JPH04269046A - Digital telephone set - Google Patents

Abstract

PURPOSE:To improve the operability by making redialing in 3.4kHz automatically when there is no communication available terminal equipment in the communication mode on request at dialing. CONSTITUTION:A telephone set control circuit 5 and a line control circuit 1 are started to make 7kHz dialing and a dial number is stored in a dial number storage circuit 11. When the telephone set is interrupted from an ISDN network, an interrupt cause display is discriminated by the circuit 5 and in the case of 'terminal equipment attribute noncoincidence' or 'no opposite route available', the circuit 1 reads a number of the circuit 11 after opening a line and the circuit 1 is used newly to make 3.4kHz dialing. When the cause is other than the above, an analog circuit 6 is started to generate a busy tone and a switch 7 sets the standby state. Thus, when a terminal equipment available of communication in the communication mode requested at dialing is not in existence in the opposite party, redialing is implemented automatically in the voice communication mode in 3.4kHz to improve the service performance and the operability at dialing considerably in the equipment having plural communication modes.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone capable of connecting in at least one other communication mode in addition to the 3.4 kHz voice communication mode.

0002

[Prior Art] Conventional telephones have a voice transmission band of 3
．． Digital telephones that connect to INS Net 64 have a built-in μ-Iaw audio codec that allows voice communication in the 3.4 kHz band over a 64 kb/s information channel, and can connect to INS Net 64 and analog networks. Communication between the INS net 64 and the conventional analog network is made possible by performing μ-Iaw digital/analog conversion at the connection point with the INS net 64 and the conventional analog network.

0003

[Problem to be solved by the invention] However, INS
Using an SB-ADPCM codec that can transmit analog signals in the 7 kHz band at 64 kb/s on Net 64 enables high-quality voice communication in the 7 kHz band, but in this case, both the calling and receiving sides Also SB-A
Since a DPCM codec is required, it is necessary to know in advance whether or not the other party's terminal has an SB-ADPCM codec, which is extremely inconvenient. . Also, SB-ADPCM
There is a problem in that a conventional analog network telephone or a digital telephone connected to the INS net 64 and having a μ-Iaw audio codec cannot be communicated with only the INS codec. Therefore, considering communication with conventional telephones, etc., in addition to the SB-ADPCM codec, μ
- A possible method is to have a built-in Iaw codec and switch the codec according to the other party's terminal when making a call, but this method requires knowing in advance the audio codec used by the other party's terminal. The problem was that it was extremely inconvenient to use, such as the need to specify the audio codec each time a call was made. Furthermore, even if the other party does not have a terminal that can communicate with the audio codec specified by the calling party, or if the other party is busy and cannot communicate, the same busy tone is displayed to the caller, so μ-Iaw It is not clear whether it is better to call again using the SB-ADPCM codec or wait for a while and then use the SB-ADPCM codec, and there is a problem that serviceability and operability are extremely poor in actual use. there were.

[0004] An object of the present invention is to automatically make a re-transmission in a 3.4 kHz voice communication mode when there is no terminal on the other end that can communicate in the communication mode requested at the time of making a call, and to have a plurality of communication modes. Serviceability and
An object of the present invention is to provide a digital telephone with significantly improved operability.

[0005]

[Means for Solving the Problems] The present invention provides ``dial number storage means for storing a dialed telephone number'' and ``3.
When a call is initiated in another communication mode other than the 4kHz voice communication mode, the called telephone number is stored in the dialed number storage means, and when disconnected from the network, the reason sent from the network is at least ( In the case of (terminal attribute mismatch) or (no destination route), the main feature is that the telephone number is read out from the dialed number storage means and automatically re-dials in a 3.4kHz voice communication mode. shall be.

[0006] The apparatus further includes a message storage means for storing a message instructing retransmission at 3.4 kHz, a message display means for displaying the message, and a clock means for measuring time. , the control means stores the dialed telephone number in the dialed number storage means when a call is activated in a communication mode other than the 3.4kHz voice communication mode, and when the call is disconnected from the network,
If the reason sent from the network is at least (terminal attribute mismatch) or (no partner route), the timekeeping means is reset and timekeeping is started, and the message storage means retransmits at 3.4kHz. A message is read out and displayed on the message display means, and when the time measured by the time measurement means reaches a certain set value, the message display is ended and the phone number stored from the dial number storage means is read out and displayed on the message display means. The function can be expanded to control readout and automatic re-transmission in 3.4kHz voice communication mode.

