JPH11346252A - Communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive caller information with high precision in the case that an incoming call from a 3rd party is received during communication. SOLUTION: When the communication terminal receives an incoming call from a 3rd party via a telephone line 6 during communication, an incoming display tone is sent via the telephone line 6. When a CPU 8 detects the incoming display tone, the CPU 8 controls an echo canceller 17 to suppress an output level of a side tone 23. Since the output level of the side tone 23 is suppressed, a reception system signal A21 such as an information reception terminal start tone received from the telephone line 6 via a communication circuit interface 7 is detected with high accuracy from a reception system signal B24 so that a detection circuit 16 can detect an information reception terminal start tone and the CPU 8 can detect a modem signal denoting a telephone number or the like with high accuracy. Since caller side information such as the telephone number of the modem signal detected by the CPU 8 is informed by using a notice device 18 for telephone number or the like, a third party can be located from the telephone number or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device which is connected to a communication network such as a public telephone and can notify caller information such as a telephone number of a caller sent from the communication network.

[0002]

2. Description of the Related Art A public telephone line established by Nippon Telegraph and Telephone Corporation (NTT) from February of this year (1998)
At the time of an incoming call, a service has been started in which caller information such as the telephone number of the caller is sent to a communication terminal such as a telephone on the receiving side. Before subscribing to such a service and responding to an incoming call, if the communication terminal device supports the service,
The caller's telephone number or the like is notified, and the caller can respond to an incoming call after confirming who the caller is.

[0003] When an incoming call is received from a third party during communication, a so-called call waiting service is currently being provided. With Call Waiting, when a call is received from a third party during a call, the service switches from the currently communicating party to the third party, and after the call ends, the service allows you to talk to the original party again. is there. The fact that there is an incoming call from a third party in the call waiting can be determined by, for example, an incoming call display sound as shown in FIG. The frequency of the ring tone is 400 Hz. In the called terminal device, when the incoming call display sound is heard, a hook switch can be pressed for a short time to start a call with a third party. At this time, the on-hold display sound can be heard to the communication partner side. When the call with the third party is completed, the hook switch can be pressed again to resume the communication with the original communication partner. Even when there is an incoming call due to a call waiting or the like, a service for notifying the telephone number or the like of the caller performing the interrupt is about to be started.

When an incoming call from a third party other than the communication partner occurs during a call, if it is possible to display the telephone number or the like of the third party first, it is determined whether or not to respond to the interrupt. Is valid information. However, when the caller information is received during the communication, various problems occur as compared with the case where the caller information is received and the caller information is notified before the communication. Japanese Patent Application Laid-Open No. Hei 10-13524 discloses a prior art for preventing caller information notified from a communication network from being output as a noise sound in a receiver device.

[0005]

A communication terminal device capable of notifying a caller's telephone number or the like before communication receives an activation signal or the like indicating the start of transmission of a calling telephone number from a telephone line switch before communication. , And the outgoing telephone number. In this case, the communication terminal device on the receiving side does not leak the transmission system signal of the terminal device to the receiving system because the communication terminal device has not started the communication. During communication, since the communication terminal device is performing full-duplex communication in which transmission and reception are performed over two telephone lines, part of the voice input to the transmitter is leaked to the receiver as sidetone. Then, the voice of the other party and the voice of the user are mixed and heard from the receiver. If there is an incoming call from a third party during communication, the telephone line switch will mute the signal from the other party to notify the caller of the caller's telephone number, etc. Is sent. This is because, if the signal of the communication partner is not muted, the start of transmission of a telephone number or the like is notified, and it is difficult to determine a signal such as a startup sound. The receiving terminal device receives a signal such as a start-up sound, receives a calling telephone number or the like, and reports the received calling telephone number or the like.

[0006] However, since the receiving terminal device is communicating, even if a start-up sound or the like is received from the telephone line switch, the user may continue talking. If the user continues the transmission, the transmission system signal leaks to the reception system, and there is a possibility that the start-up sound or the like cannot be detected.

