JPH11225162A - Speech system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure excellent sound quality even in the case that data delay and missing data frequently take place due to congestion or deteriorated quality of a computer network in the case of using the computer network for the system. SOLUTION: A voice data control means 203 has a function that duplicates part of voice data with a time length decided between terminals among voice data to be sent and transmits the duplicated data during a speech between the terminals. Thus, the effect of missing data is reduced in the case that missing data take place and voice data close to an original voice are decoded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preferred communication system for transmitting and receiving voice data using a computer network.

[0002]

2. Description of the Related Art Conventionally, a communication system using a computer network is disclosed in Japanese Patent Application Laid-Open No. 9-172462. FIG. 11 shows the configuration of the communication system. 1101 is a computer network. 1102 is a computer network. 1103 is a router. 1104 is a router. Each computer network 1101, 1102
Each have a plurality of terminals. The terminals in each of the computer networks 1001 and 1002 are connected by a LAN (Local Area Network). Each computer network 1001, 1002
Are connected via routers 1003 and 1004 to form a computer network. Such a computer network is called the Internet, and terminals in each computer network can communicate with terminals in other computer networks. In the Internet, TCP (Transmission Control Protocol) is used as a transport layer protocol.
rotocl) and UDP (User Datagram Protocol). TCP is a protocol for performing connection-type communication, and has a function of performing packet order control, retransmission, flow control, and congestion control. UDP is a protocol for performing connectionless communication, and is used in cases where real-time performance is required rather than increasing delay by retransmitting lost data, such as an Internet telephone. In the Internet, Ethernet is often used as a protocol of a link layer and a physical layer. Ethernet is a bandwidth sharing type protocol,
While one terminal uses a computer network and performs communication, other terminals connected to the same computer network cannot use the computer network.

[0003]

In the communication system using the computer network, a bandwidth sharing type protocol is used. Therefore, when a large number of terminals attempt to communicate at the same time, the traffic of the computer network is reduced. There is a problem that communication quality deteriorates due to congestion and frequent occurrence of data delay or loss.

[0004] It is an object of the present invention to provide a communication system which ensures good voice quality when the traffic of a computer network is congested and data delay or loss frequently occurs.

[0005]

In order to solve this problem, the present invention firstly provides a computer network,
A communication system comprising a plurality of terminals connected to the computer network, wherein each of the terminals shares a band of the computer network and performs a call by transmitting and receiving voice data. Means and voice data control means for packetizing input voice with a predetermined time length between terminals and partially duplicating the packetized voice data and transmitting it to a computer network.

[0006] This has the effect of reducing the effect of the loss when audio data is lost, and restoring audio data close to the original audio.

Second, the voice data control means converts the n-th voice and the (n + 1) -th voice obtained from the voice input means into the n-th voice.
The first half of the audio and the first half of the (n + 1) th audio are packetized as the n-th audio data, and the second half of the n-th audio and the second half of the (n + 1) th audio are packetized as the (n + 1) th audio data. The audio data and the (n + 1) th audio data are transmitted to the computer network control means.

[0008] Thus, when audio data is lost, the continuous loss time can be reduced, and the effect of restoring audio data close to the original audio can be obtained.

Third, the voice data control means, when packetizing the voice obtained from the voice input means, inserts the elapsed time from the start of the call at the head of the voice and transmits it as voice data to the computer network. When the input level of the voice acquired from the voice input means is equal to or less than a certain threshold value, it is determined that there is no sound, and the voice data is not transmitted to the computer network.

[0010] Thus, the voice data control means of the receiving terminal can discriminate and control loss, delay, and silence of the received voice packet, and can reduce the amount of data to be transmitted and received. Is obtained.

Fourth, the voice data control means monitors the loss rate of the received voice data, and when the loss rate of the received voice data reaches a certain threshold or more, the computer network becomes congested. It is characterized in that it is determined that the audio data is transmitted, the size of the audio data to be transmitted per packet is reduced, and the audio data is transmitted. As a result, it is possible to reduce the influence of loss when audio data is lost, and to restore audio data close to the original audio.

