JP3388704B2 - Communication terminal device - Google Patents

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 From February of this year (Heisei 10), the public telephone line established by Nippon Telegraph and Telephone Corporation (NTT)
A service has been started in which, when a call is received, caller information such as a caller's telephone number is sent to a communication terminal such as a called telephone. If a communication terminal device that subscribes to such a service and supports the service is available,
The caller's telephone number or the like is notified so that the caller can confirm who the caller is before answering the incoming call.

When an incoming call from a third party occurs during communication, a so-called call waiting service is currently provided. With Call Waiting Service, if a call from a third party is received while you are talking, you can switch from the currently communicating party to a third party, and after the call ends, you can call the original party again. is there. The fact that there is an incoming call from a third party can be determined by the call waiting tone, for example, by the incoming call display sound as shown in FIG. The frequency of the incoming call display sound is 400 Hz. When the incoming call display sound is heard, the called terminal device can press the hook switch for a short time to start a call with a third party. At this time, the on-hold display sound can be heard by the communication partner. When the call with the third party ends, the hook switch can be pressed again to resume communication with the original communication partner. Even when there is an incoming call interruption such as a call waiting call, a service for notifying the telephone number of the caller who is making the interruption is about to be started.

When an incoming call from a third party other than the communication partner occurs during the call, if the telephone number of the third party can be displayed first, it is possible to judge whether to respond to the interrupt. It will be useful 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 Unexamined Patent Application Publication No. 10-13524 discloses a prior art for preventing the caller information notified from the communication network from being output as a noise sound in the receiving side device.

[0005]

In a communication terminal device capable of notifying a caller's telephone number or the like before communication, a start signal or the like indicating the start of transmission of a calling telephone number is received from a telephone subscriber line exchange before communication. , Informing the calling telephone number, etc. In this case, since the communication terminal device on the receiving side has not started communication yet, the transmission system signal of the terminal device does not leak to the reception system. During communication, since the communication terminal device performs full-duplex communication in which transmission and reception are performed using two telephone lines, part of the voice input to the transmitter leaks to the receiver as sidetone. Therefore, the voice from the other party and the voice of the user are mixed and heard from the handset. When there is an incoming call from a third party during communication, the telephone subscriber line exchange mutes the signal from the other party to notify the caller's telephone number, etc. Is sent. This is because if the signal of the communication partner is not muted, it is difficult to distinguish a signal such as a start-up sound by notifying the start of transmission of a telephone number or the like. The receiving terminal device receives a signal such as a start-up sound, receives a calling telephone number and the like, and notifies the received calling telephone number and the like.

However, since the receiving terminal device is in communication, the user may continue to talk even if an activation tone or the like is received from the telephone subscriber line exchange. If the user continues to talk, the transmission system signal leaks to the reception system, and there is a possibility that the activation sound or the like cannot be detected.

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

[0008]

According to the present invention, full-duplex communication is performed, and caller information sent from the communication network is connected to a communication network capable of notifying caller information such as a calling party telephone number. A communication terminal device capable of informing, which estimates a detection means for detecting the start of notification from the communication network when a communication is made by a third party during communication, and a side sound leaking the transmitted sound to the receiving sound side. Then, an echo canceller capable of adding a transmitting system signal to a receiving system signal so as to cancel the estimated side tone, and an echo canceller which controls the echo canceller to detect the side tone when the detecting means detects the notification. It is a communication terminal device comprising: a suppressing unit.

According to the present invention, the communication terminal device performs full-duplex communication and is connected to a communication network capable of notifying caller information such as a calling party telephone number. When there is an incoming call from a third party during communication, notification of caller information is given from the communication network, and the detection means detects the start of the notification. The suppression unit suppresses the side sound, which is the transmission sound leaking to the reception sound side, by the echo canceller when the detection unit detects the notification.
Even if the call is transmitted during communication, the side tone is suppressed and the call sound does not leak to the receiver, so that the signal relating to the notification of the caller information can be accurately received.

[0010]

[0011]

The present invention is characterized by further comprising release means for detecting the end of the notification of the sender information and releasing the suppression of the sidetone by the suppressing means.

According to the present invention, when the suppressing means suppresses sidetone in response to an incoming call from a third party during communication,
When detecting that the notification of the caller information has ended, the canceling unit cancels the suppression by the suppressing unit, so that the original communication can be restarted without suppressing.

