JP4027554B2 - Digital private branch exchange - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital private branch exchange apparatus capable of controlling a side tone to be sent to a receiving unit of a housed telephone.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a digital private branch exchange apparatus is known in which a voice signal is separated into a transmission side and a reception side using a voice communication path and exchanged by a time division switch. The method of separating the audio signal into the transmission side and the reception side is called a 2-wire to 4-wire conversion method, and is implemented in an analog telephone, an analog telephone interface circuit, and an analog network interface circuit.
[0003]
Of the transmission sound generated at the time of 2-wire-4 wire conversion, the sound component that wraps around the reception sound is called a side sound, and is generated by an analog telephone, an analog telephone interface circuit, and an analog network interface circuit.
[0004]
FIG. 4 is a block diagram showing the configuration of a conventional digital private branch exchange apparatus based on the 2-wire to 4-wire conversion system. The digital private branch exchange apparatus 11 accommodates an analog telephone (TEL) 12 for performing a voice call, and is an analog network. A configuration connected to a network (NW) 13 is shown.
[0005]
The digital private branch exchange 11 includes an analog telephone interface circuit (LC) 11 a connected to the TEL 12, a voice exchange switch (TSW) 11 b that performs voice exchange, and an analog network interface circuit (TRK) 11 c that is an interface with the NW 13. It consists of
[0006]
As shown in FIG. 4, the two-wire / four-wire converters in the TEL 12, the LC 11 a, and the TRK 11 c return the transmission sound of the TEL 12 to the receiving unit of the TEL 12 as a side sound.
[0007]
FIG. 5 is a block diagram showing a configuration of a conventional digital private branch exchange apparatus provided with a conference interface circuit, in which a digital private branch exchange apparatus 21 is connected to a plurality of analog telephones (TEL) 22.
[0008]
The digital private branch exchange 21 has a conference by mixing a plurality of analog telephone interface circuits (LC) 21 a connected to a plurality of TELs 22, a voice exchange switch (TSW) 21 b for performing voice exchange, and a call of three or more parties. And a conference interface circuit (CNF) 21c that enables a call service.
[0009]
With this configuration, the digital private branch exchange 21 enables the conference call service by mixing the voices of the plurality of TELs 22 with the CNF 21c and returning the mixed voices to the receiving unit of each TEL22.
[0010]
[Problems to be solved by the invention]
By the way, in the sidetone addition method for obtaining sidetones by voice components that circulate into the receiver from among the transmission voices generated at the time of 2-wire to 4-wire conversion of analog telephones, analog telephone interface circuits, and analog network interface circuits, In the case of a four-wire system that separates the voice itself from the start of voice communication to transmission and reception, such as a telephone or a digital network, there is a problem that side sound itself does not occur.
[0011]
In addition, in the sidetone addition method for obtaining sidetones by voice components that circulate into the receiver from among the transmission voices generated at the time of 2-wire to 4-wire conversion of the analog telephone, analog telephone interface circuit, and analog network interface circuit, There is a problem that the sound level of the sound itself cannot be controlled, and the sound level of the side sound itself cannot be controlled during a call.
[0012]
The present invention has been made in order to solve such a conventional problem. A side sound is generated by a digital private branch exchange apparatus, the sound level of the side sound itself can be controlled, and a call is performed by a caller's operation. An object of the present invention is to provide a digital private branch exchange apparatus capable of controlling the side sound level.
[0013]
[Means for Solving the Problems]
A digital private branch exchange apparatus according to the present invention is a digital private branch exchange apparatus that separates voice signals into a transmission side and a reception side and exchanges them on a voice communication path. Comprising a conference interface circuit for mixing the received voice from the other party's telephone connected via the terminal, and transmitting a part of the transmitted voice mixed by the conference interface circuit and the receiver of the telephone containing the received voice have.
[0014]
With this configuration, by using a conference interface circuit, a part of the transmission voice of the caller and the reception voice from the other party are mixed and transmitted to the receiver of the caller. Even if there is, side sound components can be created.
[0015]
Further, the conference interface circuit of the digital private branch exchange apparatus according to the present invention can change the level of the transmission voice that is captured by the side tone control signal from the accommodated telephone and mixed by the level control signal from the accommodated telephone. It has a configuration.
[0016]
With this configuration, it is possible to control the sound level of the side sound itself by controlling the received sound level in the conference interface circuit. By controlling the received sound level in the conference interface circuit even during a call, the sound level of the side sound itself can be controlled. Adjustment can be made arbitrarily.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
[0018]
FIG. 1 is a block diagram showing an embodiment of a digital private branch exchange according to the present invention. The digital private branch exchange 1 accommodates a digital telephone (DTEL) 2 for voice communication and is connected to a digital network (DNW) 3. Is shown. In this configuration, transmission and reception are separated into four wires.
[0019]
The digital private branch exchange 1 includes a digital telephone interface circuit (DLC) 1a connected to the DTEL 2, a voice exchange switch (TSW) 1b that performs voice exchange, and a digital network interface circuit (DTRK) 1c that is an interface with the DNW 3. And a conference interface circuit (CNF) 1d.
[0020]
The CNF 1d is configured to mix the transmission voice of the caller from the DTEL 2 and the reception voice from the DNW 3 and send them to the receiver of the DTEL 2.
[0021]
Next, the operation of the digital private branch exchange apparatus according to this embodiment will be described with reference to the processing flowchart shown in FIG.
[0022]
When DTEL2 is talking to the other party's telephone via DNW3 (step S1), a sidetone control signal is transmitted from DTEL2 to digital private branch exchange (PBX) 1 (step S2). This is done, for example, by hooking and manipulating a specific number.
[0023]
The PBX 1 captures the CNF 1d and sends a capture completion signal, for example, a special sound (step S3). When the originator of DTEL2 receives this acquisition completion signal, it sends a level control signal by operating a predetermined dial, for example (step S4).
[0024]
The CNF 3 inserts a loss into the sound side sound level to the DTEL 2 and continues the call, forms a call path as shown in FIG. 1, and performs side sound control (step S5). In this way, a side sound can be created, and the side sound level can be controlled during a call by control from the DTEL 2.
[0025]
FIG. 3 is a comparison table regarding sidetone insertion and sidetone control of the digital private branch exchange apparatus according to the embodiment of the present invention and the prior art. As can be seen from this table, both sides of the analog telephone-analog outside line call can be inserted.
[0026]
On the other hand, sidetone insertion during a telephone call between a digital telephone and a digital network is possible in the present invention, but not in the prior art. Further, the side sound level can be changed in the present invention, but it is not fixed in the prior art. Further, in the present invention, it is possible to change the side sound on the transmission side at any time by the selection signal of the transmission side user, but this is not possible in the past.
[0027]
In this way, even when the caller does not generate side sounds, as in the case of a digital telephone or a digital network, the caller transmits / receives the voice itself from the start of voice communication (four-wire system). Side sounds can be created, and the caller can arbitrarily change the side sound level during a call.
[0028]
【The invention's effect】
As described above, according to the present invention, the transmission voice from the telephone accommodated using the conference interface circuit and the reception voice from the other party telephone are mixed and transmitted to the receiver of the telephone accommodated, A side-tone component can be created even for calls that do not generate side-tones, such as a control method that separates voice signals between the sending side and the receiving side and exchanges them over the voice call path. It is possible to provide a digital private branch exchange apparatus that does not give a sense of incongruity due to digital communication.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a digital private branch exchange apparatus according to the present invention. FIG. 2 is a processing flowchart for explaining the operation of the digital private branch exchange apparatus according to the present invention. Comparison table for side-tone insertion and side-tone control of digital private branch exchange. Fig. 4 is a block diagram showing a conventional 2-wire to 4-wire conversion digital private branch exchange. Fig. 5 shows a conventional digital having a conference interface circuit. Block diagram showing private branch exchange equipment [Explanation of symbols]
1 Digital Private Branch Exchanger 1a Digital Telephone Interface Circuit (DLC)
1b Voice exchange switch (TSW)
1c Digital network interface circuit (DTRK)
1d Conference interface circuit (CNF)
2 Digital telephone (DTEL)
3 Digital network (DNW)

Claims (2)

A digital private branch exchange for separating a voice signal between a transmitting side and a receiving side and exchanging it on a voice communication path,
A conference interface circuit that mixes a part of the transmitted voice from the accommodated telephone and the received voice from the other-side telephone connected via the network;
A digital private branch exchange apparatus characterized in that a part of the transmitted voice mixed by the conference interface circuit and the received voice are transmitted to a receiver of the accommodated telephone. 2. The conference interface circuit is captured by a side tone control signal from the accommodated telephone and changes a level of the mixed transmission voice according to a level control signal from the accommodated telephone. Digital private branch exchange.

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