Fifthly, the terminal further comprises a hold managing means for notifying the terminal of the other party of the hold when the caller terminal puts the call on hold during the call, and stopping the transmission of the voice data after notifying the hold. It is characterized by having. As a result, silence data is not transmitted when the conversation is interrupted, and an effect of reducing traffic congestion in the computer network can be obtained.

Sixthly, the terminal monitors the loss rate of the received voice data by the voice data control means, and when the loss rate of the received voice data reaches a certain threshold or more, the computer network becomes congested. If it is determined that it is connected to the telephone network, it sends a request to change the telephone network and notifies its own telephone number to the voice data control means of the partner terminal, and then receives the telephone number of the partner terminal. Along with
It further comprises a telephone network connection means for storing the telephone number of the communication partner terminal, and rejects incoming calls from other than the telephone number of the communication partner terminal.

Thus, even if a large number of voice data is lost due to traffic congestion in the computer network and the voice quality is reduced to such an extent that a call cannot be made,
The effect is obtained that the telephone line can be switched to the telephone network without fail.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a call system using the present invention. In FIG. 1, reference numeral 101 denotes a first terminal used for a call. Reference numeral 102 denotes a second terminal used for a call. 103 is a computer network. FIG. 2 shows a configuration of a terminal used in the present call system. In FIG. 2, reference numeral 201 denotes a voice input unit such as a microphone used for a call. Reference numeral 202 denotes an audio output unit such as a speaker that outputs the voice of the other party. Reference numeral 203 denotes an audio data control unit that converts audio into audio data when transmitting audio data, and converts audio data into audio when receiving audio data. Reference numeral 204 denotes a computer network connection unit for connecting to a computer network.

The operation of the communication system configured as described above will be described below. First, referring to FIG. 2, a first terminal 101 and a second terminal
The operation of the terminal will be described. When transmitting voice data in a call, voice data obtained from voice input means 201 is packetized by voice data control means 203 with a time length determined between first terminal 101 and second terminal 102, and transmitted voice data is transmitted. After that, it is transmitted to the computer network connection means 204. The computer network connection means 204 converts the transmission voice data received from the voice data control means 203 into a computer network communication packet such as UDP / IP and sends the packet to the computer network 103. At the time of receiving the audio data, the computer connection means 204 receives the computer network communication packet from the computer network 103, converts it into the received audio data, and transmits it to the audio data control means. The voice data control means converts the received voice data into voice, and then outputs
To output audio.

Next, the first terminal 1 will be described with reference to FIGS.
The audio data communicated between the first terminal 102 and the second terminal 102 will be described.

FIG. 3 shows a voice transmitted from the voice input means 201 to the voice data control means 203.
This is the first voice transmitted from the voice input unit 201 to the voice data control unit 202 at an arbitrary time. Reference numeral 302 denotes a second voice transmitted from the voice input unit 201 to the voice data control unit 203 after the first voice 301. Hereinafter, the third voice and the fourth voice follow.