According to the present invention, the detecting means and the canceling means respectively set an incoming call display sound sent from the communication network before and after the notification of the caller information as a start and an end of the notification from the communication network. It is characterized by detecting.

According to the present invention, the detecting means and the canceling means respectively detect the incoming call display sounds sent before and after the notification of the caller information from the communication network. Suppression can be surely performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 the telephone number receiving terminal 1 receives the caller information such as the caller side telephone number from the telephone subscriber line exchange 2, it displays the received caller information as the caller side telephone number or the like,
It has a function of notifying that it is converted into sound and 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 receiving terminal 1 is communicating with the communication partner of the telephone line A3 via the telephone subscriber line exchange 2. When an incoming call request is received from the telephone line B4 to the receiving terminal 1 for the telephone number of the interruption person, in step ST2, the telephone subscriber line exchange 2 causes the receiving terminal 1 for receiving the telephone number etc. to display the incoming call display sound as shown in FIG. Is sent. In the next sequence ST3, the telephone subscriber line exchange 2 sends out an information receiving terminal start-up sound for starting to send out the caller information such as the telephone number of the interruption person on the telephone line B4 to the receiving terminal 1 such as the telephone number. To do. The information receiving terminal start-up sound has a predetermined pattern based on a combination of DTMF signals. Upon receiving the information receiving terminal activation sound, the telephone number receiving terminal 1 prepares to receive the caller information such as the telephone number in the sequence ST4 as a modem signal. When the transmission of the telephone number and the like is completed, the telephone subscriber line exchange 2 reforms the communication path to the communication partner of the telephone line A3 and transmits the incoming call display sound to the receiving terminal 1 such as the telephone number. In the receiving terminal 1 such as a telephone number, the sequence ST4
The telephone number or the like received in step 1 is displayed or notified by voice, and the user of the receiving terminal 1 such as the telephone number assists in determining whether or not to respond to the interruption person.

FIG. 2 shows a schematic electrical configuration of a telephone number receiving terminal device 5 connected to the telephone number receiving terminal 1 of FIG. A telephone line 6 is provided in the telephone subscriber line exchange 2 of FIG.
The telephone line interface 7 is connected via. The call line interface 7 is connected to a CPU 8 that controls the whole. Communication with the receiving terminal device 5 such as a telephone number is performed using the handset 9. The handset 9 includes a handset 10 that acoustically outputs a received signal and a handset 11 that electrically outputs a signal to be transmitted.
The handset 9 of the handset 9 is connected to the telephone number receiving terminal device 5 of the present embodiment so as to enable hands-free communication.
Separately, a microphone 12 is provided. Volumes reproduced by the transmitter 11 and the microphone 12 can be adjusted by volume control circuits 13 and 14, respectively. The transmitter 11 when using the handset 9 and the microphone 12 when performing hands-free communication can be switched by the switch 15.

The information reception terminal activation sound sent via the telephone line 6 is received by the activation sound reception circuit 16. The echo canceller 17 suppresses the transmission sound of the communication person from leaking to the reception sound side. The telephone number notification device 18 outputs a display sound of the calling party telephone number of the sender information.

The telephone line interface 7 and the handset 10 of the handset 9 are connected by a receiving system signal line 19. The input side of the activation sound receiving circuit 16 is also connected to the reception 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 transmitting system signal line 20. An echo canceller 17 is connected between the receiving system signal line 19 and the transmitting system signal line 20.

When an information receiving terminal activation indicating the start of transmission of a telephone number or the like from the telephone subscriber line exchange 2 is input to the communication line interface 7 via the telephone line 6, the reception system signal A21 is used as a reception system signal A21. It is input to the startup sound receiving circuit 16 via the signal line 19. Handset 9 transmitter 11
The voice input to the microphone 12 during the hands-free operation is transmitted to the echo canceller 17 and the communication line interface 7 as the transmission system signal 22 via the transmission system signal line 20. The echo canceller 17 estimates the sidetone 23 from the transmitting system signal 22 and synthesizes it with the receiving system signal A21 to generate a receiving system signal B24.

