JP5141361B2 - Vehicle system and program - Google Patents

Description

  The present invention relates to a vehicle system and a program.

  Portable navigation devices are in widespread use. Some of these portable navigation devices can be detachably attached to a vehicle. Therefore, for example, a single portable navigation device can be used for a plurality of vehicles. Alternatively, various settings of the navigation device can be set at any location outside the vehicle (such as in the office or at home). Thereby, setting work can be performed easily. Thus, the portable navigation device has various advantages compared to the non-portable navigation device.

  Further, Patent Document 1 discloses a navigation device that uses voice recognition for place name search, although it is not portable. By using such a voice recognition function, the burden on the operator (driver) during driving can be reduced.

JP 2000-89782 A

  Here, consider a case where a microphone (hereinafter abbreviated as a microphone) is incorporated in a portable device (described as a navigation device in the specification) as described above. 10 and 11 are diagrams illustrating a state in which a navigation device incorporating a microphone is mounted on a vehicle.

  FIG. 10 shows a state in which the portable device (the navigation device body 50 in the specification) is attached to the side of the driver's seat. In such a state, the built-in microphone 51 is far from the driver's mouth, and the voice input function is almost difficult to use. FIG. 11 shows a state where the portable navigation device body 50 is attached at a distance close to the driver's mouth. In such a state, confirmation of the forward field of view and instruments is hindered. Therefore, when the vehicle is mounted, it is difficult for the portable navigation device body 50 to acquire sound from the microphone.

  The present invention has been made under such a background, and provides a vehicle system and a program capable of bringing a microphone for voice input into an appropriate state when the vehicle is mounted and when the vehicle is not mounted. With the goal.

The present invention includes a portable device having a first microphone, and mounting means for detachable installation capable portable device to the vehicle, a second microphone connected to the mounting means, the first or connecting and selecting means for selecting a second one of the microphones, a mounting and dismounting detecting means for detecting a connection state between the mounting means and the portable device, a detachment state detection means portable device and placing means when it detects the first microphone to the input state and the second microphone with a non-input state, when the first microphone is selected by the selection means, detachment state detection means and the portable device even when the mounting means has detected the connected state, the first microphone to the input state, comprising a microphone switching processing means for the second microphone and the non-input state, a Speech recording parameters of the first and second microphone includes a noise canceling parameters, a vehicle system, characterized in that the microphone switching process means the noise cancellation parameter, changing to optimize the side of the microphone as an input state It is.

At this time, the second microphone can have a narrower directivity than the first microphone .

Further, the second microphone can have a frequency characteristic of a microphone having a narrower band than the first microphone .

The present invention can also be viewed from the viewpoint of a program. That is, the present invention provides a mounting means for detachably attaching a first microphone or a portable device included in a portable device that can be installed in a vehicle to the information processing device by installing the information processing device. A selection function for selecting any one of the connected second microphones, an attachment / detachment state detection function for detecting a connection state between the placement means and the portable device, and a removal / attachment state detection function for the portable device and the placement means. when detecting a connection of a, a first microphone as an input state and the second microphone with a non-input state, when the first microphone is selected by the selection function, variable attachment and detachment state detection function even when the transportable device and placing means has detected the connected state, the first microphone to the input state, My to the second microphone and the non-input state And Rofon switching processing function is realized, speech recording parameters of the first and second microphone includes a noise canceling parameters, a microphone switching processing function the noise cancellation parameter, so as to be optimal for the side of the microphone as an input state It is a program characterized by changing to.

  ADVANTAGE OF THE INVENTION According to this invention, the microphone for audio | voice input can be made into an appropriate state at the time of vehicle mounting and the time of non-vehicle mounting.

(First embodiment)
A navigation system 23 according to the first embodiment will be described with reference to FIGS. The navigation system 23 is an automobile system in which the portable navigation device main body 20 can be attached to and detached from the vehicle placement unit 21. Moreover, the mounting means referred to in the claims is the vehicle mounting portion 21, and the portable device is the navigation device body 20.

  FIG. 1 is a block diagram of the navigation system 23 according to the first embodiment. FIG. 2 is a diagram for explaining the state of noise under a microphone use environment. FIG. 3 is a diagram for explaining the effect of noise cancellation. FIG. 4 is a diagram for explaining the navigation device body 20 and the vehicle placement unit 21. FIG. 5 is a diagram showing the navigation system 23 mounted on a vehicle. FIG. 6 is a flowchart showing a microphone switching procedure in the navigation system 23 shown in FIG.