FIG. 4 shows transmission voice data transmitted from the voice data control means 203 to the computer network control means 204. Reference numeral 401 denotes a transmission voice data transmitted from the voice data control means 203 to the computer network connection means 204 at an arbitrary time. This is the converted first audio data.
Reference numeral 402 denotes converted second audio data transmitted from the audio data control unit 203 to the computer network connection unit 204 after the converted first audio data 401.
Reference numeral 403 denotes converted third audio data transmitted from the audio data control unit 203 to the computer network connection unit 204 after the converted second audio data 402.
Hereinafter, the fourth audio data after the conversion and the fifth audio data after the conversion follow. During a call between the first terminal 101 and the second terminal 102, that is, when transmitting and receiving voice data, the voice obtained by the voice input means 201 is the first voice (the n-th voice according to claim 3). , The second voice (the n + th voice according to the third aspect)
(1 voice) in this order. The voice data control means 203 includes a voice input means 201
The received voice is packetized as it is, without changing the first voice 301, and converted as the first voice data 401 into the computer network connection unit 20.
Send to 4. After transmitting the converted first voice data 401 to the computer network connection means 204, the voice data control means 203 transmits the second half of the first voice 301 and the first half of the second voice 302 as the second voice data. , Into a packet and send it to the computer network connection means 204 as the converted second audio data 402. Further, the converted third audio data 403 is
The latter half of the voice 302 and the former half of the third voice are transmitted, and the same operation is repeated thereafter. As described above, the voice input means 20
The second half of each voice transmitted from 1 to the voice data control means 203 is duplicated and transmitted from the voice data control means 203 to the computer network connection means 204. In the terminal on the receiving side, the audio data control unit 203 removes the duplicated portion of the partially duplicated audio data received by the computer network connection unit 204 and sends it to the audio output unit 202. When the audio data is lost on the computer network 103, the audio data control unit 203 can complement the lost audio data by transmitting the next arrival audio data to the audio output unit 202 as it is.

As described above, in the present embodiment, the audio data control means 203 reduces the effect of loss when audio data is lost by duplicating a part of the audio data to be transmitted, and Close audio data can be restored.

In the present embodiment, the communication system has two terminals, but it can be easily realized with three or more terminals.

(Embodiment 2) First, referring to FIG.
The audio data communicated between the first terminal 101 and the second terminal 102 will be described. FIG. 5 shows the voice input means 20.
1 shows the voice transmitted from the voice data control means 203 to the voice data control means 203 and the voice data transmitted from the voice data control means 203 to the computer network control means 204.
01 is a first voice (an n-th voice according to claim 4) which is a voice transmitted from the voice input means 201 to the voice data control means 203 at an arbitrary time. Reference numeral 502 denotes a second voice (the (n + 1) th voice according to claim 4) transmitted from the voice input means 201 to the voice data control means 203 after the first voice 501. Hereinafter, the third voice and the fourth voice follow. Reference numeral 503 denotes an audio data control unit 20 at any time.
3 is the converted first audio data, which is the audio data transmitted to the computer network connection means 204 from No.3. Reference numeral 504 denotes second converted audio data transmitted from the audio data control unit 203 to the computer network connection unit 204 after the first converted audio 503. Hereinafter, the third audio data after conversion and the fourth audio data after conversion follow. During a call between the first terminal 101 and the second terminal 102, that is, when transmitting and receiving voice data, the voice data control unit 203 receives the first half of the first voice 501 and the second voice received from the voice input unit 201. The first half of the second audio 502 is packetized as first audio data 501 after conversion,
This is transmitted to the computer network connection means 204.
Next, the audio data control unit 203 packetizes the second half of the first audio 501 and the second half of the second audio 502 as converted second audio data 504, and transmits the converted second audio data 504 to the computer network connection unit 204. Hereinafter, the same operation is repeated. The receiving terminal receives the converted first audio data 503 and the converted second audio data 504 in this order by the computer network connection unit 204, and then the converted one audio data 503 by the audio data control unit 203. The first half of the converted second audio data 504 as the first audio, the second half of the converted first audio data 503 and the second half of the converted second audio data 504 as the second audio, 202. When the second audio data 504 is lost on the computer network, and when the audio data operation is not performed by the audio data control unit 203, the audio length of the second audio 502 is continuously lost. On the other hand, when the voice data operation according to the present invention is performed, the lost voice data is the first voice 50.
1 and the second half of the second voice 502, and the continuously lost voice is 欠 損 of the voice length. Therefore, it is possible to shorten the continuous interpolation time when performing the interpolation of the lost audio data, and it is possible to restore the audio data close to the original audio.

As described above, in this embodiment, the voice data control means 203 converts the first voice and the second voice acquired from the voice input means 201 into the first half of the first voice 501 and the second voice 502. Into a set of the first half of the first voice 501 and a set of the second half of the first voice 501 and the second half of the second voice 502, and a set of the first half of the first voice 501 and the first half of the second voice 502,
The audio data is sent to the computer network 103 in the order of the set of the latter half of the first audio 501 and the latter half of the second audio 502.
By providing the function of transmitting audio data, it is possible to reduce the continuous loss time when audio data is lost, and to restore audio data close to the original audio.

