JPS6182563A - Ring trip device - Google Patents

Abstract

PURPOSE:To software-process a ring trip action by inputting a silent trip detecting signal and a ring trip detecting signal through an OR gate to the switch control means. CONSTITUTION:When an off-hook is executed while the bell of a telephone set T is ringing, both ends of the telephone set T are T are connected in a direct current manner, and therefore, a direct current loop, which passes through a power source 19, a relay control rl0 and rl1, and a telephone set T, is formed, a direct current voltage of the power source 19 is overlapped to a call signal impressed to a terminal A. An amplitude of the call signal becomes small accord ing to an off-hook. A ring trip detecting circuit 14 detects this. The ring trip detecting signal is inputted through a logical OR gate 18 and an E/G separating circuit 15 to a control processor (LPR) 8 as a condition signal ST, and when a signal St becomes a logical ''0,'' LPR8 releases a relay RL. When the relay contacts rl0 and rl1 are off-hooked during releasing while the bell is ringing, a feed monitoring 13 detects a direct current loop, a silent trip detecting signal is given to LPR8 in the above-mentioned same manner, and after this, LPR 8 fixes a relay RL to a release condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a subscriber circuit connected to a time-division exchange, which includes a control fo processor (hereinafter referred to as LPR) corresponding to a line or a plurality of lines; This invention relates to an IJ device with improved ring sending and monitoring functions of the so-called BORSCHT function.

[Conventional technology]

Generally, when a telephone receives an incoming call, a ring f provided in the telephone rings intermittently due to an interringing signal. This interringing signal is, for example,
A continuous ringing signal of 16 Hz is sent to the channel by actuating a relay contact, thereby forming, for example, a cycle of 1 second of 16 Hz signal and 2 seconds of no signal. When the subscriber picks up the handset in response to an incoming call, ie, goes off-hook, the ring trip device operates to restore the relay contact, thereby stopping the intermittent ringing. In this case, the time (ring) from when the apple goes off-hook in the middle of ringing until the relay contact is restored.
Since a continuous ringing signal of 16 Hz is sent to the handset via the communication path and is heard as an unpleasant sound, it is necessary to shorten the IJ operation time as much as possible.

The ring trip operation in conventional subscriber circuits has been realized only by hardware, as will be explained in detail later with reference to the drawings. That is, to explain briefly, the DC loop detection signal detected when the subscriber line is off-hook when there is no signal in the intermittent ringing signal supplied to the subscriber line via the relay contact is referred to as the silent trip detection signal, which will be described in detail later. The DC loop detection signal is input to the control processor via the voltage separation circuit and processed by software, but the DC loop detection signal that is detected when off-hook occurs when there is an intermittent ringing signal is treated as a ring trip detection signal. was applied to a logic circuit through another voltage isolation circuit, which restored the series relay contact.

[Problems to be solved by the invention]

As mentioned above, if the ring trip operation is realized only by hardware, there is a problem that a voltage separation circuit and a logic circuit are required, resulting in a large number of parts and a cine economy.

In addition, conventionally, once an off-hook in the middle of ringing is detected, the relay contacts are fixed to the recovery state by hardware, so if the subscriber mistakenly goes on-hook immediately after going off-hook, Since the relay in the restored state cannot be operated again and therefore the ringer does not ring, there is also the problem that the subscriber cannot recognize the incoming call even though the subscriber has received a call.

Furthermore, even if off-hook is detected due to ring trip malfunction due to noise or the like, the relay contact is fixed in the restored state and the apple no longer rings.

It is possible to implement the ring trip operation using software, but as mentioned above, it is necessary to sufficiently shorten the time from when the subscriber goes off-hook until the relay contact is restored, so the software processing should be performed in real time. Although the processing content is simple, it is considered that the time required to exclusively use software for ring trip operation is long, which is uneconomical, so ring trip operation using only software has not been realized.

