JPH0414355A - Ringer signal transmission method for private branch of exchange - Google Patents

Abstract

PURPOSE:To prevent occurrence of harmful noise when a ringer signal is sent to a telephone set by generating a ringer signal with a delay of a 1st prescribed delay time and stopping the generation of the ringer signal before a 2nd prescribed time. CONSTITUTION:When a ringer signal is sent to a telephone set 12 connecting to a PBX, a microprocessor 40 sends a ringing interval setting signal to a switching drive element 32 to drive a switching element 31 thereby allowing the telephone set 12 to be connected selectively to a ringer signal generating section 20 for one second and to a speech circuit 16 for two seconds repetitively. A ringer signal is started to be generated with a prescribed time t<1> of delay just after the telephone set 12 is selected from the speech circuit 16 to the ringer signal generating section 20 and the ringer signal is stopped to be generated with a prescribed time t<2> of advance just before the telephone set 12 is selected from the ringer signal generating section 20 to the speech circuit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a private branch exchange (such as a home telephone or line switch) which uses a telephone as a terminal and is equipped with a ringer signal generating means.
Pr1vate Branch Exchange:
The present invention relates to a PBX (hereinafter referred to as a PBX), and more specifically relates to a ringer signal sending method for this type of PBX.

2. Description of the Related Art An example of a conventional ringer signal sending method in this type of PBX will be described below with reference to the chart of FIG. 3 showing the signal generation state when this method is adopted. That is, conventionally, in order to send a ringer signal to a telephone, a ringer signal generating means continuously generates a ringer signal (see Figure 3), and the telephone is connected to a communication circuit and this ringer signal generating means. By periodically and repeatedly switching between 1 second and 1 second when the telephone is connected to the ringer signal generating means side (see chart tal'), 1 second when the ringer is ringing when the telephone is connected to the ringer signal generating means side, and a non-ringing time when the telephone is connected to the talking circuit side. The time was 2 seconds, and the repetition was being performed.

Problems to be Solved by the Invention However, in conventional PBXs of this type, when the telephone is switched from the talking circuit side to the ringer signal generating means side, or vice versa, due to the high voltage generated by the ringer signal generating means. There has been a problem in that harmful noise such as spike 9 noise is likely to occur in the switching section, and the noise often induces malfunctions in other functions of the PBX.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an excellent method for transmitting a ringer signal of a private branch exchange, which can prevent generation of harmful noise when transmitting a telephone ringer signal.

Means for Solving the Problems In order to achieve the above object, the present invention generates a ringer signal with a first predetermined time delay immediately after switching the telephone from the mouth-road side to the ringer signal generating means side. At the same time, generation of the ringer signal is stopped for a second predetermined period of time immediately before the telephone is switched from the ringer signal generating means side to the talking circuit side.

Accordingly, according to the present invention, the generation of harmful noise is prevented when the telephone is switched between the communication circuit and the ring signal generating means in order to send the ringer signal to the telephone.
The operating reliability of the exchange is improved, and the lifespan of the telephone is also reduced because the noise does not have a negative effect on the telephone. It will be extended.

EXAMPLE A method according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows P of one embodiment for carrying out the method of the present invention.
FIG. 2 is a block diagram showing a schematic configuration of a ringer signal sending section of the BX, and FIG. 2 is a chart showing an example of a signal generation state when a method according to an embodiment of the present invention is adopted.

In FIG. 1, numeral 10 indicates the entire ringer signal sending section.

12 is a terminal telephone, which is connected to the terminal connection section 14 of the PBX. Reference numeral 16 denotes a telephone communication circuit, which is connected to the communication circuit connection section 18 of the PBX.

Reference numeral 20 denotes a ringer signal generator, which generates the ringer signal shown in the chart (bl) of FIG. 2 under the control of the microprocessor 40 when sending out the ringer signal. It is equipped with a power supply 21 for power supply and a g source 22 for driving a ringer circuit. Reverse current prevention element 2 such as
It is connected to the switching element 24 via 5.

A switching drive element 25 is connected to the switching element 24. The microprocessor 40 controls the switching drive element 25 to turn the switching element 24 on and off.