(Embodiment 3) First, audio data communicated between the first terminal 101 and the second terminal 102 will be described with reference to FIG. FIG. 6 shows the voice transmitted from the voice input means to the voice data control means and the voice data transmitted from the voice data control means to the computer network connection means.
The converted first audio data is audio data transmitted from the audio data control unit 203 to the computer network connection unit 204. Reference numeral 602 denotes converted second audio data transmitted from the audio data control unit 203 to the computer network connection unit 204 after the converted first audio data 601. Hereinafter, the third audio data after conversion and the fourth audio data after conversion follow. Reference numeral 603 denotes the elapsed time from the start of the call, which is assigned by the voice data control unit 203. A first voice 604 is a voice transmitted from the voice input unit 201 to the voice data control unit 203 at an arbitrary time. Reference numeral 605 denotes the elapsed time from the start of the call given by the voice data control unit 203. 606 is a voice input unit 2 next to the first voice 604.
01 is the second voice transmitted to the voice data control means 203. Between the first terminal 101 and the second terminal 102,
During a call, that is, when transmitting and receiving voice data, the voice data control unit 203 sets the time 6 since the start of the call before the first voice 604 received from the voice input unit 201.
03 is transmitted to the computer network connection means 204 as converted first audio data. At the start of a call, zero is inserted into the elapsed time. Next, before the second voice 606 received from the voice input unit 201, the elapsed time 605 from the start of the call is converted as the second voice data 602 after conversion.
Is inserted and transmitted to the computer network connection means 204. Hereinafter, the third audio data after conversion and the fourth audio data after conversion follow. Also, the audio data control means 203
If the level of the sound received from the sound input means 201 is equal to or less than a certain threshold, it is determined that there is no sound, and no sound data is sent to the computer network connection means 204. Thereafter, when the level of the voice received from the voice input means 201 exceeds a certain threshold value, it is determined that the voice has been input, and the elapsed time from the start of the call including the silent time before the received voice is included. The time is inserted, packetized, and transmitted to the computer network connection means 204. At the receiving terminal, the voice data control means 203 monitors the elapsed time from the start of the call. If there is no loss of audio data on the computer network 103, the elapsed time included in the received audio data is added from the zero to the audio time per audio data packet in order from zero. When data loss occurs on the computer network 103, the elapsed time received by the audio data control means 203 may indicate an increase of one audio data time or more compared to the elapsed time of the previously received audio data. Can be detected. At this time, the audio data control unit 203 determines that audio data has been lost on the computer network 103, interpolates the missing data portion based on the audio data received up to the previous time, and transmits the data to the audio output unit 202. . If the sound data loss continues continuously for a certain threshold or more, the sound data control means 203
Determines that silence has occurred, and transmits silence to the audio output means 202 without performing interpolation of the audio data.

As described above, in the present embodiment, the voice data control means 203 inserts the elapsed time from the start of the call at the beginning of the voice obtained from the voice input means 201,
Packetized and transmitted to the computer network 103, and the audio data control means 203
When the input level of the voice obtained from the voice data 01 is lower than a certain threshold value, the voice data is determined to be silent, and the voice data is not transmitted to the computer network 103. In addition, it is possible to distinguish and control loss, delay, and silence of received audio data, and to reduce the amount of data to be transmitted and received.

In the present embodiment, the elapsed time from the start of the call is used. However, the present invention can be easily realized by using another identifier instead of the elapsed time.

(Embodiment 4) First, audio data communicated between the first terminal 101 and the second terminal 102 will be described with reference to FIG.

