JP2007259056A - Wireless communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication apparatus for realizing excellent voice communication by suppressing the effect by a wireless communication state. <P>SOLUTION: A control section 19 of the wireless communication apparatus 1 transmits/receives control data to/from an opposite wireless communication apparatus to select a different coding system in the midst of carrying out voice communication with the opposite wireless communication apparatus and decreases a transmission/reception interval of the control data in switching the coding system. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless communication technique, and more particularly to a wireless communication technique for transmitting and receiving encoded voice via a wireless line.

  In a wireless communication device such as a wireless telephone, voice encoded using an arbitrary encoding method is transmitted and received by wireless communication with a counterpart wireless communication device. For example, in the Bluetooth (registered trademark: Bluetooth) wireless communication system, a transmission system called SCO (Synchronous Connection Oriented links) is provided to transmit encoded audio.

  Typical examples of such coding methods include coding methods such as μ-law, A-law, and CVSD (Continuous Variable Slope Delta Modulation). μ-law is mainly used for encoding telephone speech in the United States and Japan, and A-law is mainly used for encoding telephone speech in Europe. Further, CVSD is used for encoding telephone voice in the Bluetooth wireless communication system (see, for example, Non-Patent Document 1).

In a general wireless communication apparatus, when encoded audio data is transmitted / received by wireless communication, since the audio is encoded using any one encoding method fixedly determined in advance, the communication of the wireless communication is performed. If the situation changes, good voice communication cannot be maintained.
On the other hand, the encoding method has advantages and disadvantages according to the communication status. For example, μ-law and A-law can transmit and receive sound with extremely high sound quality, but harsh noise is likely to occur even with a slight transmission and reception error. On the other hand, although CVSD has lower sound quality than μ-law and A-law, it is hard to generate harsh noise that is strong against transmission and reception errors.

  Therefore, a method of selecting an encoding method to be used for encoding from among a plurality of encoding methods according to the communication status of wireless communication with the counterpart wireless communication device can be considered. When voice is exchanged with the other party's wireless communication device, the voice can be encoded with an appropriate encoding method according to the communication status of the wireless communication. Communication can be realized.

Oki Electric Research and Development, October 2000, No.184, Vol.67 No.3, p.55

However, in such a conventional wireless communication apparatus, when switching to another encoding method during voice communication, the encoding method of the audio data is inconsistent only for the period required for switching the encoding method. Therefore, there is a problem that annoying noise is generated in the voice.
The present invention has been made to solve such problems, and an object of the present invention is to provide a wireless communication apparatus that can suppress noise generated when switching between encoding methods during voice communication.

  In order to achieve such an object, a wireless communication apparatus according to the present invention is a wireless communication apparatus that transmits and receives audio encoded using an arbitrary encoding method to and from a partner wireless communication apparatus by wireless communication. In addition, a control unit is provided that switches to a different encoding method by transmitting and receiving control data to and from the counterpart wireless communication apparatus, and shortens the transmission / reception interval of the control data when the encoding method is switched.

Further, another wireless communication apparatus according to the present invention is a wireless communication apparatus that transmits and receives audio encoded using an arbitrary encoding method to and from a partner wireless communication apparatus by wireless communication. A control unit that switches the original encoding method to a different encoding method by transmitting and receiving control data to and from the other wireless communication device and instructs the counterpart wireless communication apparatus to stop outputting audio during the switching period of the encoding method. I have.
At this time, the control unit may instruct the partner wireless communication apparatus to stop outputting the audio for the switching period of the encoding method.

According to the present invention, the encoding method switching unit of the wireless communication device transmits and receives control data to and from the partner wireless communication device during voice communication and switches to a different encoding method. Because the control data transmission / reception interval is shortened when the coding method is switched, the control data exchanged between the wireless communication devices is efficiently transmitted / received at short intervals, and the period required for completing the coding method switching procedure Can be shortened.
Therefore, it is possible to suppress noise generated when switching the encoding method during voice communication. As a result, even while voice is being exchanged with the counterpart wireless communication device 2, the voice can be encoded using an appropriate encoding method according to the communication status of the wireless communication. It is possible to achieve good voice communication by suppressing the influence of the.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a radio communication apparatus according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the wireless communication apparatus according to the first embodiment of the present invention.
The wireless communication device 1 is an electronic device that transmits and receives audio encoded using an arbitrary encoding method, that is, digital audio data, by wireless communication with a counterpart wireless communication device 2 connected via a wireless line 3. .