Reference numeral 30 connects the telephone 12 to the communication circuit 16 and the ringer signal generator 2.
2. This is a switching circuit for switching connection between 0 and 0, and when a ringer signal is sent out, the switching operation shown in the chart lal of FIG. 2 is performed under the control of the microprocessor 40. This switching circuit 30 includes a switching element 31,
A switching drive element 32 drives this switching element 31, and a microprocessor 40 is connected to this switching drive element 32.

Next, details of a ringer signal sending method according to an embodiment of the present invention using a PBX equipped with the ringer signal sending section 10 described above will be explained.

When transmitting a herring signal to the telephone 12 connected to the PBX, the microprocessor 40 transmits a herringing interval setting signal to the switching drive element 32 to drive the switching element 31, thereby:
As shown in the chart tal of FIG. 2, the telephone 12 is
1 second to the side of the ringer signal generator 20, and then the communication circuit 16.
The connection will be repeated repeatedly for 2 seconds.

Furthermore, the microprocessor 40 sends a herring signal to the switching drive element 25. This ringing signal has a ringing frequency (16 Hz or 20 Hz)
This is a signal that causes the switching element 24 to perform an on/off switching operation.

As already mentioned, in the conventional ringer signal sending method, the on/off operation of the switching element 24 of the ringer signal generating section 20 is performed continuously regardless of the connection switching operation of the switching circuit 30. When the switching element 31 of the switching circuit 30 switches the telephone 12 from the ringer signal generating section 20 side to the talking circuit 16 side or vice versa, harmful noise such as spike noise is generated in the switching element 31, There was a risk that the noise would have an adverse effect on the microprocessor 40 and the communication circuit 16.

Therefore, in the method of the present invention, the ringing signal is generated in synchronization with the switching operation of the switching circuit 30. That is, immediately after switching the telephone 12 from the ringer signal generator 20 side to the ringer signal generator 20 side, generation of the ringer signal is started after a first predetermined time t1 delay, and the telephone 12 is switched from the ringer signal generator 20 side to the ringer signal generator 20 side. Immediately before switching to the 16 side, generation of the ringer signal is stopped a second predetermined time t2 in advance.

This prevents harmful noise such as spike noise from occurring in the switching element 31.

Note that the first predetermined time and the second predetermined time may be the same or different.

By appropriately setting these predetermined times, generation of the ringer signal may be suspended during the switching operation of the switching circuit 31.

Effects of the Invention As is clear from the description of the embodiments above, the present invention has the following features: Immediately after switching the telephone from the communication circuit side to the ringer signal generating means side, the generation of the ringer signal is started with a first predetermined time delay; Since the generation of the ringer signal is stopped for a second predetermined period of time immediately before the telephone is switched from the ringer signal generating means side to the communication circuit side, in order to send the ringer signal to the telephone, the telephone is connected to the communication circuit. This prevents the generation of harmful noise when switching to and from the signal generation means, and therefore there is no risk of malfunctions in the components such as the microprocessor that make up the exchange, as well as the communication circuits, which improves the operational reliability of the exchange. has been improved. Furthermore, the lifespan of the phone is also extended since harmful noise does not adversely affect the phone.

[Brief explanation of drawings]

FIG. 1 shows a PB of a specific example for carrying out the method of the present invention.
FIG. 2 is a block diagram showing a schematic configuration of the ringer signal sending section of X. FIG. 5 is a chart showing a signal generation state when a ringer signal sending method is adopted. 10... Ringer signal sending section, 12... Telephone, 16
...Talking circuit, 20... Ringer signal generation section, 30...
-Switching circuit, tl...first predetermined time, t2...second
Predetermined time.

Claims (1)

[Claims] A ringer signal sending method for a private branch exchange which is connected to a telephone and a telephone circuit, and which transmits a ringer signal to the telephone by switching and connecting the telephone between the telephone circuit and a ringer signal generating means. Immediately after switching from the telephone call circuit side to the ringer signal generating means side, generation of the ringer signal is started after a first predetermined time delay, and immediately before the telephone is switched from the ringer signal generating means side to the telephone call circuit side, a second ringer signal is started to be generated. A ringer signal transmission method for a private branch exchange, in which generation of a ringer signal is stopped in advance of a predetermined period of time.