Projection system and control method thereof

Abstract

The present application discloses a projection system and a control method thereof, belonging to the field of electronic technology. The projection system includes a cabinet, and a controller, a projection device, a speaker, and a microphone located in the cabinet; the cabinet has a lid, and the projection device is used to project images after the lid is opened; the controller is used to: after receiving a closing instruction for the lid, emit an ultrasonic signal through the speaker and receive the ultrasonic signal through the microphone to detect the distance between the cabinet and an obstacle outside it; when the distance is greater than or equal to a threshold, control the lid to close; during the lid closing process, if the distance is less than the threshold, control the lid to stop closing. The present application solves the problem of low flexibility in use of the projection system. The present application is used for projection.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a projection system and a control method thereof. Background Art

[0002] With the development of electronic technology, projection systems that display images in a projection manner have been widely used.

[0003] In related art, a projection system includes a cabinet, a projection device, and a screen located within the cabinet. The cabinet may have a removable upper cover. When the projection system is needed to present an image, the upper cover opens, the screen rises from the cabinet, and the projection device emits light toward the screen to form a projected image. When the projection system is no longer needed to present an image, the projection device stops emitting light, the screen is stored within the cabinet, and the upper cover closes.

[0004] However, the projection system in the related art has low flexibility in use. Summary of the Invention

[0005] This application provides a projection system and a control method thereof, which can solve the problem of low flexibility in the use of projection equipment. The technical solution includes:

[0006] In one aspect, a projection system is provided, comprising a cabinet, and a controller, a projection device, a speaker, and a microphone located in the cabinet; the cabinet having a cover, the projection device being configured to project an image when the cover is opened; and the controller being configured to:

[0007] After receiving a closing instruction for the cover, an ultrasonic signal is emitted through the speaker, and the ultrasonic signal is received through the microphone to detect the distance between the cabinet and an obstacle outside the cabinet;

[0008] When the distance is greater than or equal to a threshold, controlling the cover to close;

[0009] During the closing process of the cover, when the distance is less than the threshold, the cover is controlled to stop closing.

[0010] In another aspect, a control method for a projection system is provided, which is used for a controller in the projection system. The projection system further includes: a cabinet, and a projection device, a speaker, and a microphone located in the cabinet; the cabinet has a cover, and the projection device is configured to project an image when the cover is opened; the method includes:

[0011] After receiving a closing instruction for the cover, an ultrasonic signal is emitted through the speaker, and the ultrasonic signal is received by the microphone, so that the detection component detects the distance between the cabinet and an obstacle outside the cabinet;

[0012] When the distance is greater than a threshold, controlling the cover to close;

[0013] During the closing process of the cover, when the distance is less than the threshold, the cover is controlled to stop closing.

[0014] In another aspect, a controller for a projection system is provided. The projection system further includes: a cabinet, and a projection device, a speaker, and a microphone located in the cabinet; the cabinet has a lid, and the projection device is configured to project an image when the lid is opened. The controller includes:

[0015] a detection module, configured to, upon receiving a closing instruction for the cover, emit an ultrasonic signal through the speaker and receive the ultrasonic signal through the microphone, so as to detect the distance between the cabinet and an obstacle outside the cabinet;

[0016] a first control module, configured to control the cover to close when the distance is greater than or equal to a threshold;

[0017] The second control module is configured to control the cover to stop closing when the distance is less than the threshold value during the closing process of the cover.

[0018] On the other hand, a controller in a projection system is provided, the controller comprising a processing unit and a storage unit, the storage unit storing instructions, and the processing unit being configured to execute the instructions to implement the above control method.

[0019] On the other hand, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium. When the instructions are executed on a computer, the computer executes the above-mentioned control method.

[0020] On the other hand, a computer program product comprising instructions is provided. When the computer program product is run on a computer, the computer is caused to execute the above control method.

[0021] The beneficial effects of the technical solution provided by this application include at least:

[0022] In this application, upon receiving a cover closing instruction, the projection system controller can multiplex the speaker and microphone to transmit and receive ultrasonic signals to detect the distance between the cabinet and any obstacles outside. If the distance is less than a threshold value during the cover closing process, the cover is controlled to stop closing. This allows the cover to stop closing if a user approaches the cover during closing, thus avoiding safety hazards such as pinching the user's hand. This improves the flexibility and safety of the projection system while keeping the cost of the projection system low. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 1 is a schematic structural diagram of a projection system provided in an embodiment of the present application;

[0025] Figure 2 is a block diagram of a projection system provided in an embodiment of the present application;

[0026] Figure 3 It is a block diagram of a projection system provided by signal reception;

[0027] Figure 4 is a flow chart of a method for controlling a projection system provided by an embodiment of the present application;

[0028] Figure 5 is a flow chart of another method for controlling a projection system provided by an embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of a usage scenario of a projection system provided by an embodiment of the present application;

[0030] Figure 7 is a schematic structural diagram of a controller in a projection system provided in an embodiment of the present application;

[0031] Figure 8 is a schematic structural diagram of a controller in another projection system provided in an embodiment of the present application;

[0032] Figure 9 Schematic diagram of the structure of a controller in another projection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0034] With the development of electronic technology, the display effects of projection devices are getting better and better, and the display size and display position of the projection screen can be flexibly adjusted. Therefore, projection devices are increasingly used to replace televisions. Projection devices that use lasers as light sources to replace televisions can be called laser TVs.

[0035] Currently, there are all-in-one laser TVs, which integrate a TV cabinet, a projection device, and a screen. In an all-in-one laser TV, both the projection device and the screen can be stored in the TV cabinet, which has a sliding upper cover (such as simply referred to as a slide cover). When the all-in-one laser TV is turned on, the slide cover opens first, the projection device starts to emit light, and while the light is emitting, the screen rises from the TV cabinet. When the all-in-one laser TV is turned off, the screen descends, and after the screen has descended, the slide cover closes. During the closing process of the slide cover, if the user reaches out to the slide cover, he or she may be pinched by the slide cover.