[Means for solving problems]

The purpose of the present invention is to solve the problems of the prior art mentioned above,
The state signal is the logical sum of the silent trip detection signal that is detected when off-hook occurs when there is no signal in the intermittent ringing signal, and the ring trip detection signal that is detected when off-hook occurs when there is a signal, and this is used for control. Based on the idea that input is input to a processor and the ring trip operation is performed by the control processor, the ring trip device reduces the number of voltage separation circuits mentioned above and eliminates the need for logic circuits, thereby reducing the number of components compared to conventional methods. The goal is to reduce costs and lower prices.

Another object of the invention is to control fa processors (rings)
By monitoring the +Jdde detection signal a predetermined number of times, even if you mistakenly go on-hook immediately after off-hook, or in a pseudo off-hook state due to noise, the relay contact is activated again to make the apple ring, thereby preventing malfunctions. The objective is to improve durability and improve service to subscribers.

The configuration of the present invention to achieve the above object includes subscriber circuit means for accommodating a plurality of subscriber lines in a time-divisional manner, continuous ringing signal generating means for generating a continuous ringing signal on which DC voltage is superimposed, switch means provided between each of the subscriber lines and the continuous ring signal generation means; switch control for converting the continuous ring signal into an intermittent ring signal and sending it to the selected subscriber line by controlling the switch means; silent trip detection means for detecting off-hook of a telephone set connected to the subscriber line when there is no signal in the intermittent ring signal supplied to the subscriber line; presence signal in the intermittent ring signal supplied to the subscriber line; At times, a ring trip detection means for detecting off-hook of the telephone, and an OR gate means for inputting the logical sum of the output of the silent trip detection means and the output of the ring trip detection means to the switch control means as a state signal. However, the switch control means performs the logical sum y
- a ring comprising means for restoring the switch means to stop supplying the intermittent ringing signal to the subscriber line when receiving a detection signal from the ring trip detecting means via the ring trip means; The trip device, which is a trip device, monitors the output signal from the ring trip detection device at predetermined time intervals, and once the switch device is restored, it monitors the output signal a predetermined number of times. Preferably, means are provided for reactivating the switch means to provide a discontinuous ring signal to the subscriber line when the output signal indicates that the telephone is on-hook.

[Operation] According to the above configuration, the shilling trip operation can be processed by software by inputting the silent trip detection signal and the ring trip detection signal to the switch control means via the logical sum f-).

Furthermore, by performing off-book detection multiple times, malfunctions can be prevented.

〔Example〕

Before describing embodiments of the present invention, the overall configuration of an electronic exchange system including a ring trip device according to the present invention will be described with reference to FIG.

In FIG. 7, a plurality of subscriber circuits (5LC) 1 (single-line telephone control cards) are connected to a switching switch card (SWC) 2 that constitutes a network NW, and the switching switch card 2 is a central processing Device (CC) 3 and memory (MEM)
) is operated by 4. .

Each subscriber circuit 1 includes a plurality of so-called BOR8Cs connected to a plurality of telephones (T) 5 via subscriber lines 6.
It includes an RT function circuit 7 and a control demiscessor (LPR) 8 that commonly controls these BOR8CRT function circuits 7. Continuous ringing signal generator (RG
N) 9 is commonly connected to all subscriber circuits 3LC. The software of the central processing unit (CC) 3 connects calls to the telephone terminal 5 and performs various services, etc.
Although there is a relatively large amount of time available, it is created for the purpose of controlling all lines. The control processor 8 commonly controls a plurality of lines accommodated in the subscriber circuit 1, but this control is a time-stricken control that is close to real-time processing. The exchange of information between each subscriber circuit 1 and the central processing unit 3 takes place on the single exchange switch card 2 through dedicated time slots, similar to conventional digitized voice signals. The signal from the continuous ring signal generator 9 is distributed to each subscriber circuit 1.

An example of the configuration of the subscriber circuit (SLC) 1 is shown in FIG.