(Description of main parts)
In the following description, the configuration of the main part of the present invention will be described first. As shown in FIG. 1, the navigation system 23 according to the first embodiment includes a voice recognition processing unit 7 that recognizes voice acquired by the built-in microphone 4 or the in-vehicle microphone 10. In addition, a central processing unit 5 that operates according to instructions included in the recognition result of the speech recognition processing unit 7 is provided.

  Moreover, the navigation system 23 of 1st embodiment equips the vehicle side with the vehicle mounting part 21 which makes the navigation apparatus main body 20 removable. Moreover, the built-in microphone 4 built in the navigation apparatus main body 20 and the vehicle-mounted microphone 10 attached to the vehicle mounting part 21 are provided. Furthermore, an attachment / detachment detection processing unit 2 that detects a connection state between the vehicle placement unit 21 and the navigation apparatus body 20 is provided.

  When the attachment / detachment detection processing unit 2 detects the connection between the navigation device main body 20 and the vehicle placement unit 21, the microphone switching processing unit 11 disconnects the navigation device main body 20 and the built-in microphone 4 (becomes a non-input state). ) And the navigation apparatus body 20 and the in-vehicle microphone 10 are connected (become in an input state). At the same time, the microphone switching processing unit 11 optimizes the sound recording parameters optimized for the built-in microphone 4 for the in-vehicle microphone 10.

  The audio recording parameter is, for example, a parameter related to noise cancellation. That is, the environment in which the in-vehicle microphone 10 is used is often when the vehicle is running. On the other hand, the environment in which the built-in microphone 4 is used is often outside the vehicle or when the vehicle is stopped. Therefore, the noise level and the nature of the noise differ between when the in-vehicle microphone 10 is used and when the built-in mile 4 is used. Therefore, it is preferable to change a parameter related to noise cancellation between when the in-vehicle microphone 10 is used and when the built-in microphone 4 is used.

  It is also preferable to change the directivity-related parameter as the sound recording parameter. For example, the built-in microphone 4 has a wide directivity, whereas the in-vehicle microphone 10 has a narrow angle. That is, the built-in microphone 4 is used mainly when not in a vehicle. When not on-vehicle, the environment is quieter than when on-vehicle. Therefore, it is less likely to pick up noise. Thereby, there is no problem even if the directivity is wide angle. In addition, when the vehicle is not mounted, the user is in a room such as a company or home. Therefore, the range in which the user can move is wide. Therefore, the audio signal does not always come only from the front position of the built-in microphone 4. For this reason, the directivity should be a wide angle.

  On the other hand, when the vehicle-mounted microphone 10 is used, the position of the user (driver) is also constant. For this reason, wide-angle directivity is not required. Moreover, the range in which the vehicle-mounted microphone 10 picks up noise can be narrowed by setting the directivity to a narrow angle. Therefore, it is also effective as a noise countermeasure.

  In addition, it is conceivable to change the parameter of frequency characteristics between the in-vehicle microphone 10 and the built-in microphone 4. The frequency characteristic of the in-vehicle microphone 10 is made narrower than the frequency characteristic of the built-in microphone 4. At this time, if the frequency band of noise is determined, it is preferable that the frequency band is not picked up.

(Overall configuration of navigation system 23 and description of each part)
Below, the navigation system 23 of 1st embodiment is demonstrated in detail. As shown in FIG. 1, the navigation system 23 according to the first embodiment mainly includes a portable navigation device main body 20 and a vehicle placement unit 21.

  The vehicle placement unit 21 is also called a cradle. The cradle also plays a role of stably holding the navigation device body 20 when various settings of the navigation device body 20 are performed while charging.

  When the navigation device body 20 is placed on the vehicle placement unit 21, the connection connector 1 sends a control signal to the attachment / detachment detection processing unit 2, the central processing unit 5, and the microphone switching processing unit 11. The connection connector 1 is detachably connected to the connection connector 8 of the vehicle placement portion 21.

  The attachment / detachment detection processing unit 2 detects whether the connection connector 1 is connected to the vehicle placement unit 21. This detection result is sent to the central processing unit 5 as a detection signal.

