JPH05304688A - Private automatic exchange - Google Patents

Abstract

PURPOSE:To send a returning sound at the dial transmission to a sender performing an outside line outgoing and to eliminate the sense of anxiety of the sender for the outgoing control by sensually notifying of the dial transmission in making an outgoing from the private automatic exchange through a digital circuit. CONSTITUTION:In making an outside line outgoing, a control section 20 disconnects the output which is generated at a pulse generation section 18 and outputted from a low-pass filter 19 by a time switch 16 to be connected to an outgoing channel 22 based on the dial information which is sent from a control data transmitter-receiver 17. Thus, a pseudo dial pulse return sound is sent to a sender.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private automatic branch exchange, and more particularly, to a return sound control during dial transmission in a private automatic branch exchange containing a digital line.

[0002]

2. Description of the Related Art Recent advances in private branch exchanges have been remarkable. A conventional private automatic branch exchange will be described below with reference to the drawings.

4 and 5 are block diagrams showing the concept of a control unit for controlling dial transmission to a network in a conventional private automatic branch exchange. FIG. 4 shows a case where the network is connected to an analog line network. The figure shows the case of connection to a digital line network. In FIG. 4, reference numeral 1 denotes a dial pulse sending unit that sends a dial pulse to an analog line,
Reference numeral 2 is a codec which is an A / D conversion unit for converting digital voice in the private branch exchange to analog voice and vice versa. 3 is a control unit for controlling connection with the network by the dial pulse unit 1 and 4 is a premises Upward communication paths through which voice data from the automatic exchanges pass through the network pass 5 are downward communication paths through which data from the network pass through the private automatic exchanges.

In FIG. 5, 6 is a digital line interface unit which is an interface unit with a digital line, 7 is a time switch for switching voice data transmitted and received between the digital line and a private automatic branch exchange, and 8 is a network. A control data transmission / reception unit for transmitting / received control data for connection control with 9, a control data transmission / reception unit 8 for connection control with the network, and a time switch 7 for switching connection control of a communication path. Control unit 10
Reference numeral 11 is an upstream communication path through which voice data from the private branch exchange passes through the network, and 11 is a downstream communication path through which data is transmitted from the network toward the private branch exchange.

With respect to the conventional private automatic branch exchange having the above-mentioned components, the relation and operation of each component will be described below. First, referring to FIG. 4, the return sound control when connecting to an analog network will be described as a reference.
When the control unit 3 determines that the caller makes a call to an outside line, the control unit 3 starts a call operation to the network and sends a dial pulse to the network in order to notify the destination telephone number to the network. Send by 1. At this time, since the connection / disconnection of the communication path is repeated in the dial pulse transmission section 1, a return sound “patter” is transmitted to the downlink communication path 5 via the codec 2 when transmitting the dial pulse. The caller to the outside line hears this dial pulse return sound, which is
Judge that the outside line is dialed.

Next, the case of connecting to a digital network will be described with reference to FIG. 5. When the control unit 9 determines that the caller makes a call to an outside line, the control unit 9 sends a call to the network. Start. In order to notify the destination telephone number to the network, the control unit 9 switches the time switch 7 and the dial information data transmitted by the control data transmission / reception unit 8 is transmitted to the network via the digital line interface unit 6. To set. In this case, since the dial data is transmitted as data on the digital line, the dial return sound of "patter", which is the case when the analog line is connected as described with reference to FIG. 4, is sent to the downlink communication path 11. There is no such thing. Therefore, the caller to the outside line remains silent during the connection stage to the outside line.

[0007]

However, in the above-mentioned conventional method, there is no way for the caller to judge whether or not the connection operation to the outside line is normally performed, especially when the number of digits of the outgoing dial becomes large. However, when making a call using the one-touch dial, there is a problem that the silent period becomes long, and the user feels anxiety about the calling operation, and the service is lower than that when the analog line is connected.

The present invention has been made to solve the above-mentioned problems of the prior art, and provides a private automatic branch exchange having a control means for providing a return tone at the time of dial transmission even when making a call through a digital line. To aim.

[0009]

In order to achieve the above object, the private automatic branch exchange of the present invention has a first invention as a sound source comprising a pulse generator and a low-pass filter when dial information is transmitted to a digital line. And a control unit for intermittently connecting the output of the unit to the downlink communication path via the time switch unit based on the dial information, and a second invention is that the DTMF tone generating unit is configured to pseudo DTMF based on the dial information. The control unit is configured to generate a return sound and connect to the downlink communication path via the time switch unit only during that period.

[0010]

According to the present invention, in the above structure, a pseudo dial pulse tone or DTM is sent to a caller who makes an outside line.
By sending the F sound, it is possible to audibly notify that the dial is being sent.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A private automatic exchange according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a control unit required for dial return sound control in a private automatic branch exchange according to an embodiment of the present invention. FIG. 2 is a block diagram of the private automatic exchange for executing dial return sound control. FIG. 3 is a flow chart showing an outline of the processing at the time of transmission, and FIG.