FIG. 7 shows the received voice data transmitted from the computer network connection means 204 to the voice data control means 203 and the transmission voice data transmitted from the voice data control means 203 to the computer network connection means 204. At any time, the computer network connection means 204 sends the voice data control means 2
03 is the received first audio data, which is the audio data transmitted to the receiver 03. Reference numeral 702 denotes received second audio data transmitted from the computer network connection unit 204 to the audio data control unit 203 next to the received first audio data. Hereinafter, the third received voice data and the fourth received voice data follow. Reference numeral 703 denotes an audio data control unit 2 at an arbitrary time.
03 is the transmission first audio data, which is the transmission audio data transmitted from 03 to the computer network connection means 204. Reference numeral 704 denotes transmission second audio data transmitted from the audio data control means 203 to the computer network connection means 204 following the transmission first audio data 703. Hereinafter, transmission third audio data and transmission fourth audio data follow. Reference numeral 705 denotes the first audio data to be transmitted to the computer network connection unit after the audio data control unit 203 packetizes the audio when the audio data loss rate becomes equal to or more than a certain threshold value. This is the converted first voice data to be transmitted. Reference numeral 706 denotes second transmitted second voice data transmitted from the voice data control unit 203 to the computer network connection unit 204 after the first voice data after conversion 705. Hereinafter, the third transmission after conversion
This is followed by the audio data and the fourth audio data after conversion. During a call between the first terminal 101 and the second terminal 102, that is, when transmitting and receiving voice data, the voice data control means 2
03 monitors the loss rate of voice data packets received from the other party. The defect rate is represented by the following equation.

Loss rate = (Number of lost voice data)
/ (The number of all audio data to be received) When the loss rate of the received audio data is equal to or less than a certain threshold value, the audio data control unit 203 sets the transmission 1 audio data 703,
The audio data is continuously transmitted to the computer network connection means 204 in the order of the transmission second audio data 704.
When the loss rate of the received voice data reaches a certain threshold value or more, the voice data control means 203 indicates that the computer network 103 is congested or some trouble has occurred due to a problem such as the quality of the network. Then, the size of the audio data to be transmitted per packet is reduced, and the converted audio data is transmitted to the computer network connection means 204 in the order of the third audio data after transmission and the fourth audio data after transmission. As a result, the audio time length per packet included in the audio data to be transmitted is shortened. Therefore, even if an audio data packet is lost on the computer network 103, the audio data lost due to the loss can be reduced. .

As described above, in the present embodiment, the voice data control means 203 monitors the loss rate of the received voice data, and the loss rate of the received voice data reaches a certain threshold or more. Sometimes computer network 103
Is judged to be congested, and the function of reducing the size of one packet of transmitted audio data per packet is provided, thereby reducing the effect of the loss when the audio data is lost, and reducing the audio data close to the original audio. Can be restored.

(Embodiment 5) FIG. 8 shows a terminal using the communication system according to the first embodiment.
Reference numeral 1 denotes voice input means such as a microphone used for a telephone call.
Reference numeral 802 denotes an audio output unit such as a speaker that outputs the voice of the other party. Reference numeral 803 denotes a hold management unit that performs hold control with the communication partner terminal. Reference numeral 804 denotes an audio data control unit that converts audio into audio data when transmitting audio data, and converts audio data into audio when receiving audio data. Reference numeral 805 denotes a computer network connection unit that connects to a computer network.

The operation of the communication system configured as described above will be described below. When the conversation is interrupted between the first terminal 101 and the second terminal 102, that is, when the voice data is transmitted and received, that is, when the hold is performed, the hold management unit 803 transmits the data via the computer network connection unit 805, A hold notification is sent to the second terminal. After performing the suspension notification, the suspension management unit 803
A sound to be held is transmitted to the sound output means 802, the sound received from the sound input means 801 is discarded, and the sound transmission to the sound data control means 804 is interrupted. Second
In the terminal, after the voice packet hold management unit 804 receives the hold notification, it performs the same operation as the above operation,
Suspend audio data output to the computer network. As a result, the hold is determined, and no voice data is communicated on the computer network during the hold.
As described above, in the present embodiment, the hold management unit 80
3 has a function of notifying the hold management unit 803 of the communication partner terminal of a hold notification and notifying the hold and then stopping the transmission of the voice data. The effect of reducing the congestion of the network traffic 103 can be obtained.

