A Voice Interaction Method, Device and Vehicle in an In-vehicle Conference Scenario

Abstract

The present invention provides a voice interaction method, device and vehicle in an in-vehicle conference scenario. When entering the listening mode, it acquires the first voice information of the user collected by the in-vehicle microphone and recognizes the first voice information, so as to determine whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from a pre-acquired microphone status library. When it is determined that there is a corresponding microphone trigger instruction, the microphone trigger instruction is sent to the conference application program of the conference terminal to control the conference application program of the conference terminal to perform an operation of enabling or disabling the conference microphone permission. In the scenario where the vehicle passengers hold a remote conference, it can reduce the problem that the passengers need to manually enable the conference microphone permission through voice interaction, thus bringing convenience to the passengers.

Description

Technical Field

[0001] The present invention relates to the technical field of in-vehicle entertainment audio, and particularly to a voice interaction method, device and vehicle in an in-vehicle conference scenario. Background Art

[0002] With the popularization of remote work, online office software such as Zoom, Feishu, Tencent Meeting, and DingTalk also has very powerful remote work capabilities, among which the online meeting function is essential.

[0003] In order to make better use of the time spent in the vehicle, more and more passengers choose to conduct online meetings in the vehicle. When a passenger conducts a meeting in the vehicle, they need to manually turn on the meeting microphone permission when speaking and manually turn off the meeting microphone permission when muting (by manually operating the microphone button of the meeting software). This operation is very cumbersome and brings inconvenience to the passengers, especially for passengers with inconvenient hands.

[0004] On the other hand, when the passengers in the vehicle use the in-vehicle built-in meeting software to conduct an online meeting, the passengers need to manually operate the meeting microphone permission during the meeting, which brings great inconvenience to the passengers. Especially when the in-vehicle built-in meeting software runs on the central control screen near the front driver's seat, it is very inconvenient for the rear passengers to operate manually. Summary of the Invention

[0005] In view of this, the present invention provides a voice interaction method, device and vehicle in an in-vehicle conference scenario to solve the problem that passengers need to manually operate the meeting microphone permission during the in-vehicle online meeting process, which brings inconvenience to the passengers.

[0006] The first aspect of the present invention provides a voice interaction method in an in-vehicle conference scenario, including:

[0007] When entering the listening mode, obtaining the first voice information of the user collected by the in-vehicle microphone;

[0008] Identifying the first voice information, and judging whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the pre-obtained microphone status library; wherein, the microphone trigger instruction includes turning on the meeting microphone permission and turning off the meeting microphone permission;

[0009] When there is a corresponding microphone trigger instruction, sending the microphone trigger instruction to the meeting application program of the meeting terminal to control the meeting application program of the meeting terminal to perform the operation of turning on the meeting microphone permission or turning off the meeting microphone permission.

[0010] The second aspect of the present invention provides a voice interaction device in an in-vehicle conference scenario, including:

[0011] A voice acquisition module, configured to obtain first voice information of a user collected by a vehicle-mounted microphone when entering a monitoring mode;

[0012] An identification module, configured to identify the first voice information, and determine whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from a pre-acquired microphone status library according to the recognition result of the first voice information; wherein, the microphone trigger instruction includes an instruction to turn on the conference microphone permission and an instruction to turn off the conference microphone permission;

[0013] An instruction sending module, configured to send the microphone trigger instruction to a conference application of the conference terminal when there is a corresponding microphone trigger instruction, so as to control the conference application of the conference terminal to perform an operation of turning on the conference microphone permission or turning off the conference microphone permission.

[0014] A third aspect of the present invention provides a vehicle, including a processor, a memory, and a computer program stored on the memory and capable of running on the processor. When the computer program is executed by the processor, it implements the voice interaction method in the vehicle-mounted conference scenario as described above.

