output side of the stabilizing section 52, and a current limiting resistor R13 is connected between both of them 52 and 53.
is inserted. Note that each of the above transistors TR5~
TR8 are both base potential stabilizing resistors R14 and R1.
5°RlB to R17.

Next, the melody unit circuit 6 includes a melody signal generating section 61 consisting of an electronic sound melody integrated circuit IC, resistors R1B and R19, and a capacitor CIO.
On the output side of this, transistor TRl0. An amplifier section 62 using a Darlington circuit made of TRII and a speaker SPK as a sound generator are connected.

Note that this circuit 6 is connected to other circuits using a pin jack terminal P.
1. P2. P3. P4 is adopted.

Furthermore, the manual operation section 71 of the held music sending circuit 7 has a set of operating contacts RS and a light emitting diode LED in series therewith. This operating contact RS is grounded at one end, and the other end is connected between the melody sound control circuit 5 and the melody unit circuit 6 via the switching contact a4 of the launching type relay 31 from the light emitting diode LED. The latter 6 is connected so that it can be operated at any time regardless of the current state of the latter 6. Also, the melody signal sending section 72 of this circuit 7 has a capacitor C.
11, C12 and a transformer T, the input side of which is connected to the bin jack terminal P3 of the melody unit circuit 6. P4
to the melody signal generator 61, and the output side is the telephone 2.
and the handset status detection circuit 3, respectively.

The DC power supply circuit 8 outputs DC power of 10 E volts, and although battery B is used in the illustrated example, it may also be used by step-down rectifying commercial AC power. In any case, this circuit 8 includes a capacitor C13 as a temporary emergency power source when the battery is removed or when the commercial AC power is cut off.

Further, the rated voltage of the electronic sound melody integrated circuit IC in the above-mentioned melody unit circuit 6 is generally lower than the voltage of the above-mentioned DC power supply E, and the current value flowing through the circuit varies depending on the pitch of the electronic sound melody being played. It fluctuates according to the change in impedance caused by the change in impedance. Therefore, on the input side of this circuit 6, in order to apply a voltage corresponding to the above-mentioned rated voltage between the pin jack terminals PI and P2, an adjustment section 81 consisting of a Zener diode ZD3 and a capacitor C14 is installed.
is inserted.

In the embodiment of the present invention configured as described above, if the handset of the telephone fi2 is now connected and the DC power source E is maintained at a predetermined voltage, the latching type in the handset status detection circuit 3 is Each switching contact 81 to a4 of the relay 31 is in the illustrated state.

At this time, 16
When a Hz ringing signal that is on for 1 second and off for 2 seconds arrives, this signal is not received because the telephone 2 is maintained in a state where it is cut off from the line by the switching contacts al and a2 of the latching type relay 31. It does not reach the telephone and does not ring the AC bell built into it.

Therefore, this calling signal is transmitted to switching contact a3 of the relay 31.
When the signal is in the illustrated state, the signal reaches only the calling signal detection circuit 4. Then, the 1 second contact portion of this calling signal passes through capacitors C5 and C6 and is rectified by the rectifier 41.
The noise component is removed by the capacitor c7 of the protection unit 42,
It is output from Zener diode ZD2.

The above output current is applied to the base of the transistor TR5 in the conversion section 51 of the melody/sound control circuit 5, and is a current flowing from the DC power supply E through the resistor R8 and the transistor TR5 in order to make the transistor conductive. Capacitor C8 is charged. This capacitor C8
Since the photocoupler light receiving element PCb in the handset state detection circuit 3 is not conducting at this time, the discharge current is sent to the next stable section 52. However, the output current from the above-mentioned ringing signal detection circuit 4 is interrupted every 2 seconds of interruption of the calling signal, and the charging of the capacitor c8 is interrupted each time.
In order to prevent the current from flowing from the capacitor to the stabilizer 52 to be interrupted, the discharge current from the capacitor is adjusted in advance by a variable resistor VR.

On the other hand, when there is no input from the converting section 51, the transistor TR6 in the stabilizing section 52 is in a cut-off state because the voltage across the resistor R12 is applied to the base in the opposite direction.
Transistor TR7 is connected to resistor R9,
Since it is applied to the base in the forward direction via R11, it is in a conductive state. Therefore, at this time, from the DC power source E to the resistor RI
The current supplied through O goes to transistor TR7, and its power supply voltage is not applied to the next amplification section 53.

