JP2008042354A - Communication terminal, communication method, and communication program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To output voice after outputting sound, indicating that the voice is to be output, with a timing at which it becomes possible to output the voice generated from a voice packet. <P>SOLUTION: The communication terminal for performing half-duplex communication of voice data comprises a receiving part for receiving the plurality of voice packets indicating the voice; a voice generating part for generating the voice from among the plurality of voice packets received by the reception part; a voice output possibility detection part for detecting that it has become possible to output the voice by generation of the voice by the voice generation part; a standby control part for making the communication terminal stand by, until the voice output possibility detection part detects that it has become possible to output the voice; a notification sound output part for outputting output notification sound, indicating that the voice is to be output, with at least the timing at which the voice output possibility detection part detects that it has become possible to output the voice; and a voice output part for outputting the voice, generated by the voice generation part after the notification sound output part, outputs the output notification sound. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication terminal, a communication method, and a communication program. In particular, the present invention relates to a communication terminal, a communication method, and a communication program that perform half-duplex communication of audio data by packet communication.

Patent Document 1 proposes a portable terminal device that can detect a voice uttered by a user and start a conversation using the P2T function in a Push-To-Talk (P2T) communication method. That is, in the portable terminal device described in Patent Document 1, when the control circuit unit recognizes that the voice is input from the microphone, the conversation authority acquisition request is transmitted to the P2T server to acquire the authority to perform the conversation. . Then, when the control circuit unit does not receive a voice from the microphone for a certain period of time, the portable terminal device transmits a conversation authority release request to the P2T server and releases the authority to converse.
JP 2006-101048 A

  Here, the P2T method is a communication method based on the VoIP exchange method, and is a method for exchanging packets. Therefore, the voice quality deteriorates due to the transmission delay and loss of the voice packet. In order to correct the transmission delay of the voice packet, a buffer process of the voice packet is usually performed. However, the invention disclosed in Patent Document 1 does not consider correction processing such as transmission delay. In addition, the influence of the delay from when the voice packet is received until the received voice packet is depacketized and the digitized voice data is output is not considered.

  Then, an object of this invention is to provide the communication terminal, the communication method, and communication program which can solve the said subject. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

  In order to solve the above-described problem, in the first embodiment of the present invention, a communication terminal that performs half-duplex communication of voice data by packet communication, a receiving unit that receives a plurality of voice packets indicating voice; An audio generation unit that generates audio from a plurality of audio packets received by the reception unit, an audio output enable detection unit that detects that audio can be output by generating audio, and audio output The standby control unit that waits for the communication terminal until the voice output enable detection unit detects that the voice output is possible, and at the timing when the voice output enable detection unit detects that the voice can be output. A notification sound output unit that outputs an output notification sound indicating that the sound is output, and a sound output unit that outputs the sound generated by the sound generation unit after the notification sound output unit outputs the output notification sound.

  The reception unit further includes a voice packet reception detection unit that detects reception of a predetermined voice packet among a plurality of voice packets received by the reception unit, and the notification sound output unit indicates that the predetermined voice packet has been received. A reception notification sound indicating that a predetermined voice packet has been received may be further output at a timing detected by the reception detection unit. Furthermore, the voice packet reception detection unit may detect that any one of the plurality of voice packets received by the reception unit is received first. The notification sound output unit receives the notification from the timing when the voice packet reception detection unit detects that the predetermined voice packet has been received to the timing when the voice output enable detection unit detects that the voice can be output. The sound and the output notification sound may be output continuously. Further, the reception notification sound and the output notification sound may be sounds having different frequencies.

  In addition, the audio generation unit temporarily stores a plurality of audio packets received by the reception unit by a predetermined number of packets, and a plurality of audio packets by a predetermined number of packets stored by the buffer processing unit. An audio data conversion unit that converts the packet into audio data, and the audio output enable detection unit, after the audio data conversion unit converts a predetermined number of packets among the plurality of audio packets received by the reception unit, When a predetermined time has elapsed, it may be detected that sound can be output.