[0007]Furthermore, ``communication mode change local storage means for automatically changing the communication mode to 3.4 kHz voice communication mode by the control means and storing the telephone number of the destination when a re-call is made''. Additionally, when the communication mode is automatically changed to the 3.4 kHz voice communication mode and a re-call is made, the control means stores the telephone number of the destination in the communication mode change destination storage means, and to 3.4kHz
When a call is started in a communication mode other than the voice communication mode, the telephone number to be called is checked with the telephone number stored in the communication mode change ground storage means before the call is made, and if they match, the 3.4kHz voice is transmitted. The function can be expanded to control transmission in communication mode.

[0008]

[Examples] Examples of the present invention will be described below. Figure 1
is the first embodiment of the present invention, and 1 is the INS net 6
4 is a line control circuit that processes the line interface with the digital network, and 2 is a 3.4 μ-Iaw codec system.
kHz audio codec, 3 is SB-ADPCM method 7
kHz audio codec, 4 is a power supply circuit, 5 is a telephone control circuit that controls the telephone machine section, etc., 6 is an analog circuit that includes an analog amplifier, an analog filter, various tone generation circuits, etc., 7 is a telephone operation key/switch・Volume, 8 is a handset transmitter, 9 is a handset receiver, 10 is a speaker, and 11 is a dial number storage circuit that stores a dialed telephone number. Figure 2
is a flowchart showing the operation of the first embodiment of the present invention, and the operation of the first embodiment of the present invention will be explained below using this flowchart.

When a request is made to make a 7kHz call using the operation key 7, the telephone control circuit 5 and the line control circuit 1 are activated, a 7kHz call is made to the network (STEP 1), and the called telephone number is stored in the dial number storage circuit 11. Remember. When disconnected from the network (STEP 2), the reason display sent from the network at the time of disconnection is passed through the line control circuit 1 and determined by the telephone control circuit 5 (STEP 3). ” or “no destination route”, the line control circuit 1 releases the line once, reads out the telephone number stored in the dial number storage circuit 11, and once again sends a 3.4kHz call to the network by the line control circuit 1 ( ST
EP4). If the reason display is other than the above, the analog circuit 6 is activated to generate a busy tone from the receiver 9 or the speaker 10 (STEP 5), and the switch 7 is activated.
When the call termination operation is performed (STEP 6), the standby state (S
Return to TEP7). In this way, in the present invention, if there is no terminal on the other party's side that can communicate in the communication mode requested at the time of the call, the call is automatically re-transmitted in the 3.4kHz voice communication mode, so the device has multiple communication modes. It is possible to significantly improve serviceability and operability when making calls.

FIG. 3 shows the above flow as a sequence of transmitting and receiving information with the INS network. (1) is when the other party is a digital telephone, (2) is when the other party is an analog telephone outside the area, (3) shows the case where the other party is a local analog telephone. As shown in FIG. 3, in the present invention, determination is made based on the reason display at the time of disconnection, and if the other party has only a 3.4kHz audio codec using the μ-Iaw codec system (reason display "terminal attribute mismatch"), the other party Only when the party on the other end is an analog telephone (the reason displayed is "no route to the other party"), re-transmission at 3.4 kHz is performed, so it can be clearly distinguished from disconnection due to reasons such as the other party's terminal being busy.

FIG. 4 shows a second embodiment of the present invention, in which 1
2 is an LCD display, 13 is a clock circuit, and 14 is a message storage circuit. FIG. 5 shows an example of message contents stored in the message storage circuit 14, and FIG. 6 is a flowchart showing the operation of the second embodiment of the present invention. The operation of the second embodiment of the invention will be explained.

In FIG. 6, (STEP 1) (STEP 2) (S
TEP3) (STEP10) (STEP11) (STE
The operation of P12) (STEP 13) is the same as that of (STEP 13) in FIG.
1) (STEP 2) (STEP 3) (STEP 4) (S
This is the same as TEP5) (STEP6) (STEP7). In the case of "terminal attribute mismatch" or "no other party's route" in the judgment of the reason display in (STEP 3), the line is opened once by the line control circuit 1, the clock circuit 13 is reset (STEP 4), and the analog circuit 6 is activated to generate a retry announcement sound from the speaker 10 (STEP 5), and the retry message stored in the message storage circuit 14 is read out and displayed on the LCD display 12 (STEP 6). When the time measured by the clock circuit 13 reaches a certain set value (STEP 8), the display of the retry message is finished (STEP 9), and the 3.4kHz re-transmission is started (STEP 8).
10). If an operation is performed using the operation key/switch 7 to cancel the re-call (STEP 7) while the retry message is being displayed in (STEP 6), the display of the retry message will be erased, the re-call will be canceled, and the standby state (S
Return to TEP13). In this way, in the present invention, 3.4k
When re-transmitting in the Hz voice communication mode, a guide to re-transmitting is displayed, and in some cases it is also possible to cancel the re-transmitting.