When the input from the conversion unit 51 is given to the stabilizing unit 52 in this state, the collector current of the transistor TR6 starts to flow, decreasing the collector current of the transistor TR7, and the decrease in the latter further increases the current in the former. Therefore, within a short time, transistor TR6 is turned on and transistor TR7 is turned on and stabilized. Then, the voltage of the DC power supply E changes to the resistance RIO, R1.
3, the transistor TR in the next amplification section 53
8, and in order to make it conductive, the amplifying section performs current amplification according to the output from the stabilizing section 52 and outputs it.

This output operates the melody signal generation section 61 of the melody unit circuit 6 through the adjustment section 81, and the melody signal generated from the core section is amplified by the amplification section 62, and the electronic sound melody is output from the speaker SPK. - is played.

Therefore, the incoming call signal is converted into an aurally pleasing electronic sound melody instead of the mechanical ringing of the AC bell built into the telephone 2, and is propagated around the telephone.

Therefore, when the handset of the telephone 2 is removed, the terminal plate 9 and the cutter are connected to the telephone and the handset status detection circuit 3 via the receiver 10.
from the DC power supply E to the resistor R1° switching contact al, the terminal TLI, and the telephone 2. A current flows from the resistor R2 of the handset/receiver removal detection section 32 to the capacitor C1 via the terminal TL2 and the switching contact a2. Then, the transient current while charging the capacitor C1 is amplified by the next amplifying section 33,
The current flows to the primary coil A1 of the latching type relay 31, and changes the switching contact al+a2 of the relay to the remaining switching contact a3.
．． Operate including A4 and connect telephone 2 and telephone line (L
1) and (L2) from the previous blocking state to the connecting state.

This switching is confirmed by the call state detection section 34, and the operation of the above-described melody/sound control circuit 5 is stopped. That is, the handset is removed, and the telephone set 2 and the telephone line (Ll), (L2
), and a DC loop passing through the telephone is formed, the exchange recognizes this and stops sending a ringing signal, and instead sends out a DC talking current (. Since the switching contact a3 of the latching type relay 31 is open to the ring signal detection circuit 4 at this time, the communication current does not flow to the ring signal detection circuit 4, but starts flowing only to the telephone set through the handset status detection circuit 3. The communication current is detected by a communication state detection unit 34 consisting of a diode bridge, which causes the photocoupler's light emitting element PCa to emit light, thereby making the coupler's light receiving element PCB conductive. The completion of switching to the proper connection mode is confirmed.

Also, at this time, the electric charge stored in the capacitor C8 of the conversion section 51 in the melody-sounding control circuit 5 is
From diode 012 to photocoupler photodetector pcb
However, since the calling signal has stopped, the capacitor C8 is not newly charged, so the potential at point (a), which is the output terminal of this converter 51, is It becomes zero at that point. Therefore, the transistors TR6 and TR7 of the stabilizing section 52 are inverted and returned to the state where the former is cut off and the latter is turned on, stopping the operation of the amplifying section 53, and therefore the operation of the melody unit circuit 6 as well. Stop.

Therefore, the sounding of the electronic tone melody based on the arrival of the calling signal stops when the handset is removed, and at the same time,
phone! Since the a2 phone is connected to the telephone line 1m (Ll) and (L2), an incoming call with the calling party's telephone can be started immediately.

After such a call ends, when the handset of the telephone 2 is hung up, the telephone current from the exchange side stops flowing to the telephone, so the photocoupler light-emitting element PCa of the telephone call state detection unit 34 stops emitting light, and the same light is not received. Element pcb is cut off. Then, the current flowing from the DC power source E to the detector 35 of the handset/receiver hook via the resistor R4 charges the capacitor C4.
While the capacitor C3 is also being charged, the transient current is amplified by the next amplifying section 36, and the latching type relay 3 is amplified.
1's secondary coil A2, and the relay's switching contacts a1~
Return a4 and connect telephone 2 and telephone line (Ll), (L
2) from the previous connection state to the original disconnection state.

Therefore, the telephone 2 and the conversion device attached thereto return to a standby state in preparation for the arrival of the next calling signal.

On the other hand, in this standby state, when the handset of the telephone 2 is removed to make an outgoing call, the switching contacts a1 to a4 of the latching type relay 31 operate in the same way as for the above-mentioned incoming call, and the telephone 2 and Telephone line (Ll>.

(L2) is switched to the connection mode. Then, from the exchange side, a DC talking current and a continuous dial tone of 40011z are sent to the telephone set 2 via the line. This communication current is detected by the communication state detection section 34, and in order to conduct the photocoupler light receiving element PCB in the same manner as described above, the handset/receiver hook is connected to the capacitor C3 of the detection section 35,
The electric charge stored in C4 is discharged, and at the same time, the point (a) of the melody/sound control circuit 5 is maintained at zero potential.