  In addition, the voice generation unit detects an error in detecting a voice packet that is corrupted among a plurality of voice packets received by the reception unit or a voice packet that is lost in a plurality of voice packets that the reception unit should receive. A packet detection unit, and a retransmission request unit that requests retransmission of the voice packet detected by the error packet detection unit to a communication terminal that has transmitted a plurality of voice packets. After the reception unit receives the voice packet for which retransmission has been requested, the voice generation unit may detect that the voice can be output by generating the voice.

  Further, in the second embodiment of the present invention, a communication method for performing half-duplex communication of voice data by packet communication, the reception method receiving a plurality of voice packets indicating voice, and receiving in the reception stage A voice generation stage for generating voice from a plurality of voice packets, a voice output enabling detection stage for detecting that voice can be output by generating voice in the voice generation stage, and voice output enabled Voice is output at the timing at which the communication terminal waits until it is detected at the audio output enable detection stage and at the timing at which it is detected at the audio output enable detection stage that audio can be output at least. A notification sound output stage that outputs an output notification sound, and after the output notification sound is output in the notification sound output stage, And an audio output step of outputting a sound that is.

  According to the third aspect of the present invention, there is provided a communication program for a communication terminal that performs half-duplex communication of voice data by packet communication, and the reception unit receives a plurality of voice packets indicating voice. , An audio generation unit that generates audio from a plurality of audio packets received by the reception unit, an audio output enable detection unit that detects that audio can be output by generating audio, and can output audio The voice output is detected at the timing when the voice output detection unit detects that the voice can be output until the standby control unit that waits for the communication terminal until the voice output capability detection unit detects A notification sound output unit that outputs an output notification sound indicating that the sound is output, and the notification sound output unit functions as a sound output unit that outputs the sound generated by the sound generation unit after the output of the output notification sound. That.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  ADVANTAGE OF THE INVENTION According to this invention, the notification sound which shows that a sound is output can be output at the timing which became possible to output the audio | voice produced | generated from the audio | voice packet.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 shows an example of a functional configuration of a communication terminal 10 according to an embodiment of the present invention. The communication terminal 10 is, for example, a mobile phone having a function of performing half-duplex communication of audio data by packet communication. The communication terminal 10 may be a portable communication terminal such as a PDA having a function of performing half-duplex communication of audio data by packet communication. Further, the communication terminal 10 may be a personal computer connected to the network by wire and having a function of performing half-duplex communication of audio data by packet communication. An object of the communication terminal 10 according to the present embodiment is to output a notification sound indicating that a voice is to be output at the timing when it is detected that the voice is generated from the received voice packet and output is possible. .

  The communication terminal 10 according to the present embodiment includes a reception unit 100, a transmission unit 102, a voice generation unit 110, a voice packet reception detection unit 120, a standby control unit 130, a voice output enable detection unit 140, a voice output unit 150, and a notification sound output. A unit 152, a speaker 154, and an antenna 160 are provided. The audio generation unit 110 includes a buffer processing unit 112, an audio data conversion unit 114, an error packet detection unit 116, and a retransmission request unit 118.

  The receiving unit 100 receives a plurality of voice packets indicating voice transmitted by a communication terminal as a communication partner. Specifically, first, the communication terminal of the communication partner digitally encodes the voice data. Then, the communication terminal of the communication partner generates a plurality of voice packets from the digitally encoded voice data. Subsequently, the communication terminal of the communication partner transmits a plurality of voice packets to the communication terminal 10. And the receiving part 100 receives the several audio | voice packet which the communication terminal of the communicating party transmitted.

  For example, when the communication terminal 10 is a wireless communication terminal, the receiving unit 100 receives a voice packet from the communication terminal of a communication partner that performs half-duplex communication of voice data by packet communication via the antenna 160. When the communication terminal 10 is, for example, a personal computer, the receiving unit 100 may receive a voice packet from a communication terminal of a communication partner that performs half-duplex communication of voice data by wired packet communication. The receiving unit 100 supplies the received plurality of voice packets to the voice generation unit 110 and the voice packet reception detection unit 120.