FIG. 7 shows a modification of the second embodiment of the present invention, in which reference numeral 15 indicates an input terminal for a connected device that inputs an analog signal from the outside, and 16 indicates an output terminal for a connected device that outputs an analog signal to the outside. It is. FIG. 5 shows the message storage circuit 1
4 shows an example of the contents of the stored message, and FIG.
is a flowchart showing the operation of a modified example of the second embodiment of the present invention, and the operation of the modified example of the second embodiment of the present invention will be explained below using this flowchart.

In FIG. 8, (STEP 1) (STEP 2) (S
TEP4)(STEP5)(STEP6)(STEP7
) (STEP 8) (STEP 9) (STEP 10) (S
TEP11) (STEP14 and STEP18) (STE
The operations of P15, STEP 19) (STEP 16) are as shown in (STEP 1) (STEP 2) (STEP 3) (STEP 16) in Figure 6.
TEP4)(STEP5)(STEP6)(STEP7
) (STEP 8) (STEP 9) (STEP 10) (S
This is the same as TEP11) (STEP12) (STEP13). When the line control circuit 1 receives information about a call from the network (STEP 20), the analog circuit 6
is activated, and a ringback tone is generated from the handset 9 or speaker 10 (STEP 21). Thereafter, when the line control circuit 1 receives information on the other party's response from the network (STEP 22), the 7kHz audio codec 3 and the analog circuit 6 are activated to establish 7kHz communication (STEP 23). When connecting broadcasting equipment or audio conference equipment to the input/output terminals 15 and 16 and using it only in 7kHz communication mode with a specific destination, such as for high-quality broadcasting or high-quality audio conferencing, 3. It is better not to retransmit in 4kHz communication mode. Therefore, in the case of transmitting the connected device communication (STEP 3), control is performed so that retransmission in the 3.4 kHz communication mode is not performed. Also, (STE
In step P12), if the reason displayed at the time of disconnection is "the other party is busy", the other party's busy message stored in the message storage circuit 14 is read out and displayed on the LCD display 12 (STEP
17), otherwise the message storage circuit 14
The serviceability can be further improved by reading out the connection failure message stored in and displaying it on the LCD display 12 (STEP 13).

FIG. 9 shows a third embodiment of the present invention, in which 1
Reference numeral 7 denotes a communication mode change destination memory circuit that automatically changes the communication mode to the 3.4 kHz voice communication mode and stores the destination telephone number when a re-call is made. Figure 10
is a flowchart showing the operation of the third embodiment of the present invention, and the operation of the third embodiment of the present invention will be explained below using this flowchart.

In FIG. 10, (STEP 3) (STEP 4) (
STEP 5) (STEP 6) (STEP 7) (STEP
8) (STEP 9) (STEP 11) ~ (STEP 26)
) operations are shown in (STEP 1) to (STEP 23) in Figure 8.
It is similar to (STEP 14), 3.4kHz
When a re-call is made in the voice communication mode, the telephone number of the destination is stored in the communication mode change destination memory circuit 17, and then the operation key 7 is used to request a 7kHz call (ST
EP1), it is compared with the list of communication mode change destinations stored in the communication mode change destination storage circuit 17 (STE
P2), and if a match is made, the 3.4kH
Transmit z again. Note that after the retry message is displayed in (STEP 9), it is also possible to use the operation key 7 to designate transmission of 7 kHz again (STEP 10) and make the transmission. In this way, in the present invention, once the communication mode is changed and the destination of the call is memorized, the next time a call operation other than the 3.4kHz voice communication mode is performed, the 3.4kHz voice communication mode is automatically changed.
Since it is possible to change to the kHz voice communication mode and make a call, the time it takes to make a call to the other party is shortened, and serviceability and operability when making a call can be further improved. The present invention utilizes the above-mentioned SB-ADPCM codec and μ-
In addition to high-quality digital telephones with the Iaw codec, it can be applied to digital communication devices that have at least one voice/image/data communication mode in addition to the voice communication mode using the μ-Iaw codec, to improve serviceability when making calls. Operability can be improved.