Furthermore, since the switching contact a3 of the latching type relay 3 is open to the calling signal detecting circuit 4 at this time, the above-mentioned talking current and dialing tone do not go to the calling signal detecting circuit 4. In addition, even if other audible signal tones necessary on the exchange connection are sent to the telephone set 2 at this time, the signal tones are not directed to the ringing signal detection circuit 4 in the same way.

Therefore, the erroneous playing of an electronic tone melody caused by disconnecting the handset during an outgoing call can be completely avoided.

Next, the push button dial or rotary dial of the telephone 2 is operated in order to select the destination of the call. With push-button dialing, a so-called PB multiplied signal of AC, which is a combination of selected frequencies from both the high frequency group and the low frequency group within the voice band, is sent to the exchange, but at this time, it is not possible to make a direct current call. There is no possibility that the current will be interrupted.

On the other hand, with a rotary dial, a series of dial pulses are generated by intermittent DC communication current supplied from the exchange as the dial rotates, and are sent to the exchange.

Therefore, when this dial pulse is sent out, the intermittent current caused by the pulse is detected by the call state detection section 34 of the handset state detection circuit 3, and the light receiving element PCb of the photocoupler is detected.
, conduction.

This results in repeated alternating reversals to both states of interruption.

However, when the light receiving element PCb of the photocoupler is cut off at the disconnected part of the dial pulse, the transmitter/receiver hook is connected to the detection part 3.
The time constant of the resistor R4 and the capacitor C4 in 5 effectively prevents the sending of the transient current to the amplifier section 36, and when the light receiving element PCb is made conductive at the contact portion of the pulse, the charge in the capacitor C4 is discharged. Therefore, no current flows to the side of the secondary coil of the latching type relay 31 while the dial pulse is being sent.

Therefore, when dialing, the telephone 2 and the telephone line (
Ll) and (L2) are kept connected during dialing, regardless of whether it is a push button dial or a rotary dial, and are not used for sending out the PB double signal or the dial pulse. It has no impact.

Furthermore, even during the above-mentioned dial operation, the switching contact a3 of the latching type relay 31 is opened to the calling signal detection circuit 4 as described above, so that even when the above-mentioned alternating current PB double signal or dial pulse is interrupted, No impact current can enter the circuit.

Therefore, erroneous playing of electronic melodies due to dial operations during outgoing calls can be completely avoided.

However, when displaying the call status, the voltage polarity of the call current is reversed or reversed depending on the exchange method, but even if there is such a change in polarity, the call status detection unit 34 of the handset status detection circuit 3 Then, the communication current is always taken out with polarity in one direction and flows to the light emitting element PCa of the photocoupler.Therefore, during the communication, the photocoupler light receiving element PCb is conductive from beginning to end, and the melody-sounding control circuit The melody unit circuit 6 is not operated by keeping the point (a) of 5 at zero potential.

Therefore, during a telephone call, either outgoing or incoming, the erroneous playing of an electronic tone melody due to a change in the polarity of the telephone current can be completely avoided.

During such a call, the manual operation section 7 of the hold tone sending circuit 7
1, the melody unit circuit 6 is activated directly.

Then, the melody signal generated from the melody signal generating section 61 at this time causes the speaker SPK to play an electronic sound melody in the same way as when the calling signal arrives, but it also causes the melody signal transmitting section 72 to produce an electronic sound melody. At the same time, the signal is sent from the telephone line (Ll) to the telephone set 2.

(L2) is also sent to the other party's telephone as a hold tone. The transmission of such hold music is performed by the above-mentioned speaker SPK.
This can be confirmed audibly by the ringing action of the speaker SPK, but at the same time, it can also be confirmed visually by the colored light emitted from the light emitting diode LED connected in series with the operating contact R5. To easily determine that an operation is not based on the arrival of a calling signal. Note that the capacitors C11 and C12 and the transformer T of the sending section 72 prevent the inflow of DC components from the telephone lines (Ll) and (L2) to the melody unit circuit 6 and the spread of high voltage. protect

Therefore, even if the telephone 2 does not have a hold tone sending function, it is possible to send an aurally pleasing electronic tone melody as a hold tone to the telephone of the other party during a call at any time.

By the way, in the case where the DC power supply circuit 8 uses the battery B, the battery B is exhausted or detached, or when the commercial AC power is used after step-down rectification, the power outage is handled as follows: Correspond as follows.