It is an object of the present invention to provide a communication terminal device capable of improving the detection accuracy of a start-up sound or the like for notifying the start of transmission of caller information when there is an incoming call from a third party during communication. It is.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a communication terminal device connected to a communication network capable of notifying caller information such as a caller telephone number and capable of notifying caller information sent from the communication network. Detecting means for detecting the start of notification from a communication network when communication is performed by a third party during communication; and suppressing sidetone of a transmission signal when the detecting means detects the notification. A communication terminal device comprising a suppression unit.

According to the present invention, the communication terminal device is connected to a communication network capable of notifying caller information such as a caller telephone number. When an incoming call is received from a third party during communication, notification of caller information is performed from the communication network, and the start of the notification is detected by the detecting means. The suppression unit suppresses sidetone of the transmission signal when the detection unit detects the notification. Even if the transmission is performed during the communication, the output of the transmission system is mixed with the reception system and the sidetone is suppressed, so that it is possible to accurately receive the signal related to the notification of the caller information.

Further, the present invention is a communication terminal device connected to a communication network capable of notifying caller information such as a caller telephone number, and capable of notifying caller information transmitted from the communication network. Detecting means for detecting the start of a notification from a communication network when an incoming call is received from a third party, and suppressing means for suppressing a transmission signal when the detecting means detects the notification. Communication terminal device.

According to the present invention, a communication terminal device connected to a communication network capable of notifying caller information such as a caller telephone number detects start of notification of caller information sent from the communication network. Is detected, and the suppression unit suppresses the transmission system signal when the notification is detected by the detection unit. During communication, even if the notification of the caller information is continued without noticing, the transmission system signal is suppressed by the suppression means, so that the caller information can be accurately received, and the caller information is notified. By doing so, it is possible to easily specify a third party.

[0012] The present invention is characterized in that it comprises cancellation means for detecting the end of the notification of the sender information and suppressing the side tone of the transmission signal by the suppression means or canceling the suppression of the transmission signal. I do.

According to the present invention, when the suppression means suppresses the sidetone of the transmission system signal or suppresses the transmission system signal in response to an incoming call from a third party during communication, notification of caller information is performed. When the termination is detected, the release unit releases the suppression by the suppression unit, so that the original communication can be restarted without suppression.

In the present invention, the detecting means and the canceling means detect an incoming call display sound transmitted before and after the notification of the caller information from the communication network.

According to the present invention, since the detecting means and the canceling means detect the incoming call display sound transmitted before and after the notification of the caller information from the communication network, the transmitting system signal is transmitted during the notification of the caller information. It is possible to reliably suppress the side tone or the transmission system signal.

[0016]

FIG. 1 shows a procedure for notifying a caller-side telephone number or the like from a communication network according to an embodiment of the present invention. When receiving the caller information such as the caller telephone number from the telephone line switch 2, the telephone number etc. receiving terminal 1 displays the received caller information as the caller telephone number, etc.
It has a function of notifying that voice is output as sound. It is assumed that there is an incoming call from a third party in the sequence ST1 in which the telephone number etc. receiving terminal 1 is communicating with the communication partner of the telephone line A3 via the telephone line switching system 2. When there is an incoming request from the telephone line B4 to the receiving terminal 1 such as the telephone number of the interrupter, in a sequence ST2, the telephone subscriber line exchange 2 causes the receiving terminal 1 such as the telephone number or the like as shown in FIG. Is sent. In the next sequence ST3, the telephone line switch 2 sends out an information receiving terminal activation sound for starting to send out the caller information such as the telephone number of the interrupter of the telephone line B4 to the receiving terminal 1 such as the telephone number. I do. The information receiving terminal start-up sound has a pattern determined in advance by a combination of DTMF signals. Upon receiving the information receiving terminal activation sound, the telephone number etc. receiving terminal 1 prepares to receive the caller information such as the telephone number in the sequence ST4 by the modem signal. When the transmission of the telephone number or the like is completed, the telephone line switch 2 re-creates the communication path for the communication partner of the telephone line A3, and transmits a ring tone to the receiving terminal 1 such as the telephone number. In the receiving terminal 1 such as a telephone number, the sequence ST4
The display of the telephone number and the like to be received is displayed or notified by voice, and the user of the receiving terminal 1 such as the telephone number is assisted in determining whether or not to respond to the interrupter.