  The display device 3 performs control communication with the central processing unit 5 and performs various displays. The built-in microphone 4 is a microphone built in the navigation device body 20. The built-in microphone 4 has a wide-angle directivity.

  The central processing unit 5 receives the supply of power from the connection connector 1 through the power supply line and distributes the power to each unit. The wiring for power distribution from the central processing unit 5 to each unit is not shown. The central processing unit 5 receives a detection signal from the attachment / detachment detection processing unit 2 and recognizes whether the navigation device body 20 is connected to the vehicle placement unit 21. The central processing unit 5 transmits a control signal for microphone switching processing to the microphone switching processing unit 11. The central processing unit 5 receives an audio signal from the built-in microphone 4 or the in-vehicle microphone 10 via the microphone switching processing unit 11. Then, control communication including the voice signal is performed with the voice recognition processing unit 7. The central processing unit 5 performs control communication for the display device 3 to perform various displays. The central processing unit 5 performs control communication with the external storage device 6 and acquires various types of information from the external storage device 6. In particular, processing corresponding to the language recognized by the speech recognition processing unit 7 is acquired from the external storage device 6 and displayed on the display device 3. Since the voice recognition technique is a known technique, detailed description thereof is omitted.

  The voice recognition processing unit 7 performs control communication with the central processing unit 5 and receives a voice signal from the built-in microphone 4 or the in-vehicle microphone 10. The voice recognition processing unit 7 performs voice recognition of the voice signal and transmits the recognition result to the central processing unit 5.

  The connection connector 8 is detachably connected to the connection connector 1 and supplies power from the battery 9 to each unit via the central processing unit 5 of the navigation device body 20. Further, the connection connector 8 transmits the audio signal of the in-vehicle microphone 10 to the microphone switching processing unit 11 via the connection connector 1. Further, the connection connector 8 transmits a control signal from the external controller 12 to the central processing unit 5.

  The battery 9 supplies power to the navigation apparatus body 20 via the connection connector 8 and the connection connector 1. This power source becomes an operating power source when the navigation device body 20 is in operation, and becomes a charging power source when the navigation device main body 20 is at rest.

  The external controller 12 is a speech button, for example, and is operated when the driver gives an instruction by voice. Alternatively, a button for performing an operation such as switching the display mode of the display device 3 is provided.

  The microphone switching processing unit 11 performs processing for connecting either the built-in microphone 4 or the in-vehicle microphone 10 to the central processing unit 5. When the microphone switching processing unit 11 selects the in-vehicle microphone 10, a noise canceling parameter for in-vehicle use is selected. In addition, since the noise cancellation technique can use the existing technique, detailed description is abbreviate | omitted. As shown in FIG. 2, even if the audio signal level and the noise level are substantially the same level, the noise level can be reduced below the audio signal level by using noise cancellation as shown in FIG.

  As shown in FIG. 4, the connection connector 8 includes a ground terminal (GND) 8-1, a power supply terminal (BATT) 8-2, a microphone terminal (MIC) 8-3, and a control terminal (CTRL) 8-4. The

  As shown in FIG. 5, the in-vehicle microphone 10 is provided at a position close to the driver's mouth. In the example of FIG. 5, it is provided at the top of the console panel. However, the mounting position can be freely selected, such as being provided on a sun visor or pillar. The in-vehicle microphone 10 can be easily attached using a double-sided tape or a clip. In the example of FIG. 5, illustration of wiring between the in-vehicle microphone 10 and the external controller 12 and the navigation device body 20 is omitted.

  The directivity of the built-in microphone 4 is wider than the directivity of the in-vehicle microphone 10. The directivity of the in-vehicle microphone 10 is narrower than the directivity of the built-in microphone 4. The reason is as described above.

  Next, the microphone switching procedure will be described with reference to FIG. FIG. 6 is a flowchart showing a microphone switching procedure in the navigation system 23 of the first embodiment. As shown in FIG. 6, the attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8) to the connection connector 1 (step S1). As a result, when it is detected that it is connected to the vehicle placement unit 21 (Yes in step S2), the attachment / detachment detection processing unit 2 transmits an in-vehicle detection signal to the central processing unit 5 (step S3). The central processing unit 5 transmits a predetermined control signal to the microphone switching processing unit 11. The microphone switching processing unit 11 receives the control signal and sets the microphone switching destination as the in-vehicle microphone 10 (step S4).