First, the latching relay 31 of the handset status detection circuit 3
It is assumed that the telephone set 2 and the telephone lines (Ll) and (L2) are cut off. At this time, when the voltage of the DC power supply E decreases due to exhaustion of the battery B and becomes below the allowable value, the current with the decreased voltage is detected based on the lambda type negative resistance of the diode D7 of the voltage drop detection section 37. The current begins to flow through the diode to the amplifying section 33, and the amplified current flows to the primary coil A1 of the relay, and the switching contact a
1 to a4, the relay is switched to the connected state and remains in that state thereafter. Also, the voltage is
Even if the capacitor C in the DC power supply circuit 8 becomes zero due to a battery detachment or a commercial AC power outage, etc.
The discharge current from 13 passes through diode D7 to amplification section 33.
, the relay 31 is similarly switched to the connected state and remains in that state. On the other hand, when the relay 31 is in the connection state, no movement is observed even if the power supply voltage drops or becomes zero; however, after that, current flows to the secondary coil A2. Since this is unlikely, the relay in this case continues to maintain its connected state without returning from its connected state.

Therefore, when a ringing signal arrives, it is impossible to play an electronic melody or send out a hold tone, but the calling and receiving functions of the telephone 2 are completely maintained, and the arrival of a ringing signal is not possible until the telephone 2
This can be confirmed by the ringing of an AC bell left inside.

By the way, the above description of the operation of this embodiment is based on the assumption that the illustrated telephone 2 is a stand-alone telephone and that no other direct-connection telephone is attached to it. However, if this telephone 2 is one of the communal telephones or one of a group of direct-connected telephones consisting of multiple telephones, other communal or direct-connected telephones that share the telephone lines (Ll) and (L2) When making and receiving calls using the telephone 2, there is a concern that the effects of this may be exerted on the device of the embodiment added to the telephone 2, causing the electronic tone melody to be played incorrectly.

That is, in the device shown in the figure, the terminal board 9 includes terminals LE and TE in addition to the terminals R+ and R2, so the terminal RI+ R2
Connect the grounding terminal of telephone 2 to terminal TE by moving the connecting fitting between terminals R2 and LE, and connect terminal LE via the grounding terminal of a rosette for a communal power supply machine that replaces the rosette 1 for a single telephone shown in the figure. If it is grounded, the telephone 2 can be used as a communal telephone, and at this time, other communal telephones that share telephone lines (Ll) and (L2) with this telephone can be connected to the communal telephone as described above. It will be connected to the same telephone line on the exchange side rather than the rosette, via a similar type of rosette dedicated to it. Furthermore, when the illustrated telephone 2 is one of a group of direct-connected telephones consisting of a plurality of telephones, each of the other telephones that share the telephone lines (Ll) and (L2) with this telephone is On the exchange side, they are individually connected to the same telephone line via the same type of rosette.

In this way, when the illustrated telephone 2 is used as one of a communal telephone or one of a group of direct-connected telephones,
The communication current sent from the exchange to the telephone when a call is made or received on another telephone, dial tone and various other audible signals required for exchange connection, or the dial operation from the telephone to the exchange. The PB double signal, dial pulse, etc. sent to the telephone are branched to the illustrated rosette 1 or an alternative communal telephone rosette, and flow into the device of the embodiment added to the illustrated telephone 2. I'm about to try.

At this time, if the voltage output from the DC power supply circuit 8 of the device is normal, the switching contacts a1 to a4 of the launching relay 31 in the device are in the state shown, and the switching contact a3 detects the ringing signal. Since it is closed to the circuit 4, the call current, etc. that has been shunted as described above due to the incoming and outgoing calls from other telephones will flow to the ringing signal detection circuit 4 via the contact a3.

However, since the communication current is a direct current, in the calling signal detection circuit 4, it is cut off by capacitors C5 and C6,
It will not flow after that. In addition, the continuous tone of 40011z and various audible signal tones having the same fundamental frequency pass through capacitors C5 and C6 in the circuit 4 and are rectified by the rectifier 41. Since the various audible signal sounds including the outgoing tone all have a low voltage of approximately 5 volts, they are blocked by the Zener diode ZD2 and absorbed by the capacitor C7 in the next protection section 42, and then transmitted to the transistor TR5. is not reached, and therefore the melody unit circuit 6 is not activated. Furthermore, the impulse current generated along with the intermittent alternating current PB double signal or dial pulse passes through the capacitors C5 and C6 in the circuit 4, and is rectified by the rectifier 41, but these also Since the voltage is low, it is similarly absorbed and cut off by the next protection section 42, and the melody unit circuit 6 cannot be operated.