FIG. 2 shows a schematic electrical configuration of a telephone number etc. receiving terminal device 5 connected to the telephone number etc. receiving terminal 1 of FIG. A telephone line 6 is connected to the telephone line switch 2 of FIG.
The communication line interface 7 is connected via the. The telephone line interface 7 is connected to a CPU 8 that controls the whole. Communication at the receiving terminal device 5 such as a telephone number is performed using the handset 9. The handset 9 includes a receiver 10 for converting a received signal into sound and outputting the signal, and a transmitter 11 for electrically outputting a signal to be transmitted.
The receiving device 5 of the handset 9 is connected to the receiving terminal device 5 such as a telephone number so that a hands-free call can be made.
A microphone 12 is provided separately. The sound volume reproduced by the transmitter 11 and the microphone 12 can be adjusted by volume control circuits 13 and 14, respectively. The switch 15 can be switched between the transmitter 11 when using the handset 9 and the microphone 12 when performing hands-free communication.

The startup sound of the information receiving terminal transmitted via the telephone line 6 is received by the startup sound receiving circuit 16. The echo canceller 17 suppresses the transmission sound of the communication party from leaking to the reception sound side. The telephone number etc. notification device 18 performs display sound output and the like of the caller side telephone number of the caller information.

The telephone line interface 7 and the receiver 10 of the handset 9 are connected by a reception signal line 19. The input side of the starting sound receiving circuit 16 is also connected to the receiving system signal line 19. Volume control circuit 1 by switch 15
The output switched to 3 or 14 is connected to the communication line interface 7 via the transmission signal line 20. An echo canceller 17 is connected between the reception signal line 19 and the transmission signal line 20.

When an information receiving terminal activation or the like indicating the start of transmission of a telephone number or the like from the telephone line switch 2 is input to the telephone line interface 7 via the telephone line 6, the receiving system signal A21 is received. The signal is input to the start-up sound receiving circuit 16 via the signal line 19. Transmitter 11 of handset 9
The voice input to the microphone 12 during the hands-free operation is transmitted as a transmission system signal 22 to the echo canceller 17 and the communication line interface 7 via the transmission system signal line 20. The echo canceller 17 estimates the side tone 23 from the transmission signal 22 and combines it with the reception signal A21 to generate the reception signal B24.

FIG. 3 shows the receiving terminal device 5 shown in FIG.
Shows a control procedure for receiving caller information from a third party during a call. In step s1, during communication with the communication partner of the telephone line A3 in FIG. 1, if an incoming call indicating sound from the telephone line switch 2 is received in step s2, step s3.
Move to In step s3, a suppression operation is performed. In the suppression operation, the CPU 8 controls the echo canceller 17 to reduce and suppress the output level of the side tone 23. Also, CPU
8 controls the volume control circuits 13 and 14,
, The side tone 23 can be suppressed. If the control for the echo canceller 17 and the control for the volume control circuits 13 and 14 are used together, the side tone 2
3 can be more reliably suppressed. In step s3, when the side tone is suppressed, even if the user of the receiving terminal device 5 such as a telephone number inputs a voice to the transmitter 11 or the microphone 12, the side tone 2 for the reception signal B24 is obtained.
3, the starting sound receiving circuit 16 can receive the receiving signal B24 and the receiving signal A21.