In the present embodiment, the control unit 19 of the wireless communication device 1 switches the original encoding method to a different encoding method by transmitting and receiving control data to and from the counterpart wireless communication device, and The control data transmission / reception interval is shortened at the time of switching.
In the following, the wireless communication device 1 according to the present embodiment is applied to the wireless master device (main body) of the curl cordless telephone device, and the counterpart wireless communication device 2 is applied to the wireless slave device (handset) of the wireless telephone device. Will be described as an example.

[Wireless communication device]
The wireless communication apparatus 1 is a wireless master unit (main body) of a curlless telephone apparatus in which a telephone apparatus body and a handset are connected via a wireless line, and is connected to a telephone network 5 via a telephone line 4.
The wireless communication apparatus 1 includes, as main functional units, a line interface unit (hereinafter referred to as a line I / F unit) 11, an audio processing unit 12, a wireless interface unit (hereinafter referred to as a wireless I / F unit) 13, a communication A status detection unit 14, an encoding method switching unit 15, an operation input unit 16, a display unit 17, a storage unit 18, and a control unit 19 are provided, and various data are exchanged between these functional units via the internal bus 10. Is done.

The line I / F unit 11 is composed of a dedicated communication circuit, and accommodates the telephone line 4 from the telephone network 5 such as PSTN, ISDN, IP network, wireless telephone network, etc., and the telephone network 5 and various control data and voice signals. It has a function to exchange.
The audio processing unit 12 includes a dedicated signal processing circuit, and has a function of encoding / decoding audio using the encoding method selected by the encoding method switching unit 15.
The wireless I / F unit 13 is composed of a dedicated communication circuit, and is connected to the counterpart wireless communication device 2 via the wireless line 3 based on a wireless communication method such as Bluetooth or wireless LAN, so that control data and encoded voice ( Audio data) is transmitted and received by wireless communication.

The communication status detection unit 14 detects a communication status related to wireless communication with the counterpart wireless communication device 2 based on communication status information from the wireless I / F unit 13 and various information received by the wireless I / F unit 13. have.
The encoding method switching unit 15 has a function of selecting an encoding method to be used by the speech processing unit 12 based on the communication status detected by the communication status detecting unit 14.

The operation input unit 16 includes operation input devices such as various keys and operation switches, and has a function of detecting a user operation and outputting the operation to the control unit 19.
The display unit 17 includes a display device such as an LED or an LCD, and has a function of performing various displays such as an incoming call display in response to an instruction from the control unit 19.
The storage unit 18 includes a storage device such as a memory, and has a function of storing various information such as control data used for processing in the control unit 19.

  The control unit 19 has a CPU and its peripheral circuits, and implements various functional means by cooperating the hardware and the program by reading and executing a program stored in the CPU or the storage unit 18 in advance. Thus, the wireless communication device 1 has a function of controlling the entire wireless communication device 1.

  The main functional means realized by the control unit 19 is to connect to the telephone network 5 by exchanging various signals and control data with the telephone network 5 via the line I / F unit 11 and the telephone line 4. Call control means for performing call control such as establishment of a call with the other party telephone apparatus 6 established, establishment of the wireless line 3 with the other party wireless communication apparatus 2 via the wireless I / F unit 13, and switching of the encoding method There is a wireless control unit that performs control such as notification of the encoding method selected by the unit 15 and change of a transmission / reception interval of control data exchanged through the wireless line 3. Of the above-described functional units, the communication status detection unit 14 and the coding method switching unit 15 may be realized by a dedicated logic circuit or may be realized by the control unit 19.

[Other wireless communication device]
The counterpart wireless communication device 2 is a wireless cordless handset (handset) of a curl cordless telephone device in which the telephone device body and the handset are connected via a wireless line, and is connected to the wireless communication device 1 via the wireless line 3. .
The counterpart wireless communication device 2 is provided with a wireless interface unit (hereinafter referred to as a wireless I / F unit) 21, an audio processing unit 22, and a control unit 23 as main functional units. Various data are exchanged between these functional units. In addition, an operation input unit 26, a display unit 27, and a storage unit 28 are connected to the control unit 23.

The wireless I / F unit 21 is composed of a dedicated communication circuit, and is connected to the wireless communication device 1 via the wireless line 3 based on a wireless communication system such as Bluetooth or wireless LAN. It has a function of transmitting and receiving control data by wireless communication.
The audio processing unit 22 includes a dedicated signal processing circuit, a function for performing encoding / decoding of audio using an encoding method instructed by the control unit 23, and audio data input from the wireless I / F unit 21. Has a function of decoding the audio signal into the audio signal and outputting it from the speaker 24, and a function of encoding the audio inputted from the microphone 25 into audio data and outputting it to the wireless I / F unit 21.