[0015] Compared with the prior art, the voice interaction method, device, and vehicle provided by the present invention in the vehicle-mounted conference scenario have the following beneficial effects:

[0016] The present invention obtains first voice information of a user collected by a vehicle-mounted microphone when entering a monitoring mode, and identifies the first voice information, so as to determine whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from a pre-acquired microphone status library according to the recognition result of the first voice information. Thus, when it is determined that there is a corresponding microphone trigger instruction, the microphone trigger instruction is sent to a conference application of the conference terminal, so as to control the conference application of the conference terminal to perform an operation of turning on the conference microphone permission or turning off the conference microphone permission. It can reduce the problem that passengers need to manually operate the microphone in the scenario of passengers having a remote conference in the vehicle through voice interaction, thereby bringing convenience to passengers. Description of the Drawings

[0017] Figure 1 It is a flowchart of an embodiment of the voice interaction method in the vehicle-mounted conference scenario provided by the present invention. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] In the embodiments of the present application, a voice interaction method, device and vehicle in an in-vehicle conference scenario are proposed mainly for the scenario where it is inconvenient for passengers to manually open and close the conference microphone permission when having a conference in the vehicle.

[0020] Among them, at least one microphone should be configured on the in-vehicle device to support picking up the sounds in the vehicle. In one case, considering that the in-vehicle device may not be installed with a conference software, it is necessary to use the conference software on a third-party terminal to implement the function of an online conference. The third-party terminal can be devices such as a mobile phone or an iPad equipped with the conference software. In the present application, the in-vehicle microphone collects voice information and identifies whether it is a microphone trigger instruction, and interacts with the conference terminal to control the conference application program of the conference terminal to automatically open or close the conference microphone permission.

[0021] In order to reduce the computing amount of the in-vehicle system, after collecting the voice information, the in-vehicle microphone can also send it to the cloud for semantic recognition to extract keywords or key sentences. Then the cloud queries according to the recognition result of the voice information in the pre-stored microphone status library to check whether there is a corresponding microphone trigger instruction. When a corresponding microphone trigger instruction is found, the cloud sends the microphone trigger instruction to the in-vehicle device, and the in-vehicle device sends the instruction to the conference application program of the conference terminal.

[0022] Next, refer to Figure 1 The voice interaction method in the in-vehicle conference scenario provided by the embodiments of the present invention will be described. Among them, the voice interaction method in the in-vehicle conference scenario provided by the embodiments of the present invention is executed by the in-vehicle device and includes steps S11 to S13:

[0023] S11. When entering the listening mode, obtain the first voice information of the user collected by the in-vehicle microphone.

[0024] Among them, when the user gets in the vehicle, the in-vehicle microphone device is started so that the in-vehicle microphone monitors the sounds in the vehicle, that is, enters the listening mode.

[0025] Among them, the in-vehicle microphone should be the microphone corresponding to the participating passengers. Specifically, microphones are correspondingly arranged in the front driver's seat and the rear seats of the vehicle. When the participating passengers hold a meeting in the vehicle, the corresponding microphone is turned on, and the vehicle enters the monitoring mode, and the in-vehicle microphone picks up the voices of the participating users.

[0026] Specifically, if the vehicle head unit system has a corresponding in-vehicle meeting application program, the built-in meeting application program of the vehicle head unit is used; if the vehicle head unit does not have this function, when the user uses the meeting application program of a third-party terminal to participate in the meeting, the third-party terminal Bluetooth and the vehicle Bluetooth are connected, and the sound in the meeting application program of the third-party terminal can be played through the vehicle's sound system, and the user can also hear more clearly.

[0027] S12, recognize the first voice message, and determine whether there is a microphone trigger command corresponding to the recognition result of the first voice message in the pre-obtained microphone status library according to the recognition result of the first voice message; wherein, the microphone trigger command includes an open meeting microphone permission and a close meeting microphone permission.

[0028] Specifically, the voice recognition module of the vehicle head unit performs semantic recognition on the user's first voice message, and obtains the key information (keywords or key sentences) included in the voice recognition result. When recognizing, a pre-trained voice model can be called for recognition. For example, when the user says "ok, I'm done speaking, I'll mute first", the keywords "I'm done speaking" and "mute" are recognized through semantic recognition.