[0017]

Effects of the Invention As explained above, in the present invention, if there is no terminal on the other end that can communicate in the communication mode requested at the time of making a call, the call is automatically made again in the 3.4kHz voice communication mode, and multiple This has the advantage that the serviceability and operability of a device having a communication mode can be significantly improved when making a call. Further, when re-transmitting in the 3.4 kHz voice communication mode, it is possible to display a guide to the effect of re-transmitting, and depending on the situation, it is also possible to cancel the re-transmitting. Furthermore, if you change the communication mode and memorize the destination from which the call was made, and then perform a call operation other than the 3.4kHz voice communication mode, the mode will automatically change to the 3.4kHz voice communication mode and the call will be made again. This reduces the time it takes to send a call to the other party, and further improves service quality and service when making a call.
This has the advantage that operability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is an operation flow diagram for explaining the operation of the embodiment of FIG. 1;

FIG. 3 is a sequence diagram showing the operation flow in the embodiment of FIG. 1, illustrating the transmission and reception of information with the INS network.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing an example of the contents of a message stored in a storage circuit used in the embodiment of FIG. 4;

FIG. 6 is an operation flow diagram for explaining the operation of the embodiment of FIG. 4;

FIG. 7 is a block diagram showing a modification of the second embodiment of the present invention.

FIG. 8 is an operation flow diagram for explaining the operation of the modified example of FIG. 7;

FIG. 9 is a block diagram showing a third embodiment of the present invention.

FIG. 10 is an operation flow for explaining the operation of the embodiment of FIG. 9;

[Explanation of symbols]

1 Line control circuit 2 3.4kHz audio codec 3 7kHz audio codec 4 Power supply circuit 5　Telephone control circuit 6 Analog circuit 7 Operation keys/switches/volumes 8 Transmitter 9　Telephone receiver 10 Speaker 11 Dial number storage circuit 12 LCD display 13 Clock circuit 14 Message storage circuit 15 Input terminal for connected equipment 16 Output terminal for connected equipment 17 Communication mode change ground memory circuit

Claims (3)

[Claims] [Claim 1] Connected to the ISDN network, 3.4kHz
3. In a digital telephone capable of connection in at least one other communication mode in addition to the voice communication mode, dial number storage means stores a dialed telephone number;
When a call is initiated in a communication mode other than the 4kHz voice communication mode, the called telephone number is stored in the dialed number storage means, and when the call is disconnected from the network, the reason sent from the network is at least the terminal. A digital telephone set comprising control means for reading a stored telephone number from the dial number storage means and automatically re-dialing in a 3.4 kHz voice communication mode in the case of attribute mismatch or no other party's route. [Claim 2] 3. The control means further includes a message storage means for storing a message to guide retransmission at kHz, a message display means for displaying the message, and a timekeeping means for measuring time, and the control means:
When a call is started in a communication mode other than the 3.4kHz voice communication mode, the called telephone number is stored in the dialed number storage means, and when the call is disconnected from the network, a reason display sent from the network is displayed. If at least the terminal attributes do not match or the other party's route does not exist, the timekeeping means is reset to start timekeeping, and the message displaying means reads a message from the message storage means to guide retransmission at 3.4kHz. Display the
When the time measured by the timer reaches a certain set value, the message display ends, and the stored telephone number is read from the dial number storage means, and the number is 3.4k.
2. The digital telephone according to claim 1, wherein the digital telephone is configured to automatically control re-transmission in Hz voice communication mode. 3. The communication mode is set to 3 by the control means.
The control means further includes communication mode change destination storage means for automatically changing the communication mode to 3.4kHz voice communication mode and storing the telephone number of the destination when a re-call is made. When the voice communication mode is automatically changed and a re-call is made, the telephone number of the destination is stored in the communication mode change destination storage means, and then the communication mode is changed to another communication mode other than the 3.4kHz voice communication mode. When a call is activated, the telephone number to be called is checked with the telephone number stored in the communication mode change ground storage means before the call is made, and if they match, the call is made in the 3.4kHz voice communication mode. 3. A digital telephone according to claim 1 or claim 2, characterized in that: