JPS6247023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system in which a third party receives and communicates with a party who is already on a call using visual information without interrupting the call.

Conventionally, so-called telephone service systems have been developed to meet the need to answer calls from third parties while on the phone. In this service system, if a call arrives from a third party during a call, the caller alternates between calling parties. For example, if A receives a call from C while A and B are talking, A can hear the ringing tone and if A picks up, A can talk to C. During this time, B will wait with the receiver on the receiver, and if A picks up again, A will be able to talk to B.

However, such conventional systems
While one person is on the interrupting call, the other person will be forced to wait, and as you can see in the above example, A will not know who the interrupter is until he hooks up and talks to C.
Another drawback was that it was not possible to know what kind of business it was.

In order to eliminate these drawbacks, the present invention allows a third party to interrupt using visual information, thereby allowing the user to confirm the interrupter's name, phone number, business, etc. without interrupting the conversation with the other party who is already on the line. The drawings will be explained in detail below.

FIG. 1 shows an embodiment of the present invention, in which 1 is a subscriber exchange in which subscriber A is accommodated, 2 is a mixing circuit, 3 is a changeover switch circuit, and 4, 5, and 6 are subscriber A's, Terminals installed in C and B's homes, 7.
8 and 9 are communication lines, and 10 is a signal receiving circuit.

FIG. 2 shows a specific example of the above-mentioned mixing circuit 2, with 21, 2
2 are band elimination filters, 23, 24, 25 are hybrid transformers, 26, 27, 28, 29
is an amplifier, 30 is a talkie or signal tone generator,
300 is a signal tone generator. The arrows in the figure indicate the direction of signal flow. In addition, terminals a, b,
C corresponds to terminals a, b, and c in FIG.

FIG. 3 shows a specific example where the terminals 4, 5, and 6 are compound terminals, in which 31 is a telephone, 32 is an image input means, 33 is an image display means, 34 is a changeover switch,
35, 36 are band removal filters, 37 are band filters, 38, 39 are hybrid transformers, 40
is a function button. Terminal g is connected to telephone lines 7, 8, and 9 in FIG.

FIG. 4 shows an example of frequency loss characteristics of the band-rejection filter used in FIGS. 1 and 2.

Next, the operation will be described using as an example a case where subscriber A and subscriber B are on a telephone conversation in the above configuration and C interrupts A and receives a call. However, at this time, it is assumed that the changeover switch circuit 3 is switched to the d side.

First, C dials A's phone number. Then, local exchange 1 determines from A's number whether A has a multifunction terminal or not, and if it is not waiting, it sends a busy tone to C or interrupts a telephone call only. .

Furthermore, if A has a compound terminal, the subscriber exchange 1 connects C to the c terminal of the mixing circuit 2 through the changeover switch circuit 3, and notifies C by a signal tone or talkie. . If C has a multifunction terminal and intends to interrupt with an image signal, C presses the function button 40 to send a predetermined signal to the subscriber exchange 1. This signal can also be sent by a button on a push-button telephone or the like. In addition,
This may be done by sending a special signal from the subscriber exchange 1 inquiring whether it is a compound terminal, and if it is a compound terminal, it may automatically respond. Next, the subscriber exchange 1, which has received the signal from C by the signal receiver 10, switches the changeover switch circuit 3 to the a and b sides. Furthermore, a signal is sent to A, who is on the phone, to inform him that an image interruption has occurred. At this time, the signal is input to terminal a using a signal within the stop band of the band rejection filter so as not to be transmitted to subscriber B.

As a result, when A indicates that he/she intends to accept the interrupt by pressing the function button 40, A
The terminal 4 in the house switches the switch 34 from the telephone side (f side) to the compound terminal side (e side).

In this way, the connection is completed, and the
As shown in the figure, the image signal from C is transmitted through the communication line 8,
Mixing circuit terminal c, hybrid transformer 25,
23, through the mixed circuit terminal a and the communication line 7, it reaches the terminal g of the compound terminal 4 installed in A's house, and in the compound terminal 4, it passes through the e side of the changeover switch 34, the hybrid transformers 39 and 37, and then goes to the display means 33. Is displayed. In this case, conversely, A can display the image signal on the display means 33 of C by inputting the image signal using the image input means 32. Furthermore, A and B
The communication line 9, the terminal b of the mixing circuit, the hybrid transformer 24, the band elimination filter 21,
22, a hybrid transformer 23, a mixing circuit terminal a, and a communication line 7.

In the embodiment described above, as shown in FIG.
Although 1800 to 2450 Hz is used for the image signal, the band for the image signal can be widened or narrowed depending on the band required by the image signal.

In addition, although the above-mentioned embodiment describes the case where an analog line is used, even when the line is digitalized, part of the bit string used for the call between A and B is digitized and It is clear that the invention can be carried out by using in the mixing circuit 2 the so-called bitsteel technique, which is assigned to the communication (image signal) with the image signal.

In addition, in FIG. 1 of the embodiment, the changeover switch circuit 3
Although the mixing circuit 2 is directly connected to the mixing circuit 2, it is also possible to insert a concentrating switch in between to increase the usage efficiency of the mixing circuit.

As described above, according to the present invention, even if an incoming call is answered during a call, the call that has already been made is not interrupted, and it is possible to know the name, telephone number, business, etc. of the called party. There are advantages.

Furthermore, the local exchange does not need to know in advance the subscriber class of subscribers belonging to other local exchanges, that is, whether they are single telephone subscribers or subscribers with multiple terminals, and no subscriber file is required. There are advantages such as a simpler exchange and easier service implementation.

[Brief explanation of the drawing]

FIG. 1 is a line configuration diagram showing an embodiment of the present invention;
2 is a block diagram showing a specific example of the mixing circuit 2 in FIG. 1, FIG. 3 is a block diagram showing a specific example when the terminal in FIG. 1 is a composite terminal, and FIG. Band removal filters 21, 22, 3 used in Fig. 2
5 is a curve diagram showing an example of frequency characteristics of No. 5 and No. 36; FIG. 1... Subscriber exchange in which subscriber A is accommodated, 2... Mixing circuit, 3... Changeover switch circuit,
4, 5, 6... Composite terminal, 7, 8, 9... Communication line, 10... Signal receiving circuit, 21, 22... Band removal filter, 23, 24, 25... Hybrid transformer, 26, 27, 28, 29...Amplifier, 30...Talkie or signal tone generator, 300
... Signal tone generator, 31 ... Telephone, 32 ... Image input means, 33 ... Image display means, 34 ... Changeover switch, 35, 36 ... Band removal filter,
37...Band filter, 38, 39...Hybrid transformer, 40...Function button.

Claims (1)

[Claims] 1. A first means for confirming whether the interrupter has a multifunction device capable of interrupting one of the two parties during a call with a visual signal, and a method for confirming that an interruption by this first means has occurred. a second means for sending a notification signal; a third means for confirming whether the recipient of the interruption by the first means intends to receive the interruption by a visual signal; and fourth means for transmitting the visual signal of the interrupter by the first means to the called party when the person intends to receive the interruption by a visual signal. Incoming call method.