  The transmission unit 102 transmits a plurality of voice packets to the communication terminal of the communication partner. Further, based on the control of the retransmission request unit 118, the transmission unit 102 transmits a signal requesting retransmission of the damaged voice packet and the lost voice packet to the communication terminal of the communication partner. For example, when the communication terminal 10 is a wireless communication terminal, the transmission unit 102 transmits a plurality of voice packets to the communication terminal of the communication partner via the antenna 160. When the communication terminal 10 is, for example, a personal computer, the transmission unit 102 may transmit a plurality of voice packets to a communication partner communication terminal via a wired network such as the Internet.

  The voice generation unit 110 generates voice from a plurality of voice packets received from the reception unit 100. That is, the voice generation unit 110 converts a plurality of voice packets into packets and takes out the digitally encoded voice data. Then, the sound generation unit 110 generates sound from the extracted digitally encoded sound data. In addition, the voice generation unit 110 analyzes each header of a plurality of voice packets received from the reception unit 100, performs buffer processing, retransmission processing of damaged voice packets, retransmission processing of voice packets lost during transmission, etc. do.

  Specifically, the buffer processing unit 112 temporarily stores a plurality of audio packets received from the receiving unit 100 by a predetermined number of packets. Note that the buffer processing unit 112 has a buffer for temporarily storing a predetermined number of voice packets. Subsequently, the buffer processing unit 112 analyzes respective headers (for example, RTP headers) of the plurality of voice packets, and obtains arrival time intervals that are times when the plurality of voice packets reach the receiving unit 100. Then, the buffer processing unit 112 adjusts the arrival time intervals between the plurality of packets at equal intervals. The buffer processing unit 112 supplies the plurality of voice packets after the arrival time interval is adjusted to the voice data conversion unit 114 by a predetermined number of voice packets.

  The audio data conversion unit 114 converts a plurality of audio packets received from the buffer processing unit 112 by a predetermined number into audio data. Specifically, the voice data conversion unit 114 converts a plurality of voice packets into reverse packets. Then, the audio data converter 114 converts the plurality of audio packets into digitally encoded audio data. The audio data conversion unit 114 supplies the audio data to the audio output unit 150.

  The error packet detector 116 detects a damaged voice packet among the plurality of voice packets received from the receiver 100. Further, the error packet detection unit 116 detects a lost voice packet among a plurality of voice packets to be received by the receiving unit 100. Specifically, the error packet detection unit 116 analyzes RTP headers of a plurality of voice packets received by the reception unit 100, respectively. Then, the error packet detection unit 116 detects the information of the lost voice packet and the information of the damaged voice packet. Subsequently, the error packet detection unit 116 supplies the retransmission request unit 118 with information on a voice packet that should be requested to be retransmitted from the detected information to the communication terminal of the communication partner.

  The retransmission request unit 118 requests the communication terminal that has transmitted a plurality of voice packets to retransmit the voice packet detected by the error packet detection unit 116. The retransmission request unit 118 requests a signal requesting retransmission together with information for identifying a voice packet to be requested for retransmission to the communication terminal of the communication partner via the transmission unit 102. For example, the retransmission request unit 118 is RTCP. Of the plurality of voice packets received by the communication terminal 10, information indicating the lost and damaged voice packets is fed back to the communication terminal of the communication partner, thereby requesting retransmission of the voice packets detected by the error packet detection unit 116. .

  The sound output possibility detection unit 140 detects that the sound can be output by the sound generation unit 110 generating sound. Specifically, the voice output possibility detection unit 140 has passed a predetermined time after the voice data conversion unit 114 converts a predetermined number of packets among the plurality of voice packets received by the reception unit 100. In this case, it is detected that the voice can be output.

