JPS63198454A - Digital telephone set - Google Patents

Abstract

PURPOSE:To attain excellent three-party talking without the offering of service of an exchange by using both of two channels for voice communication, providing a CODEC to each channel and using a synthesis means to synthesize the voice of opposite party respectively. CONSTITUTION:A line interface 12, a data terminal interface 16 and a control circuit 32 are connected to a switch circuit 40 of a digital telephone set and 1st and 2nd CODECs 42, 44 are connected to the circuit 40. The input side of adding circuits 46, 48 is connected to the output side of a CODEC 42 and the input side of adding circuits 46, 50 is connected to the output side of a CODEC 44. A receiver 26 is connected to the output side of the adding circuit 46 and a transmitter 28 is connected to the other input of the adding circuit 48 and the output side is connected to the CODEC 44. Moreover, the other input of the adding circuit 50 is connected to the transmitter 28 and its output is connected to the CODEC 42. The CODEC 42 is used for the channel B1 and the CODEC 44 is used for the channel B2 to attain the three-party talking.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to the 15DN network (Integrated 5e
This invention relates to digital telephones that are connected as terminals to integrated services digital networks or integrated services digital networks, and particularly relates to improvements in three-way communication systems.

[Prior Art] As a conventional digital telephone compatible with the 15DN network, there is one shown in FIG. 2, for example. This example is from IEICE Technical Report 5E.
85-92.

i2 Figure 1: The I SDN line (1o) is connected to the circuit interface (12).

This circuit interface (12) is connected to a switch circuit (14) by connection lines for two channels. This switch circuit (14) is, on the other hand, connected via a data terminal interface (16) to a data communication line (R3-232C) (18).

Next, the keyboard (20) and ringer (22) are respectively connected to the input/output interface (24), and the receiver (26) and the transmitter (28) are connected to the D/ASA signal
They are each connected to a codec (30) that performs /D conversion, and this codec (30) is connected to the above-mentioned switch circuit (14).

Furthermore, the line interface (12), switch circuit (14), input/output interface (24), and codec (30) are all connected to the control circuit (32).

Next, the operation of the above device will be explained. The signals from the information channels (B1) and (B2) are transmitted through the 15DN line (10
) and input to the circuit interface (12).

In the circuit interface (12), the input signal is processed and the information channels (B1) and (B2) are extracted, respectively. The communication path of each channel is connected to a switch circuit (1
4) is selected.

Typically, channel (B1) is connected to a codec (30) and used for voice calls via a handset (26) and a handset (28).

Channel (B2), on the other hand, is connected to a data terminal interface (16) where continuous conversion and level conversion are performed and used for data communication.

Note that the information channels (B1) and (B2) that are separated and multiplexed by the line interfaces (1, 2) mentioned above include:
Additionally, a control signal channel (D) is multiplexed.

[Problem to be Solved by the Invention 1] As described above, the conventional digital telephone has an information channel (B1), (
B2) is separated, but one is used for data communication, so services from the exchange are required to make three-way calls.

The present invention has been devised in view of the above, and an object of the present invention is to provide a digital telephone that can perform regular calls without requiring the services of an exchange.

[Means for solving the problem of inconvenience] The present invention provides first and second codecs for each of the first and second information channels, and also provides an audio signal output from these codecs and communication means. The present invention is characterized in that first, second, and third adding means are respectively provided for adding two of them and outputting the result to the remaining means.

[Operation] According to the invention, two information channels are each connected to a caller. The voices of these callers are
The signals are combined by the codec and the first adding means and output to the communication means.

Next, the voices of the caller on the first information channel and the caller on the communication means are combined by a second adding means and output to the other caller via the second codec and the second information channel. be done.

Further, the voices of the caller on the second information channel and the caller on the communication means are combined by a third adding means and output to the other caller via the first codec and the first information channel. Ru.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the same reference numerals are used for the same components as those in the prior art described above.

FIG. 1 shows an embodiment of the invention.

In this figure, the circuit interface (12
), a data terminal interface (16) and a control circuit (32) are connected to the switch circuit (40), which are connected to the first and second codecs (42), (44), respectively.

The output side of the first codec (42) is an adder circuit (46).
, (48), and the output side of the second codec (44) is connected to the adder circuits (46), (50).
are connected to the input side of each.

