JPS6281159A - Conference telephone set - Google Patents

Abstract

PURPOSE:To attain a conference telephone set transmitting/receiving voice information among plural points while utilizing a conventional line by providing an operating circuit, trunk line unit circuits corresponding to number of slave sets, a switching circuit and a talking circuit to a master set. CONSTITUTION:One set of the master set and plural number of the slave sets are combined by utilizing a conventional line, and the master set is provided with the operating circuit 10, the trunk line unit circuits 20 corresponding to the number of the slave sets, a switching circuit 40 and a talking circuit 50 and each slave set is provided with an operating circuit 60 and a talking circuit 70. A call signal is sent from a dialer 21 to the slave sets by setting a simultaneous start button 12 or an individual start button 13. Further, a conference start button 14 operates a changeover switch 41 so as to change over the line from the trunk line unit circuits to the talking circuit. Moreover, the changeover switch is restored to open the line by using a cancel switch 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conference telephone device for exchanging voice information mutually and simultaneously between a plurality of locations.

In conventional conference telephone devices, voice information is exchanged by using a dedicated line and installing branch lines from the dedicated line to each of a plurality of bases. There is also a conference telephone device in use that uses general lines to exchange voice information only between three bases by operating a telephone exchange.

However, with the conference phone equipment that uses the dedicated lines mentioned above, it costs a lot of money to use the dedicated lines and install branch lines, and the location of each base is fixed. At the same time,
The problem is that in areas where there is no dedicated line, a new line must be installed.

Furthermore, the conference telephone device that uses the general line described above has a problem in that the number of bases is limited to three.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conference telephone device that uses a general line and can exchange audio information between three or more non-fixed locations.

In the present invention, one base unit and a plurality of slave units are configured using a general line, and the base unit has an operating circuit and a number of station line units corresponding to the number of slave units. Each handset is equipped with an operation circuit and a communication circuit.

When the simultaneous start button or the individual start button is turned on, a calling signal is sent from the dialer to the handset side. In addition, the conference start button activates the changeover switch,
Switch the line from the office line unit circuit to the call circuit. Further, the cancel switch returns the changeover switch to its original state and opens the line.

Part 1 FIG. 1 is a block diagram of a base unit of a conference telephone device according to an embodiment of the present invention.

In the figure, the base unit is composed of an operation circuit 10, a central office line unit circuit 20, a switching circuit 40, and a telephone communication circuit 50. Each circuit will be explained below.

1) Regarding the operation circuit 10 When the power button 11 is turned on, the power relay 111 is operated, and the conference start switch 142, the cancel switch 152, and the speaker switch 531 of the call circuit 50 are closed.

All start button 12 or individual start button 1
3 turns on the dialer 21 of the central office line unit circuit 20.
Then, signals S1 and S2 for calling the handset are sent.

When the conference start button 14 is turned on, the conference start relay 141 operates, and the changeover switch 41 of the switching circuit 40 is switched.

When the cancel button 15 is turned on, the cancel button 151 operates, and the line cancel button 42 of the switching circuit 40 opens.

2) Regarding the office line unit circuit 20, the dialer 21 stores the call destination through the memory keyboard 22. The signal S1 from the simultaneous start button 12 of the operation circuit 10 is sent to the Schmitt circuit 2.
3 to the input terminal a of the dialer 21, and the signal S2 from the individual start button 13 enters the input terminal a of the dialer 21 as it is. In response to these signals S1 and S2, a signal S3 is output from the output terminal e of the dialer 21, the line relay 211 is activated, the line switch 24 is closed, and the line is captured. When the line is a bush line, a calling signal S4 for the handset is output from the output terminal C of the dialer 21 and sent to the central office exchange through the transformer 25 and the line switch 24. If the line is a dial line,
A calling pulse signal S5 to the handset is output from the output terminal d of the dialer 21, and the dial line I 212 is intermittently operated, so that the dial switch 26 is intermittently opened and closed.
A calling signal S6 for the handset is sent to the central office exchange through the line switch 24.

When the sending of the calling signals S5 and S6 to the handset is completed,
A call completion signal S7 is output from the output terminal r of the dialer 21 to the call signal sending confirmation circuit 27.

The calling signal sending confirmation circuit 27 receives the calling completion signal S7 and outputs a melody sound sending signal S8 to the melody sound sending circuit 28, so that the melody sound sending circuit 28 sends a melody sound S9 to the line.

The polarity reversal confirmation circuit 29 is activated by reversing the polarity of the line when the handset responds, and sends the synthesized voice SIO from the voice synthesis circuit 32 to the line through the Schmitt circuit 30 only for the time set by the timer circuit 31. .

3) About the switching circuit 40 The changeover switch 41 is operated by the conference start relay 141 of the operation circuit 10 and switches the line from the office line unit circuit 20 to the telephone call circuit 50 through the line connection circuit 43.

The cancel switch 42 is activated by the cancel button 151 of the operating circuit 10 to open a connection to the line.

4) About the telephone call circuit 50 The telephone call circuit 50 includes a voice switch circuit 501 that includes an amplifier 51, a microphone iso-relay 511, a switching transistor 512, and a microphone switch 55.
including.

The audio signal from the microphone 52 is amplified by the amplifier 51,
When the switching transistor 512 is operated, the microphone switch 55 is closed by the microphone iso-relay 511, and the microphone 52 and the line are connected through the transformer 54.

Speaker 53 is connected to switching circuit 40 through transformer 54 .