  Moreover, the attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8) to the connection connector 1 (step S1), and as a result, detects whether it is connected to the vehicle placement unit 21 or not. (Step S2). As a result of this detection, when it is detected that it is not connected to the vehicle placement unit 21 (No in step S2), the attachment / detachment detection processing unit 2 detects whether or not the microphone connection destination is the in-vehicle microphone 10. (Step S5). When the connection destination is the in-vehicle microphone 10 (Yes in step S5), the attachment / detachment detection processing unit 2 transmits a non-in-vehicle detection signal to the central processing unit 5 (step S6). The central processing unit 5 transmits a predetermined control signal to the microphone switching processing unit 11. The microphone switching processing unit 11 receives this control signal and sets the microphone switching destination as the built-in microphone 4 (step S7).

  If it is determined in step 5 that the microphone connection destination is already the built-in microphone 4 (No in step S5), the attachment / detachment detection processing unit 2 ends the attachment / detachment detection process.

(Second embodiment)
A navigation system 23A according to a second embodiment will be described with reference to FIGS. FIG. 7 is a block diagram of the navigation system 23A of the second embodiment. FIG. 8 is a diagram for explaining the navigation device main body 20A and the vehicle placement unit 21 according to the second embodiment. FIG. 9 is a flowchart showing a microphone switching procedure in the navigation system 23A of the second embodiment. In addition, the same code | symbol is attached | subjected to the function same or the same kind as the function in 1st embodiment, and the description is abbreviate | omitted or simplified.

  In 2nd embodiment, the microphone selection switch 40 which selects either the built-in microphone 4 or the vehicle-mounted microphone 10 is provided. Thereby, even when the attachment / detachment detection processing unit 2 detects a state in which the navigation device body 20 and the vehicle placement unit 21 are connected, when the microphone selection switch 40 selects the built-in microphone 4, The attachment / detachment detection processing unit 2 transmits a detection signal indicating that the navigation device body 20 </ b> A and the vehicle placement unit 21 are not connected to the central processing unit 5.

  As a result, the central processing unit 5 that has received this detection signal continues to connect the navigation device body 20A and the built-in microphone 4 to the microphone switching processing unit 11 (becomes in an input state). A control signal is transmitted so that the terminal 10 is disconnected (becomes a non-input state).

  That is, as shown in FIG. 9, the attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8) to the connection connector 1 (step S10). As a result, when it is detected that it is connected to the vehicle placement unit 21 (Yes in Step S11) and it is confirmed that the microphone selection switch 40 is on the in-vehicle microphone 10 side (No in Step S12), the attachment / detachment detection processing unit 2 transmits the in-vehicle detection signal to the central processing unit 5 (step S13). The central processing unit 5 transmits a predetermined control signal to the microphone switching processing unit 11. Upon receiving this control signal, the microphone switching processing unit 11 sets the microphone switching destination to the in-vehicle microphone 10 (step S14).

  The attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8) to the connection connector 1 (step S10). As a result, when it is detected that it is connected to the vehicle placement unit 21 (Yes in Step S11) and it is confirmed that the microphone selection switch 40 is on the built-in microphone 4 side (Yes in Step S12), the attachment / detachment detection processing unit 2 displays on the display device 3 an instruction to switch the microphone selection switch 40 to the in-vehicle microphone 10 (step S20). If there is a switching by this (Yes of step S21), the attachment / detachment detection process part 2 will transfer to step S13. However, even if the predetermined time has elapsed (Yes in step S22), if there is no switching (No in step S21), the attachment / detachment detection processing unit 2 is already on the built-in microphone 4 side, and thus the attachment / detachment detection processing is terminated.

  The attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8) to the connection connector 1 (step S10). As a result, it is detected that it is not connected to the vehicle placement unit 21 (No in Step S11), and it is confirmed that the microphone selection switch 40 is not on the in-vehicle microphone 10 side (No in Step S15). Is the in-vehicle microphone 10 (Yes in step S16), the attachment / detachment detection processing unit 2 transmits a non-in-vehicle detection signal to the central processing unit 5 (step S17). The central processing unit 5 transmits a predetermined control signal to the microphone switching processing unit 11. The microphone switching processing unit 11 receives this control signal and sets the microphone switching destination as the built-in microphone 4 (step S18).