FIG. 3 shows a receiving terminal device 5 for receiving telephone numbers and the like in FIG.
Shows a control procedure for receiving caller information from a third party during a call. When communication is being performed with the communication partner of the telephone line A3 shown in FIG. 1 in step s1, if an incoming call display sound from the telephone subscriber line exchange 2 is received in step s2, step s3
Move to. In step s3, the suppressing operation is performed. In the suppressing operation, the CPU 8 controls the echo canceller 17 to reduce and suppress the output level of the side sound 23. If the control for the echo canceller 17 and the control for the volume adjusting circuits 13 and 14 are used together, the side sound 23 can be suppressed more reliably. If the sidetone is suppressed in step s3, even if the user of the receiving terminal device 5 such as a telephone number inputs a voice into the transmitter 11 or the microphone 12, the influence of the sidetone 23 on the reception system signal B24 is reduced. The start-up sound receiving circuit 16 can receive the receiving system signal B24 and the receiving system signal A21.

When the activation sound receiving circuit 16 of FIG. 2 receives the activation sound of the information receiving terminal, it starts control for informing the telephone number of the caller by the telephone number informing device 18 via the CPU 8. As shown in sequence ST4 of FIG. 1, when the caller information such as a telephone number is received as a modem signal, the CPU 8 receives the caller information via the telephone line interface 7, and the received caller information is notified by the telephone number notification device 18 To inform you.
When the notification of the caller information in step s5 is completed from the reception of the caller information in step s4, it waits for the incoming call display sound indicating the end of the notification of the caller information to be notified in step s6. When the incoming call display sound is received in step s6, the echo canceller 17 or the volume adjusting circuits 13 and 14 are received in step s7.
The side tone suppression by the control of 1 is released, and the process returns to step s1 to continue the original communication.

In this embodiment, when there is an incoming call from a third party during communication and a signal of the information receiving terminal activation sound is received from the telephone subscriber line exchange 2 for notifying the third party's telephone number. , The telephone number of the third party's telephone number can be improved even if the user of the receiving terminal device 5 is transmitting without paying attention to its reception, because the accuracy of detecting the information receiving terminal starting sound can be improved. It is possible to reliably notify such as.

[0024]

As described above, according to the present invention, while the caller information is being received, the side tone due to the transmission sound is suppressed to accurately receive the caller information, and the third party can be easily identified. It becomes possible to do.

[0025]

Further, according to the present invention, after the sidetone is suppressed for receiving the sender information, the suppression is released when the notification of the sender information is completed, so that the original state can be restored. .

Further, according to the present invention, the incoming call display sound sent from the communication network is detected before and after the notification of the caller information, and the side tone suppression is started and canceled. It is possible to surely suppress the sidetone during.

[Brief description of drawings]

FIG. 1 is a connection sequence diagram showing a process in which caller information is notified from a communication network in an embodiment of the present invention.

2 is a block diagram showing a schematic electrical configuration of a telephone number receiving terminal device 1 of FIG.

FIG. 3 is a flowchart showing an operation of the telephone number receiving terminal device 1 of FIG.

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

[Explanation of symbols]

Receiving terminal such as 1 telephone numbers 2 Telephone subscriber line switch 3 telephone lines A 4 telephone line B 5 Receiving terminal devices such as telephone numbers 6 telephone lines 7 Communication line interface 8 CPU 9 handsets 10 handset 11 transmitter 12 microphones 13, 14 Volume control circuit 15 switch 16 Start-up receiver circuit 17 Echo canceller 18 Telephone number notification device 19 Incoming signal line 20 Speaking system signal line 21 Incoming signal A 22 Spoken signals 23 Sidetone 24 Incoming signal B

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04M 1/00 H04M 1/57 H04M 3/42

Claims (3)

(57) [Claims] 1. A communication terminal device capable of performing full-duplex communication, being connected to a communication network capable of notifying caller information such as a calling party telephone number, and being capable of notifying caller information sent from the communication network. When there is communication from a third party during communication, the detection means that detects the start of notification from the communication network and the sidetone that causes the transmitted sound to leak to the receiving side are estimated, and the estimated sidetone is output. An echo canceller capable of adding a transmitting system signal to a receiving system signal so as to turn it off, and a suppressing unit for controlling the echo canceller to suppress sidetone when the detecting unit detects the notification. A communication terminal device. 2. The communication terminal device according to claim 1, further comprising a canceling unit that detects the end of the notification of the caller information and cancels the suppression of the sidetone by the suppressing unit. 3. The detecting means and the canceling means respectively detect an incoming call display sound sent from the communication network before and after the notification of the caller information as a start and an end of the notification from the communication network. The communication terminal device according to claim 2, wherein