FIG. 2 is a block diagram of a handset of a conference telephone device according to an embodiment of the present invention.

In the figure, the handset is composed of an operation circuit 60 and a communication circuit 70. Each circuit will be explained below.

1) About the operation circuit 60 The response button 61 operates the response relay 611, and the response switch 71 of the call circuit 70 closes.

2) About the telephone call circuit 70 The telephone call circuit 70 includes a voice switch circuit 701 that includes an amplifier 73, a microphone iso-relay 731, a switching transistor 732, and a microphone switch 76.
including.

By closing the response switch 71, the speaker 72 is connected to the line through the transformer 75.

The audio signal from the microphone 74 is amplified by the amplifier 73,
When the switching transistor 732 is operated, the microphone switch relay 31 closes the microphone switch 76 and connects the microphone 74 and the line through the transformer 75.

Figure 3 is a flowchart showing the overall flow;
The figure is a flowchart when the individual start button is turned on in the base unit.

The overall flow will be explained based on FIGS. 3 and 4.

(1) Turn on the power button 11.

(2) - Turn on the simultaneous start button 12 or the individual start button 13. - If it is a simultaneous start, all dialers 21 are activated and the line is captured. In addition, if it is an individual start, the corresponding dialer 21 is activated and captures the line.

(3) A push signal S4 or a dial signal S6 is sent from the dialer 21 to the central office exchange, and the calling of the handset is completed. At the same time as completion, a call completion signal S7 is issued from the dialer 21.

(4) In response to the call completion signal S7, the call signal sending confirmation circuit 27 issues a melody sound sending signal S8, and the melody sound sending circuit 28 sends a melody sound S9 to the line. The melody sound S9 is played even when the handset is not responding.

(5) When the handset responds, the polarity of the line is reversed. By activating the polarity reversal confirmation circuit 29, the synthesized speech S10 is sent out from the speech synthesis circuit 32 to the line only for the time set by the timer circuit 31.

(6) Turn on the conference start button 14. The changeover switch 41 operates to switch the line from the office line unit circuit to the telephone communication circuit.

(7) Hold a meeting.

(8) - If there is a handset that is not needed in a meeting that starts at the same time, turn on the cancel button 15 of that handset to open the line cancel switch 42.
Only that line will be disconnected.

(9) When the conference ends, by turning off the power button 11, the power supply is cut off, the line is opened, and all buttons and switches return to their initial positions.

According to the conference telephone device of the present invention described above, voice information can be exchanged between three or more locations that are not fixed by using a general line.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a base unit of a conference telephone device according to an embodiment of the present invention, FIG. 2 is a block diagram of a slave unit, FIG. 3 is a flowchart, and FIG. 4 is a block diagram of a base unit's individual start button. This is a time chart. 10... Operation circuit of base unit, 11... Power button, 1
2... Simultaneous start button, 13... Individual start button, 14... Conference start button, 15... Cancel button, 20... Office line unit circuit, 21...
...Dialer, 22...Memory keyboard, 23
...Schmitt circuit, 24...Line switch, 25
...Transformer, 26...Dial switch, 27.
... Calling signal sending confirmation circuit, 28... Melody sound sending circuit, 29... Polarity reversal confirmation circuit, 30... Schmitt circuit, 31... Timer circuit, 32... Voice synthesis circuit, 4o... ...Switching circuit, 41... Selector switch, 42... Line cancellation switch, 43...
・Line connection circuit, 5゜...Main phone call circuit, 51...
・Amplifier, 52...Microphone, 53...Speaker, 5
4...Transformer, 55...Microphone switch, 6o・
・・Slave device operation circuit, 61 ・Response button, 7o・・
・Call circuit of handset, 71...Response switch, 72...
・Speaker, 73...Amplifier, 74...Microphone, 7
5...Transformer, 111...Power relay, 14
1...Conference star) IJ lzi, 142
... Conference start switch, 151 ... Cancel button, I52 ... Cancel switch,
211...Line relay, 212...Dial relay, 5o1...Voice switch circuit, 511
... Microphone switch, 512 ... Switching transistor, 531 ... Speaker inch, 611 ... Response relay, 701 ... Audio switch circuit, 731 ... Microphone switch relay, 732 ... Switching transistor .

Claims (1)

[Claims] (1) A conference telephone device comprising one base unit and multiple handsets using a general line, wherein the base unit includes an operation circuit and a number of central office line units corresponding to the number of handsets. The operation circuit includes a simultaneous start button, a number of individual start buttons corresponding to the number of handsets, a conference start button, and a number of buttons corresponding to the number of handsets. a cancel button, and the station line unit circuit includes a dialer activated by a simultaneous start button or an individual start button, a calling signal sending confirmation circuit connected to the dialer, and a melody activated by a signal from the calling signal sending confirmation circuit. It is equipped with a sound sending circuit, a polarity reversal confirmation circuit, and a voice synthesis circuit activated by a signal from the polarity reversal confirmation circuit, and the switching circuit is connected to the office line and the line and activated by a cancel button. It is equipped with a cancel switch, a changeover switch that switches the office line unit circuit to a voice call circuit upon activation of a conference start button, and a line connection circuit, and the voice call circuit is connected to an audio switch circuit. Each handset is equipped with a microphone and a speaker, and each handset has an operation circuit equipped with a response button.
1. A conference telephone device comprising: a response switch that is closed by actuation of a response button; a microphone connected to the response switch via an audio switch circuit; and a communication circuit equipped with a speaker.