The control unit 23 has a CPU and its peripheral circuits, and implements various functional means by cooperating the hardware and the program by reading and executing a program stored in the CPU or the storage unit 18 in advance. By doing so, it has a function of controlling the counterpart wireless communication device 2 as a whole.
The main functional means realized by the control unit 23 are establishment of the wireless line 3 with the wireless communication device 1 via the wireless I / F unit 21, and the encoding method notified from the wireless communication device 1. There is a wireless control means for performing control such as switching and control for changing the control data transmission / reception interval notified from the wireless communication apparatus 1.

The operation input unit 26 includes operation input devices such as various keys and operation switches, and has a function of detecting a user operation and outputting the operation to the control unit 23.
The display unit 27 includes a display device such as an LED or an LCD, and has a function of performing various displays such as an incoming call display in response to an instruction from the control unit 23.
The storage unit 28 includes a storage device such as a memory, and has a function of storing various information such as control data and programs used for processing in the control unit 23.

[Operation of First Embodiment]
Next, the operation of the wireless communication apparatus according to the first embodiment of the present invention will be described with reference to FIG. 2 and FIG. FIG. 2 is a sequence diagram showing an encoding scheme switching operation of the wireless communication apparatus according to the first embodiment of the present invention. FIG. 3 is a flowchart showing a coding method selection process of the wireless communication apparatus according to the first embodiment of the present invention.
Here, after the wireless communication device 1 establishes a voice communication link using the μ-law encoding method with the counterpart wireless communication device 2, the encoding of the voice communication link is performed in accordance with the deterioration of the communication status. A case where the method is changed to CVSD will be described.

  When establishing a voice communication link using the μ-law encoding method with the counterpart wireless communication device 2 and performing a voice call with the counterpart telephone device 6 (step 100), control of the radio communication device 1 The unit 19 intermittently executes the encoding method selection process of FIG. 3 by the encoding method switching unit 15.

  The encoding method switching unit 15 first confirms the communication status related to wireless communication with the counterpart wireless communication device 2 by the communication status detection unit 14 (FIG. 3: step 120). At this time, the communication status detection unit 14 acquires the received electric field strength or the communication error status from the wireless I / F unit 13 when the voice data is exchanged with the counterpart wireless communication device 2 in Step 100 of FIG. The communication status is notified to the encoding method switching unit 15.

The encoding method switching unit 15 compares the communication status notified from the communication status detection unit 14 with a predetermined threshold (step 121), and when the communication status is bad and below the threshold (step 121: (YES), for example, a coding scheme that is resistant to transmission / reception errors such as CVSD is selected (step 122), and a series of coding selection processes is terminated.
On the other hand, when the communication status is good and above the threshold (step 121: NO), the coding method switching unit 15 continues the currently selected coding method without changing the coding method (step 123). ), A series of encoding selection processing ends.

  Therefore, when the communication status of the wireless line 3 deteriorates (FIG. 2: step 101), the encoding method is changed from μ-law to CVSD by the encoding method switching unit 15 in accordance with the encoding method selection process of FIG. It is changed (step 102).

  In response to this, the control unit 19 sends a transmission / reception interval shortening instruction to shorten the transmission / reception interval of control data exchanged with the counterpart wireless communication apparatus 2 via the wireless line 3 to the wireless I / F unit 13 and the wireless line 3. Is transmitted to the counterpart wireless communication device 2 (step 103), and the control data transmission / reception interval is shortened to the wireless I / F unit 13 to shorten the control data transmission / reception interval (step 104).

  On the other hand, when the wireless I / F unit 21 receives a transmission / reception interval shortening instruction from the wireless communication device 1, the control unit 23 of the counterpart wireless communication device 2 shortens the control data transmission / reception interval to the wireless I / F unit 21. (Step 105), the wireless I / F unit 21 transmits a response to the wireless communication device 1 via the wireless line 3 (step 106).

  In response to this response, the control unit 19 of the wireless communication device 1 issues a connection instruction for a voice communication link for exchanging voice using the new CVSD encoding method selected by the encoding method switching unit 15. / F unit 13 and the wireless communication device 2 via the wireless line 3 (step 107), and notifies the audio processing unit 12 of the CVSD encoding method selected by the encoding method switching unit 15 Then, CVSD is set as an encoding method used for speech encoding (step 108).

