A method for adjusting a sound curve, an LCD projector, a medium, and a product

Abstract

A method for adjusting a sound curve, an LCD projector, a medium and a product, which relate to the field of projectors. The method includes: obtaining a first preset distance from a target projector to a target projection screen, and obtaining the current screen size and current clarity of the picture projected by the target projector on the target projection screen; calculating a maximum visible distance of the projected picture according to the current screen size, the current clarity and a preset human eye vision range as a second preset distance; calculating a distance from the target projector to a target audience according to the first preset distance and the second preset distance to obtain a third preset distance; matching a corresponding preset sound curve based on the third preset distance, and adjusting the output sound curve of the target projector according to the preset sound curve. Implementing this method can improve the auditory effect of the LCD projector.

Description

Technical Field

[0001] This application relates to the field of projectors, and particularly to a method for adjusting a sound curve, an LCD projector, a medium, and a product. Background Art

[0002] People use LCD projectors in different viewing environments, such as living rooms, bedrooms, or outdoors. The spatial sizes and layouts of these environments vary. To obtain the best viewing experience, not only the picture quality but also the audio effect needs to be considered.

[0003] In the prior art, LCD projectors usually adopt fixed audio output settings, which include preset equalizer parameters, volume levels, and surround sound modes.

[0004] However, this fixed audio setting method has some limitations. In a small enclosed space, the fixed settings may cause the sound to be too muddy or produce echoes, while in an open environment, the sound may be relatively small. At the same time, when the viewer's position is far from the projector, the fixed volume setting may make the sound difficult to hear clearly; conversely, if the distance is too close, the sound may feel too harsh, resulting in a poor auditory effect. Summary of the Invention

[0005] This application provides a method for adjusting a sound curve, an LCD projector, a medium, and a product, which is used to improve the auditory effect of the LCD projector.

[0006] In a first aspect, this application provides a method for adjusting a sound curve, which is applied to an LCD projector. The method includes: obtaining a first preset distance from a target projector to a target projection screen, and obtaining the current picture size and current clarity of the picture projected by the target projector on the target projection screen; calculating a maximum visible distance of the projected picture according to the current picture size, the current clarity, and a preset human eye vision range, as a second preset distance; calculating a distance from the target projector to a target viewer according to the first preset distance and the second preset distance, to obtain a third preset distance; matching a corresponding preset sound curve based on the third preset distance, and adjusting the output sound curve of the target projector according to the preset sound curve.

[0007] By adopting the above technical solution, the first preset distance from the target projector to the target projection screen, the current screen size and clarity of the projected image are obtained. The maximum visible distance of the projected image, that is, the second preset distance, is calculated according to the current screen size, clarity and the preset human eye vision range, thereby determining the maximum distance at which the audience can watch comfortably. Then, the third preset distance from the target projector to the target audience is calculated according to the first preset distance and the second preset distance, and this distance reflects the actual viewing distance. Finally, the corresponding preset sound curve is matched based on the third preset distance, and the output sound curve of the target projector is adjusted so that the sound output can be optimized according to the actual position of the audience, thereby providing an audio effect more suitable for the position of the audience and improving the auditory effect of the LCD projector.

[0008] Combined with some embodiments of the first aspect, in some embodiments, before the step of obtaining the first preset distance from the target projector to the target projection screen and obtaining the screen size and clarity of the image projected by the target projector on the target projection screen, the method further includes: obtaining the model information of the target projector and the material information of the target projection screen; querying a preset projector parameter database according to the model information to obtain the light source type, brightness and contrast ratio of the target projector; obtaining the reflectivity and gain coefficient of the target projection screen from a preset screen parameter database based on the material information; calculating the theoretical maximum projection area of the target projector on the target projection screen according to the light source type, brightness, contrast ratio, reflectivity and gain coefficient; and taking the theoretical maximum projection area as the upper limit value of the current screen size.

