JPS6210956A - Loudspeaking calling equipment - Google Patents

Abstract

PURPOSE:To make it possible to use a loudspeaking calling using only one subscriber line by providing an anti-side tone circuit that can connect a loudspeaking section and a subscriber line. CONSTITUTION:A remote terminal is called by using a basic telephone function section 23 through a communication circuit 21, and when an answer is received, a circuit reserving section 25 switches a change-over switch 24, and at the same time, reserves a communication circuit 21. In the case where the remote terminal is an individual loudspeaking telephone set, the communication circuit 21 reserved by the circuit reserving section 25 is switched and connected to a loudspeaking section 29 by a loudspeaking mode switching section 28. When the mode changing switch of a loudspeaking mode selecting function section 41 is depressed, the loudspeaking section 29 is connected to the communication circuit 21 through an anti-side tone circuit 42. Accordingly, even when the remote terminal is the individual loudspeaking telephone set of one circuit containing type, the loudspeaking is made possible using this equipment. Thus, loudspeaking calling becomes possible even when the remote terminal is the individual telephone set of one circuit containing type.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a loudspeaker system that uses two subscriber lines to form a loudspeaker system, and which can be used as needed by adding a side sound protection circuit. This relates to a device that allows a line to be used alone.

(Prior Art) FIG. 2 is a block diagram illustrating an example of a loudspeaker telephone system that uses two lines to form a loudspeaker system, which was filed on the same day. In the figure, 21.22 is a communication line, 23 is a telephone basic function unit with call/receive function, 24 is a changeover switch for switching the communication line 21.22, and 25 is a line hold for holding the communication line 21.22. The functional section 26.27 is the communication line 2 no.

22 is a changeover switch for switching the line to a loudspeaker section 29 (to be described later) after putting the line on hold; 28 is a loudspeaker mode switching section for switching the device to the loudspeaker mode by switching the held line to the loudspeaker section; 29 is a loudspeaker section with a built-in audio switch, etc.; 30 is a microphone group;
3 is a microphone mixer amplifier, 32 and 35 are insertion loss circuits, 33 is a line amplifier, 34 is a receiving amplifier, 36
is a speaker amplifier, 37 is a speaker, and 38 detects transmitting/receiving signals A and B branched from the transmitting/receiving channel, and compares the level of these signals l~.

This is an audio switch control unit that removes the audio switch loss at the higher level and inserts the audio switch loss at the lower level.

Next, the operation will be explained step by step.

First, the telephone basic function unit 23 is used to call the other party's terminal via the communication line 21, and if there is a response, the line holding function unit 25 switches the changeover switch 24 and puts the communication line 2 on hold using the changeover switch 26. do. Next, the telephone basic function unit 23 is used to call the other party's terminal via the communication line 22, and if there is a response, the line hold function unit 25 uses the changeover switch 27 to place the communication line 22 on hold. In this way, when the line 21.22 is put on hold, the telephone basic function section 23 is disconnected from either line 21.22, but this is easily done since it corresponds to the on-hook of a normal telephone.

Now, the communication lines 21 and 22 held on hold by the line holding function unit 25 are switched and connected to the loudspeaker communication unit 29 by the loudspeaker mode switching unit 28 using the changeover switch 27. This switching operation is performed by, for example, the loudspeaker mode switching unit 28
A switching button is provided for the switch button, and by operating it, 1) the switch can be performed manually, or the line holding function section 25 can be operated automatically immediately after the communication line 21 or 22 is put on hold. It is done. In this way, when the communication lines 21, 22 and the loudspeaker telephone section 29 are connected, a loudspeaker telephone call becomes possible.

Next, the operation of the loudspeaker section 29 will be explained.

- The speaker's voice is collected by the microphone 30 and input to the mixer amplifier 3). The mixer amplifier 3 amplifies the collected sound and outputs it. mixer amplifier 3
The output audio of
The signal is amplified in width and sent to the communication port ff1J21. on the other hand,
The received signal input to the communication line 22 is amplified by the receiving amplifier 34 and is heard via the insertion loss circuit 35, the speaker amplifier 36, and the speaker 37. At this time, the audio switch control unit 38 detects the sending/receiving signals A and B branched from the sending/receiving channel, compares the signal levels, and removes the audio switch with the higher level. , insert the audio switch loss at the lower level.

The above explanation is for the sender side, but the same applies to the receiver side. That is, when responding to an incoming call, the line holding function section 25 only needs to put the communication line on hold in the same way as the caller side, and the subsequent operations are the same as on the caller side.

(Problems to be Solved by the Invention) However, with the device having the above configuration, for example, unless the other party's terminal is of the same model, it is not possible to make a loudspeaker call, or if there is a need to send materials while using the device, for example. There were a number of problems in actually using this device effectively, such as having to send documents by fax or the like using another line in some cases.