  Further, the audio output enable detection unit 140 receives the audio packet requested to be retransmitted by the retransmission request unit 118, and then receives the audio by the audio data conversion unit 114 included in the audio generation unit 110 converting the audio. Detect that output is possible. The sound output possibility detection unit 140 supplies information indicating that sound can be output to the standby control unit 130 and the notification sound output unit 152. The standby control unit 130 causes the communication terminal 10 to wait until the voice output possibility detection unit 140 detects that the voice can be output. Specifically, the standby control unit 130 works on the voice output unit 150 to stop the voice output unit 150 from outputting voice, thereby causing the communication terminal 10 to wait.

  The voice packet reception detection unit 120 detects that a predetermined voice packet among a plurality of voice packets received by the reception unit 100 has been received. Specifically, the voice packet reception detection unit 120 detects that any one of a plurality of voice packets received by the reception unit 100 is received first. In addition, the voice packet reception detection unit 120 may detect that a predetermined number of voice packets have been received. The voice packet reception detection unit 120 supplies information indicating that a predetermined voice packet has been received to the notification sound output unit 152.

  The notification sound output unit 152 outputs a reception notification sound from the timing at which the voice packet reception detection unit 120 detects that a predetermined voice packet has been received until immediately before the voice output unit 150 outputs the voice data. Specifically, the notification sound output unit 152 changes the length of time for outputting the reception notification sound and outputs it. For example, the notification sound output unit 152 sets the time for outputting the reception notification sound from the timing at which the voice packet reception detection unit 120 detects that a predetermined voice packet has been received to just before the voice output unit 150 outputs the voice data. May be extended. Further, the notification sound output unit 152 may output the reception notification sound while changing the frequency of the reception notification sound when the time for outputting the reception notification sound is extended.

  The notification sound output unit 152 outputs an output notification sound indicating that the sound is to be output at least when the sound output possibility detection unit 140 detects that the sound can be output. Specifically, the notification sound output unit 152 outputs an output notification sound at the timing when the information indicating that the sound can be output is received from the sound output possibility detection unit 140. Here, the reception notification sound and the output notification sound are sounds having different frequencies. Further, the notification sound output unit 152 may continuously output the reception notification sound and the output notification sound. Further, the notification sound output unit 152 may intermittently output the reception notification sound until the output notification sound is output. The notification sound output unit 152 outputs a reception sound notification sound and an output notification sound from the speaker 154.

  The sound output unit 150 outputs the sound generated by the sound generation unit 110 after the notification sound output unit 152 outputs the output notification sound. The voice output unit 150 outputs the voice generated by the voice generation unit 110 after the standby control unit 130 cancels the standby of the communication terminal 10. Specifically, the audio output unit 150 outputs the audio data received from the audio data conversion unit 114 from the speaker 154 after the standby control unit 130 cancels standby for the communication terminal 10.

  According to the communication terminal 10 according to the present embodiment, a reception notification sound indicating that a voice packet has been received is received, the voice packet is received, and then the received voice packet is converted into voice data. You can output until just before output. As a result, the reception notification sound can be output from the time when the voice packet is received to the time when the voice data is output. Therefore, the psychological stress that the delay required for predetermined processing such as transmission delay and buffer processing is given to the user. Can be reduced.

  In addition, according to the communication terminal 10 according to the present embodiment, a reception notification sound indicating that a voice packet has been received is output, and further, an output notification sound indicating that a sound is output immediately before outputting the sound data is output. Can be output. As a result, even when the output of the voice data is delayed by the time required for the buffer processing of the voice packet, the voice data conversion processing, and the retransmission processing of the corrupted / lost packet, the user performs half-duplex communication without a sense of incongruity. be able to.