  The attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8) to the connection connector 1 (step S10). As a result, it is detected that it is not connected to the vehicle placement unit 21 (No in step S11), and when the microphone connection destination at this time is already the built-in microphone 4 (No in step S16), it is attached / detached. The detection processing unit 2 ends the attachment / detachment detection process.

  The attachment / detachment detection processing unit 2 monitors the connection state of another connector (connection connector 8 or 18) with respect to the connection connector 1 (step S10). As a result, when it is detected that it is not connected to the vehicle placement unit 21 (No in step S11) and it is confirmed that the microphone selection switch 40 is on the in-vehicle microphone 10 side (Yes in step S15), the attachment / detachment detection processing unit 2 displays on the display device 3 an instruction to switch the microphone selection switch 40 to the built-in microphone 4 (step S19). Accordingly, if there is switching (Yes in step S21), the attachment / detachment detection processing unit 2 transitions to step S17. However, even if the predetermined time has elapsed (Yes in Step S22), if there is no switching (No in Step S21), the attachment / detachment detection processing unit 2 is already on the in-vehicle microphone 10 side, and thus the attachment / detachment detection process is terminated.

In this case, both the built-in microphone 4 and the in-vehicle microphone 10 are not connected. Therefore, in a situation where it is not desired to use the voice recognition function, the microphone selection switch 40 may be on the in-vehicle microphone 10 side, and the navigation device body 20A may be removed from the vehicle placement portion 21. However, in order to prevent such a setting from being made accidentally, it is desirable to forcibly switch to the built-in microphone 4 side even if the microphone selection switch 40 is on the in-vehicle microphone 10 side. In addition, it is desirable to warn the user by displaying that fact on the display device 3.
(Example of the program)

  An example of a program for realizing each function in the navigation systems 23 and 23A of the present embodiment by installing in the information processing apparatus will be described. Here, the information processing apparatus is a general-purpose computer apparatus. The general-purpose computer device is, for example, a CPU (Central Processing Unit).

  By recording the program of this embodiment on a recording medium, the information processing apparatus can install the program of this embodiment using this recording medium. Alternatively, the program of the present embodiment can be directly installed on the information processing apparatus from the server holding the program of the present embodiment via the network.

  Thereby, the functions of the attachment / detachment detection processing unit 2, the central processing unit 5, the voice recognition processing unit 7, and the microphone switching processing unit 11 in the navigation systems 23 and 23A of the present embodiment can be realized using the information processing apparatus. . Note that other functions that can be realized by software may also be realized by the program of this embodiment.

  The program of this embodiment includes not only a program that can be directly executed by the information processing apparatus but also a program that can be executed by being installed on a hard disk or the like. Also included are those that are compressed or encrypted.

(Usage form)
A usage pattern of the navigation systems 23 and 23A according to the embodiment of the present invention described above will be described. The navigation systems 23 and 23A of the present embodiment can use the voice recognition function both when in-vehicle and when not in-vehicle. At this time, since it is possible to operate with an operator's finger when not on-vehicle, it can be considered that the usefulness of the voice recognition function is low.

  However, in recent years, navigation devices have become more and more multifunctional, and there are many models having various functions such as being capable of receiving terrestrial digital broadcasting and having a game function while being navigation devices.

  In the case of such a multi-function model, the voice recognition function is useful as a remote control function when placed in the room of a company or home. For example, when receiving a terrestrial digital broadcast, the navigation device main body 20 or 20A placed remotely from the operator can be remotely operated by saying “TV on”, “TV off”, “Channel 1”, etc. can do.

  When the vehicle is mounted, the voice recognition process is set to start only after the utterance button of the external controller 12 is operated. However, the speech button may not be provided. In addition, when the voice recognition function is used as a remote control function in a room or the like, a setting may be made such that the voice recognition process is automatically started by an operator's speech.

    The above embodiment has been described by taking the car navigation system as an example, but it can also be used for ships and the like. In this case, the vehicle placement unit 21 is a ship placement unit or other placement unit.

