Communication terminal and control method

Abstract

To provide a communication terminal that can easily use a call by IP wireless communication and a call by IP telephone communication differently.SOLUTION: A communication terminal (1) includes a main body side codec (51) that decodes an output signal from a call control unit (71) and outputs the output signal to a main body side speaker (11), and also encodes an input signal from a main body side microphone (12) and inputs the input signal to the call control unit, and a handset side codec (52) that decodes the output signal from the call control unit and outputs the output signal to a handset side speaker (21), and also encodes an input signal from a handset side microphone (22) and inputs the input signal to the call control unit.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a communication terminal and a control method for the communication terminal.

Background Art

[0002] Conventionally, relay devices for relaying voice communication such as transceivers or telephones over a network have been proposed. By connecting a plurality of relay devices via a network, it is also possible to enable different types of communication devices such as IP telephones and radios to communicate with each other by voice communication.

[0003] Patent Document 1 discloses a relay device that enables switching of a transmission control method for a voice signal according to the function of a communication partner. When there is a call from a SIP telephone to an analog transceiver, the relay device determines the address and device type of the analog transceiver from the call information, and transmits the voice signal to the analog transceiver using a transmission control method suitable for the analog transceiver.

[0004] In addition, communication terminals equipped with both an IP telephone call function using SIP and a PTT call function using an IP network by the PTT method have also been put into practical use. In the following description, for convenience, communication by the PTT method is referred to as IP wireless communication, and a call by IP wireless communication is referred to as an IP wireless call.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a communication terminal equipped with both an IP phone call function and an IP wireless call function, calls are made using one microphone and one speaker. In this case, the IP phone call function and the IP wireless call function are switched by an instruction input from the user. On the other hand, for example, in a stationary communication terminal equipped with a main body side speaker and a main body side microphone, and a handset side speaker and a handset side microphone, there is room for improvement in how to properly use the IP phone call function and the IP wireless call function.

[0007] One aspect of the present invention aims to realize a communication terminal capable of easily differentiating between calls by IP wireless communication and calls by IP phone communication.

Means for Solving the Problem

[0008] To solve the above problems, a communication terminal according to one aspect of the present invention includes a PTT call processing unit that performs a PTT call by the PTT (Push to Talk) method, an IP phone processing unit that performs an IP phone call by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, a call control unit that controls the PTT call by the PTT call processing unit and the call by the IP phone processing unit, a main body having a main body side speaker and a main body side microphone for performing a call by the PTT call processing unit, a handset having a handset side speaker and a handset side microphone for performing a call by the IP phone processing unit, a main body side codec that decodes an output signal from the call control unit and outputs it to the main body side speaker, and encodes an input signal from the main body side microphone and inputs it to the call control unit, and a handset side codec that decodes an output signal from the call control unit and outputs it to the handset side speaker, and encodes an input signal from the handset side microphone and inputs it to the call control unit.

[0009] Also, a method for controlling a communication terminal according to an aspect of the present invention includes a PTT call processing unit that performs a PTT call using the PTT (Push to Talk) method, an IP phone processing unit that performs an IP phone call using SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, a call control unit that controls the PTT call by the PTT call processing unit and the call by the IP phone processing unit, a main body including a main body side speaker and a main body side microphone where the call by the PTT call processing unit is performed, and a handset including a handset side speaker and a handset side microphone where the call by the IP phone processing unit is performed. The method for controlling a communication terminal includes: a step of decoding an output signal from the call control unit and outputting it to the main body side speaker; a step of encoding an input signal from the main body side microphone and inputting it to the call control unit; a step of decoding an output signal from the call control unit and outputting it to the handset side speaker; and a step of encoding an input signal from the handset side microphone and inputting it to the call control unit.

Effects of the Invention

[0010] According to an aspect of the present invention, it is possible to realize a communication terminal that can easily distinguish between a call by IP wireless communication and a call by IP phone communication.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0012] Hereinafter, an embodiment of the present invention will be described in detail.

[0013] 〔Communication System〕 FIG. 1 is a diagram showing an example of the configuration of a communication system 100 including a communication terminal 1 according to Embodiment 1. In the example shown in FIG. 1, the communication system 100 includes a relay device 110, a communication terminal 1, and communication terminals 131, 132, 133, and 134.