As is well known, the subscriber circuit 1 has a line function represented by BOR8CHT. In the notation of BOR8CHT, B is the power supply function, O is the overvoltage protection function, R is the single sending function, S is the monitoring function, Cli~庺, D/A conversion function, H is the 2-wire to 4-wire conversion function, T represent test functions, respectively. In the figure, A and B are the terminals of the subscriber circuit path 10.11, which are connected to the telephone set 5 (FIG. 7). Power supply monitoring circuit (BS) 12.13 is communication path 10
．． The ring trip detection circuit (R
8) 14 is a device that detects the DC loop in the communication path at the time of a ring trip, 15 is an E/G separation circuit that separates the E system's source and the G system's mI source, and RL is a relay. Contact rLO* rtl f! : Relay to drive, 16 is a driver that drives relay RL, TST is relay contact t
17 is a driver that drives relay TST, 18 is a logical OR f-), CR is a continuous call signal excavator, SCN is a status monitoring signal that is periodically monitored by the control processor 8, SDI and SD 2 are
This is a relay drive signal sent from the control processor 8.

Of the subscriber circuit and control processor shown in FIG.
FIG. 1 shows a circuit diagram of a ring trip device according to an embodiment of the present invention, in which a portion for performing a ring trip operation according to the present invention is extracted.

In FIG. 1, parts that are the same as those shown in FIGS. 7 and 8 are given the same reference numerals.

The continuous ringing signal 9 is constructed by connecting a DC power supply 19 in series to a ringer oscillator CR. Further, another DC power supply 20 is connected in series to the power supply monitoring circuit 13 as well.

Is the silent trip detection signal from the power supply monitoring circuit 13 and the output of the ring trip detection circuit 14 logically OR? −
input into port 18. Logical or? -) 18 is inputted to the control processor 8 as a status signal ST via the output separation circuit 15. As described above, the isolation circuit 15 is an element for electrically separating the 148VOG system with a ground power supply voltage from the E system with a ground power supply voltage of OV. G
In the figure, the system includes a power supply monitoring circuit 1113, an IJ ring trip detection circuit 14, a ringer oscillator CR, and a telephone T.
1 includes the 2nd wire side of the hybrid transformer H, etc., and the E system includes logical OR? -) 18, I, the isolation circuit 15, the control grosser 8, the driver 16, the relay RL, the 4m side of the no-brid transformer H, etc.

For example, as shown in FIG. 2, the ring trip detection circuit 14 includes an integrator 21 that integrates the voltage across the resistor Ro.
and a comparator 22 that compares its output with a predetermined threshold voltage vth.

Next, the operation of the ring trip device shown in FIG. 1 will be explained.

In FIG. 1, when there is no incoming call to the telephone T, the relay contact rtOrrtl is in the recovery state (indicated by the dotted line in the figure).

Power supply monitoring circuits (BS) 12 and 13 are connected.

In this state, when the town phone T is on-hook, the DC loop is cut off by the capacitor (not shown) inside the phone T, so no current flows; however, when it goes off-hook, current flows through the phone T. A DC loop is formed, and the DC supplied from the power supply 20 flows through the communication path 10.11.

The power supply monitoring circuit 13 detects this direct current and transmits off-hook information from the detection signal to the control 7'' processor 8 as a status signal ST via the logic OR f-) 18 and the loop separation circuit 15.

When there is a call to the telephone T, the control processor 8 intermittently outputs the relay drive signal SD1, thereby causing the relay contact rtOr r4 to operate for, for example, 1 second (the state shown by the solid line in FIG. 1). and recovery for 2 seconds (dotted line g in Figure 1) are repeated. As a result, the 16Hz ring signal from the continuous ringing signal generator 9 is transmitted from the resistor Ro to the relay contact rL6-+telephone T to the relay contact r.
4 → The signal is transmitted to the telephone T as an intermittent ringing signal through the path of the resistor R1, causing the bell of the telephone T to ring intermittently.