[0036] In the related art, infrared pyroelectric modules, used for eye protection, can also provide anti-pinch protection. However, these modules are primarily designed to protect against eye damage from laser light emitted by projectors and cease functioning after the projector stops emitting light. Since the slider typically closes only after the projector stops emitting light, the infrared pyroelectric module cannot provide anti-pinch protection at this time, posing a safety hazard during the closing process.

[0037] The following embodiments of the present application provide a projection system and a control method thereof. The projection device may be the aforementioned integrated laser TV. The projection system includes a controller that controls other components of the projection system based on the control method. The projection system can be highly flexible, safe, and cost-effective.

[0038] Figure 1 Schematic diagram of a projection system provided in an embodiment of the present application. Figure 1 As shown, the projection system 10 includes a cabinet 101, a controller (not shown) located in the cabinet 101, a projection device (not shown), and a detection component 102. The controller can also be called the main chip of the projection system 10.

[0039] The cabinet 101 has a cover G. The projection device is used to emit light to form a projection image after the cover G is opened, so as to project the image. The cover G can be located on the upper side of the cabinet 101. Figure 1 Take the cover G as a sliding cover that opens and closes by sliding as an example. Optionally, the cover G can also be opened and closed by rotating, folding or other ways, which are not limited in the embodiment of the present application.

[0040] The detection component 102 is used to assist the controller in determining the distance between the obstacle in front of the cabinet 101 and the cabinet 101. Figure 1As shown, the detection component 102 includes a speaker 1021 and a microphone 1022. In addition to being used to emit an audio signal corresponding to the image projected by the projection device, the speaker 1021 can also be used to emit an ultrasonic signal (that is, it supports signal transmission in the ultrasonic frequency band), and the frequency of the audio signal is lower than the frequency of the ultrasonic signal. In addition to being used to receive voice signals, the microphone 1022 can also be used to receive an ultrasonic signal (that is, it supports signal reception in the ultrasonic frequency band), and the frequency of the voice signal is lower than the frequency of the ultrasonic signal. The microphone 1022 receives an ultrasonic signal that is emitted by the speaker 1021 and then reflected by an obstacle and then emitted back. In an embodiment of the present application, the detection component 102 can reuse the speaker 1021 and the microphone 1022, so that the cost of the projection system can be reduced. Optionally, the detection component 102 can also be an ultrasonic transceiver component independent of the speaker and the microphone.

[0041] The controller can determine the distance of the obstacle from the cabinet 102 based on the time difference between the reception and transmission of the ultrasonic signal. For example, the time difference between the reception and transmission can be the difference between the time when the microphone 1022 receives the ultrasonic signal and the time when the speaker 1021 emits the ultrasonic signal. Optionally, the time difference between the reception and transmission can also be the difference between the time when the electrical signal corresponding to the ultrasonic signal received by the microphone 1022 is transmitted to the controller and the time when the controller emits the ultrasonic signal for generating the ultrasonic signal emitted by the speaker 1021. The obstacle can be considered to be a user. The controller can control the cover G based on the distance, such as controlling the cover G during the closing process of the cover G to avoid the risk of safety hazards caused by the cover G continuing to close when the user approaches.

[0042] Optionally, the frequency of the ultrasonic signal in the embodiment of the present application is greater than or equal to 30 kHz, and the frequency response supported by the speaker 1021 and the microphone 1022 is greater than or equal to 30 kHz. This ensures that even if the user has sensitive hearing, the ultrasonic signal will not cause noise interference to the user, thereby improving the user experience of the projection system.

[0043] The position of the detection component 102 can be related to the position of the cover G. For example, the cover G is located in the middle area of ​​the upper side of the frame 101, and the speaker 1021 and the microphone 1022 are also correspondingly located in the middle area of ​​the cabinet 101. The distance detected in this way can more accurately reflect the distance between the user and the cover G, ensuring that controlling the cover G based on this distance can achieve the effect of better eliminating safety hazards. The cabinet 101 can have openings corresponding to the speaker 1021 and the microphone 1022, so that the speaker 1021 and the microphone 1022 are exposed through the corresponding openings to ensure the signal receiving and transmitting effect of the speaker 1021 and the microphone 1022.

[0044] Optionally, the speaker 1021 in the embodiment of the present application may be a center speaker, and the audio signal emitted may include background sound, human voice dialogue, and some sounds related to actions transmitted through the center channel. Figure 1 As shown, the projection system 10 may further include other speakers besides the speaker 1021 , for example, the other speakers may include a left speaker Y1 and a right speaker Y2 located on the left and right sides of the cabinet 101 , respectively.

[0045] like Figure 1 As shown, the projection system 10 further includes a screen 103 , which can be switched between a state of being retracted in the cabinet 101 (eg, simply referred to as the retracted state) and a state of being extended outside the cabinet 101 (eg, simply referred to as the extended state). Figure 1 The screen 103 is shown in its expanded state. When the screen 103 is in the expanded state, the projection device can emit light toward the screen 103 to form a projection image on the screen 103. The screen 103 gradually rises from the cabinet 101 during the process of switching from the retracted state to the expanded state; and gradually descends during the process of switching from the expanded state to the retracted state. For example, the screen 103 may include a curtain 1031 and a support member 1032 located on the back of the curtain 1031. The curtain 1031 is fixed to the support member 1032, and the support member 1032 can be extended and retracted. The curtain 1031 is retracted and extended by the extension and retraction of the support member 1032.

[0046] The projection system 10 may also include a remote control (not shown). The user can control the projection system 10 via the remote control. For example, the remote control can be used to power the projection system on and off, control the projection device to start or stop emitting light, control the screen to retract or expand, and control the cover G to open or close. For example, when the remote control is used to power the projection system on, the cover G may automatically open, followed by the projection device emitting light and the screen automatically expanding. When the remote control is used to power the projection system off, the screen automatically retracts, the projection device automatically stops emitting light, and then the cover G automatically closes.

[0047] The projection system 10 may further include a display panel, a power supply panel, a main board and other circuits, which will not be described in detail in the embodiment of the present application.

[0048] Figure 2 This is a block diagram of a projection system provided in an embodiment of the present application. Figure 2 The connection relationship between some structures in the projection system and the signal transmission process are shown below. Figure 2 The functional implementation of each component in the projection system 10 is introduced.

[0049] like Figure 2As shown, the projection system 10 also includes a motor drive module and a motor. The motor drive module is electrically connected to the controller and the motor, which is mechanically connected to the cover G. When the controller needs to control the movement of the cover G, it can send a control signal to the motor drive module. Based on the control signal, the motor drive module can output a drive signal to the motor, which then drives the cover G based on the drive signal. The control signal can include pulse signals, enable signals, and direction signals.

[0050] like Figure 2 As shown, the projection system 10 may further include a first switch, a second switch, an ultrasonic power amplifier component, and an audio power amplifier component. The first switch, the second switch, the ultrasonic power amplifier component, the audio power amplifier component, and the speaker may collectively constitute an audio transmission module. The first switch and the second switch are both connected to the controller, the ultrasonic power amplifier component and the audio power amplifier component are both connected to the first switch and the second switch, and the speaker is connected to the second switch.

[0051] The first switch is used to switch the connection state between the controller and the audio power amplifier component and the ultrasonic power amplifier component, and the second switch is used to switch the connection state between the speaker and the audio power amplifier component and the ultrasonic power amplifier component. Therefore, by controlling the first switch and the second switch, the connection state between the speaker and the controller can be switched between a first state and a second state. The first state is the state in which the controller is connected via the audio power amplifier component, and the second state is the state in which the controller is connected via the ultrasonic power amplifier component. In the first state, the audio power amplifier component is powered, the ultrasonic power amplifier component is powered off, and the speaker can emit the audio signal required by the projection device. In the second state, the ultrasonic power amplifier component is powered, the audio power amplifier component can be powered off, and the speaker can emit ultrasonic signals.

[0052] The controller can connect the first switch using the integrated circuit built-in audio (Inter-IC Sound, I2S) interface and the general purpose input / output (General Purpose Input / Output, GPIO) port, and connect the second switch through the GPIO port. The controller can use different GPIO ports to control the working state of the first switch and the second switch, and use the I2S interface to transmit the audio signal, which is a signal in the I2S format. Optionally, the first switch and the second switch can both be single-pole double-throw switches. In the embodiment of the present application, the signal transmitted between the controller and the first switch can be a digital signal, so the first switch can be a digital switch. The signal transmitted between the second switch and the speaker can be an analog signal, so the second switch can be an analog switch.

[0053] In the first state, the controller can decode the source audio signal and convert the decoded source audio signal into an I2S format signal. The I2S format signal is then transmitted to the subsequent audio amplifier component via the first switch. The audio amplifier component is used to amplify the received electrical signal. At this time, the signal is still an electrical signal. The speaker is used to convert the amplified electrical signal into an acoustic signal, which is then emitted as an audio signal.

[0054] In the second state, the controller can generate a square wave signal, such as one having a frequency greater than or equal to 30 kHz. This square wave signal is transmitted to the subsequent ultrasonic power amplifier component via the I2S interface. The ultrasonic power amplifier component is used to convert the square wave signal into a sine wave signal and amplify it. At this time, the signal is still an electrical signal. The speaker is used to convert the amplified electrical signal into an ultrasonic signal and emit it. Optionally, the ultrasonic power amplifier component may include a three-stage phase shift (Resistance-Capacitance Circuits, RC) network.

[0055] Optionally, the projection system 10 may further include a low-noise amplifier component and a third switch. The low-noise amplifier component, the third switch, and the microphone may together constitute a sound pickup module. The low-noise amplifier and the third switch are both connected to the controller, and the third switch is also connected to the low-noise amplifier and the microphone. The controller may control the third switch to switch the connection state between the microphone and the controller between a third state and a fourth state. The third state is a state in which the microphone is directly connected to the controller via the third switch, and the fourth state is a state in which the microphone is connected to the controller via the low-noise amplifier component. In the third state, the low-noise amplifier component may be powered off, and the microphone may collect voice signals. In the fourth state, the low-noise amplifier component is powered on, and the microphone may receive ultrasonic signals.

[0056] The controller can connect to a third switch via an audio-in (AIN) port and a GPIO port, and can connect to a low-noise amplifier via the AIN port. The controller can control the operating state of the third switch via the GPIO port and receive audio signals via the AIN port. Optionally, the third switch can be a single-pole double-throw switch. In embodiments of the present application, the signal transmitted between the controller and the third switch can be an analog signal, so the third switch can be an analog switch.

[0057] In the third state, the microphone can receive audio signals (such as voice signals) and convert the received voice signals into electrical signals for transmission to the controller. The controller can quantize and decode the received electrical signals, perform voice recognition using Automatic Speech Recognition (ASR) and Natural Language Processing (NLP) algorithms, and then control other components accordingly based on the voice recognition results. The voice signals can be user-generated control speech for the projection system.

[0058] In the fourth state, the microphone can receive ultrasonic signals, convert the received ultrasonic signals into electrical signals and transmit them to the low-noise amplifier. The low-noise amplifier amplifies the electrical signal and transmits it to the controller. Since the speaker and microphone are reused as the transceiver components of the ultrasonic signal in this application, and the speaker and microphone will have a certain attenuation for the ultrasonic signal, the use of the low-noise amplifier can ensure that the controller receives a clearer electrical signal for subsequent processing. Based on the received electrical signal, the controller can determine the distance between the speaker and microphone and the obstacle in front of them, that is, the distance between the cabinet and the obstacle.

[0059] For example, when the controller outputs a square wave signal, it timestamps each frame. When the controller receives an electrical signal from the low-noise amplifier, it determines the time difference Δt between the reception and transmission times of the electrical signal and the signal with the same timestamp in the square wave signal. The distance d between the cabinet and the obstacle is then calculated based on this time difference: d = v*Δt / 2, where v = 340 meters per second (m / s).

[0060] In an embodiment of the present application, when the projection system is turned on (such as receiving a power-on command sent by a remote control), it is necessary to keep the first switch, the second switch, the audio power amplifier component and the speaker powered, and keep the ultrasonic power amplifier component powered off. The controller uses the GPIO port to control the first switch and the second switch to the side of the audio power amplifier component, so that the transmission channel of the ordinary audio signal remains unobstructed, ensuring that the speaker plays audio signals such as background sound and human voice dialogue. When the projection system is turned on, it is also necessary to keep the third switch and the microphone powered, and keep the low-noise amplifier powered off. The controller uses the GPIO port to control the third switch to the AIN port, so that the voice receiving channel remains unobstructed, so as to ensure the voice control function of the projection system after powering on.

[0061] When the projection system is shut down (such as receiving a shutdown command sent by the remote control), the power supply to the first switch, the second switch, the ultrasonic power amplifier component and the speaker must be guaranteed, and the audio power amplifier component must be kept powered off. The controller uses the GPIO port to control the first switch and the second switch to the side of the ultrasonic power amplifier component, so that the transmission channel of the ultrasonic signal remains unobstructed to ensure that the ultrasonic signal can be transmitted. When the projection system is shut down, the power supply to the third switch, the low-noise amplifier and the microphone must also be maintained. The controller uses the GPIO port to control the third switch to periodically alternately switch to the AIN port and the low-noise amplifier, so that the voice receiving channel and the ultrasonic signal receiving channel remain alternately unobstructed, to ensure that the voice control function of the projection system is normal and can receive ultrasonic signals.

[0062] Optionally, when the projection system is shut down and the screen is not fully retracted into the cabinet, the controller can ensure that the ultrasonic signal transmission channel remains unobstructed, but does not control the speaker to transmit ultrasonic signals, thereby ensuring low power consumption of the projection system. Only when the screen is fully retracted, the projection device has stopped emitting light, and the cover needs to be closed, does the controller control the speaker to transmit ultrasonic signals.

[0063] Figure 3 This is a block diagram of a projection system provided by the related art. Figure 2 and Figure 3 It can be seen that the projection system provided in the embodiment of the present application is compared with the projection system in the related art, and further includes a first switch, a second switch, an ultrasonic power amplifier component, a third switch and a low-noise amplifier.

[0064] Figure 4 This is a flow chart of a control method of a projection system provided by an embodiment of the present application. The projection system can be Figure 1 and Figure 2 The projection system 10 shown in FIG. 1 may be used in a controller in the projection system 10 to control the slide G in the projection system 10. Figure 4 As shown, the method may include:

[0065] Step 401: After receiving a closing instruction for the lid, an ultrasonic signal is sent through a speaker and received through a microphone to detect the distance between the cabinet and an obstacle outside the cabinet.

[0066] For example, the shutdown command may be a shutdown command for the projection system, such as a shutdown command issued by a user via a remote control or a shutdown command issued by voice. Alternatively, the controller may determine receipt of the shutdown command for the cover after the projection device in the projection system shuts down and stops emitting light. The obstacle may be considered to be a user, and the distance may be used to reflect the distance between the user and the cabinet.

[0067] Step 402: When the distance is greater than or equal to a threshold, control the cover to close.

[0068] The threshold value may be a set value, such as 50 cm, or 40 cm, or another value, which is not limited in the present embodiment. If the distance between the obstacle and the cabinet is greater than or equal to the threshold value, it is considered that the user is far away from the cabinet, and closing the cover will not pose a danger to the user. If the distance between the obstacle and the cabinet is less than or equal to the threshold value, it is considered that the user is close to the cabinet, and closing the cover may pose a safety hazard to the user's hand.

[0069] Step 403: During the closing process of the cover, when the distance is less than the threshold, control the cover to stop closing.

[0070] In this embodiment of the present application, the controller can control the cover according to the distance between the detected obstacle outside the cabinet and the cabinet. When it is determined that the distance between the user and the cabinet is close, the controller controls the cover to stop closing, thereby avoiding the risk of pinching the user's hand and improving the flexibility and safety of the projection system.

[0071] In summary, in the control method for the projection system provided by this application, upon receiving a lid closing instruction, the controller can multiplex the speaker and microphone to transmit and receive ultrasonic signals to detect the distance between the cabinet and any obstacles outside it. If the distance is less than a threshold during the lid closing process, the lid is controlled to stop closing. In this way, if a user approaches the lid during the closing process, the lid can be controlled to stop closing, thereby avoiding safety hazards such as pinching the user's hand when the lid closes. This improves the flexibility and safety of the projection system while ensuring the low cost of the projection system.

[0072] Figure 5 This is a flow chart of another method for controlling a projection system provided by an embodiment of the present application. The projection system can be Figure 1 and Figure 2 The projection system 10 shown in FIG. 1 may be used in a controller in the projection system 10 to control other components in the projection system 10 (such as the speaker 1021, the microphone 1022, the slide cover G, and the screen 103). Figure 5 As shown, the method may include:

[0073] Step 501: Receive a power-on instruction for the projection system.

[0074] For example, when a user wants to watch a video on a projection system, they can trigger a power-on command for the projection system. For example, the user can use a remote control to send the power-on command, and the projection system controller can receive the power-on command accordingly. If the remote control can use infrared signals to send commands, the projection system can further include an infrared receiving module corresponding to the remote control, and the controller can use the infrared receiving module to receive the command sent by the remote control.

[0075] Step 502: Based on the power-on instruction, the cover is controlled to open, the speaker is controlled to emit an audio signal, and the microphone is controlled to receive a voice signal.

[0076] After receiving the power-on command for the projection system, the controller of the projection system can control the various components in the projection system to start working based on the power-on command, so that the projection system is in the power-on state (that is, the working state). For example, the controller can control the speaker and the microphone to start working, and make the connection state between the speaker and the controller the first state, and the connection state between the microphone and the controller the third state, so as to achieve normal audio playback and voice control. The controller can connect the speaker to the controller through the audio power amplifier component by controlling the first switch and the second switch, such as the speaker is connected to the I2S port of the controller through the audio power amplifier component. The controller can directly connect the microphone to the controller by controlling the third switch, such as the microphone is directly connected to the AIN port of the controller.

[0077] The controller can also control the lid to open, the projector to start emitting light, and the screen to rise to switch to the unfolded state based on the power-on command. Optionally, the user can also actively speak voice commands to control the lid to open, the projector to emit light, and the screen to rise, so that the controller controls the lid, the projector, and the screen based on the voice commands received by the microphone.

[0078] Optionally, when the projection system is powered on, the user can control the volume of the speaker, switch the arc surface of the projection device, and change the projection parameters of the projection device by speaking. The user can also control the shutdown of the projection system by speaking.

[0079] Step 503: Receive a closing instruction for the cover.

[0080] After receiving the shutdown instruction for the projection system, the controller may receive a closing instruction for the cover, and then control the cover to close based on the closing instruction.

[0081] For example, the controller may determine the shutdown instruction as a cover-closing instruction. For another example, based on the shutdown instruction, the controller may sequentially control the screen to retract, the projection device to stop emitting light, and the cover to close. The controller may determine that the cover-closing instruction has been received after determining that the projection device has stopped emitting light. For another example, the controller may receive a cover-closing instruction issued by a user via a remote control or voice.

[0082] In the embodiment of the present application, before receiving a shutdown command for the projection system, the projection system is in an on state. After receiving the shutdown command for the projection system, the controller needs to control various components in the projection system to stop operating based on the shutdown command to shut down the projection system, that is, switch the projection system from the on state to the off state.

[0083] Optionally, during the retraction of the screen in the projection system, the user can control the retraction of the screen by voice. The controller can receive a voice signal from the user via a microphone and perform voice recognition on the voice signal. If the voice signal is recognized to include control information for the screen, the controller controls the retraction and expansion of the screen based on the control information.

[0084] For example, while the controller is controlling the screen to retract, the user can say "stop," "stop retracting," or "stop descending" to trigger the controller to stop retracting the screen. The user can also say "continue descending" to trigger the controller to continue retracting the screen. While the controller is controlling the screen to expand, the user can say "stop," "stop expanding," or "stop ascending" to trigger the controller to stop expanding the screen. The user can also say "continue expanding" to trigger the controller to continue expanding the screen. In this way, the user can control the screen expansion and contraction process by voice, ensuring flexibility and safety of screen expansion and contraction.

[0085] Step 504: Control the speaker to emit an ultrasonic signal.

[0086] In the embodiment of the present application, a multiplexed speaker is used as an ultrasonic signal transmitting component, and the speaker supports emitting ultrasonic signals. If the frequency response supported by the speaker is greater than or equal to 30 kHz, the frequency of the ultrasonic signal is correspondingly greater than or equal to 30 kHz.

[0087] The controller can control the first and second switches to switch the speaker's connection to the controller from being connected via the audio amplifier to being connected via the ultrasonic amplifier. This switching changes the connection between the speaker and the controller from the first state to the second state. In the second state, the controller can send a first electrical signal to the ultrasonic amplifier, such as a square wave signal with a frequency of 30 kHz. The ultrasonic amplifier can convert the received first electrical signal into a sine wave signal and amplify it. The speaker can then convert the amplified electrical signal into an ultrasonic signal and emit it.

[0088] In an embodiment of the present application, the controller can switch the connection state between the speaker and the controller from a first state to a second state after receiving a shutdown command for the projection system. In the second state, the controller can only send a first electrical signal to control the speaker to emit an ultrasonic signal after receiving a closing command for the cover to ensure low power consumption of the projection system; or the controller can directly control the speaker to emit an ultrasonic signal after switching to the second state. Optionally, the controller can also switch the connection state between the speaker and the controller from the first state to the second state and control the speaker to emit an ultrasonic signal after receiving a closing command for the cover.

[0089] Step 505: Control the microphone to receive ultrasonic signals.

[0090] In the embodiments of the present application, a microphone is used as a receiving component for ultrasonic signals, and the microphone supports receiving ultrasonic signals. If the microphone supports a frequency response greater than or equal to 30 kHz, it can correspondingly receive ultrasonic signals with a frequency greater than or equal to 30 kHz.

[0091] The controller can switch the microphone from being directly connected to the controller to being connected to the controller through a low-noise amplifier by controlling the third switch, that is, switching the connection state between the microphone and the controller from the third state to the fourth state. When working, the microphone can continuously receive sound signals and convert the sound signals into electrical signals. In the third state, the microphone can convert the received voice signal into an electrical signal and transmit it to the controller. In the fourth state, the microphone can convert the received ultrasonic signal into a second electrical signal and input it into the low-noise amplifier. The low-noise amplifier can amplify the received second electrical signal and transmit it to the controller.

[0092] In the embodiment of the present application, the controller may switch the connection state between the microphone and the controller from the third state to the fourth state after receiving a shutdown command for the projection system. Alternatively, the controller may switch the connection state between the microphone and the controller from the third state to the fourth state after receiving a closing command for the cover.

[0093] Step 506: Determine the distance between the cabinet and any obstacles outside the cabinet based on the time difference between sending and receiving the ultrasonic signal.

[0094] Figure 6 This is a schematic diagram of a use scenario of a projection system provided by an embodiment of the present application. Figure 6 As shown, the ultrasonic signal emitted by the speaker can be reflected by obstacles outside the cabinet (such as the human body) and received by the microphone. Since the distance from the speaker to the obstacle is basically the same as the distance from the obstacle to the microphone, the controller can determine the distance between the cabinet and the obstacle based on the time difference between the transmission and reception of the same ultrasonic signal and the transmission speed of the sound wave signal. For example, the distance d = v*Δt / 2, where Δt represents the time difference between the transmission and reception of the ultrasonic signal, and v represents the transmission speed of the sound wave signal, which is equal to 340 meters per second.

[0095] In the embodiment of the present application, the distance determined by the controller is actually the distance between the obstacle and the speaker or microphone. Since the speaker and microphone can be on the outer surface of the cabinet, the distance can be considered as the distance between the cabinet and the obstacle.

[0096] The transmit-receive time difference can be the difference between the time when the microphone receives the ultrasonic signal and the time when the speaker sends the ultrasonic signal. The transmit-receive time difference can also be the difference between the time when the electrical signal corresponding to the ultrasonic signal received by the microphone is transmitted to the controller and the time when the controller sends the ultrasonic signal for generating the ultrasonic signal sent by the speaker. For example, when the controller outputs the first electrical signal, it will timestamp each frame of the signal. After receiving the amplified second electrical signal from the low-noise amplifier, the time difference between the reception time and the sending time of the amplified second electrical signal and the signal with the same timestamp in the first electrical signal is determined as the transmit-receive time difference.

[0097] In an embodiment of the present application, the speaker can continuously send ultrasonic signals and the microphone can continuously receive ultrasonic signals. Accordingly, the controller can determine the distance between the cabinet and an obstacle outside it to monitor the movement of the obstacle relative to the cabinet.

[0098] Step 507: Determine whether the distance is greater than or equal to a threshold. If the distance is greater than or equal to the threshold, execute step 507; if the distance is less than the threshold, execute step 506.

[0099] The threshold value may be a fixed value, such as 50 cm, 60 cm, or another value. In the embodiment of the present application, the controller may determine the distance between the cabinet and the obstacle and the threshold value to determine the distance between the cabinet and the obstacle, thereby controlling the cover differently based on the distance.

[0100] When the distance between the cabinet and the obstacle is greater than or equal to the set threshold, the obstacle is considered far away, and closing the lid does not pose a safety hazard. When the distance between the cabinet and the obstacle is less than the set threshold, the obstacle is considered close. If the obstacle is a user, there is a high probability that the user will suddenly move in front of the cabinet, and closing the lid could pose a risk of pinching the user's hand. Therefore, the lid can be controlled to close without continuous distance detection to monitor the distance between the user and the cabinet.

[0101] Step 508: Control the cover to close.

[0102] For example, when the distance between the cabinet and the obstacle is greater than or equal to a set threshold, the obstacle can be considered far away from the cabinet and closing the lid will not pose a safety hazard, so the lid can be controlled to close. Optionally, the lid can move at a set speed during closing. The controller can control the lid to close using a motor drive circuit and a motor.

[0103] Step 509: During the closing process of the cover, determine whether the distance is less than the threshold. If the distance is less than the threshold, execute step 510; if the distance is greater than or equal to the threshold, execute step 508.

[0104] During the closing process of the lid, the controller must continue to monitor the movement of the obstacle to determine whether there is a safety hazard. For example, the controller still determines whether there is a safety hazard based on the relationship between the distance and the aforementioned threshold. If there is a safety hazard, step 510 is executed to control the lid to stop closing. If there is no safety hazard, step 508 is continued to cause the lid to continue moving.

[0105] Step 510: Control the cover to stop closing. Execute step 506.

[0106] After controlling the lid to stop closing, the controller can continue executing steps 506 and 507 to continue detecting whether the safety hazard has disappeared. If the safety hazard has disappeared, the controller can continue controlling the lid to close. If the safety hazard has not disappeared, the controller can continue to control the lid to close. Optionally, if the controller determines that the distance between the obstacle and the cabinet is less than the threshold, the controller can also display a warning message to remind the user to be careful of the hand being pinched. For example, this warning message can be a voice message emitted by another speaker or a light signal displayed by an indicator light.

[0107] In the embodiment of the present application, a single threshold is set for the distance, and there are only two relationships between the distance and the threshold. Two different controls are respectively applied to the cover based on the two relationships. Alternatively, multiple thresholds of varying sizes can be set for the distance, and the controller performs different controls when the relationship between the distance and each threshold is different. For example, a first threshold and a second threshold can be set, with the first threshold being greater than the second threshold. When the distance is greater than the first threshold, the cover is controlled to close at a faster first speed; when the distance is between the first and second thresholds, the cover is controlled to close at a slower second speed; and when the distance is less than the second threshold, the cover is controlled to stop closing.

[0108] In this embodiment of the present application, after receiving a closing instruction for the lid, the controller can maintain the connection between the microphone and the controller in the fourth state. Optionally, the controller can also control a third switch to periodically connect the microphone to the controller via the low-noise amplifier; that is, the connection between the microphone and the controller can periodically switch between the third and fourth states. For example, this period can be 10 milliseconds, 15 milliseconds, or another time period.

[0109] In the periodic switching mode, when the microphone is connected to the controller and not connected to the low-noise amplifier (i.e., the third state), the controller can receive a voice signal through the microphone. This voice signal can be a control signal for the projection system spoken by the user. The controller can perform natural language processing and speech recognition on the voice signal received by the microphone to determine whether the voice signal contains control information for the projection system. If the voice signal contains control information for the lid, the controller can control the opening and closing of the lid based on this control information.

[0110] For example, while the controller is closing the lid, the user can say something like "stop" or "stop closing the lid" to trigger the controller to stop closing the lid. Alternatively, the user can say something like "continue closing" to trigger the controller to continue closing the lid. This way, if the function that determines the distance to control the lid based on ultrasonic signals (such as the so-called active protection function) fails, the user can still use voice control to ensure safety during the lid closing process.

[0111] In an embodiment of the present application, after the cover is closed, the controller can control all components in the projection system (such as switches, speakers, microphones, ultrasonic power amplifier components, low-noise amplifiers, motor drive components and motors, etc.) to power off to shut down the projection system.

[0112] In the embodiment of the present application, while the lid is being moved from an open state to a closed state, the controller can continuously detect whether there is a safety hazard. If a safety hazard exists, the controller stops the lid from closing, and only activates the lid when there is no safety hazard. This reduces the risk of closing the lid, increases the flexibility of the projection system, and enhances the user experience.

[0113] In summary, in the control method for the projection system provided by this application, upon receiving a lid closing instruction, the controller can multiplex the speaker and microphone to transmit and receive ultrasonic signals to detect the distance between the cabinet and any obstacles outside it. If the distance is less than a threshold during the lid closing process, the lid is controlled to stop closing. In this way, if a user approaches the lid during the closing process, the lid can be controlled to stop closing, thereby avoiding safety hazards such as pinching the user's hand when the lid closes. This improves the flexibility and safety of the projection system while ensuring the low cost of the projection system.

[0114] Figure 7 This is a schematic diagram of the structure of a controller in a projection system provided by an embodiment of the present application. The controller here can be Figure 2 The projection system further includes: a cabinet, and a projection device, a speaker, and a microphone located in the cabinet; the cabinet has a cover, and the projection device is used to project images after the cover is opened. Figure 7 As shown, the controller 70 includes:

[0115] The detection module 701 is used to send an ultrasonic signal through a speaker and receive the ultrasonic signal through a microphone after receiving a closing instruction for the cover, so as to detect the distance between the cabinet and obstacles outside the cabinet.

[0116] The first control module 702 is configured to control the cover to close when the distance is greater than or equal to a threshold.

[0117] The second control module 703 is configured to control the cover to stop closing when the distance is less than the threshold value during the closing process of the cover.

[0118] In summary, the controller of the projection system provided by the present application, upon receiving a lid closing instruction, can multiplex the speakers and microphone to transmit and receive ultrasonic signals to detect the distance between the cabinet and any obstacles outside it. If the distance falls below a threshold during the lid closing process, the lid is controlled to stop closing. In this way, if a user approaches the lid during the closing process, the lid can be controlled to stop closing, thereby avoiding safety hazards such as pinching the user's hand when the lid closes. This improves the flexibility and safety of the projection system while ensuring a low cost.

[0119] Optionally, the controller 70 further includes:

[0120] A receiving module, configured to receive a power-on instruction for the projection system before receiving a power-off instruction;

[0121] The fifth control module is used to control the cover to open based on the power-on instruction, control the speaker to emit an audio signal, and control the microphone to receive a voice signal.

[0122] Optionally, the projection system further includes: a first switch, a second switch, an ultrasonic power amplifier component, and an audio power amplifier component; the first switch and the second switch are both connected to the controller, the ultrasonic power amplifier component and the audio power amplifier component are both connected to the first switch and the second switch, and the speaker is connected to the second switch; the detection module 701 is used to:

[0123] Based on the power-on instruction, the speaker is connected to the controller via the audio amplifier component by controlling the first switch and the second switch;

[0124] Based on the off instruction, the speaker is switched to be connected to the controller via the ultrasonic power amplifier component by controlling the first switch and the second switch;

[0125] The first electrical signal is sent to the ultrasonic power amplifier component to control the speaker to emit an ultrasonic signal.

[0126] Optionally, the detection module 701 is configured to determine a time difference between sending and receiving the ultrasonic signal based on the first electrical signal to determine the distance.

[0127] Optionally, the projection system further includes: a low-noise amplifier and a third switch connected to the controller, wherein the third switch is further connected to the low-noise amplifier and the microphone; and the detection module 701 is configured to:

[0128] Based on the power-on instruction, the microphone is connected to the controller by controlling the third switch;

[0129] Based on the off instruction, the microphone is connected to the controller through the low-noise amplifier by controlling the third switch; the microphone is used to convert the received ultrasonic signal into a second electrical signal and input it into the low-noise amplifier, and the low-noise amplifier is used to amplify the received second electrical signal;

[0130] The distance is determined based on the second electrical signal amplified by the low noise amplifier.

[0131] Optionally, the detection module 701 is configured to: control the third switch so that the microphone is periodically connected to the controller via the low noise amplifier; and receive a voice signal via the microphone when the microphone is connected to the controller but not connected to the low noise amplifier.

[0132] Figure 8 FIG. 1 is a schematic diagram of the structure of another controller in a projection system provided by an embodiment of the present application. Figure 8As shown, the controller 70 further includes a third control module 704 for controlling the opening and closing of the cover based on the control information when there is control information on the cover in the voice signal.

[0133] Optionally, the first switch is a digital switch, and the second switch is an analog switch.

[0134] Optionally, the frequency of the ultrasonic signal is greater than or equal to 30 kHz, and / or the speaker and the microphone are both located in a middle area of ​​the cabinet.

[0135] Optionally, the projection system further includes a screen, and the screen can be switched between a state of being retracted in the cabinet and a state of being extended outside the cabinet. Figure 9 FIG. 1 is a schematic diagram of the structure of a controller in another projection system provided in an embodiment of the present application. Figure 9 As shown, the controller 70 further includes a fourth control module 705 for controlling the contraction and expansion of the screen based on the control information when the received voice signal includes control information for the screen.

[0136] In summary, the controller of the projection system provided by the present application, upon receiving a lid closing instruction, can multiplex the speakers and microphone to transmit and receive ultrasonic signals to detect the distance between the cabinet and any obstacles outside it. If the distance falls below a threshold during the lid closing process, the lid is controlled to stop closing. In this way, if a user approaches the lid during the closing process, the lid can be controlled to stop closing, thereby avoiding safety hazards such as pinching the user's hand when the lid closes. This improves the flexibility and safety of the projection system while ensuring a low cost.

[0137] The embodiment of the present application further provides a controller in a projection system, the controller comprising a processing unit and a storage unit, the storage unit storing instructions, and the processing unit being configured to execute the instructions stored in the storage unit to implement the above control method, such as Figure 4 or Figure 5 method.

[0138] The embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, which, when executed on a computer, enable the computer to execute the above-mentioned control method, such as Figure 4 or Figure 5 The computer-readable storage medium may be any available medium that can be accessed by a computer, such as a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium, or a semiconductor medium (e.g., a solid-state drive).

[0139] The present application also provides a computer program product including instructions. When the computer program product is run on a computer, the computer executes the above control method, such as Figure 4 or Figure 5 method.

[0140] It should be noted that the method embodiments provided in the embodiments of the present application can be referenced with the corresponding device embodiments, and the embodiments of the present application are not limited thereto. The order of the steps of the method embodiments provided in the embodiments of the present application can be appropriately adjusted, and the steps can be increased or decreased accordingly according to the circumstances. Any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application, and therefore will not be described in detail.

[0141] It should be noted that in the embodiments of the present application, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "at least one" refers to one or more. The term "plurality" refers to two or more, unless otherwise clearly defined. The term "at least one of A and B" in this application is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, at least one of A and B may represent: A exists alone, A and B exist at the same time, and B exists alone. The terms "including" and "having" and any variations thereof in this application are intended to cover but not exclude inclusion. For example, a product or device that includes a series of components is not necessarily limited to those components clearly listed, but may include other components that are not clearly listed or inherent to these products or devices. The term "module" used in this application refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic or combination of hardware and / or software code that can perform the functions associated with the element.

[0142] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A projection system, characterized in that: The system comprises a cabinet, a controller, a projection device, a speaker and a microphone located in the cabinet; the cabinet has a cover, and the projection device is used to project images after the cover is opened; the controller is used to: receiving a power-on instruction for the projection system; Based on the power-on instruction, controlling the cover to open, controlling the speaker to emit an audio signal, and controlling the microphone to receive a voice signal; After receiving a closing instruction for the cover, an ultrasonic signal is emitted through the speaker, and the ultrasonic signal is received through the microphone to detect the distance between the cabinet and an obstacle outside the cabinet; When the distance is greater than a first threshold, the cover is controlled to close at a first speed; when the distance is between the first threshold and a second threshold, the cover is controlled to close at a second speed, the first threshold is greater than the second threshold, and the first speed is greater than the second speed; During the closing process of the cover, when the distance is less than the second threshold, controlling the cover to stop closing; The projection system further includes: a first switch, a second switch, an ultrasonic power amplifier component, and an audio power amplifier component; the first switch and the second switch are both connected to the controller, the ultrasonic power amplifier component and the audio power amplifier component are both connected to the first switch and the second switch, and the speaker is connected to the second switch; the controller is further configured to: Based on the power-on instruction, the speaker is connected to the controller via the audio amplifier component by controlling the first switch and the second switch; Based on the shutdown instruction, the speaker is switched to be connected to the controller through the ultrasonic power amplifier component by controlling the first switch and the second switch; By sending a first electrical signal to the ultrasonic power amplifier component, the speaker is controlled to emit the ultrasonic signal; The projection system further includes: a low-noise amplifier and a third switch connected to the controller, wherein the third switch is further connected to the low-noise amplifier and the microphone; and the controller is further configured to: Based on the power-on instruction, the microphone is connected to the controller by controlling the third switch; Based on the shutdown instruction, the microphone is connected to the controller through the low-noise amplifier by controlling the third switch; the microphone is used to convert the received ultrasonic signal into a second electrical signal and input it into the low-noise amplifier, and the low-noise amplifier is used to amplify the received second electrical signal; determining the distance based on the second electrical signal amplified by the low-noise amplifier; Wherein, the controller is further used for: By controlling the third switch, the microphone is periodically connected to the controller via the low noise amplifier; When the microphone is connected to the controller and not connected to the low-noise amplifier, receiving a voice signal through the microphone; When control information for the cover is present in the voice signal, opening and closing of the cover are controlled based on the control information.

2. The projection system according to claim 1, wherein: The controller is configured to determine a time difference between sending and receiving the ultrasonic signal based on the first electrical signal to determine the distance.

3. The projection system according to claim 1, wherein: The first switch is a digital switch, and the second switch is an analog switch.

4. The projection system according to any one of claims 1 to 3, characterized in that: The frequency of the ultrasonic signal is greater than or equal to 30 kHz, And / or, the speaker and the microphone are both located in the middle area of ​​the cabinet.

5. The projection system according to any one of claims 1 to 3, characterized in that: The projection system further includes a screen, which can be switched between a state of being retracted in the cabinet and a state of being extended outside the cabinet. The controller is further configured to: When the received voice signal includes control information for the screen, the screen is controlled to be contracted and expanded based on the control information.

6. A method for controlling a projection system, characterized in that: A controller for the projection system, wherein the projection system further comprises: a cabinet, and a projection device, a speaker, and a microphone located in the cabinet; the cabinet has a cover, and the projection device is used to project an image after the cover is opened; and the method comprises: receiving a power-on instruction for the projection system; Based on the power-on instruction, controlling the cover to open, controlling the speaker to emit an audio signal, and controlling the microphone to receive a voice signal; After receiving a closing instruction for the cover, an ultrasonic signal is emitted through the speaker, and the ultrasonic signal is received through the microphone to detect the distance between the cabinet and an obstacle outside the cabinet; When the distance is greater than a first threshold, the cover is controlled to close at a first speed; when the distance is between the first threshold and a second threshold, the cover is controlled to close at a second speed, the first threshold is greater than the second threshold, and the first speed is greater than the second speed; During the closing process of the cover, when the distance is less than the second threshold, controlling the cover to stop closing; The projection system further includes: a first switch, a second switch, an ultrasonic power amplifier component, and an audio power amplifier component; the first switch and the second switch are both connected to the controller, the ultrasonic power amplifier component and the audio power amplifier component are both connected to the first switch and the second switch, and the speaker is connected to the second switch; the method further includes: Based on the power-on instruction, the speaker is connected to the controller via the audio amplifier component by controlling the first switch and the second switch; Based on the shutdown instruction, the speaker is switched to be connected to the controller through the ultrasonic power amplifier component by controlling the first switch and the second switch; By sending a first electrical signal to the ultrasonic power amplifier component, the speaker is controlled to emit the ultrasonic signal; The projection system further includes: a low-noise amplifier and a third switch connected to the controller, wherein the third switch is further connected to the low-noise amplifier and the microphone; and the method further includes: Based on the power-on instruction, the microphone is connected to the controller by controlling the third switch; Based on the shutdown instruction, the microphone is periodically connected to the controller through the low-noise amplifier by controlling the third switch; the microphone is used to convert the received ultrasonic signal into a second electrical signal and input it into the low-noise amplifier, and the low-noise amplifier is used to amplify the received second electrical signal; determining the distance based on the second electrical signal amplified by the low-noise amplifier; Wherein, when the microphone is connected to the controller and not connected to the low noise amplifier, the voice signal is received through the microphone; When control information for the cover is present in the voice signal, opening and closing of the cover are controlled based on the control information.

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