[0009] By adopting the above technical solution, first, the model information of the target projector and the material information of the target projection screen are obtained, parameters such as the light source type, brightness and contrast ratio are obtained, the reflectivity and gain coefficient are obtained from a preset screen parameter database based on the material information. According to the light source type, brightness, contrast ratio, reflectivity and gain coefficient, the theoretical maximum projection area of the target projector on the target projection screen is calculated, and the theoretical maximum projection area is taken as the upper limit value of the current screen size, avoiding the problem of decreased image clarity caused by an overly large projection area, ensuring the quality of the projected image, and further improving the viewing experience.

[0010] In some embodiments in combination with some embodiments of the first aspect, after the step of matching a corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: detecting a change in ambient light intensity to obtain the current ambient light intensity; calculating a clarity influence coefficient based on the current ambient light intensity, and calculating a first clarity based on the clarity influence coefficient; calculating a maximum visible distance of the projected image according to the current image size, the first clarity, and a preset human eye vision range as a fourth preset distance; calculating a distance from the target projector to the target audience according to the first preset distance and the fourth preset distance to obtain a fifth preset distance; matching a corresponding current volume based on the fifth preset distance, and adjusting the output sound curve of the target projector according to the current volume.

[0011] By adopting the above technical solution, after matching and adjusting the sound curve based on the third preset distance, detecting a change in ambient light intensity to obtain the current ambient light intensity, calculating a clarity influence coefficient based on the current ambient light intensity, and calculating a first clarity based on the coefficient. Then, calculating a maximum visible distance of the projected image according to the current image size, the first clarity, and the preset human eye vision range as the fourth preset distance. Then, calculating a fifth preset distance according to the first preset distance and the fourth preset distance. Finally, matching a corresponding current volume based on the fifth preset distance, and adjusting the output sound curve of the target projector according to the current volume, so that the sound output can be optimized according to the ambient light change and the actual viewing distance.

[0012] In some embodiments in combination with some embodiments of the first aspect, after the step of matching a corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: obtaining a background noise level of the environment where the target projector is located; calculating a signal-to-noise ratio according to the background noise level and the third preset distance; if the signal-to-noise ratio is lower than a preset signal-to-noise ratio threshold, performing noise reduction processing on the output audio of the target projector.

[0013] By adopting the above technical solution, first obtaining the background noise level of the environment where the target projector is located, calculating a signal-to-noise ratio according to the background noise level and the third preset distance. The signal-to-noise ratio reflects the relative intensity relationship between the audio signal and the environmental noise. If the signal-to-noise ratio is lower than the preset signal-to-noise ratio threshold, performing noise reduction processing on the output audio of the target projector, which can effectively suppress the interference of background noise on the audio signal and improve the clarity and audibility of the audio.

[0014] In combination with some embodiments of the first aspect, in some embodiments, after the step of performing noise reduction processing on the output audio of the target projector if the signal-to-noise ratio is lower than a preset signal-to-noise ratio threshold, the method further includes: after the noise reduction processing, recalculating the signal-to-noise ratio based on the background noise level and the third preset distance; if the signal-to-noise ratio is still lower than the preset signal-to-noise ratio threshold, increasing the output volume of the target projector until the signal-to-noise ratio reaches the preset signal-to-noise ratio threshold or the output volume reaches the maximum value.

[0015] By adopting the above technical solution, after performing noise reduction processing on the output audio of the target projector, the signal-to-noise ratio is recalculated based on the background noise level and the third preset distance. If the signal-to-noise ratio is still lower than the preset signal-to-noise ratio threshold, the output volume of the target projector is increased until the signal-to-noise ratio reaches the preset signal-to-noise ratio threshold or the output volume reaches the maximum value, which can ensure that in the case of relatively large background noise, the intensity of the signal relative to the background noise is enhanced by increasing the volume, so as to ensure that the signal-to-noise ratio reaches an acceptable level.

[0016] In combination with some embodiments of the first aspect, in some embodiments, after the step of matching a corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: dividing different projection environments where the target projector is located into different viewing scenarios; recording the audio settings of the target projector in different viewing scenarios, where the audio settings are the audio settings with the highest usage frequency and the longest duration, to obtain a viewing scenario - audio setting mapping table; identifying the current projection environment to obtain the current viewing scenario, and matching the current audio setting corresponding to the current viewing scenario in the viewing scenario - audio setting mapping table; adjusting the output sound curve of the target projector based on the current audio setting.