Figure 3 shows the ring trip operation when telephone T is off-hook while a call is being made to telephone T and the relay contact "Oe rtl" is operating, that is, while the bell of telephone T is ringing. This will be explained using a voltage waveform diagram.In Figure 3, until time 11, the telephone T is on-hook and the bell is ringing.In this state,
As shown in Fig. 3(-)K, relay RL is in operation and relay contact rtO* rtl is in operation, therefore, as shown in Fig. 3(-), terminal A has a frequency of 16 Hz.
A continuous ringing signal is applied. Since the telephone T is on-hook, no DC loop is formed, so the DC voltage of the power supply 19 is not superimposed on the continuous ringing signal.

When the telephone T goes off-hook at time 11, both ends of the telephone T are connected in a DC manner, so the power supply 19, the ringer oscillator CR, the resistor RO%, the relay contact rt6゜the telephone Ts'
) Ray contact r4. A DC loop is formed through resistor R1, whereby the DC voltage of power supply 19 is superimposed on the 16 Hz continuous ring signal being applied to terminal A. Furthermore, since the load on the excavator CR is reduced when off-hook, the imaging range of the continuous call signal becomes smaller. The integrator 21 in the ring trip detection circuit 14 integrates the DC component of the voltage across the resistor R0 to obtain the output shown in FIG.
2 obtains a ring trip detection signal shown in FIG. 3(c) by comparing this output voltage with a threshold voltage vth. This ring trip detection signal is a logical OR f-
) 18 and the control processor 8 via the control separation circuit 15.
is input as a status signal ST. Control processor 8
monitors the status signal ST with a scanning signal SON of a predetermined period shown in FIG. 3(d), and the status signal ST is a logic "0".
Relay RL is promptly restored at time t2. As shown in FIG. 3(c), the logic 111 of the status signal ST
Since the width of 74 pulses at 0 m gradually increases as the integration progresses, the width of 74 pulses at logic "0" at time t3 is small. Therefore, when the period of the scanning signal SCN is long or when the frequency of the continuous paging signal is high, the control processor 8 cannot detect the logic "O" of the state signal ST at time t2, and the next logic @ at time t3 OJl may be detected.

In this case, the recovery of relay RL will also be postponed until time t, but time t! and t, scan
- The delay in the recovery of the relay RL is only two cycles of the signal SCN, so the delay in recovery of the relay RL is not a particular problem.

To ensure off-hook detection, the scanning signal SCN
In both consecutive two nodes, the state signal ST is logic''.
It is also possible to restore the relay RL only when the state signal ST becomes ``O'', but in this case, the logic of the status signal ST is ``O#''.
Since the relay RL cannot be restored unless the width of the J pulse is two or more periods of the scanning signal SCH, it takes a long time from when the subscriber goes off-hook until the apple signal tone of 16 I(z stops on the handset). On the other hand, as mentioned above, if the logic MO'' of the status signal is detected by scanning with one pulse of the scanning signal SCN and the relay RL is fixed in the recovery state, the subscriber If the handset is accidentally turned on-hook, or if the logic "0" of the status signal is caused by a malfunction due to noise or the like, relay RL cannot be operated again to make the υ hemlock ring.Therefore, the present invention In this embodiment, as will be described later in detail with reference to the flowchart in FIG. But logic 1
'', the relay RL is operated again to make the syringe ring.

If the telephone T is off-hook while a call is being made to the telephone T and the relay contact rzol r4 is being restored, that is, the ringing of the bell is disconnected, the power supply monitoring circuit 13 will close the DC loop. detects and converts the silent trip detection signal into a logical OR f-)18 and E/G
The signal is applied to the control processor 8 via the separation circuit, and the control processor 8 thereafter fixes the relay RL in the restored state.