  On the other hand, when the control unit 23 of the counterpart wireless communication device 2 receives the voice communication link connection instruction from the wireless communication device 1 by the wireless I / F unit 21, the CVSD code designated by the voice communication link connection instruction The CVSD is set as the encoding method used for the audio encoding in the audio processing unit 22 (step 109), and then the wireless I / F unit 21 transmits to the wireless communication device 1 via the wireless line 3. A response is transmitted (step 110).

In response to this response, the control unit 19 of the wireless communication device 1 sends a transmission / reception interval initialization instruction for restoring the transmission / reception interval of control data via the wireless I / F unit 13 and the wireless line 3. 2 (step 111), the wireless I / F unit 13 is notified of the initialization of the control data transmission / reception interval, and the control data transmission / reception interval is restored (step 112).
On the other hand, when the control unit 23 of the partner wireless communication device 2 receives the transmission / reception interval initialization instruction from the wireless communication device 1 by the wireless I / F unit 21, the control unit 23 sets the control data transmission / reception interval to the wireless I / F unit 21. After instructing initialization (step 113), a response is transmitted from the wireless I / F unit 21 to the wireless communication apparatus 1 via the wireless line 3 (step 114).

  In a general wireless communication system such as Bluetooth, when various types of data are transmitted / received via wireless communication, data is transmitted / received intermittently based on a predetermined interval for the purpose of reducing power consumption. In particular, when transmitting and receiving streaming media such as voice, a relatively short transmission / reception interval is used in accordance with the communication quality, and a relatively long transmission / reception interval is used for control data exchanged as necessary.

  Therefore, when switching the encoding method by exchanging the control data, the control data is exchanged based on a relatively long transmission / reception interval. Therefore, the transmission / reception timing of the control data is constrained to the transmission / reception interval, and each wireless communication device Although the encoding method change process itself in FIG. 2 is completed immediately, it takes a relatively long time to complete the encoding method switching procedure between the wireless communication apparatuses.

FIG. 4 is a sequence diagram showing an operation for changing the control data transmission / reception interval. During normal operation before time T1, the transmission / reception interval of control data is set to ta1. The transmission / reception interval of audio data is fixed at ts regardless of the switching of the encoding method.
After steps 104 and 105 in FIG. 2, ie, after time T1, the transmission / reception interval of control data is changed to ta2 (ta1> ta2), and the transmission / reception interval of control data is returned to ta1 in steps 112 and 113 of FIG. 2, ie, time T2. .
Thus, since the transmission / reception interval of control data is shortened at the time of switching of the coding method, that is, during the period from time T1 to time T2, the control data exchanged between the wireless communication devices is efficiently transmitted and received at short intervals. The time required to complete the switching procedure can be shortened.

Thereafter, the control unit 19 of the wireless communication device 1 receives a response from the counterpart wireless communication device 2 via the wireless I / F unit 13, receives the line I / F unit 11, the voice processing unit 12, and the wireless I / F. Control unit 13 to perform a voice processing between a communication path with partner telephone apparatus 6 connected to telephone network 5 and a voice communication link with partner wireless communication apparatus 2 connected through wireless line 3. Interconnections are made via section 12.
As a result, the voice communication link between the wireless communication device 1 and the partner wireless communication device 2 is changed from the μ-law encoding method to the CVSD encoding method, and the call is continued (step 115).

  As described above, in the present embodiment, the control unit 19 of the wireless communication device 1 switches to a different encoding method by transmitting and receiving control data to and from the counterpart wireless communication device during voice communication. At the same time, since the transmission / reception interval of control data is shortened when the encoding method is switched, control data exchanged between wireless communication apparatuses is efficiently transmitted / received at short intervals, and the procedure for switching the encoding method is completed. Can shorten the period required by

  Therefore, it is possible to suppress noise generated when switching the encoding method during voice communication. As a result, even while voice is being exchanged with the counterpart wireless communication device 2, the voice can be encoded using an appropriate encoding method according to the communication status of the wireless communication. It is possible to achieve good voice communication by suppressing the influence of the.

[Second Embodiment]
Next, with reference to FIG. 5, the radio | wireless communication apparatus concerning the 2nd Embodiment of this invention is demonstrated. FIG. 5 is a sequence diagram showing an encoding method switching operation of the wireless communication apparatus according to the second embodiment of the present invention, and the same or equivalent parts as those in FIG.