[0014] The communication terminal 1 is a communication terminal capable of communicating by a plurality of communication methods. Specifically, the communication terminal 1 has a PTT (Push to Talk) call function using an IP (Internet Protocol) network by the PTT method and an IP phone call function by IP phone communication by SIP (Session Initiation Protocol). As will be described later, the connection of the communication terminal 1 to the IP network 121 may be made by wire or wirelessly. In the following description, for convenience, communication by the PTT method is referred to as IP wireless communication, and a call by the IP wireless communication is referred to as an IP wireless call function. The communication terminal 1 is connected to the IP network 121 by wire or wirelessly and is connected to the relay device 110 via the IP network 121. The specific configuration of the communication terminal 1 will be described later. Note that communication by the PTT method is not limited to that via an IP network and may be performed via other types of communication networks.

[0015] The communication terminals 131 to 134 are communication terminals capable of communicating via IP wireless communication or IP telephone communication. The communication terminal 131 is connected to the relay device 110 via the IP network 121 and performs IP wireless communication. The communication terminal 132 is connected to the relay device 110 via an LTE (Long-Term Evolution) communication network 122 having a base station (not shown) and performs IP wireless communication. The communication terminal 133 is connected to the relay device 110 via the IP network 121 and performs IP wireless communication and IP telephone communication. The communication terminal 134 is connected to the relay device 110 via the LTE communication network 122 and performs IP wireless communication and IP telephone communication.

[0016] The relay device 110 is a device in which a VoIP (Voice over Internet Protocol) gateway 111 and a network communication relay unit 112 are integrally configured. However, the communication system 100 does not necessarily need to include the relay device 110 in which the VoIP gateway 111 and the network communication relay unit 112 are integrated, and the VoIP gateway 111 and the network communication relay unit 112 may be provided separately.

[0017] The VoIP gateway 111 is a gateway device that relays the VoIP procedure for transmitting voice signals via the IP network 121 and a communication terminal that performs telephone communication. The VoIP gateway 111 relays IP telephone communication between the communication terminal 1 and the communication terminals 133 and 134, or between the communication terminals 133 and 134. The communication terminal 134 is connected to the VoIP gateway 111 in the relay device 110 via the LTE communication network 122.

[0018] The VoIP gateway 111 incorporates a SIP (Session Initiation Protocol) server function. The SIP server function is a function that uses the SIP protocol to associate a telephone number (URI) with an IP address and perform call control to call and connect the telephone of the communication partner. However, the communication system 100 may be provided with an IP-PBX (Internet Protocol Private Branch eXchange) device that performs circuit switching of communication terminals having an IP telephone communication function instead of the VoIP gateway 111.

[0019] The network communication relay unit 112 relays communication between the communication terminal 1 and the communication terminals 131 to 134, or between the communication terminals 131 to 134. In particular, the network communication relay unit 112 relays IP wireless communication between the communication terminal 1 and the communication terminals 131 to 134, or between the communication terminals 131 to 134.

[0020] Also, the network communication relay unit 112 receives voice packets transmitted from the communication terminal 1 or the communication terminals 131 and 133. Further, the network communication relay unit 112 distributes the voice signal of this packet to the communication terminal 1 of the communication partner or the communication terminals 131 and 133 based on the communication control information written in the voice packet. Thereby, the user can perform voice communication via the IP network 121 with the same feeling of use as a conventional transceiver.

[0021] Note that in the relay device 110, the VoIP gateway 111 and the network communication relay unit 112 may be connected so that a call can be made between a communication terminal performing IP telephone communication and a communication terminal performing IP wireless communication.

[0022] 〔Configuration of Communication Terminal〕 FIG. 2 is a plan view showing an example of the appearance of the communication terminal 1. FIG. 3 is a block diagram showing an example of the configuration of the main part of the communication terminal 1. In the examples shown in FIGS. 2 and 3, the communication terminal 1 includes a main body 10, a handset 20, and a cord 30. In FIG. 3, the cord 30 is omitted.

[0023] The main body 10 includes a main body side speaker 11 and a main body side microphone 12. The main body side speaker 11 outputs sound during a call made by the main body 10. The main body side microphone 12 receives an input of sound during a call made by the main body 10.