FIG. 4 is a circuit diagram showing an example of a conventional ringt IJ device for comparison with the embodiment of the present invention. Fourth
The difference between the figure and FIG. 1 is that the single E/G separation circuit and logical OR (P-) in FIG.
G separation circuits 150 and 151 and flip-flop 15
2 and an AND gate 153, and the software processing by the control processor 80 is different from the software processing by the control processor 8 in FIG. To briefly explain the ring trip operation by this conventional circuit, the ring trip lag detection circuit 14 detects a DC current due to off-hook of the telephone T,
The ring rerun detection signal R is sent via the ring separation circuit 151.
It is transmitted to the flip-flop 152 as TP. The flip-flop 152 receives the ring trip detection signal RTP'i
Once received, it switches its output from logic "1" to logic "0#" thereby restoring relay RL by closing ANDf-) 153 and inhibiting passage of relay drive signal SDl. Since this processing is performed by hardware, the processing speed is fast and the relay can be restored quickly, but as mentioned above, the number of expensive E/G separation circuits is smaller than in the embodiment of the present invention. Since it requires a flip-flop and an AND'/'-), there is a problem that the number of parts is large and it is uneconomical. Furthermore, even if the subscriber accidentally puts the telephone back on-hook after going off-hook, or if the subscriber goes into a pseudo-off-hook state due to noise, the flip-flop 152 is set according to the first off-hook. However, since the relay RL does not operate and therefore the bell does not ring, there is also the problem that the service to the subscribers is not sufficient.

In contrast, in the apparatus of FIG. 1 according to an embodiment of the present invention,
Since the number of parts is small, it can be realized at a low cost. Furthermore, by inputting the ring trip signal to the control processor 8 through the logic-off gate 1B, the relay recovery operation speed is not reduced and errors can be avoided. Even in the case of an on-hook state or a pseudo off-hook state due to noise, the bell does not stop ringing thereafter, so service to the subscriber is also improved.

FIG. 5 is a flowchart showing the call origination/reception operation by the conventional ring trip device shown in FIG. 4, and FIG.
3 is a flowchart illustrating call originating/terminating operations according to the illustrated embodiment of the present invention. Steps 501-51 in Figure 5
0 and steps 520-526 are step 6 of FIG.
01-610 and steps 620-626. In FIG. 6, step 611 is added.

However, as described above, the determination of whether or not it is off-hook in step 505 in FIG.
2 and ff-)153, whereas the Stella f605 in Fig. 6
The control processor 8 determines whether or not the ring is off-hook by monitoring the ring trip detection signal using software.

Using the flowchart in Figure 6, the ring in Figure 1)
Call origination by the control processor 8 in the IJ tube device/
Explain the incoming call operation. In step 601, it is determined whether or not the telephone T is making a call based on whether or not it is off-hook;
If not, Stella f602 determines whether there is an incoming call to telephone T.

If there is an incoming call, incoming call control is performed in step 603, and then relay RL is operated in step 604, and Stella 7
At '605 and 606, it is determined whether or not the hook is off-hook during the one second period during which the ringer is ringing, by monitoring the ring trip detection signal using the scanning signal ST at a predetermined period, as described above with reference to FIG. do. The determination in step 605 is based on one/mother pulse of the scanning signal. Therefore, as soon as an off-hook condition is detected with one scan signal pulse, relay RL is activated in step 610.
will be restored. Therefore, the relay RL can be quickly restored without relying on hardware as in the past. After step 610, in step 611, the ring trip detection signal is scanned in multiple loops (two passes in this embodiment), and if the relay is still in the off-hook state in all the loops, the relay is set to the recovery state. The call is started at step 623. Step 61
If on-hook is detected even once in step 1, the process returns to step 604) and relay RL is operated again.

This prevents the bell from ringing again in the case of on-hook due to a subscriber's malfunction.
Even if a off-hook is detected due to a malfunction, relay RL will operate again to ring the bell. The above operations performed by Stella f604 to 606 and steps 610 and 611 are ring trip operations for detecting off-hook during ringer ringing.

If it is determined in step 606 that one second has elapsed, the ringer ringing is stopped, so in step 607 the relay RL is restored. In Stella f608 and f609, it is determined whether the off-hook occurs during the two seconds during which the ringing of the apple is stopped.