  FIG. 2 shows an example of an overview of the flow of processing in the communication terminal 10 according to the present embodiment. First, the communication terminal 10 (A) transmits a plurality of voice packets (for example, voice packets 202 to 204) of voice data as the original data 200 to the communication terminal 10 (B). Specifically, the communication terminal 10 (A) acquires the voice uttered by the user who uses the communication terminal 10 (A) and the voice of the environment around the communication terminal 10 (A). The communication terminal 10 (A) digitally encodes the acquired voice data. Subsequently, the communication terminal 10 (A) packetizes the digitally encoded audio data into a plurality of audio packets. Communication terminal 10 (A) transfers a plurality of voice packets to communication terminal 10 (B).

  The communication terminal 10 (B) receives a plurality of voice packets transferred by the communication terminal 10 (A). Here, the plurality of voice packets are delayed according to the transmission speed of the transmission path through which each voice packet passes before reaching the communication terminal 10 (B) (transmission delay 250). Since the transmission paths through which a plurality of voice packets pass are not necessarily the same, the arrival times until each voice packet reaches the communication terminal 10 (B) may be different. Therefore, the time interval between the plurality of voice packets when the communication terminal 10 (A) transfers the plurality of voice packets may not match the time interval between the plurality of voice packets received by the communication terminal 10 (B). is there.

  For example, as shown in the transmission data 220, intervals between a plurality of voice packets (for example, voice packets 202 to 204) are not equal. In addition, at least some of the plurality of voice packets may be damaged during transfer, resulting in a damaged packet 206. Furthermore, at least some of the plurality of voice packets transmitted by the communication terminal 10 (A) may be lost during transfer (for example, lost packet 208).

  Therefore, the communication terminal 10 (B) first temporarily stores the predetermined number of packets in the buffer 212. Subsequently, the buffer processing unit 112 adjusts the arrival time intervals between the plurality of voice packets stored in the buffer 212 to equal intervals. In addition, the communication terminal 10 (B) analyzes the headers of the plurality of received voice packets and requests the communication terminal 10 (A) to retransmit the damaged voice packet and the lost voice packet. After receiving the damaged voice packet and the lost voice packet from the communication terminal 10 (A), the communication terminal 10 (B) converts the plurality of voice packets into voice data (process 210). And the communication terminal 10 (B) outputs audio | voice data.

  Here, when the voice packet reception detection unit 120 included in the communication terminal 10 (B) detects that a predetermined voice packet, for example, one of a plurality of voice packets is first received, a notification sound output unit 152 outputs a reception notification sound (arrow 300). In addition, the notification sound output unit 152 can output a sound that the sound data conversion unit 114 has converted a predetermined number of packets into sound data and the converted sound data can be output from the sound output unit 150. An output notification sound is output at the timing detected by the detection unit 140, that is, immediately before the audio output unit 150 outputs the audio data (arrow 310).

  The notification sound output unit 152 continuously outputs the reception notification sound and the output notification sound at the timing indicated by the arrow 310 from the timing indicated by the arrow 300, for example. The notification sound output unit 152 may output the reception notification sound by extending the time for outputting the reception notification sound until the timing of the arrow 310. That is, the notification sound output unit 152 may continuously output the reception notification sound during the period 315. Note that the notification sound output unit 152 may intermittently output the reception notification sound during the period 315. Further, the notification sound output unit 152 varies the frequencies of the reception notification sound and the output notification sound. Thereby, the user can easily grasp the timing at which the audio data is output from the communication terminal 10 (B). Then, after the notification sound output unit 152 outputs the output notification sound, the sound output unit 150 outputs the sound generated by the sound generation unit 110 from, for example, the speaker 154.

  According to the communication terminal 10 according to the present embodiment, not only the reception notification sound indicating that a predetermined voice packet has been received but also the length of outputting the reception notification sound is set to buffer processing and damaged / erased packet retransmission. The time required for processing such as processing can be changed. And the output notification sound can be output at the timing of outputting the sound. As a result, the user can easily grasp the timing at which the voice is output, so the psychological stress felt by the user can be reduced even when the timing at which the voice is output is delayed by buffer processing for a plurality of voice packets. it can.