Next, the output side of the adder circuit (46) is connected to the above-mentioned receiver (
26). The other input side of the adder circuit (48) is connected to the transmitter (28), and the output side thereof is connected to the second codec (44). Furthermore, the other input side of the addition circuit (50) is a transmitter (28).
The output side is connected to the first codec (4
2).

Of the above parts, the first codec (42) is for the channel (B1) corresponding to the codec (30) in FIG. 2, and the second codec (44) is for the channel (B2).
).

Next, the adder circuit (46) channels (B1), (B2
), and the addition circuit (48) adds the audio of channel (B1) and the audio from the transmitter (28). Further, the addition circuit (50) adds the audio of the channel (B2) and the audio from the transmitter (28).

Next, we will discuss the overall operation of the above embodiment in the third section.
This will be explained based on the flowchart shown in the figure.

In the following explanation, as shown in FIG. 4, it is assumed that the three parties to be called are x and ySz, and Y is the owner of the telephone set in the above embodiment.

First, when a call is made from X to Y (or from Y to 2) and a connection is made (see step SA in Figure 3), the first codec (42) changes from OFF to ON (see step SC). This state is shown in FIG. 5(A), and a call is made between X and Y through the first codec (42) as indicated by the dotted arrow. and,
At that time, the telephone enters a call waiting state (see step SC).

Next, when there is no incoming call to Y and a call is made from Y to Z and the connection is established (see steps SD or SF), the second codec (44) is turned from OFF to ON (step S
(see step SH), and enters the champion call state (see step SH).
.

The channels in this champion call state and their voices are shown in FIG. 4. First, channel (B1) is used between X and Y, and audio X of X is transmitted to Y, and audio y and z of Y and 2 are transmitted to X. Further, between y and z, channel (B2) is used, and audio 2 of 2 is transmitted to Y, and audio X+y of X and Y is transmitted to Z.

Furthermore, the sound passing through each adder circuit in the above case is
This is shown in Figure (B) and is shown in a table as follows.

As described above, a champion call can be made between X5YSZ.

On the other hand, in two consecutive steps SC, when there is a company call in progress and it is accepted, the second codec (44)
is turned ON (see steps SL and SJ), and a state of champion call is entered in the same manner as in the case described above (see step SH).

Then, in the state of the champion call as described above, Y's)
[When either one of X1Z, which is one move, disconnects (see step SC), the codec (4
2) or (44) turns from ON to OFF (see step SC). Furthermore, if the other party disconnects, the call ends (see step 3M).

In the above embodiment, the voice of Y is sent to X and Z to make a champion call, but if the voice of Y is cut off, it is also possible to function as a forwarding call.

That is, when X calls Y, if Y calls Z, Y will be transferred to Z.

Further, when 2 calls Y, if Y calls X, Y will be transferred to X.

[Effects of the Invention] As explained above, according to the present invention, both of two information channels are used for voice communication, a codec is provided for each channel, and a voice synthesis means is provided for synthesizing the voices of each other party. Since this is provided for each caller, there is an effect that three-way calls can be made successfully without the need for services from the exchange side.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a telephone illustrating an embodiment of the present invention;
Fig. 2 is a block diagram showing an example of a conventional telephone, Fig. 3 is a flowchart showing an example of the operation of the embodiment, Fig. 4 is an explanatory diagram showing channels used and voices during a three-party call, and Fig. The figure is a circuit diagram showing a three-way call and operations during a three-way call. In the figure, (42) and (44) are codecs, (46)
), (48), (50) are adder circuits, (B1), (B2
) is the channel. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Patent attorney Masuo Oiwa (and 2 others) Figure 3 Amendment to termination procedure (voluntary) 21 Name of the invention Digital telephone 3, Representative of the person making the amendment Moriya Shiki 5, Invention of the specification subject to the amendment Detailed description, brief description of drawings and drawings.

Claims (1)

[Claims] Separating multiplexed first and second information channels,
In a digital telephone for making a call using a communication means, the first and second information channels are respectively connected to the first and second information channels, and output signals of each information channel to the communication means, and output input signals to each information channel. 2 codecs; a first addition means for adding the audio signals respectively output from these codecs and outputting the result to the communication means; a second addition means for adding the audio signal and outputting it to a second codec; and adding the audio signal output from the second codec and the audio signal from the communication means to the first codec. A digital telephone set comprising a third addition means for outputting an output.