(Other embodiments)
The gist of the present invention is that the vehicle mounting unit 21 detects the in-vehicle state (in-vehicle or non-in-vehicle) of an in-vehicle device such as the navigation device body 20 or 20A, and switches between the built-in microphone 4 and the in-vehicle microphone 10 accordingly. By the way. Therefore, the present invention can be variously modified without departing from the gist of the present invention.

  For example, in the above embodiment, the navigation system 23 or 23A has been described. In this case, the built-in microphone 4 and the in-vehicle microphone 10 are used for voice recognition. Here, considering the case where the navigation device body 20 is replaced with a mobile phone terminal, and the vehicle placement unit 21 is replaced with a device for placing the mobile phone terminal, the built-in microphone 4 and the in-vehicle microphone 10 are respectively portable. Used for hands-free use of telephone terminals.

It is a block block diagram of the navigation system of 1st embodiment. It is a figure for demonstrating the condition of the noise under the microphone use environment in the navigation system shown in FIG. It is a figure for demonstrating the effect of the noise cancellation with respect to the microphone in the navigation system shown in FIG. It is a figure for demonstrating the navigation apparatus main body and vehicle mounting part in the navigation system shown in FIG. It is a figure which shows the state by which the navigation system shown in FIG. 1 was mounted. It is a flowchart which shows the microphone switching procedure in the navigation system shown in FIG. It is a block block diagram of the navigation system of 2nd embodiment. It is a figure for demonstrating the navigation apparatus main body and vehicle mounting part in the navigation system shown in FIG. It is a flowchart which shows the microphone switching procedure in the navigation system shown in FIG. It is a figure which shows the state which mounted the conventional navigation apparatus. It is a figure which shows the other state which mounted the conventional navigation apparatus on board.

Explanation of symbols

1, 8 Connector 2 Attachment / detachment detection processing unit (attachment / detachment detection processing means)
3 Display devices 4 and 51 Built-in microphone (first microphone)
5 Central processing unit (means that operates according to instructions)
6 External storage device 7 Voice recognition processing unit (voice recognition means)
8-1 Grounding terminal 8-2 Power supply terminal 8-3 Microphone terminal 8-4 Control terminal 9 Battery 10 Car-mounted microphone (second microphone)
11 Microphone switching processing unit (microphone switching processing means)
12 External controller 20, 20A, 50 Navigation device body (portable navigation device)
21 Vehicle placement portion (vehicle placement means, vehicle placement device)
23, 23A Navigation system 40 Microphone selection switch (switch means)

Claims (4)

A portable device with a first microphone;
And mounting means for the detachable the portable device capable of installation in a vehicle,
A second microphone connected to said mounting means,
Selecting means for selecting either the first or second microphone;
A mounting and dismounting detecting means for detecting a connection state between the portable device and the mounting means,
Wherein when the detachment state detecting means detects the connection with the mounting means and the portable device, the first microphone and the input state of the second microphone with a non-input state, the first When the microphone is selected by the selection unit, the first microphone is used even when the attachment / detachment state detection unit detects a state in which the portable device and the placement unit are connected. A microphone switching processing means for setting the second microphone to a non-input state ,
With
The audio recording parameters of the first and second microphones include noise cancellation parameters;
The vehicle switching system is characterized in that the microphone switching processing means changes the noise cancellation parameter so as to be optimal for the microphone on the input side . The vehicle system according to claim 1,
The vehicle system, wherein the second microphone has a narrower directivity than the first microphone. The vehicle system according to claim 1,
The vehicle system according to claim 2, wherein the second microphone has a frequency characteristic of a microphone having a narrower band than the first microphone. By installing on an information processing device,
A selection function for selecting one of a first microphone provided in a portable device that can be installed in a vehicle or a second microphone connected to a mounting means that makes the portable device detachable;
A mounting and dismounting detecting function of detecting a connection state between the portable device and the mounting means,
Wherein when the detachment state detection function detects the connection with the mounting means and the portable device, the first microphone and the input state of the second microphone with a non-input state, the first When the microphone is selected by the selection function, the first microphone can be used even if the attachment / detachment state detection function detects a state in which the portable device and the placement unit are connected. A microphone switching processing function for setting the second microphone to a non-input state ,
Realized,
The audio recording parameters of the first and second microphones include noise cancellation parameters;
The microphone switching processing function changes the noise cancellation parameter so as to be optimal for a microphone on an input state side .

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