[0017] By adopting the above technical solution, different projection environments where the target projector is located are divided into different viewing scenarios. Then, the audio settings with the highest usage frequency and the longest duration of the target projector in different viewing scenarios are recorded to obtain a viewing scenario - audio setting mapping table. The current projection environment is identified to obtain the current viewing scenario, and the current audio setting corresponding to the current viewing scenario is matched in the mapping table. Finally, the output sound curve of the target projector is adjusted based on the current audio setting, so that the audio output of the projector can better adapt to different viewing scenarios and provide an audio effect more in line with the scene requirements for the audience.

[0018] In combination with some embodiments of the first aspect, in some embodiments, after the step of matching a corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: obtaining the real-time state of a target microphone connected to the target projector; if receiving audio information in the target microphone, reducing the output volume of the target projector to a preset volume threshold.

[0019] By adopting the above technical solution, the real-time state of the target microphone connected to the target projector is obtained. If receiving audio information in the target microphone, the output volume of the target projector is reduced to a preset volume threshold. When there is an audio signal input to the microphone, it indicates that there may be a voice communication in progress or other important sounds that need to be captured. At this time, reducing the volume of the projector can avoid its sound interfering with the audio content of the microphone, ensuring that the microphone can clearly collect the required sounds. The audience can use the microphone without being disturbed by the excessive volume of the projector, and at the same time, the normal use effect of the microphone is also guaranteed, improving the overall use experience.

[0020] In a second aspect, an embodiment of the present application provides an LCD projector, which includes: one or more processors and a memory; the memory is coupled to the one or more processors, and the memory is used to store computer program code, and the computer program code includes computer instructions. The one or more processors call the computer instructions to enable the LCD projector to execute the method described in the first aspect and any possible implementation manner in the first aspect.

[0021] In a third aspect, an embodiment of the present application provides a computer program product containing instructions. When the above computer program product runs on an LCD projector, it enables the above LCD projector to execute the method described in the first aspect and any possible implementation manner in the first aspect.

[0022] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, including instructions. When the above instructions run on an LCD projector, it enables the above LCD projector to execute the method described in the first aspect and any possible implementation manner in the first aspect.

[0023] It can be understood that the LCD projector provided in the second aspect above, the computer program product provided in the third aspect, and the computer storage medium provided in the fourth aspect are all used to execute the method provided in the embodiments of the present application. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method, which will not be elaborated here.

[0024] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0025] 1. This application determines the maximum visible distance of the projected image, i.e., the second preset distance, by obtaining the first preset distance from the target projector to the target projection screen, as well as the current size and clarity of the projected image. Then, based on the current size, clarity, and the preset human eye vision range, the maximum visible distance of the projected image is calculated, which is the second preset distance, thus determining the farthest distance at which the audience can watch comfortably. Subsequently, the third preset distance from the target projector to the target audience is calculated based on the first preset distance and the second preset distance, and this distance reflects the actual viewing distance. Finally, the corresponding preset sound curve is matched based on the third preset distance, and the output sound curve of the target projector is adjusted so that the sound output can be optimized according to the actual position of the audience, thereby providing an audio effect more suitable for the audience's position and improving the auditory effect of the LCD projector.

[0026] 2. After matching and adjusting the sound curve based on the third preset distance, this application detects the change in ambient light intensity to obtain the current ambient light intensity, calculates the clarity influence coefficient based on the current ambient light intensity, and calculates the first clarity based on this coefficient. Then, based on the current size of the image, the first clarity, and the preset human eye vision range, the maximum visible distance of the projected image is calculated as the fourth preset distance. Subsequently, the fifth preset distance is calculated based on the first preset distance and the fourth preset distance. Finally, the corresponding current volume is matched based on the fifth preset distance, and the output sound curve of the target projector is adjusted according to this current volume so that the sound output can be optimized according to the ambient light change and the actual viewing distance.

[0027] 3. After the step of matching the corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to this preset sound curve, the method further includes: obtaining the real-time status of the target microphone connected to the target projector; if the audio information in the target microphone is received, reducing the output volume of the target projector to the preset volume threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a scenario diagram of the sound curve adjustment method in an embodiment of this application;

[0029] Figure 2 is a flowchart of the sound curve adjustment method in an embodiment of this application;

[0030] Figure 3 is another flowchart of the sound curve adjustment method in an embodiment of this application;

[0031] Figure 4 is yet another flowchart of the sound curve adjustment method in an embodiment of this application;

[0032] Figure 5It is a schematic structural diagram of an entity device of the LCD projector in the embodiments of the present application. Detailed implementation manners

[0033] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the specification of the present application, the singular forms "a", "an", "the above", "the", and "this" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in the present application refers to any and all possible combinations including one or more of the listed items.

[0034] Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] For ease of understanding, the application scenarios of the embodiments of the present application are introduced below.

[0036] As Figure 1 shown, Figure 1 is a scenario diagram of the sound curve adjustment method in the embodiments of the present application;

[0037] In Figure 1 , the LCD projector is installed in a room, projects a picture onto a screen, the screen receives the picture of the projector, is located on one side of the room, the audience sits at different positions in the room, watches the projection picture, the projection picture is displayed on the screen and is used to display a document. The first preset distance is the actual distance from the LCD projector to the target projection screen. The picture projected by the projector on the screen is also shown, and its size and clarity are important parameters obtained in the method. Using these parameters and combining with the preset human eye vision range, the system calculates the second preset distance, that is, the maximum visible distance of the projection picture. The third preset distance is calculated based on the first preset distance and the second preset distance, and represents the estimated distance from the projector to the target audience. Based on the third preset distance, the system will match the corresponding preset sound curve and adjust the output sound curve of the projector accordingly.

[0038] For ease of understanding, the method provided in this embodiment is described in terms of a process below in combination with the above scenario. Please refer to Figure 2 , which is a schematic flowchart of the sound curve adjustment method in the embodiments of the present application.

[0039] S201. Obtain the first preset distance from the target projector to the target projection screen, and obtain the current screen size and current clarity of the image projected by the target projector on the target projection screen.

[0040] Among them, the target projector refers to the LCD projector that needs to adjust the sound curve; the target projection screen refers to the screen or wall used to receive the projected image of the projector; the first preset distance is used to represent the actual distance between the projector and the projection screen; the current screen size refers to the actual size of the image projected by the projector on the projection screen; the current clarity is used to represent the clarity of the projected image.

[0041] Specifically, before starting to adjust the sound curve, it is first necessary to obtain the basic parameters of the projection environment, measure the actual distance from the projector to the screen through measurement or sensors as the first preset distance. At the same time, obtain the actual size of the projected image on the screen through image processing technology or built-in sensors as the current screen size. In addition, it is also necessary to measure the clarity of the projected image through image analysis algorithms or optical sensors to obtain the current clarity value.

[0042] In some embodiments, the above parameters can be obtained in various ways: Optionally, the projector can be equipped with a distance sensor to measure the distance to the screen by emitting and receiving ultrasonic waves or infrared rays; at the same time, the projector can use the built-in camera to capture the projected image, and calculate the screen size and analyze the clarity through image processing algorithms. Optionally, when the projector is started, the projection distance and screen size can be manually input by the user, and the built-in test pattern and optical sensors of the projector can be used to evaluate the clarity. It can be understood that other ways can also be used to obtain the parameters, which are not limited here.

[0043] S202. Calculate the maximum visible distance of the projected image according to the current screen size, the current clarity and the preset human eye vision range as the second preset distance.

[0044] Among them, the maximum visible distance represents the farthest distance at which the audience can comfortably view the projected image; the preset human eye vision range refers to the standard range of normal human eye vision; the second preset distance is used to represent the calculated maximum visible distance.

[0045] Specifically, this step aims to determine the ideal distance range for the audience to view the projection image. By combining the current screen size, clarity and the physiological characteristics of the human eye vision, an optimal viewing distance is calculated. The calculation process involves visual models and ergonomic principles. For example, the relationship between the screen size and the human eye's field of view angle can be used, combined with the impact of clarity on visual perception, and factors such as the minimum distinguishable details under standard vision, and the maximum visible distance can be obtained through specific algorithms.

[0046] In some embodiments, the calculation of the maximum visible distance can be achieved in various ways: Optionally, a preset calculation formula can be used, substituting the screen size, clarity, and standard visual acuity value to directly calculate the maximum visible distance. Optionally, according to the length of the diagonal of the current projection screen, referring to a certain viewing angle (generally 30 - 60 degrees), calculate the maximum comfortable viewing distance d1 at the corresponding viewing angle. According to the clarity evaluation result of the current screen, look up the clarity correction coefficient k (preset in the database). The higher the clarity, the larger the k value. Convert the standard human eye vision range to the minimum visual target size s that can be recognized, and compare it with the pixel size of the current screen to obtain the correction coefficient m. The maximum visible distance = d1 * k * m, and finally obtain the maximum visible distance result. Other methods can also be used, which are not limited here.

[0047] S203. Calculate the distance from the target projector to the target audience according to the first preset distance and the second preset distance to obtain a third preset distance.

[0048] Among them, the target audience refers to the actual crowd watching the projection screen; the third preset distance represents the estimated distance from the projector to the actual audience. The first preset distance is the actual distance from the projector to the projection screen, and the second preset distance is the calculated maximum visible distance. These distance parameters are used to determine the optimal sound output settings.

[0049] This step is executed during the initialization or setting adjustment of the projection device. Specifically, first read the values of the first preset distance and the second preset distance. Then, based on the room acoustics principle, considering the propagation characteristics of sound waves in space, assume that the audience position is at the middle position of the maximum visible distance, or make a more complex estimation according to the room layout. Input the first preset distance and the second preset distance into a preset calculation model, which takes into account factors such as room shape and expected number of audiences. The calculation model outputs an estimated value, that is, the third preset distance. This third preset distance is used as a key parameter for subsequent sound curve adjustment.

[0050] In some embodiments, the calculation of the distance from the target projector to the target audience is achieved in various ways: Optionally, use the simple arithmetic mean method. Set the first preset distance as the minimum viewing distance, add the second preset distance to the first preset distance to obtain the maximum viewing distance, calculate the average value of the minimum viewing distance and the maximum viewing distance, and set the calculation result as the third preset distance. This method is simple and direct and is suitable for most conventional viewing environments. Optionally, use the weighted calculation method. First, according to the room size and the expected number of viewers, assign weights to the minimum viewing distance and the maximum viewing distance, multiply the minimum viewing distance and the maximum viewing distance by their respective weights respectively, and add the two products. Then, divide the added result by the sum of the weights. Finally, set the calculation result as the third preset distance.

[0051] It can be understood that there are other ways to calculate the distance, which are not limited here.

[0052] S204. Match a corresponding preset sound curve based on the third preset distance, and adjust the output sound curve of the target projector according to the preset sound curve.

[0053] Among them, the preset sound curve refers to a set of audio output parameters designed in advance according to different listening distances, including volume, equalizer settings, sound field modes, etc.; the output sound curve represents the actual audio characteristics output by the projector. The matching process refers to selecting the most suitable preset sound curve according to the calculated viewer distance. The adjustment process refers to adjusting the audio output parameters of the projector to the parameters of the selected preset sound curve.

[0054] Specifically, first access the preset sound curve database, which stores the sound parameter settings optimized for different viewing distances. Use the third preset distance as the query condition to find the closest preset sound curve in the database. If there is no exactly matching curve, use the interpolation method to generate a new curve. Next, read the current audio output parameters of the projector and compare them with the selected preset sound curve. Gradually adjust each parameter, including volume, bass, treble, midrange, surround sound effect, etc., to make it consistent with the preset curve.

[0055] In some embodiments, the matching and adjustment of the sound curve are implemented in multiple ways: Optionally, first divide the third preset distance range into several intervals. Then, assign a preset sound curve to each interval and determine the interval where the third preset distance is located. After that, call the preset sound curve corresponding to the interval and adjust the audio output parameters of the projector to the settings of the preset curve at one time. Optionally, use the smooth transition method. First, find the two preset sound curves closest to the third preset distance. Then, calculate the relative positions of the third preset distance and the corresponding distances of the two curves. Next, calculate the interpolation coefficient according to the relative positions. After that, use the interpolation coefficient to perform weighted averaging on the parameters of the two preset curves to generate a temporary sound curve. Finally, gradually adjust the audio output parameters of the projector to the settings of the temporary curve, with a small adjustment amplitude each time to achieve a smooth transition. It can be understood that there are other ways to implement the matching and adjustment of the sound curve, which are not limited here.

[0056] The following further describes the more specific process of the method provided in this embodiment. Please refer to Figure 3 , which is another process schematic diagram of the sound curve adjustment method in the embodiments of the present application.

[0057] S301. Obtain the model information of the target projector and the material information of the target projection screen.

[0058] The model information of the target projector refers to the specific brand and model of the projector, and the material information of the target projection screen refers to the material type of the screen, such as PVC plastic, cloth surface, etc.

[0059] In this step, the projector needs to obtain its own model information and the material information of the projection screen used. The model information can be obtained from the projector's settings or OEM information, and the material information can be obtained through user input or automatic recognition.

[0060] Specific implementation methods can include: when the projector starts up, actively read the model parameters stored internally, the user manually selects the model in the projector menu, use an RFID reader to scan the electronic tag on the projector to obtain the model, use radio frequency signals to detect the screen material and query the database to map the material type. Obtaining accurate parameters will improve the quality of subsequent sound adjustment.

[0061] S302. Query the preset projector parameter database according to the model information to obtain the light source type, brightness, and contrast of the target projector.

[0062] The preset projector parameter database stores the optical parameters of different model projectors. According to the obtained model information, the corresponding light source type, light source brightness, contrast, and other parameters of the projector model can be found in the database.

[0063] Specifically, a database or table containing the parameters of each model projector is established in advance. The database can be located in the internal storage of the projector or on a cloud server, and contains fields such as manufacturer, model, light source type, brightness, contrast, etc. After obtaining the model of the target projector, send a query request to the database, and the database returns the corresponding optical parameters. It is also possible to obtain the optical parameters of a specified model using an online query interface.

[0064] S303. Obtain the reflectivity and gain coefficient of the target projection screen from the preset screen parameter database based on the material information.

[0065] The preset screen parameter database stores the optical characteristic parameters of different material screens. According to the obtained material information, search the database to obtain the corresponding reflectivity and gain coefficient.

[0066] Specifically, construct a database or table containing the parameters of various screen materials, including fields such as material type, reflectivity, gain coefficient, etc. After obtaining the material of the target screen, query the database to obtain the corresponding parameters. It is also possible to obtain the optical parameters of a specific material using an online material query interface.

[0067] S304. Calculate the theoretical maximum projection area of the target projector on the target projection screen according to the light source type, brightness, contrast, reflectivity, and gain coefficient.

[0068] First, calculate the theoretical maximum projection area of the projector on a specific projection screen. This calculation is based on several key parameters: light source type, brightness, contrast ratio, reflectivity, and gain coefficient. First, the light source type (such as LED or laser) affects the basic characteristics and distribution of light; brightness defines the luminous intensity of the light source; the contrast ratio affects the distinguishability between bright and dark parts in the image; reflectivity refers to the ratio of light reflected by the screen surface; and the gain coefficient describes the ability of the screen to enhance the projected light.

[0069] Adopt a preset optical transfer function formula in the form of: Theoretical maximum projection area = Optical transfer function(light source type, brightness, contrast ratio, reflectivity, gain coefficient). This function integrates the above parameters to calculate the maximum area that the projector can clearly project on the screen under the given optical and physical conditions. The optical transfer function is usually developed by optical engineers based on experimental data or theoretical models to ensure that it can accurately reflect the behavior and effects of light under different conditions.

[0070] S305. Take this theoretical maximum projection area as the upper limit value of the current screen size.

[0071] The current screen size refers to the size of the image actually projected by the projector on the screen. The theoretical maximum projection area is the maximum possible clear projection area calculated based on optical conditions. If the current actual projection size exceeds this upper limit value, then take this upper limit value as the current screen size parameter, which can avoid the problem of image clarity degradation caused by an overly large projection area. The current screen size can be obtained. Compare the current screen size with the theoretical maximum area. If the current screen size is greater than the theoretical value, then take the theoretical value as the parameter of the current screen size, otherwise keep the current screen size unchanged.

[0072] S306. Obtain the first preset distance from the target projector to the target projection screen, and obtain the current screen size and current clarity of the image projected by the target projector on the target projection screen.

[0073] The first preset distance is the actual distance between the projector and the screen. The current screen size is the size of the image actually projected by the projector. The current clarity is the actual clarity of the projected image. The distance can be obtained using a ranging device or manually input. The screen size can be obtained from the internal parameters of the machine or image processing. The clarity can be obtained using built-in detection. The specific implementation can include: measuring the distance using a laser or ultrasonic rangefinder, the user inputting the distance parameter in the menu, analyzing the projected image to obtain the actual size, and using a contrast detection algorithm to calculate the clarity.

[0074] S307. Calculate the maximum visible distance of the projected image based on the current screen size, the current clarity, and the preset human eye vision range, and take it as the second preset distance.

[0075] In this step, the maximum visible distance of the projected image, i.e., the second preset distance, is calculated using the information obtained in S306. The calculation process comprehensively considers the current image size, current clarity, and the preset human eye vision range. The image size determines the level of detail of the image content. A larger image generally allows for a farther viewing distance. Clarity directly affects the ease of identifying the image. High clarity enables the audience to maintain a good viewing experience at a farther distance. The preset human eye vision range defines the minimum details that can be recognized by the human eye at different viewing distances, based on a standard visual acuity chart (such as the range from 20 / 20 to 20 / 60). Applying the human eye viewing angle calculation formula and combining the above factors, the maximum visible distance is obtained. For example, for a 100-inch diagonal image with a clarity score of 80 out of 100, considering the normal human eye vision range, the calculated maximum visible distance is approximately 18 feet. This distance ensures that the vast majority of the audience within the range can clearly identify the image details.

[0076] S308. Calculate the distance from the target projector to the target audience based on the first preset distance and the second preset distance to obtain the third preset distance.

[0077] Specifically, the arithmetic mean of the first distance and the second distance can be simply calculated as the third distance, or weighted calculation can be used. According to factors such as the room area and the number of audiences, weights are set for the first and second distances, and the weighted average is calculated as the third distance. Combining the room layout, sensors are used to determine the room shape and area, and the most likely distance range of the audience is calculated and averaged.

[0078] S309. Match the corresponding preset sound curve based on the third preset distance, and adjust the output sound curve of the target projector according to the preset sound curve.

[0079] After determining the third preset distance, the sound output needs to be adjusted to adapt to this distance. In this step, first, the preset sound curve that best matches the third distance is searched in the sound curve database. This curve optimizes parameters such as volume, equalizer, and reverb to adapt to the audio effects at this distance. Then, the audio output parameters of the projector are adjusted to the settings of this preset curve to complete the audio adjustment process.

[0080] Sound curve matching needs to comprehensively consider factors such as volume attenuation and environmental reverberation. The adjustment process can be a one-time adjustment or a progressive adjustment in multiple steps to ensure a smooth transition of the sound quality. Using a custom sound curve can optimize the audio effects at a specific distance.

[0081] S310. Detect the change in ambient light intensity to obtain the current ambient light intensity.