(Embodiment 6) FIG. 9 shows a terminal using the telephone communication system according to the first embodiment.
Reference numeral 1 denotes voice input means such as a microphone used for a telephone call.
Reference numeral 902 denotes an audio output unit such as a speaker that outputs the voice of the other party. Reference numeral 903 denotes a voice data control unit that converts voice to voice data when transmitting voice data, and converts voice data to voice when receiving voice data. 9
Reference numeral 04 denotes a telephone line network connection unit for connecting to a telephone network.
Reference numeral 905 denotes a computer network connection unit that connects to a computer network.

The operation of the communication system configured as described above will be described below. First, a data structure of a call network change request and a call network change request response communicated between call terminals will be described with reference to FIG. FIG. 10 shows a data structure of a communication network change notification and a communication network change notification response communicated between the communication terminals, and reference numeral 1001 denotes a control type field indicating control data. 1002 is
This is a control code field for inserting a command content.
Reference numeral 1003 denotes a change destination own number indicating the own telephone number or IP address of the change destination.

During a call between the first terminal 101 and the second terminal 102, that is, when transmitting and receiving voice data, the voice data control means 903 monitors the loss rate of the voice data received from the second terminal 102. ing. The defect rate is represented by the following equation. Loss rate = (number of lost voice data) / (number of all voice data to be received) When the loss rate of received voice data is below a certain threshold, voice packet control procedure is 903, computer network connection The transmission of the audio data to the means 904 is continued. When the loss rate of the received voice data reaches a certain threshold or more, the voice data control unit 903 determines that the computer network 103 is congested or that some trouble occurs due to a problem such as the quality of the network. The computer network connection means 90
5, a call network change request is issued to the second terminal 102 to change the call path. The call network change request is performed by inserting a call network change request identifier into the control code field 1002 and transmitting it to the second terminal 102. When making the call network change request, the voice data control means 903 of the first terminal 101 also transmits the call path change destination telephone number by inserting the call path change destination own telephone number into the change destination own number 1003. I do. The voice data control means 903 of the second terminal 102 that has received the call network change request
A response to the call network change request is returned to the terminal 101. The response to the call network change request includes a control code field 100.
2 is inserted into the first terminal 1
01 is transmitted. When making the call network change request, the voice data control means 9 of the second terminal 102
No. 03 also transmits the telephone number of the call path change destination by inserting the telephone number of the call path change destination into the change destination own number 1003. First terminal 10 that has received the call network change request response
The first voice data control unit 903 notifies the telephone network connection unit 904 of the first terminal of the change destination own number of the second terminal 102 included in the response to the call network change request. First
The telephone network connection means 904 of the terminal 101 is the second terminal 1
02 is stored. When a call is made to the telephone network connection means 904 of the first terminal 101, the first
The telephone line network connection means 904 of the terminal specifies a caller using a caller number identification function. If the caller is different from the stored destination number, the telephone network connection means 904 of the first terminal 101 rejects the incoming call. If the number matches the number stored by the caller, the telephone network connection means 904 of the first terminal 101 responds to the incoming call and connects the line. After the line connection, the first terminal 101 and the second terminal 102
The telephone network connection means 904 of the audio data control means 9
03 is notified of the line connection. After receiving the line connection notification, the voice data control unit 903 changes all voice data communication from the computer network to the telephone network.

As described above, in the present embodiment, the voice data control means 903 monitors the loss rate of the received voice data, and the loss rate of the received voice data reaches a certain threshold or more. At this time, it is determined that the computer network 103 is congested, and after making a call network change request and notifying its own telephone number to the voice data control means 903 of the call partner terminal, the telephone number of the call partner terminal is received. In addition, the computer network 103 has a function of storing the telephone number of the other terminal in the telephone line network connection means 904 and rejecting an incoming call from a telephone number other than the stored telephone number.
Even if a large amount of voice data is lost due to the traffic congestion and the voice quality is reduced to such an extent that communication is impossible, the communication line can be switched to the telephone network without fail.