Therefore, the present invention solves the problems of the above-mentioned technology and enables mutual loudspeaker calls between different types of terminals of a device that performs loudspeaker calls using two subscriber lines, and also makes it possible to conduct loudspeaker calls between terminals of the same type. To provide a loudspeaker telephone system capable of effectively utilizing the remaining one line by switching to a loudspeaker telephone call using only one line.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a system for connecting a loudspeaker part and one communication line in a device that performs loudspeaking calls using two subscriber lines. connecting the defense sound circuit, the public address communication unit, and the defense sound circuit to one communication line i~
, a loudspeaker mode selection function section is provided for disconnecting the other communication line from the loudspeaker section.

(Function) By doing this, during a loudspeaker call using two subscriber lines, one line is used for the loudspeaker call, and the remaining line is disconnected for other purposes of the loudspeaker call, such as conference communication. It is possible to send and receive materials and to make loudspeaking calls even when the other party's terminal is a single-line loudspeaker telephone, for example. Therefore, the above-mentioned problems can be eliminated.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the loudspeaker communication device of the present invention, and 4 is a loudspeaker mode selection function section;
43.44 is a changeover switch for connecting the loudspeaker communication unit 29 from the communication line 21.22 to the protection sound circuit 42; 45 is the protection sound circuit 42;
changeover switch for connecting to communication line 2, 4
6 is a changeover switch for connecting the communication line 22 and the facsimile 47, and 21 to 38 are the same functional parts as shown in FIG. 2 with the same reference numerals.

Next, the operation will be explained.

Consider a loudspeaker call state in which the loudspeaker section 29 is connected to two lines 21 and 22. At this time, if the mode changeover switch of the loudspeaker mode selection function section 4 is pressed, the changeover switches 4.5', 44, 45, 4'6 are switched from the state shown in FIG. to the communication line 2 through the side sound circuit 42, and to the fax 4
7 is connected to the communication line 22. In this case, the state where two lines are used to make a loudspeaker call to each other will change to the situation where one line is used to make a loudspeaker call to each other, and it goes without saying that the other party will need to switch as well. It is. To do this, in this example, it is necessary to contact the other party in advance before switching. In this case, the facsimile 47 was connected, but this is not limited to the facsimile, and a microphone pickup or the like can also be connected via a modem. Therefore, even when making a loudspeaker call using two lines, it is possible to easily send and receive discussion materials and necessary data using a facsimile or the like.

Next, it will be explained that even if the other party's terminal is a single-line loudspeaker telephone, for example, it is possible to make a loudspeaker call using this device.

Without switching, the telephone basic function section 23 is used to call the other party's terminal via the communication line 2, and if there is a response, the line holding section 25 switches the changeover switch 24 and calls the communication line 2 using the changeover switch 26. Communication session 1m21 will be put on hold. At this time, if the other party's terminal is a single loudspeaker telephone, the communication line 2 held by the line-of-sight reservation section 25 is switched and connected to the loudspeaker telephone section 29 by the loudspeaker mode switching section 28 using the changeover switch 27. Thereafter, when the mode changeover switch of the loudspeaker mode selection function section 41 is pressed, the loudspeaker section 29 is connected to the communication line 21 via the side sound circuit 42. Therefore, even if the other party's terminal is a stand-alone loudspeaker telephone that accommodates one line, it is possible to make a loudspeaker call using this device. Note that at this time, the communication line 22 is in an empty state, so
Freely available for other purposes.

(Effects of the Invention) As explained in detail above, according to the present invention, subscriber lines can be connected to two
In a device that enables loudspeaker calls using telephone lines, we have installed a side sound circuit that can connect the loudspeaker part to one subscriber line. It is possible to make the line available for other purposes or to make loudspeaker calls using only one subscriber line, so when used for conference communication, for example, it can be used to send and receive materials during a conference, or to communicate with the other party's terminal. Since it is not limited to the same type of terminal, it has the effect of being extremely convenient to use.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a loudspeaker telephone system according to the present invention, and FIG. 2 is a block diagram showing a conventional loudspeaker capable of making telephone calls. 21.22... Communication line, 23... Telephone basic function section, 24.26.27... Changeover switch, 25... Line hold function section, 28... Loudspeaker call mode switching section, 29
... public address communication section, 30 ... microphone group, 32.
35... Insertion loss circuit, 37... Speaker, 38...
. . . Audio switch control section, 4 No. . . . Loudspeaker call mode selection function section, 42 . . . Side sound protection circuit, 43. 44. 45.
46... Selector switch, 47... Fax.

Claims (1)

[Claims] A line hold function unit that accommodates two communication lines, holds the communication line, a loudspeaker unit for loudspeaker calls, and a loudspeaker mode switching unit for connecting the held communication line and the loudspeaker unit. , a sound protection circuit for connecting the loudspeaker part and one line of the communication line; A loudspeaker communication device characterized by having a loudspeaker mode selection function section for disconnecting another line from the loudspeaker section.