  In the first embodiment, a case has been described in which the generation of noise is suppressed by shortening the transmission / reception interval of control data when switching the encoding method. In the present embodiment, a case will be described in which the other wireless communication apparatus is instructed to stop outputting audio during the encoding method switching period. The configurations of the wireless communication device 1 and the counterpart wireless communication device 2 are the same as those in FIG. 1 described above, and a detailed description thereof is omitted here.

  When CVSD is selected as a new encoding method in step 102, the control unit 19 of the wireless communication apparatus 1 issues a voice output stop instruction for instructing voice output stop via the wireless I / F unit 13 and the wireless line 3. Is transmitted to the counterpart wireless communication device 2 (step 203), and the voice processing unit 12 is instructed to stop the voice output (step 204). Thereby, the voice data from the counterpart wireless communication device 2 is decoded into the voice signal by the voice processing unit 12 but is not output to the telephone line 4.

  On the other hand, when the control unit 23 of the counterpart wireless communication device 2 receives the voice output stop instruction from the wireless communication device 1 by the wireless I / F unit 21, the control unit 23 instructs the voice processing unit 22 to stop the voice output. (Step 205), a response is transmitted from the wireless I / F unit 21 to the wireless communication apparatus 1 via the wireless line 3 (Step 106). As a result, the audio data from the wireless communication apparatus 1 is decoded into an audio signal by the audio processing unit 22 but is not output from the speaker 24.

  In response to this response, the control unit 19 of the wireless communication device 1 issues a connection instruction for a voice communication link for exchanging voice using the new CVSD encoding method selected by the encoding method switching unit 15. / F unit 13 and the wireless communication device 2 via the wireless line 3 (step 107), and notifies the audio processing unit 12 of the CVSD encoding method selected by the encoding method switching unit 15 Then, CVSD is set as an encoding method used for speech encoding (step 108).

  On the other hand, when the control unit 23 of the counterpart wireless communication device 2 receives the voice communication link connection instruction from the wireless communication device 1 by the wireless I / F unit 21, the CVSD code designated by the voice communication link connection instruction The CVSD is set as the encoding method used for the audio encoding in the audio processing unit 22 (step 109), and then the wireless I / F unit 21 transmits to the wireless communication device 1 via the wireless line 3. A response is transmitted (step 110).

In response to this response, the control unit 19 of the wireless communication device 1 transmits a voice output restart instruction to the counterpart wireless communication device 2 via the wireless I / F unit 13 and the wireless line 3 (step 211), and voice processing The unit 22 is instructed to resume audio output (step 212). As a result, the voice from the counterpart wireless communication device 2 is output to the telephone line 4.
On the other hand, when the control unit 23 of the counterpart wireless communication device 2 receives the voice output restart instruction from the wireless communication device 1 by the wireless I / F unit 21, the control unit 23 instructs the voice processing unit 22 to restart the voice output. (Step 213), a response is transmitted from the wireless I / F unit 21 to the wireless communication apparatus 1 via the wireless line 3 (Step 114). Thereby, the sound from the wireless communication device 1 is output from the speaker 24.

As described above, in the present embodiment, the control unit 19 of the wireless communication device 1 instructs the counterpart wireless communication device 2 to stop outputting the audio only during the encoding method switching period. Since the audio output is stopped only during the period from the time T1 in step 205 to the time T2 in step 213, that is, the encoding system switching period, noise accompanying the switching of the encoding system is not output from the speaker 24, and the voice communication is in progress. Noise generated at the time of switching the encoding method can be suppressed.
As a result, even while voice is being exchanged with the counterpart wireless communication device 2, the voice can be encoded using an appropriate encoding method according to the communication status of the wireless communication. It is possible to achieve good voice communication by suppressing the influence of the.

In addition, since the audio output from the counterpart wireless communication device 2 is stopped by the control unit 19 of the wireless communication device 1, the audio output is stopped only during the encoding method switching period. The accompanying noise is not output to the telephone line 4, and the noise generated when switching the encoding method during voice communication can be suppressed.
In the present embodiment, the case where voice output is stopped in both the partner wireless communication device 2 and the wireless communication device 1 has been described. However, the present embodiment is not limited to this, and depends on the system configuration and the form of voice communication. Thus, either one of the counterpart wireless communication device 2 and the wireless communication device 1 may stop the sound output for the encoding method switching period.