[0024] The main body 10 further includes a hook switch 13. The hook switch 13 is pressed when the handset 20 is on-hook and released when the handset 20 is off-hook. That is, the hook switch 13 is a switch for detecting whether the handset 20 is off-hook.

[0025] The main body 10 further includes a PTT button 14. The PTT button 14 is a button for starting a transmission by the PTT method. For example, the communication terminal 1 may start a transmission at the timing when the user presses the PTT button 14 and end the transmission at the timing when the user releases the PTT button 14. Alternatively, the communication terminal 1 may start a transmission at the timing when the user presses and releases the PTT button 14 and end the transmission at the timing when the user presses and releases the PTT button 14 again.

[0026] The main body 10 further includes a display unit 15. The display unit 15 displays information about the operation of the communication terminal 1. The display unit 15 may be a known display device such as a liquid crystal panel.

[0027] The main body 10 further includes an instruction input unit 16. The instruction input unit 16 may be a button provided on the surface of the main body 10, but is not limited thereto. For example, the instruction input unit 16 may be a touch panel provided to overlap with the display unit 15. The instruction input unit 16 receives an instruction input from the user for displaying at least any one of a call destination list, a reception or incoming call history, and a transmission or outgoing call history on the display unit 15.

[0028] The handset 20 includes a handset side speaker 21 and a handset side microphone 22 (see FIG. 3). The handset side speaker 21 outputs sound during a call made by the handset 20. The handset side microphone 22 receives an input of sound during a call made by the handset 20. During communication by the handset 20, the user may hold the handset 20 near his / her head such that the handset side speaker 21 is positioned near the ear and the handset side microphone 22 is positioned near the mouth.

[0029] The cord 30 is a cord that connects the main body 10 and the handset 20. For the cord 30, a known cord can be used without particular limitation.

[0030] Also, as shown in FIG. 3, a headset 90 can be connected to the communication terminal 1. The user can connect the headset 90 to the communication terminal 1 and make a call. The headset 90 includes a headset side speaker 91 and a headset side microphone 92. The headset side speaker 91 outputs sound during a call made by the headset 90. The headset side microphone 92 receives an input of sound during a call made by the headset 90.

[0031] 〔Detailed Configuration of Main Body〕 A more detailed configuration of the main body 10 will be described below.

[0032] The main body 10 is provided with amplifiers 41, 42, 43, 44, 45, and 46. The amplifier 41 amplifies the audio signal output to the main body side speaker 11. The amplifier 42 amplifies the audio signal input from the main body side microphone 12. The amplifier 43 amplifies the audio signal output to the handset side speaker 21. The amplifier 44 amplifies the audio signal input from the handset side microphone 22. The amplifier 45 amplifies the audio signal output to the headset side speaker 91 when the headset 90 is connected to the communication terminal 1. The amplifier 46 amplifies the audio signal input from the headset side microphone 92 when the headset 90 is connected to the communication terminal 1. Note that the handset side speaker 21 and the headset side speaker 91 may be configured to be amplified by one amplifier, and the connection destination may be appropriately switched by a switch. Similarly, the handset side microphone 22 and the headset side microphone 92 may be configured to be amplified by one amplifier, and the connection destination may be appropriately switched by a switch.

[0033] The main body 10 further includes a main body side codec 51 and a handset side codec 52. The main body side codec 51 decodes the output signal from the call control unit 71 and outputs it to the main body side speaker 11, and encodes the input signal from the main body side microphone 12 and inputs it to the call control unit 71. The handset side codec 52 decodes the output signal from the call control unit 71 and outputs it to the handset side speaker 21, and encodes the input signal from the handset side microphone 22 and inputs it to the call control unit 71. Also, when the headset 90 is connected to the communication terminal 1 and the user makes a call using the headset 90, the handset side codec 52 decodes the output signal from the call control unit 71 and outputs it to the headset side speaker 91, and encodes the input signal from the headset side microphone 92 and inputs it to the call control unit 71.

[0034] The main body 10 further includes an audio cancellation processing unit 60. The audio cancellation processing unit 60 removes the audio signals output to the main body side speaker 11 and the handset side speaker 21 from the audio signals input from the main body side microphone 12 or the handset side microphone 22. When a headset 90 is connected to the communication terminal 1, the audio cancellation processing unit 60 removes the audio signals output to the main body side speaker 11, the handset side speaker 21, and the headset side speaker 91 from the audio signals input from the main body side microphone 12, the handset side microphone 22, or the headset side microphone 92.