That is, in step 608, pay 1! Monitoring circuit (BS
) 13 (FIG. 1) is detected consecutively in multiple scans (in this embodiment, twice), the relay KL is fixed in the restored state and the process proceeds to step 623. The call will begin. If on-hook is detected even once in the above multiple scans, it is determined in step 609 whether or not the ringer has stopped for 2 seconds, and if not, returns to Stella: 7'608, and 2 seconds have elapsed. Step 60 to make the apple ring again
Return to step 4 and operate relay RL. Step 607~
The operation 609 is a silent trip operation that detects off-hook while the ringer is not ringing.

If it is determined in step 601 that the telephone T is making a call, the process proceeds to Stella f620, where it performs call control,
Next, in step 621, a dial pulse is received.

In this case, dial pulses are received multiple times (twice in this embodiment) in order to remove noise due to chattering, etc., and only when they match, the dial pulses are deemed valid and the dial pulse reception is terminated in step 622. death,
Proceeding to step 623, a telephone call is made.

After the call in step 623, it is determined in step 624 whether or not the call is on-hook, and if the call is on-hook, the call is terminated in step 624.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the subscriber circuit of a time division exchange, the logical sum of the silent trip detection signal and the ring trip detection signal is input to the control processor, and the logical sum is input to the control processor. By performing the ring trip operation through software processing, a low-cost ring (IJ) tube device with a reduced number of parts compared to conventional ring devices is provided. Furthermore, even when the relay is restored after going off-hook due to a subscriber's error or malfunctioning due to noise, the apple rings again, so that a ring trip device with improved resistance to malfunctions can be obtained. Furthermore, the problem of time delay in ring trip operation caused by conventional software can be solved by the software in the control processor according to the present invention.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a ring trip device according to an embodiment of the present invention; Fig. 2 is a block diagram showing an example of the configuration of the ring trip detection circuit in Fig. 1; Fig. 3 is a circuit diagram of a ring trip detection circuit according to an embodiment of the present invention; Voltage waveform diagram for explaining ring trip operation; Figure 4 is a circuit diagram showing an example of a conventional ring trip device; Figure 5 is a flowchart showing call origination/reception operation by the device in Figure 4; Figure 6 1 is a flowchart showing the call origination/reception operation in one embodiment of the present invention using the device shown in FIG. 1, FIG. FIG. 2 is a circuit diagram showing an example of the configuration of a subscriber circuit in the mobile phone. DESCRIPTION OF SYMBOLS 1...Subscriber circuit, 8...Control processor, 9.
...Continuous ringing signal generator, 12.13...Power supply monitoring circuit, 14...Logic OR ff-), 18...Ring trip detection circuit' rtO+ r4...Relay contact, RL...Relay , ST...Status signal, SCN...
・Scanning signal.

Claims (1)

[Scope of Claims] 1) Switch means provided between each of the plurality of subscriber lines and the continuous ring signal generating means; by controlling the switch means, the continuous ring signal is converted into an intermittent ring signal. , a switch control means for sending a signal to the selected subscriber line, and a silent trip detection means for detecting off-hook of a telephone set connected to the subscriber line when there is no signal among the intermittent ringing signals supplied to the subscriber line. , a ring trip detection means for detecting an off-hook of the telephone when there is a signal in the intermittent ringing signal supplied to the subscriber line; and a logical sum of the output of the silent trip detection means and the output of the ring trip detection means. 1. A ring trip device comprising logical sum gate means for inputting the signal as a state signal to said switch control means. 2) The switch control means includes means for restoring the switch means to stop supplying the intermittent call signal to the subscriber line when receiving the detection signal from the OR gate means. A ring trip device according to claim 1, characterized in that: 3) The switch control means monitors the detection signal from the OR gate means at predetermined time intervals, and once the switch means is restored, the output signal indicates that the telephone is on-hook by monitoring a predetermined number of times. 2. The ring trip device according to claim 1, further comprising means for operating said switch means again to supply said intermittent ringing signal to said subscriber line when the caller is calling.