[0029] After recognizing the key information of the first voice message, query the key information of the first voice message in the microphone status library to determine whether there is a microphone trigger command corresponding to the key information of the first voice message. For example, by querying "I'm done speaking, mute", the corresponding microphone trigger command is found to be a close meeting microphone permission command.

[0030] Among them, the implementation method of the microphone status library can be: the user sets the key information for opening or closing the meeting microphone permission on the vehicle head unit interface to obtain the corresponding relationship between the key information and the operations performed by the meeting microphone, or it can be the microphone status library configured when the vehicle leaves the factory. At the same time, this microphone status library can be updated in real time as the vehicle head unit runs to improve the recognition accuracy of opening or closing the meeting microphone.

[0031] Step S13, when there is a corresponding microphone trigger command, send the microphone trigger command to the meeting application program of the meeting terminal to control the meeting application program of the meeting terminal to perform an operation of opening the meeting microphone permission or closing the meeting microphone permission.

[0032] Specifically, when the in-vehicle system installs a conferencing application and the user conducts an online meeting directly through the conferencing application installed on the in-vehicle system, the microphone trigger instruction is directly sent to the conferencing application on the in-vehicle system. If the in-vehicle system does not install a conferencing application or the user conducts an online meeting through the conferencing application on a third-party terminal, the microphone trigger instruction is sent to the conferencing application on the third-party terminal via in-vehicle Bluetooth.

[0033] In a possible scenario, when a passenger conducts an online meeting through a conferencing application on a third-party terminal, such as a mobile phone, if the passenger's hands are fatigued or inconvenient at this time, waking up the on / off of the conferencing microphone permission through voice interaction can bring great convenience to the passenger.

[0034] In another possible scenario, when a rear-seat passenger uses the in-vehicle built-in conferencing application for a meeting and the in-vehicle built-in conferencing application runs on the front-row center console screen, if the rear-seat passenger wants to speak during the meeting, the rear-seat passenger needs to click the conferencing microphone button on the center console screen to turn on the conferencing microphone. Since there is a certain distance between the rear-seat passenger and the center console screen, the operation of the rear-seat passenger to turn on the conferencing microphone permission will be restricted by the distance, bringing great inconvenience to the rear-seat passenger and even possibly interfering with the driver, thus unable to bring a good experience to the user. In the embodiments of the present invention, through voice interaction, the automatic on / off of the conferencing microphone permission is realized, greatly facilitating the user.

[0035] Based on the above-provided technical solution, when entering the listening mode, it obtains the first voice information of the user collected by the in-vehicle microphone and recognizes the first voice information, so as to judge whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the pre-obtained microphone status library according to the recognition result of the first voice information. Thus, when it is judged that there is a corresponding microphone trigger instruction, the microphone trigger instruction is sent to the conferencing application of the conferencing terminal to control the conferencing application of the conferencing terminal to perform the operation of turning on or off the conferencing microphone permission. It can reduce the problem that passengers need to manually operate the microphone through voice interaction in the scenario of in-vehicle passengers conducting a remote meeting, thus bringing convenience to the passengers.

[0036] Considering that different users have different idiomatic expressions for enabling and disabling the meeting microphone permission, different microphone status libraries can be set for different users in the embodiments of the present invention. In specific implementation, the user logs in to the personal account and establishes a personal microphone status library for the personal account. For example, when the user sets keywords or key sentences such as "Tom, you speak", "Tom, are you there", etc., the microphone of the meeting application is enabled; when setting keywords or key sentences such as "ok, finished speaking, I'll mute first", "I've said so much on my side", etc., the microphone of the meeting application is disabled.

[0037] Furthermore, in an optional implementation manner, after obtaining the first voice information of the user collected by the vehicle-mounted microphone, the user identity information is identified through the following steps:

[0038] Identify the user voiceprint of the first voice information and match it with the pre-stored user voiceprint library to identify the first user who emits the first voice information;

[0039] Then, determining whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the pre-obtained microphone status library according to the recognition result of the first voice information specifically includes:

[0040] Obtain the personal microphone status library of the first user, and determine whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the personal microphone status library according to the recognition result of the first voice information.