In this embodiment, the second terminal transmits to the first terminal when the communication line is changed. However, the first terminal can transmit to the second terminal. Can be realized.

[0039]

As described above, according to the present invention, first, the voice data control means duplicates a part of the voice data to be transmitted, thereby reducing the influence of the loss when the voice data is lost, Audio data close to the original audio can be restored.

Second, the voice data control means obtains the n-th voice and the (n + 1) -th voice obtained from the voice input means, as a set of the first half of the n-th voice and the first half of the (n + 1) -th voice, and the second half of the (n + 1) -th voice. Packetized into a set of the first half of the n-th voice and the first half of the (n + 1) -th voice, and the voice data as a set of the second half of the n-th voice and the second half of the (n + 1) -th voice. By transmitting the data to the computer network, the continuous loss time can be reduced when audio data is lost, and audio data close to the original audio can be restored.

Third, the voice data control means inserts the elapsed time from the start of the call at the beginning of the voice obtained from the voice input means, packetizes the packet, transmits the packet to the computer network, and the voice data control means When the input level of the voice acquired from the voice input means is equal to or less than a certain threshold, it is determined that there is no sound, and by providing a function of not transmitting voice data to the computer network,
The voice data control means on the receiving side can discriminate and control loss, delay, and silence of the received voice packet, and can also reduce the amount of data to be transmitted and received. Monitor the loss rate of the received voice data, and when the loss rate of the received voice data reaches a certain threshold or more, determine that the computer network is congested and transmit one packet of the voice data to be transmitted. By providing a function of transmitting with a reduced hit size, it is possible to reduce the influence of loss when audio data is lost and to restore audio data close to the original audio.

Fifth, the hold management means has a function of notifying the hold management means of the communication partner terminal of the hold, notifying the hold, and stopping the transmission of the voice data after the hold is notified. , And congestion of traffic on the computer network can be reduced.

Sixth, the voice data control means monitors the loss rate of the received voice data, and when the loss rate of the received voice data reaches a certain threshold or more, the computer network is congested. And sends a call network change request and a notification of the own telephone number to the voice data control means of the call partner terminal, receives the telephone number of the call partner terminal, and sends the telephone line connection means to the telephone line network connection means. By having a function to store numbers and reject incoming calls from other than the stored phone number, even if the voice quality is reduced to the extent that voice data is lost due to traffic congestion in the computer network and many voices are lost, Thus, the telephone line can be switched to the telephone network without fail.

[Brief description of the drawings]

FIG. 1 is a diagram of a call system using the present invention.

FIG. 2 is a configuration diagram of a terminal according to the first embodiment of the present invention.

FIG. 3 is an audio diagram transmitted from the audio input unit to the audio data control unit according to the first embodiment of the present invention;

FIG. 4 is an audio data diagram transmitted from the audio data control means to the computer network control means in the first embodiment of the present invention.

FIG. 5 is a diagram showing a voice transmitted from the voice input unit to the voice data control unit and a voice data transmitted from the voice data control unit to the computer network control unit according to the second embodiment of the present invention;

FIG. 6 is a diagram showing audio data transmitted from the audio input unit to the audio data control unit and audio data transmitted from the audio data control unit to the computer network connection unit according to the third embodiment of the present invention.

FIG. 7 is a diagram showing received voice data transmitted from a computer network connection unit to a voice data control unit and transmission voice data transmitted from a voice data control unit to a computer network connection unit according to a fourth embodiment of the present invention;

FIG. 8 is a configuration diagram of a terminal used in a call system according to a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram of a terminal used in a call system according to a sixth embodiment of the present invention.

FIG. 10 is a data configuration diagram of a call network change request and a call network change request response communicated between call terminals according to the sixth embodiment of the present invention.