[0035] That is, the audio cancellation processing unit 60 prevents howling caused by the output of the main body side speaker 11 being input to the main body side microphone 12 and howling caused by the output of the handset side speaker 21 being input to the handset side microphone 22. Further, even when IP telephone communication is performed by the handset 20, the audio cancellation processing unit 60 cancels the output from the main body side speaker 11 in addition to the output from the handset side speaker 21 from the audio signal of the handset side microphone 22, thereby suppressing mixing into the call being made on the handset 20 side. As a result, the quality of the audio signal transmitted to the outside can be improved regardless of whether the audio signal is input from the main body side microphone 12, the handset side microphone 22, or the headset side microphone 92.

[0036] The main body 10 further includes a control unit 70. The control unit 70 controls the operation of the communication terminal 1. The control unit 70 includes a call control unit 71, an IP wireless processing unit 72 (PTT call processing unit), and an IP telephone processing unit 73.

[0037] The IP wireless processing unit 72 performs IP wireless communication in the PTT method via the IP network 121. The IP telephone processing unit 73 performs IP telephone communication by SIP via the IP network 121. The call control unit 71 controls the calls by the IP wireless processing unit 72 and the calls by the IP telephone processing unit 73.

[0038] Also, when a call is being made by the IP phone processing unit 73 using the handset side speaker 21 and the handset side microphone 22, if the PTT button 14 is pressed by the user, the IP phone processing unit 73 may mute the voice input from the handset side microphone 22 during the period when the PTT button 14 is pressed. This processing in the IP phone processing unit 73 will be described later with reference to FIG. 4.

[0039] Also, when a call is being made by the IP phone processing unit 73 using the handset side speaker 21 and the handset side microphone 22, even if the PTT button 14 is pressed by the user, the IP wireless processing unit 72 may not output the voice input from the main body side microphone 12 as the speech of the call by the IP wireless processing unit 72. This processing in the IP phone processing unit 73 will be described later with reference to FIG. 5.

[0040] The control unit 70 comprehensively controls the operation of the communication terminal 1, not limited to the processing by the call control unit 71, the IP wireless processing unit 72, and the IP phone processing unit 73. For example, the control unit 70 controls the display unit 15 to display the above-described information.

[0041] The main body 10 further includes a storage unit 80. The storage unit 80 is a storage device that stores information required by the control unit 70 in the control of the communication terminal 1. However, in the communication terminal 1, the storage unit 80 is not essential. When the communication terminal 1 does not include the storage unit 80, the communication terminal 1 may be communicably connected to an external storage device.

[0042] In the communication terminal 1, the call by the IP wireless processing unit 72 is made using the main body side speaker 11 and the main body side microphone 12. Also, the call by the IP phone processing unit 73 is made using the handset side speaker 21 and the handset side microphone 22. Therefore, in the communication terminal 1 capable of both calls by IP wireless communication and calls by IP phone communication, the user can easily distinguish between the two without confusion.

[0043] Also, as described above, the main body side codec 51 decodes the output signal from the call control unit 71 and outputs it to the main body side speaker 11, and encodes the input signal from the main body side microphone 12 and inputs it to the call control unit 71. The handset side codec 52 decodes the output signal from the call control unit 71 and outputs it to the handset side speaker 21, and encodes the input signal from the handset side microphone 22 and inputs it to the call control unit 71.

[0044] Therefore, in the communication terminal 1, the main body side speaker 11 and the main body side microphone 12, as well as the handset side speaker 21 and the handset side microphone 22, can each independently perform voice input and output. Thus, when processing two calls simultaneously, each call can be allocated to the main body side speaker 11 and the main body side microphone 12, as well as the handset side speaker 21 and the handset side microphone 22 for voice input and output.

[0045] Also, in the conventional case where one codec exclusively switches between the main body 10 side and the handset 20 side for voice input and output, for example, when a call from another line occurs during a call on one line, it is necessary to adjust the output level of the call tone depending on whether the main body 10 side or the handset 20 side is being used, resulting in complicated control. On the other hand, according to the above configuration, in the control unit 70, it is possible to preset the output levels for the main body 10 side and the handset 20 side respectively, thus facilitating the control during the above switching.