[0041] The above-provided implementation schemes are all based on the scenario where the user actively triggers the microphone. For further convenience, the present application also provides a scenario where the microphone of the meeting application is triggered passively during the online meeting of the passenger (that is, the other party participating in the meeting triggers the permission to turn on the meeting microphone at this end). Specifically, in an optional implementation manner, the method further includes:

[0042] Monitor the third voice information sent by the meeting terminal through the vehicle-mounted Bluetooth;

[0043] Identify the third voice information, and determine whether there is a microphone trigger instruction corresponding to the recognition result of the third voice information from the pre-obtained microphone status library according to the recognition result of the third voice information;

[0044] When there is a corresponding microphone trigger instruction, send the microphone trigger instruction to the meeting application of the meeting terminal to control the meeting application of the meeting terminal to perform the operation of enabling or disabling the meeting microphone permission.

[0045] When the in-vehicle infotainment (IVI) driver conducts an online meeting in the vehicle, since the IVI does not have a built-in meeting application at this time or the user directly uses the meeting application on the mobile phone side for the meeting, the in-vehicle Bluetooth and the Bluetooth of the meeting terminal (mobile phone side) should be connected to each other at this time. At this time, the in-vehicle Bluetooth will transmit the voice information of the other party participating in the meeting to the in-vehicle Bluetooth and play it through devices such as the in-vehicle audio. The voice information of the other party participating in the meeting is recognized and parsed by the IVI voice module as the third voice information, and the IVI system queries the recognition result of the voice information. Specifically, when the user establishes a personal microphone status library, they consider the scenario where the other party calls themselves, and set corresponding key information. For example, keyword sentences such as "Tom (my name), are you there?" and "Tom (my name), what's your opinion?" correspond to the microphone on state.

[0046] In an alternative embodiment, the voice interaction method in the in-vehicle meeting scenario provided by the embodiments of the present application further includes:

[0047] When there is a corresponding microphone trigger instruction, control the in-vehicle microphone to remind the user that they are about to start speaking or mute in a countdown manner.

[0048] When the IVI recognizes that there is a microphone trigger instruction, it notifies the user through a countdown plus a prompt tone that the meeting microphone will be turned on after a certain time (such as 3s, which the user can configure when setting the personal microphone status), and asks the user to get ready to speak. The IVI sends an instruction via Bluetooth to the meeting microphone on button of the third-party terminal meeting application, and the user can speak freely; if it is an in-vehicle built-in meeting application, send an instruction to the meeting application to start speaking.

[0049] In the embodiments of the present invention, the method of setting a countdown plus a prompt tone can not only remind the user, but also give the user time to correct in the scenario where the meeting microphone trigger recognition is incorrect.

[0050] Specifically, based on the above-provided technical solution of setting a countdown plus a prompt tone, in an alternative embodiment, the method further includes:

[0051] When it is recognized that there is a corresponding microphone trigger instruction for the user's first voice information and the user's second voice information is received during the in-vehicle microphone countdown playback period, recognize the second voice information;

[0052] When it is detected that the recognition result of the second voice information is a microphone trigger instruction and its trigger type is different from that of the first voice information, respond to the microphone trigger instruction corresponding to the second voice information. Among them, the trigger type includes the permission to turn on the meeting microphone and the permission to turn off the meeting microphone.

[0053] That is, when the in-vehicle unit notifies the user that the conference microphone permission will be enabled after a certain period of time through a countdown and a prompt tone, if the user issues a voice command to turn off the conference microphone permission, the conference microphone remains muted.

[0054] To improve the accuracy of microphone triggering, the embodiments of the present invention also update the personal microphone status library according to the user's feedback.

[0055] Specifically, after responding to the microphone trigger command corresponding to the second voice message, it further includes:

[0056] After the vehicle-mounted Bluetooth is disconnected or a meeting termination reminder is received from the conference application, ask the user whether to cancel the microphone trigger operation for the first voice message;

[0057] In response to the feedback result of the user's response to the cancellation query, determine whether to correct the microphone status library.