On the other hand, if the output voltage of the DC power supply circuit 8 has decreased below the permissible value, the switching contacts a1 to a4 of the latching type relay 31 have moved from the illustrated state to the opposite side, and the switching contacts a3 is open to the calling signal detection circuit 4. Therefore, in this case, the call current, etc. that has been shunted as described above due to the outgoing and incoming calls from other telephones is blocked by the contact a3, and the calling signal detection circuit 4
I never go to

Therefore, even when the telephone 2 shown in the figure is one of a communal telephone or one of a group of direct-connected telephones, the device of the embodiment added thereto can respond to calls made or received by other telephones. The situation where an electronic sound melody is played incorrectly can be completely avoided regardless of whether the output voltage of the DC power supply circuit 8 is correct or not.

In addition, since the conversion device according to this embodiment is equipped with a disconnector 10, the device can be disconnected from the telephone at any time without changing the connection to the rosette 1 and the telephone 2. Therefore, it is possible to avoid a situation where communication becomes impossible in the event of a device failure.

In addition, since pin jack terminals P1 to P4 are used for connections to other parts of the melody unit circuit 6, it is possible to easily connect and detach the circuit at any time with one that can play a different melody. can. Furthermore, as is clear from the above description, this device can be used to connect one or both of the communal telephones that share the same telephone line, or any one or more of the direct-connected telephones in a group of multiple telephones. It can be added individually to all units as is.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the technical means of the present invention, and FIG. 2 is a wiring diagram showing a specific embodiment thereof. 1 - rosette, 2 - telephone, 3 - handset status detection circuit, 4 - ringing signal detection circuit, 5 - melody - sound control circuit, 6 - melody unit circuit, 7 - hold tone sending circuit, 8 ...DC power supply circuit, 9... one terminal board, 10- disconnection device, 31- latching type relay, 32- handset/receiver removal detection section, 33- amplification section, 34- call status detection section, 35
- The transmitter/receiver hanger is a detection section, 36-... amplification section, 37- voltage drop detection section, 41-. rectification section, 42-.- protection section, 51-
Conversion section, 52-Stability section, 53-Amplification section, 61-Melody signal generation section, 62-Amplification section, 71-Manual operation section, 72
-Melody-Signal transmission unit patent applicant Noboru Tani, agent of Nippon Dentsu Construction Co., Ltd.

Claims (1)

[Claims] (1) A handset status detection circuit of the telephone interposed in the middle of the telephone line from the exchange to the telephone, a ringing signal detection circuit connected to the telephone line in parallel with the circuit, and this ringing signal. A melody-sounding control circuit that is stopped in response to the call signal detection operation of the detection circuit and a handset-removal confirmation operation of the handset status detection circuit; a melody unit circuit for playing a melody; a holding tone sending circuit for operating the unit circuit to send an electronic tone melody to the telephone and the other party's telephone during a call on the telephone; the above-mentioned handset status detection circuit; It consists of a DC power supply circuit connected to a ringing control circuit and a melody unit circuit, and the handset status detection circuit is a latching type that switches between a disconnection state and a connection state between the telephone set and the telephone line. a relay, a receiver-removal detector for operating the relay to the above-mentioned connection state when the receiver and receiver of the telephone set are removed, and an amplifying section thereof; A call state detection section that absorbs the drive input to the ringing control circuit, a receiver hook that returns the latching type relay to the above-mentioned cut-off state when the receiver is hooked, are a detection section and its amplification section, and a DC power supply. The ringing signal detection circuit is composed of a voltage drop detection section that switches the latching type relay to the above connection state even if the handset is connected when the supply voltage from the circuit drops below the allowable value. The melody-sounding control circuit is composed of a rectifying section that rectifies the contact part of the calling signal, and a protection section that absorbs and cuts off external abnormal current other than the calling signal. The melody unit circuit is composed of a conversion section that converts the input into a continuous drive input, a stabilization section that converts the continuous drive input into a stable output with a constant current value, and an amplification section thereof. The hold tone sending circuit is composed of a melody signal generating section that responds to the drive output from the melody signal generating section, an amplifying section of the melody signal generating section, and a sound generator that sounds with the melody signal. When there is a melody
It is composed of a manual operation section that operates the unit circuit independently of the melody sound control circuit, and a melody signal transmission section that connects the melody signal generation section of the unit circuit to the telephone and telephone line. A calling signal electronic sound melody conversion device for a telephone.