  FIG. 3 shows an example of the hardware configuration of the communication terminal 10 according to the present embodiment. The communication terminal 10 according to the present embodiment is connected to a CPU peripheral unit having a CPU 1000, a RAM 1020, a graphic controller 1075, and a display device 1080 that are connected to each other by a host controller 1082, and to the host controller 1082 by an input / output controller 1084. And an input / output unit having a communication interface 1030 and a ROM 1010. Here, the communication terminal 10 is, for example, a mobile phone. The communication terminal 10 may be a PDA or a digital camera having a communication function, or may be a personal computer. When the communication terminal 10 is a personal computer, the input / output unit further includes a hard disk drive and a CD-ROM drive. Furthermore, the input / output controller 1084 may be further connected to a flexible disk drive and a legacy input / output unit having an input / output chip.

  The host controller 1082 connects the RAM 1020 to the CPU 1000 and the graphic controller 1075 that access the RAM 1020 at a high transfer rate. The CPU 1000 operates based on programs stored in the ROM 1010 and the RAM 1020 to control each unit. The graphic controller 1075 acquires image data generated by the CPU 1000 or the like on a frame buffer provided in the RAM 1020 and displays it on the display device 1080. Instead of this, the graphic controller 1075 may include a frame buffer for storing image data generated by the CPU 1000 or the like.

  The input / output controller 1084 connects the host controller 1082 to the communication interface 1030, the hard disk drive, and the CD-ROM drive, which are relatively high-speed input / output devices. The communication interface 1030 communicates with other devices via a network. The hard disk drive stores programs and data used by the CPU 1000 in the communication terminal 10. The CD-ROM drive reads a program or data from the CD-ROM and provides it to the hard disk drive via the RAM 1020.

  The input / output controller 1084 is connected to a ROM 1010, a flexible disk drive, and an input / output chip having a relatively low speed. The ROM 1010 stores a boot program executed when the communication terminal 10 is started, a program depending on the hardware of the communication terminal 10, and the like. The flexible disk drive reads a program or data from a flexible disk and provides it to the hard disk drive via the RAM 1020. The input / output chip connects various input / output devices via a flexible disk drive, for example, a parallel port, a serial port, a keyboard port, a mouse port, and the like.

  A communication program provided to the hard disk drive via the RAM 1020 is stored in a recording medium such as a flexible disk, a CD-ROM, or an IC card and provided by the user. The communication program is read from the recording medium, installed on the hard disk drive in the communication terminal 10 via the RAM 1020, and executed by the CPU 1000. A communication program installed and executed on the communication terminal 10 works on the CPU 1000 or the like to make the communication terminal 10 the receiving unit 100, the transmitting unit 102, the voice generating unit 110, and the buffer processing unit 112 described with reference to FIGS. , Audio data conversion unit 114, error packet detection unit 116, retransmission request unit 118, audio packet reception detection unit 120, standby control unit 130, audio output enable detection unit 140, audio output unit 150, notification sound output unit 152, and speaker Function as 154.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

2 is a block diagram showing a functional configuration of a communication terminal 10. FIG. 3 is a diagram illustrating an outline of a process flow in a communication terminal 10. FIG. 2 is a block diagram illustrating a hardware configuration of a communication terminal 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Communication terminal 100 Reception part 102 Transmission part 110 Voice generation part 112 Buffer processing part 114 Voice data conversion part 116 Error packet detection part 118 Retransmission request part 120 Voice packet reception detection part 130 Standby control part 140 Voice output possibility detection part 150 Voice output Unit 152 notification sound output unit 154 speaker 160 antenna 200 original data 202, 204 voice packet 206 corrupted packet 208 lost packet 210 processing 212 buffer 220 transmission data 250 transmission delay 300, 310 arrow 315 period 1000 CPU
1010 ROM
1020 RAM
1030 Communication interface 1075 Graphic controller 1080 Display device 1082 Host controller 1084 Input / output controller