[0058] When the meeting ends, the third-party terminal Bluetooth device may be disconnected from the vehicle-mounted Bluetooth, or when the conference application ends running, a meeting termination reminder may be sent to the in-vehicle unit. After receiving this reminder command, the in-vehicle unit recognizes that the meeting has ended at this time and asks the user whether to cancel the microphone trigger operation for the first voice message. Specifically, when the in-vehicle unit recognizes that the first voice message is a command to enable the conference microphone permission and then recognizes that the second voice message is a command to turn off the conference microphone permission during the countdown playback period, at this time, the first voice message may be misrecognized and is a false trigger. Therefore, by asking the user, it can be determined whether to delete the microphone trigger command of the first voice message in the personal microphone status library to correct the personal microphone status library and reduce the situation of false triggers.

[0059] In an alternative embodiment, the method further includes:

[0060] After recognizing that there is a corresponding microphone trigger command for the user's first voice message, request a microphone trigger response result from the conference application;

[0061] After receiving the microphone trigger response success message and receiving the microphone status change information sent by the conference application within a preset first time period, after the vehicle-mounted Bluetooth is disconnected or a meeting termination reminder is received from the conference application, ask the user whether to cancel the microphone trigger operation for the first voice message;

[0062] In response to the feedback result of the user's response to the cancellation query, determine whether to correct the microphone status library.

[0063] Exemplarily, when the first voice message sent by the user triggers the microphone permission closing instruction and the conference application responds successfully, if it is a mis-trigger at this time, the user may directly manually turn on the microphone in the conference application on the mobile phone to start speaking, and at this time, the status of the conference microphone permission has changed. Then, after the conference ends, by asking the user, it is determined whether to delete the microphone trigger instruction of the first voice message in the personal microphone status library to correct the personal microphone status library and reduce the situation of mis-triggering.

[0064] In a second aspect of the embodiments of the present invention, a voice interaction device in a vehicle-mounted conference scenario is provided, which is used to execute all the steps and processes of the voice interaction method in the vehicle-mounted conference scenario provided in the above embodiments, including:

[0065] A voice collection module, configured to obtain the first voice message of the user collected by the vehicle-mounted microphone when entering the listening mode;

[0066] An identification module, configured to identify the first voice message, and determine whether there is a corresponding microphone trigger instruction in the pre-obtained microphone status library according to the identification result of the first voice message; wherein, the microphone trigger instruction includes enabling the conference microphone permission and disabling the conference microphone permission;

[0067] An instruction sending module, configured to send the microphone trigger instruction to the conference application of the conference terminal when there is a corresponding microphone trigger instruction, so as to control the conference application of the conference terminal to perform the operation of enabling or disabling the conference microphone permission.

[0068] It should be noted that the voice interaction device in the vehicle-mounted conference scenario provided in the embodiments of the present invention is used to execute all the steps and processes of the anti-motion sickness method in the above embodiments, and the working principles and beneficial effects of the two correspond one by one, and will not be elaborated here too much.

[0069] In addition, the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In a third aspect of the embodiments of the present invention, a vehicle is provided, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the voice interaction control method in the vehicle-mounted conference scenario provided in the above embodiments, for example Figure 1S11 to S13 of

[0071] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A voice interaction method in a vehicle-mounted conference scenario, characterized in that Including: When entering the listening mode, obtain the first voice information of the user collected by the in-vehicle microphone; Identify the first voice information, and determine whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the pre-obtained microphone status library according to the recognition result of the first voice information; wherein, the microphone trigger instruction includes an instruction to enable the conference microphone permission and an instruction to disable the conference microphone permission; When there is a corresponding microphone trigger instruction, send the microphone trigger instruction to the conference application of the conference terminal to control the conference application of the conference terminal to perform an operation of enabling or disabling the conference microphone permission; The method further includes: Monitor the third voice information sent by the conference terminal through the in-vehicle Bluetooth; Identify the third voice information, and determine whether there is a microphone trigger instruction corresponding to the recognition result of the third voice information from the pre-obtained microphone status library according to the recognition result of the third voice information; When there is a corresponding microphone trigger instruction, send the microphone trigger instruction to the conference application of the conference terminal to control the conference application of the conference terminal to perform an operation of enabling or disabling the conference microphone permission.