[0046] Also, the voice cancel processing unit 60 cancels the voice output from the main body side speaker 11 from the input voice signal generated by the handset side microphone 22. Thereby, it is possible to suppress the voice output from the main body side speaker 11 from being mixed into the call being made on the handset 20 side. Thus, even when two calls, namely a call by IP wireless communication and a call by IP phone communication, are made simultaneously, it is possible to suppress voice interference from occurring in each call.

[0047] Also, in the communication terminal 1, as described above, the main body 10 is provided with a PTT button 14 for starting a voice call by the PTT method. Therefore, while a call is being made by IP wireless communication using the main body side speaker 11 and the main body side microphone 12, the user can start a voice call by pressing the PTT button 14 provided on the main body 10.

[0048] (An example of a control method for a communication terminal) FIG. 4 is a flowchart showing an example of a control method for the communication terminal 1. The control method shown in FIG. 4 starts when a call by the IP telephone processing unit 73 is started by the handset side speaker 21 and the handset side microphone 22.

[0049] In the control method shown in FIG. 4, the IP telephone processing unit 73 determines whether the PTT button 14 is pressed by the user (S11). If the PTT button 14 is pressed by the user (YES in S11), the IP telephone processing unit 73 mutes the voice input from the handset side microphone (S12). At this time, if the voice input from the handset side microphone has already been muted, that state continues. Also, at this time, since the PTT button 14 is pressed by the user, the IP wireless processing unit 72 starts a voice call by the PTT method.

[0050] Thereafter, the IP telephone processing unit 73 determines whether the call has ended (S13). If the call has ended (YES in S13), the IP telephone processing unit 73 ends the process. If the call has not ended (NO in S13), the IP telephone processing unit 73 repeats the process from step S11.

[0051] On the other hand, when the PTT button 14 is not pressed by the user (NO in S11), the IP phone processing unit 73 releases the mute of the voice input from the handset side microphone (S14). At this time, if the voice input from the handset side microphone is not muted, that state is continued. After that, the IP phone processing unit 73 executes step S13.

[0052] According to the control method shown in FIG. 4, when the PTT button 14 is pressed during an IP phone call, the voice input from the handset side microphone 22 is muted. Therefore, when an IP wireless call is started during an IP phone call, the user can prevent the other party in the IP phone call from hearing the uttered content only by pressing the PTT button 14 to speak for the IP wireless call.

[0053] (Another example of the control method of the communication terminal) FIG. 5 is a flowchart showing another example of the control method of the communication terminal 1 different from the example shown in FIG. 4. The control method shown in FIG. 5 also starts when a call by the IP phone processing unit 73 is started by the handset side speaker 21 and the handset side microphone 22.

[0054] In the control method shown in FIG. 5, the IP wireless processing unit 72 determines whether the PTT button 14 is pressed by the user (S21). When the PTT button 14 is pressed by the user (YES in S21), the IP wireless processing unit 72 does not output the voice input from the main body side microphone 12 as the utterance of the call by the IP wireless processing unit 72 (S22).

[0055] After that, the IP wireless processing unit 72 determines whether the call has ended (S23). When the call has ended (YES in S23), the IP wireless processing unit 72 ends the process. When the call has not ended (NO in S23), the IP wireless processing unit 72 repeats the process from step S21. On the other hand, when the PTT button 14 is not pressed by the user (NO in S21), the IP wireless processing unit 72 skips step S22 and executes step S23.

[0056] According to the control method shown in FIG. 5, even when the PTT button 14 is pressed during an IP phone call, the voice input from the main body side microphone 12 is not output as the speech of the call by the IP wireless processing unit 72. Therefore, when an IP phone call and an IP wireless call are being made simultaneously, it is possible to prohibit speaking to the IP wireless call, thus preventing the conversation between the IP phone call and the IP wireless call from becoming confused.

[0057] 〔Example of Realization by Software〕 The functions of the communication terminal 1 (hereinafter referred to as the "device") can be realized by a program for causing a computer to function as the device, and by a program for causing a computer to function as each control block of the device (particularly each part included in the control unit 70).

[0058] In this case, the above device includes, as hardware for executing the above program, a computer having at least one control device (for example, a processor) and at least one storage device (for example, a memory). By executing the above program with this control device and storage device, each function described in the above embodiments is realized.