When the start-up sound receiving circuit 16 of FIG. 2 receives the start-up sound of the information receiving terminal, the control for notifying the caller side telephone number and the like by the telephone number and other information notifying device 18 via the CPU 8 is started. When the caller information such as a telephone number is received as a modem signal as shown in a sequence ST4 in FIG. 1, the CPU 8 receives the caller information via the telephone line interface 7 and transmits the received caller information to the telephone number etc. notification device 18. To inform.
When the caller information notification in step s5 ends after the caller information is received in step s4, the process waits in step s6 for a ring tone indicating the end of the caller information notification. When the ring tone is received in step s6, the echo canceller 17 or the volume control circuits 13, 14 are received in step s7.
Then, the suppression of the sidetone caused by the control is released, and the process returns to step s1 to continue the original communication.

In the present embodiment, when there is an incoming call from a third party during communication and the signal of the information receiving terminal start-up sound is received from the telephone line switch 2 for the notification of the telephone number of the third party. Even if the user of the receiving terminal device 5, such as a telephone number, is transmitting without being aware of the reception, the accuracy of detecting the activation sound of the information receiving terminal can be improved. , Etc. can be reliably performed.

[0024]

As described above, according to the present invention, while receiving the caller information, the side tone of the transmission system signal is suppressed, the caller information is accurately received, and the identification of the third party can be easily performed. It is possible to do.

Further, according to the present invention, the transmission system signal is suppressed during the reception of the caller information, so that the reception accuracy of the caller information is not reduced by the transmission signal, and the notification of the caller's telephone number and the like is prevented. Can be performed with high accuracy.

Further, according to the present invention, after the side tone of the transmission system signal or the transmission system signal is suppressed for the reception of the sender information, the suppression is released when the notification of the sender information is completed. It is possible to return to the original communication state.

Further, according to the present invention, an incoming call indicator sound transmitted from the communication network is detected before and after the notification of the caller information, and the start and the cancellation of the suppression of the side tone of the transmission system signal or the transmission system signal are determined. Therefore, it is possible to reliably suppress the sidetone during the notification of the caller information.

[Brief description of the drawings]

FIG. 1 is a connection sequence diagram showing a process of notifying caller information from a communication network according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic electrical configuration of a receiving terminal device 1 such as a telephone number shown in FIG. 1;

FIG. 3 is a flowchart showing an operation of the receiving terminal device 1 such as a telephone number shown in FIG. 1;

FIG. 4 is a graph showing an incoming call display sound used for a conventional call waiting service.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telephone number etc. receiving terminal 2 Telephone subscriber line exchange 3 Telephone line A 4 Telephone line B 5 Telephone number etc. receiving terminal device 6 Telephone line 7 Communication line interface 8 CPU 9 Handset 10 Receiver 11 Speaker 12 Microphone 13,14 Volume control circuit 15 Switch 16 Start-up receiving circuit 17 Echo canceller 18 Telephone number etc. notification device 19 Receiving system signal line 20 Transmitting system signal line 21 Receiving system signal A 22 Transmitting system signal 23 Sidetone 24 Receiving system signal B

Claims (4)

[Claims] 1. A communication terminal device connected to a communication network capable of notifying caller information such as a caller's telephone number and capable of notifying caller information sent from the communication network. Detecting means for detecting the start of a notification from the communication network when there is communication from a user, and suppressing means for suppressing sidetone of a transmission signal when the detecting means detects the notification. Communication terminal device. 2. A communication terminal device connected to a communication network capable of notifying caller information such as a caller telephone number, and capable of notifying caller information sent from the communication network. A communication unit comprising: a detection unit that detects the start of a notification from a communication network when a call is received from a user; and a suppression unit that suppresses a transmission signal when the detection unit detects the notification. Terminal device. 3. The apparatus according to claim 1, further comprising a canceling unit that detects the end of the notification of the caller information and cancels the side tone of the transmission signal by the suppression unit or cancels the suppression of the transmission signal. Item 3. The communication terminal device according to item 1 or 2. 4. The communication terminal device according to claim 3, wherein said detecting means and said canceling means detect an incoming call display sound transmitted before and after notification of said caller information from said communication network.