JPS61169064A - Consultation line equipment - Google Patents

Abstract

PURPOSE:To provide a new consultation line without increasing a line between caller and called party telephone sets by disconnecting a circuit connected at the outside between the caller and the called party. CONSTITUTION:When an MF signal is transmitted from the telephone set 3 of the caller side, the signal is converted into a digital signal by a CODEC 4, and sent to a digital branching device 5 and an MF detection controller 8. The controller 8 detects the MF signal and after the dial No is identified, a control signal is sent to a switch in other direction than the called party, e.g., 7a. Thus, the switch 7a is operated to disconnect the circuit. Thus, the digital signal outputted from the branch device 5 is sent to the line via a synchronizing device 6b. On the other hand, the controller 8 detects the MF signal sent from a synchronizing device 6a at the called party side, and when the signal is the dial No. of the called party, the signal is sent to a switch from which no MF signal is sent, e.g., 7a to disconnect the circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a meeting line device used in a transmission communication system.

[Prior art]

Generally, as shown in FIG. 2, the meeting line system is configured such that telephones 11 to 1n are connected via meeting line devices 2a to 2n so that they can communicate with each other.

FIG. 3 is a block diagram showing a conventional meeting line device. In the figure, 3 is a telephone, 4 is a codec that converts the Bunalog signal output from the telephone 3 into a digital signal, 5 is a digital branching device that branches this digital signal in both directions, and 6 & and 6b are in different directions, respectively. This is a synchronizer connected to the line.

Next, the operation of the meeting line device having the above configuration will be explained. First, when an MP signal (dial) is transmitted from the calling party's telephone 3, it is converted into a digital signal by the analog MF double signal codec 4 and sent to the digital branch 5. Therefore, this digital signal is branched in both directions by this digital splitter 5, and the synchronizer 6a
and 6b to all meeting line equipment.

On the other hand, the all meeting line equipment that received the MF multiplied signal of this digital signal operates in the opposite sequence to the above-mentioned operation,
It is connected to all telephones, and any telephone can be called and a conversation can be made by MF double signal dialing.

[Problem that the invention seeks to solve]

However, with conventional meeting line equipment, the meeting line is also connected to meeting line equipment other than the calling party and the called party, so the dialogue voice is not included between the calling party and the called party. This had the disadvantage that it was not possible to communicate between telephones, reducing line usage efficiency.

[Means for solving problems]

A meeting line device according to the present invention includes a telephone, a codec that converts the digital signal into a digital signal, a digital branching device that branches the digital signal in both directions, and a first synchronizer and a second synchronizer that are respectively connected to lines in different directions. A first switch and a second switch that are connected between each of the synchronizers and the digital branch and disconnect the circuit connected to the outside between the calling party and the called party. and an MF detection controller that detects the MF multiplied signal and outputs a control signal to one of the switches.

[Effect]

In this invention, dialogue voices do not leak to meeting line devices other than the calling party and the called party, and an independent meeting line can be established between the calling party and the called party.

〔Example〕 .

FIG. 1 is a block diagram showing an embodiment of a meeting line device according to the present invention. In the figure, 7m and 7b are switching devices for disconnecting the circuits connected to the outside between the calling party and the called party, and 8 is an MF detection controller that detects the MF multiplied signal and outputs a control signal.

Next, the operation of the meeting line device having the above configuration will be explained. When an MF double signal dial (MF double signal dial) is sent from the calling party's telephone 3, this analog signal is converted into a digital signal by the MF double signal codec 4, and then sent to the digital branch 5 and the MF detection controller 8. will be sent to. Therefore, the MP detection controller 8 detects this MF multiplied signal, identifies the dial number, and then sends a control signal to a switch (for example, 7a) in a direction other than the called party. Therefore, this switch 7m operates and can disconnect the circuit. Therefore, the digital signal output from the digital branching device 5 is sent to the line via the switch Tb and the synchronizer 6b. On the other hand, on the called party's side, the MF detection controller 8 detects the MF multiplied signal sent from the synchronizer 6a, identifies the dial number, and if it is the dial number of the called party, the
Switching device on the side where the F-fold signal is not sent (e.g. 7m)
The circuit can be disconnected.

〔Effect of the invention〕

As explained in detail above, according to the meeting line device according to the present invention, by disconnecting the circuit connected to the outside between the calling party and the called party, A new meeting line can be set up without increasing the number of lines (excluding the telephone connection between the calling party and the called party), and the efficiency of line usage can be improved.

Moreover, it has the advantage that it can be used as a confidential line between the calling party and the called party.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a meeting line device according to the present invention, and FIG. 2 is a block diagram showing a general meeting line system for explaining this meeting line device.
FIG. 3 is a block diagram showing a conventional meeting line device. 1a-1n...telephone, 21-2n...fist/meeting line device, 3--fist telephone, 4-work...codec, 5
11・e・Digital turnout, 6IL and $b'*exposure@
Reference synchronizer, Ta and TbI+...switcher, 8・φφ
◆MF detection controller.

Claims (1)

[Claims] In the meeting line device comprising a telephone, a codec for converting digital signals, a digital branching device for branching digital signals in both directions, and a first synchronizer and a second synchronizer connected to lines in different directions, A first switch and a second switch are connected between each synchronizer and the digital branch, and separate the circuit connected to the outside between the calling party and the called party, and detect and control the MF signal. A meeting line device comprising: an MF detection controller that outputs a signal to one switch.