[0059] The above program may be recorded on one or more computer-readable recording media, not temporarily. This recording medium may or may not be provided in the above device. In the latter case, the above program may be supplied to the above device via any wired or wireless transmission medium.

[0060] Also, part or all of the functions of each of the above control blocks can also be realized by a logic circuit. For example, an integrated circuit in which a logic circuit functioning as each of the above control blocks is formed is also included in the scope of the present invention.

[0061] 〔Summary〕 The present invention can also be expressed as follows.

[0062] The communication terminal according to Embodiment 1 of the present invention includes a PTT call processing unit that performs a PTT call by the PTT (Push to Talk) method, an IP phone processing unit that performs an IP phone call by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, a call control unit that controls the PTT call by the PTT call processing unit and the call by the IP phone processing unit, a main body including a main body side speaker and a main body side microphone that input and output the voice of the call by the PTT call processing unit, a handset including a handset side speaker and a handset side microphone that input and output the voice of the call by the IP phone processing unit, a main body side codec that decodes an output signal from the call control unit and outputs it to the main body side speaker, and encodes an input signal from the main body side microphone and inputs it to the call control unit, and a handset side codec that decodes an output signal from the call control unit and outputs it to the handset side speaker, and encodes an input signal from the handset side microphone and inputs it to the call control unit.

[0063] According to the above configuration, the PTT call is made using the main body side speaker and the main body side microphone, and the IP phone call is made using the handset side speaker and the handset side microphone. Therefore, in a communication terminal capable of both PTT calls and IP phone calls, the user can easily distinguish between the two without confusion.

[0064] In addition, it is possible to independently perform voice input and output using the main body side speaker and the main body side microphone, and the handset side speaker and the handset side microphone. Therefore, when processing two calls simultaneously, it is possible to allocate each call to the main body side speaker and the main body side microphone, and the handset side speaker and the handset side microphone for voice input and output.

[0065] Also, when, as in the prior art, a single codec is used to exclusively switch between the main body side and the handset side for voice input / output, for example, when a call from another line occurs during a call on one line, it is necessary to adjust the output level of the call tone depending on whether the main body side or the handset side is being used, resulting in complicated control. On the other hand, according to the above configuration, it is possible to preset the output levels on the main body side and the handset side in the control unit, thus facilitating the control at the time of switching as described above.

[0066] The communication terminal according to Aspect 2 of the present invention further includes, in Aspect 1, an audio cancellation processing unit that cancels the audio output from the main body side speaker from the input audio signal generated by the handset side microphone.

[0067] According to the above configuration, it is possible to suppress the audio output from the main body side speaker from being mixed into the call being made on the handset side. Therefore, even when two calls are made simultaneously, it is possible to suppress the occurrence of audio interference in each call.

[0068] The communication terminal according to Aspect 3 of the present invention is provided with, in Aspect 1 or 2, a PTT button for starting a speech by the PTT method on the main body.

[0069] According to the above configuration, when a call is being made by IP wireless communication using the main body side speaker and the main body side microphone, the user can start a speech by pressing the PTT button provided on the main body.

[0070] The communication terminal according to Aspect 4 of the present invention, in Aspect 3, when the PTT button is pressed by the user while a call is being made by the IP telephone processing unit using the handset side speaker and the handset side microphone, the IP telephone processing unit mutes the voice input from the handset side microphone during the period when the PTT button is pressed.

[0071] According to the above configuration, when the PTT button is pressed during an IP phone call, the voice input from the handset side microphone will be muted. Therefore, when an IP wireless call is started during an IP phone call, the user can prevent the other party on the IP phone call from hearing the voice content of the IP wireless call by simply pressing the PTT button to speak to the IP wireless call.

[0072] In the communication terminal according to Embodiment 5 of the present invention, in Embodiment 3, when the call by the IP phone processing unit is being performed by the handset side speaker and the handset side microphone, even if the PTT button is pressed by the user, the voice input from the main body side microphone is not output as the speech of the call by the PTT call processing unit.

[0073] According to the above configuration, even if the PTT button is pressed during an IP phone call, it is not output as the speech of the call by the PTT call processing unit. Therefore, when an IP phone call and a PTT call are being performed simultaneously, it is possible to prohibit speaking to the PTT call, thereby preventing the conversation between the IP phone call and the PTT call from being confused.