Claims (9)

A communication terminal that performs half-duplex communication of voice data by packet communication,
A receiver for receiving a plurality of voice packets indicating voice;
A voice generation unit that generates the voice from the plurality of voice packets received by the reception unit;
A sound output enable detection unit that detects that the sound can be output by the sound generation unit generating the sound;
A standby control unit that causes the communication terminal to wait until the voice output enable detection unit detects that the voice can be output;
At least a notification sound output unit that outputs an output notification sound indicating that the sound is output at a timing when the sound output enable detection unit detects that the sound can be output;
A communication terminal comprising: a sound output unit that outputs the sound generated by the sound generation unit after the notification sound output unit outputs the output notification sound. A voice packet reception detection unit for detecting that a predetermined voice packet is received from the plurality of voice packets received by the reception unit;
The notification sound output unit further outputs a reception notification sound indicating that the predetermined voice packet has been received at a timing when the voice packet reception detection unit detects that the predetermined voice packet has been received. The communication terminal described in 1. The communication terminal according to claim 2, wherein the voice packet reception detection unit detects that one of the plurality of voice packets received by the reception unit is received first. The notification sound output unit is from the timing at which the voice packet reception detection unit detects that the predetermined voice packet has been received to the timing at which the voice output enable detection unit detects that the voice can be output. The communication terminal according to claim 2, wherein the reception notification sound and the output notification sound are continuously output. The communication terminal according to claim 4, wherein the reception notification sound and the output notification sound are sounds having different frequencies. The voice generation unit
A buffer processing unit for temporarily storing the plurality of voice packets received by the receiving unit by a predetermined number of packets;
An audio data conversion unit that converts the plurality of audio packets into audio data by the predetermined number of packets stored in the buffer processing unit;
The voice output enable detection unit, when the predetermined number of packets among the plurality of voice packets received by the reception unit has been converted by the voice data conversion unit, when a predetermined time has elapsed, The communication terminal according to claim 1, wherein it detects that voice can be output. The voice generation unit
Error packet detection unit for detecting a damaged voice packet among the plurality of voice packets received by the reception unit or a lost voice packet among the plurality of voice packets to be received by the reception unit When,
A retransmission request unit for requesting retransmission of the voice packet detected by the error packet detection unit to the communication terminal that has transmitted the plurality of voice packets;
The voice output enable detection unit is configured to receive the voice generated by the voice generation unit generating the voice after the reception unit receives the voice packet requested to be retransmitted by the retransmission request unit. The communication terminal according to claim 1 to be detected. A communication method for performing half-duplex communication of voice data by packet communication,
Receiving a plurality of voice packets indicative of voice;
A voice generation stage for generating the voice from the plurality of voice packets received in the reception stage;
A voice output enable detection step for detecting that the voice can be output by generating the voice in the voice generation step;
A standby control stage for waiting the communication terminal until it is detected in the voice output enable detection stage that the voice can be output;
At least a notification sound output step for outputting an output notification sound indicating that the sound is output at a timing when the sound output enable detection step detects that the sound can be output;
A communication method comprising: a sound output step of outputting the sound generated in the sound generation step after the output notification sound is output in the notification sound output step. A communication program for a communication terminal that performs half-duplex communication of voice data by packet communication, the communication terminal,
A receiver for receiving a plurality of voice packets indicating voice;
A voice generation unit that generates the voice from the plurality of voice packets received by the reception unit;
A sound output enable detection unit for detecting that the sound can be output by the sound generation unit generating the sound;
A standby control unit that causes the communication terminal to wait until the voice output enable detection unit detects that the voice can be output;
At least a notification sound output unit that outputs an output notification sound indicating that the sound is output at a timing when the sound output enable detection unit detects that the sound can be output, and the notification sound output unit A communication program that functions as an audio output unit that outputs the audio generated by the audio generation unit after outputting the output notification sound.

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