FIG. 11 is a schematic diagram of a communication system using a computer network according to the related art of the present invention.

[Explanation of symbols]

 101 first terminal 102 second terminal 103 computer network 201 voice input means 202 voice output means 203 voice data control means 204 computer network connection means 301 first voice 302 second voice 401 converted first voice data 402 converted second voice Data 403 Converted third voice data 501 First voice 502 Second voice 503 Converted first voice data 504 Converted second voice data 601 Converted first voice data 602 Converted second voice data 603 Elapsed time 604 First Voice 605 Elapsed time 606 Second voice 701 Received first voice data 702 Received second voice data 703 Transmit first voice data 704 Transmit second voice data 705 Transmitted first voice data 706 Converted transmitted second voice data 801 Voice Input means 80 2 voice output means 803 hold sound management means 804 voice data control means 805 computer network connection means 901 voice input means 902 voice output means 903 voice data control means 904 telephone line network connection means 905 computer network connection means 1001 control type field 1002 control code Field 1003 Changed own number 1004 Other data 1101 Computer network 1102 Computer network 1103 Router 1104 Router

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Hamada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] A computer network; a plurality of terminals connected to the computer network;
A communication system in which each of the terminals shares a computer network band and communicates by transmitting and receiving voice data, wherein the terminal has voice input means for obtaining voice, and the input voice is transmitted between the terminals in advance. A voice data control means for packetizing the packetized voice data for the time length determined in the above and partially duplicating the packetized voice data and transmitting it to the computer network. 2. The communication system according to claim 1, wherein said voice data control means converts voice data obtained from a computer network into voice. 3. The voice data control means, when converting voice to voice data, sets a set of a first half of the n-th (n ≧ 1) voice and a second half of the n-th voice as the n-th voice data, The set of the second half of the n-th sound and the first half of the (n + 1) -th sound data is packetized as the (n + 1) -th sound data, so that the (n) -th sound and the (n + 1) -th sound are partially duplicated to form the n-th sound.
2. The communication system according to claim 1, wherein the voice data and the (n + 1) th voice data are transmitted to the computer network control means. 4. The voice data control means outputs the n-th (n ≧ 1) voice and the (n + 1) -th voice obtained from the voice input means as a set of the first half of the n-th voice and the first half of the (n + 1) -th voice. n audio data, and the latter half of the nth audio and the nth audio
The set of the latter half of the +1 audio is packetized as the (n + 1) th audio data, so that the nth audio data and the (n + 1) th audio data
2. The communication system according to claim 1, wherein the voice data is transmitted to a computer network control unit. 5. The voice data control means, when packetizing the voice obtained from the voice input means, inserts the elapsed time from the start of the call at the beginning of the voice and transmits the voice data to the computer network as voice data. The communication system according to claim 1, wherein: 6. The sound data control means judges that there is no sound when the input level of the sound acquired from the sound input means is equal to or less than a predetermined threshold value, and determines that the sound data is not transmitted to the computer network. Characteristic call system. 7. The voice data control means monitors a loss rate of received voice data, and when the loss rate of the received voice data reaches a certain threshold or more, the computer network becomes congested. And reduce the size of the voice data to be transmitted per packet,
The communication system according to claim 1, wherein the call is transmitted. 8. The terminal further comprises a hold management unit for notifying the terminal of the other party of the call when the caller terminal puts the call on hold during a call, and stopping the transmission of the voice data after notifying the hold. The communication system according to claim 1, wherein: 9. The terminal monitors the loss rate of the voice data received by the voice data control means, and when the loss rate of the received voice data reaches a certain threshold or more, the computer network becomes congested. If it is determined that the telephone network is connected to the telephone network, a request to change the telephone network and a notification of the own telephone number are made to the voice data control means of the other terminal, 2. The communication system according to claim 1, further comprising: a telephone network connection means for receiving the telephone number of the communication partner terminal and storing the telephone number of the communication partner terminal, and rejecting an incoming call other than the telephone number of the communication partner terminal. .