[0074] In the communication terminal according to Embodiment 6 of the present invention, in any one of Embodiments 1 to 5, the PTT call processing unit performs the PTT call via the IP network.

[0075] According to the above configuration, for the PTT call and the IP phone call via the IP network, the user can make a call in an appropriate call mode by simply taking the handset off the hook.

[0076] The control method for a communication terminal according to aspect 7 of the present invention includes a PTT call processing unit that performs a PTT call using the PTT (Push to Talk) method, an IP phone processing unit that performs an IP phone call using SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, a call control unit that controls the PTT call by the PTT call processing unit and the call by the IP phone processing unit, a main body having a main body side speaker and a main body side microphone through which the call by the PTT call processing unit is performed, and a handset having a handset side speaker and a handset side microphone through which the call by the IP phone processing unit is performed. The control method includes steps of decoding an output signal from the call control unit and outputting it to the main body side speaker, encoding an input signal from the main body side microphone and inputting it to the call control unit, decoding an output signal from the call control unit and outputting it to the handset side speaker, and encoding an input signal from the handset side microphone and inputting it to the call control unit.

[0077] According to the above configuration, the same effect as that of aspect 1 is achieved.

[0078] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

Explanation of Reference Numerals

[0079] 1 Communication terminal 10 Main body 11 Main body side speaker 12 Main body side microphone 14 PTT button 20 Handset 21 Handset side speaker 22 Handset side microphone 51 Main body side codec 52 Handset side codec 60 Voice cancellation processing unit 71 Call control unit 72 IP wireless processing unit (PTT call processing unit) 73 IP phone processing unit

Claims

1. A PTT call processing unit that performs PTT calls by the PTT (Push to Talk) method, An IP phone processing unit that performs IP phone calls by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network, A call control unit that controls the PTT calls by the PTT call processing unit and the calls by the IP phone processing unit, A main body including a main body side speaker and a main body side microphone for inputting and outputting the voice of the call by the PTT call processing unit, A handset including a handset side speaker and a handset side microphone for inputting and outputting the voice of the call by the IP phone processing unit, A main body side codec that decodes the output signal from the call control unit and outputs it to the main body side speaker, and encodes the input signal from the main body side microphone and inputs it to the call control unit, A handset side codec that decodes the output signal from the call control unit and outputs it to the handset side speaker, and encodes the input signal from the handset side microphone and inputs it to the call control unit, A communication terminal comprising the above.

2. The communication terminal according to claim 1, further comprising a voice canceling processing unit that cancels the voice output from the main body side speaker from the input voice signal generated by the handset side microphone.

3. The communication terminal according to claim 1 or 2, wherein the main body is provided with a PTT button for starting a speech by the PTT method.

4. When the IP phone processing unit is making a call by the IP phone processing unit using the handset side speaker and the handset side microphone, and the PTT button is pressed by the user, during the period when the PTT button is pressed, the IP phone processing unit according to claim 3, wherein the voice input from the handset side microphone is muted.

5. Even when the PTT button is pressed by the user while the IP phone processing unit is making a call by the IP phone processing unit using the handset side speaker and the handset side microphone, the PTT call processing unit according to claim 3, wherein the voice input from the main body side microphone is not output as a speech of the call by the PTT call processing unit.

6. The PTT call processing unit performs the PTT call via the IP network, and the communication terminal according to claim 1.

7. A control method for a communication terminal, comprising: a PTT call processing unit that performs a PTT call by a PTT (Push to Talk) method; an IP phone processing unit that performs an IP phone call by SIP (Session Initiation Protocol) via an IP (Internet Protocol) network; a call control unit that controls the PTT call by the PTT call processing unit and the call by the IP phone processing unit; a main body including a main body side speaker and a main body side microphone through which the call by the PTT call processing unit is performed; and a handset including a handset side speaker and a handset side microphone through which the call by the IP phone processing unit is performed, the method comprising: decoding an output signal from the call control unit and outputting the decoded signal to the main body side speaker; encoding an input signal from the main body side microphone and inputting the encoded signal to the call control unit; decoding an output signal from the call control unit and outputting the decoded signal to the handset side speaker; and encoding an input signal from the handset side microphone and inputting the encoded signal to the call control unit.

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