In FIG. 1, reference numeral 15 is a digital line interface unit which is an interface unit with a digital line, 16 is a time switch for switching voice data transmitted and received by a private automatic branch exchange through the digital line, and 17 is a network. A control data transmission / reception unit that transmits / receives control data for performing connection control, 18 is a pulse generation unit that generates a pulse, and 19 is a sound source of a pseudo return sound, excluding the high frequency component of the pulse generated by the pulse generation unit 18. A low-pass filter 20 to be created controls the control data transmitter / receiver 17 to control connection with the network, and the time switch 1
A control unit for switching 6 to control the connection of the communication path, 21 is an up communication path through which voice data from the private automatic exchange passes through the network, and 22 is a down communication path through which data is transmitted from the network toward the private automatic exchange. ..

With respect to the private automatic branch exchange of the present embodiment comprising the above-mentioned components, the mutual relation and operation of the respective components will be described below with reference to the flowchart of FIG.
When the control unit 20 determines that the caller makes a call to the outside line (step 25), the control unit 20 activates the pulse generation unit 18 to generate a pulse (step 2).
6). The pulse generated here is the low-pass filter 19
The high frequency component is removed by and is input to the time switch 16 as the sound source of the pseudo return sound. Next, the control unit 20
Switches the time switch 16 to notify the destination telephone number to the network, and sets the dial information data transmitted by the control data transmitting / receiving unit 17 to be transmitted to the network via the digital line interface unit 15. (Step 27). After preparing to transmit the control data, the control unit 20 transmits the dial information by the control data transmitting / receiving unit 17 (step 28) and inputs it to the time switch 16 in order to make the caller hear the pseudo return sound. The low-pass filter 19, which is the sound source of the pseudo return sound, and the downlink 22 are connected by the time switch 16 based on the dial information so as to form the pattern shown in FIG. 3 (step 29). At this time, the distance between one dial and the next dial is widened so as to approximate the actual dial pulse. When the control unit 20 completes the transmission of the control information, the pulse generation unit 18 stops the generation of pulses (step 30). Considering the pulse generator 18 and the low-pass filter 19 as a sound source unit, it does not matter if the pulse is always generated.

Next, another embodiment of the present invention will be described. A DTMF tone generator (not shown) is provided in place of the pulse generator 18 and the low pass filter 19 shown in FIG. 1, and the dial value is converted into a DTMF tone based on the dial information transmitted by the control data transmitter / receiver 17. Output as a thing. At this time, the control unit 20 turns on the time switch 16.
By controlling the DTMF tone generating unit and the downlink 29 to be connected only while the DTMF tones are being generated, the return tone of the pseudo DTMF tones can be sent to the caller.

[0015]

As is apparent from the above embodiments, according to the private automatic branch exchange of the present invention, the fact that the caller making a call to the digital line is dialed is called a pseudo dial return tone. It is possible to give a sensory notification by means, especially when making a call using a one-touch dial, etc.
Since the silent state can be shortened and the caller's anxiety about the calling operation can be removed, the serviceability is remarkably improved and its practical effect is great.

[Brief description of drawings]

FIG. 1 shows a private automatic branch exchange according to an embodiment of the present invention,
Block diagram showing the concept of the control unit that performs dial return sound control

FIG. 2 is a flow chart showing a dial transmission procedure of the same process.

FIG. 3 is a waveform diagram showing an example of a return sound generation pattern in the same process.

FIG. 4 is a block diagram showing the concept of a control unit that performs dial return sound control when connected to an analog network in a conventional private automatic branch exchange.

FIG. 5 is a block diagram showing the concept of a dial transmission control unit when similarly connected to a digital network.

[Explanation of symbols]

 15 digital line interface section 16 time switch 17 control data transmission / reception section 18 pulse generation section 19 low-pass filter 20 control section 21 upstream communication path 22 downstream communication path

Claims (2)

[Claims] 1. A digital line interface unit which is a line interface unit with a digital network, a time switch unit for switching voice data and control data transmitted and received through the digital line interface unit, and a call connection control unit. In order to transmit / receive control data through the control data transmitting / receiving unit, and to switch the time switch to set the communication path, a pulse generating unit, and a high frequency component of the pulse generated by the pulse generating unit. And a filter for removing the pulse waveform when the dial information is transmitted via the control data transmission / reception unit, the control unit controls the time switch based on the dial information to connect to the downlink communication path. To send a pseudo dial-out return sound to the caller. That private automatic branch exchange. 2. A digital line interface unit which is a line interface unit with a digital network, a time switch unit for switching voice data and control data transmitted and received through the digital line interface unit, and a call connection control unit. In order to transmit and receive control data through the control data transmission / reception unit, the control unit includes a control unit that switches the time switch to set a communication path, and a DTMF tone generation unit that generates a DTMF tone. When transmitting dial information through the control data transmission / reception unit, a pseudo dial transmission return tone is generated in the DTMF tone generation unit based on the dial information, and the time switch is controlled to connect to the downlink communication path. A private automatic exchange consisting of the following.