2. The voice interaction method in an in-vehicle conference scenario according to claim 1, wherein, After obtaining the first voice information of the user collected by the in-vehicle microphone, it further includes: Identify the user voiceprint of the first voice information, and match it with the pre-stored user voiceprint library to identify the first user who issued the first voice information; Then, the step of determining whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the pre-obtained microphone status library specifically includes: Obtain the personal microphone status library of the first user, and determine whether there is a microphone trigger instruction corresponding to the recognition result of the first voice information from the personal microphone status library according to the recognition result of the first voice information.

3. The voice interaction method in the in-vehicle conference scenario according to claim 1, wherein, The method further includes: When there is a corresponding microphone trigger instruction, control the in-vehicle microphone to remind the user that they are about to start speaking or be muted in a countdown manner.

4. The voice interaction method in the in-vehicle conference scenario according to claim 3, wherein, The method further includes: When it is recognized that there is a corresponding microphone trigger instruction for the first voice information of the user, and the second voice information of the user is received during the countdown playback period of the in-vehicle microphone, identify the second voice information; When it is detected that the recognition result of the second voice information is a microphone trigger instruction and its trigger type is different from the trigger type of the first voice information, respond to the microphone trigger instruction corresponding to the second voice information.

5. The voice interaction method in the in-vehicle conference scenario according to claim 4, wherein After responding to the microphone trigger instruction corresponding to the second voice information, it further includes: After the in-vehicle Bluetooth is disconnected or a conference termination reminder is received from the conference application, ask the user whether to cancel the microphone trigger operation for the first voice information; Respond to the feedback result of the user's response to the cancellation query, and determine whether to correct the microphone status library.

6. The voice interaction method in the in-vehicle conference scenario according to claim 1, wherein, The method further includes: After it is recognized that there is a corresponding microphone trigger instruction for the first voice information of the user, request a microphone trigger response result from the conference application; After receiving the microphone trigger response success information and receiving the microphone status switching information sent by the conference application within a preset first time period, when the vehicle-mounted Bluetooth is disconnected or a conference termination reminder is received from the conference application, ask the user whether to cancel the microphone trigger operation for the first voice message; In response to the feedback result of the user's response to the cancellation query, determine whether to correct the microphone status library.

7. A voice interaction device in a vehicle-mounted conference scenario, characterized in that, Includes: A voice acquisition module for obtaining the first voice message of the user collected by the vehicle-mounted microphone when entering the listening mode; An identification module for identifying the first voice message and determining whether there is a corresponding microphone trigger instruction in the pre-acquired microphone status library according to the identification result of the first voice message; wherein, the microphone trigger instruction includes an instruction to enable the conference microphone permission and an instruction to disable the conference microphone permission; An instruction sending module for, when there is a corresponding microphone trigger instruction, sending the microphone trigger instruction to the conference application of the conference terminal to control the conference application of the conference terminal to perform an operation of enabling the conference microphone permission or disabling the conference microphone permission; The device further includes: Listening to the third voice message sent by the conference terminal through the vehicle-mounted Bluetooth; Identifying the third voice message and determining whether there is a corresponding microphone trigger instruction in the pre-acquired microphone status library according to the identification result of the third voice message; When there is a corresponding microphone trigger instruction, sending the microphone trigger instruction to the conference application of the conference terminal to control the conference application of the conference terminal to perform an operation of enabling the conference microphone permission or disabling the conference microphone permission.

8. A vehicle, characterized in that, Includes a processor, a memory, and a computer program stored on the memory and capable of running on the processor. When the computer program is executed by the processor, it implements the voice interaction method in the vehicle-mounted conference scenario according to any one of claims 1-6.

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