[Extended embodiment]
In each of the above embodiments, the case where Bluetooth is used as a wireless communication method has been described as an example. However, the present invention is not limited to this, and even when another wireless communication method such as a wireless LAN is used, the same as described above. Each embodiment can be applied, and similar effects can be obtained.
In each embodiment, the case where the wireless communication device 1 and the counterpart wireless communication device 2 are a wireless master device and a wireless slave device constituting the wireless telephone device has been described as an example. However, the present invention is not limited to this. As long as it is a device that transmits and receives encoded speech via a wireless line, each embodiment can be applied in the same manner as described above, and the same effects can be obtained.

Further, in each embodiment, since the encoding method is changed based on the communication status of wireless communication, when exchanging audio with the counterpart wireless communication device 2, it corresponds to the communication status of the wireless communication. Voice can be encoded by an appropriate encoding method, and it is possible to realize good voice communication while suppressing the influence of the wireless communication status.
Further, as shown in step 213 of FIG. 5, even when the communication status is improved in a state where the encoding method when the communication status is bad is selected, the current encoding method is continuously used. As a result, it is possible to avoid the occurrence of noise and voice interruption due to the change of the encoding method after the establishment of the voice communication link. At this time, since the communication situation is improved, even if the CVSD encoding method is continuously used, for example, there is no problem in the voice call. Note that the coding method may be changed to a coding method with high voice quality such as μ-law or A-law according to the improvement of the communication status.

Note that the encoding method is changed according to the user's operation detected by the operation input unit 16 or according to the user's operation detected by the operation detection unit 26 and notified from the counterpart wireless communication device 2. Thus, the control unit 19 may switch the encoding method. In particular, the communication quality that users perceive for voice communication varies depending on the individual user, so there are users who feel that communication quality has deteriorated even in communication situations that do not fall below the threshold. . If the coding method is switched according to the user's operation, the best coding method for the user can be arbitrarily selected.
Further, instead of the user selecting the encoding method by operation, the user may be able to change the setting of the threshold value itself. As a result, the encoding method can be automatically switched in a communication situation according to the user's preference.

  In each embodiment, the case where an appropriate encoding method is selected according to the communication status at the time of switching has been described as an example. However, the present invention is not limited to this, and the encoding is performed based on the past communication status history. May be selected. For example, when another wireless device is used at a predetermined time and the communication status deteriorates for a certain period, the encoding method used for the period is stored in the storage unit 18 and the period is reached. May automatically select a stored encoding method. When the communication status fluctuates significantly, the encoding method may be selected based on the statistical value calculated from the communication history change history for a certain period in the past, and the encoding method can be selected stably.

It is a block diagram which shows the structure of the radio | wireless communication apparatus concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the encoding system switch operation | movement of the radio | wireless communication apparatus concerning the 1st Embodiment of this invention. It is a flowchart which shows the encoding system selection process of the radio | wireless communication apparatus concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the change operation | movement of a control data transmission / reception space | interval. It is a sequence diagram which shows the encoding system switching operation | movement of the radio | wireless communication apparatus concerning the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wireless communication apparatus (radio | wireless main | base station / main body) 11 ... Line | wire I / F part, 12 ... Audio | voice processing part, 13 ... Wireless | wireless I / F part, 14 ... Communication condition detection part, 15 ... Coding system switching part, DESCRIPTION OF SYMBOLS 16 ... Operation input part, 17 ... Display part, 18 ... Memory | storage part, 19 ... Control part, 10 ... Internal bus, 2 ... Counterpart radio | wireless communication apparatus (wireless cordless handset / handset), 21 ... Wireless I / F part, 22 ... Audio processing unit, 23 ... control unit, 24 ... speaker, 25 ... microphone, 26 ... operation input unit, 27 ... display unit, 28 ... storage unit, 20 ... internal bus, 3 ... wireless line, 4 ... phone line, 5 ... Telephone network, 6 ... Counter telephone equipment.

Claims (3)

A wireless communication device that transmits and receives audio encoded using an arbitrary encoding method by wireless communication with a counterpart wireless communication device,
A radio having a control unit that switches to a different encoding method by transmitting and receiving control data to and from the counterpart wireless communication device, and shortens a transmission / reception interval of the control data when the encoding method is switched. Communication device. A wireless communication device that transmits and receives audio encoded using an arbitrary encoding method by wireless communication with a counterpart wireless communication device,
The original encoding method is switched to a different encoding method by transmitting / receiving control data to / from the counterpart wireless communication device, and the voice is output to the counterpart wireless communication device during the switching period of the encoding method. A wireless communication apparatus comprising a control unit for instructing a stop. The wireless communication device according to claim 1,
The wireless communication device, wherein the control unit instructs the counterpart wireless communication device to stop the output of the voice during a coding method switching period.

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