[0082] Detect the change in ambient light intensity to obtain the current ambient light intensity. The ambient light intensity refers to the brightness of the light in the indoor and outdoor surrounding environment, which will have a certain impact on the projection effect. In this step, a photosensitive sensor needs to be set up. By detecting the change in ambient light, a voltage signal is output in real time and converted into a value representing the light intensity according to a certain ratio as the current ambient light intensity. In this way, we can obtain the actual light intensity value in the current environment. For example, a photosensitive resistor sensor with a relatively high sampling frequency can be used to detect its output voltage value and convert it into the current ambient light intensity according to the formula "output voltage value × 100". It is also possible to use a camera and image processing algorithms to analyze the change in the brightness of the picture to detect the light intensity. Obtaining the current light intensity value is a prerequisite for calculating the impact of light on clarity.

[0083] S311. Calculate the clarity influence coefficient based on the current ambient light intensity, and calculate the first clarity based on the clarity influence coefficient.

[0084] Calculate the clarity influence coefficient based on the current ambient light intensity, and calculate the first clarity based on the clarity influence coefficient. Strong light will reduce the clarity of the projection screen, so it is necessary to calculate the degree of influence of light on clarity. In this step, first, based on a preset light influence model, take the currently detected light intensity value as the input variable, and calculate a clarity influence coefficient representing the degree of influence of light on clarity. Then multiply this influence coefficient by the existing current clarity value to consider the influence of light on clarity and obtain an updated clarity value as the first clarity. For example, if the current clarity is 80 and the influence coefficient calculated according to the current light intensity is 0.8, then the first clarity is 80 * 0.8 = 64.

[0085] S312. Calculate the maximum visible distance of the projected screen based on the current screen size, the first clarity, and the preset human eye vision range as the fourth preset distance.

[0086] Calculate the maximum visible distance of the projected screen based on the current screen size, the first clarity, and the preset human eye vision range as the fourth preset distance. This step is similar to the calculation process of S307. The difference is that the first clarity is used to replace the original current clarity, and based on the current screen size, the updated clarity value, and the standard human eye vision range, the maximum visible distance considering the influence of light is recalculated as the fourth preset distance. This fourth preset distance will be used as a new reference distance value for adjusting the volume parameter in the next step.

[0087] S313. Calculate the distance from the target projector to the target audience based on the first preset distance and the fourth preset distance to obtain the fifth preset distance.

[0088] The first preset distance is the actual distance between the projector and the screen, and the fourth preset distance is the maximum visible distance calculated after considering the change in ambient light. This step requires calculating the distance from the projector to the target audience as the fifth preset distance. The calculation can be performed in a variety of ways: simply taking the arithmetic mean of the two distances as the fifth preset distance, assigning certain weights to the two distances according to factors such as room area and layout, calculating the weighted average distance as the fifth distance, using sensors to detect the shape of the room and regional distribution, and combining the two distances to calculate the most likely distance of the audience. The calculated fifth preset distance will serve as an important reference for subsequent volume output adjustment. For example, if the first distance is 3 meters and the fourth distance is detected as 5 meters, the average value of the two can be simply calculated as 4 meters as the fifth preset distance, or the first distance and the fourth distance can be weighted according to the room area ratio, and the weighted average distance can be calculated as the fifth distance according to a certain ratio.

[0089] S314: Match the corresponding current volume based on the fifth preset distance, and adjust the output sound curve of the target projector according to the current volume.

[0090] After calculating the fifth preset distance, the complete sound output curve needs to be adjusted to optimize the audio effect at this distance. First, the sound curve parameters that best suit the fifth preset distance will be searched in the sound curve database as the current sound curve. The current sound curve contains complete audio settings such as volume parameters, equalizer parameters, reverberation effects, etc. Then, the current audio output parameters of the projector will be gradually adjusted to meet the various setting requirements of the current sound curve. The adjustment process can be adjusted once or in multiple gradual adjustments to ensure a smooth transition of sound quality. Using a sound curve corresponding to a specific distance can optimize the audience's auditory experience. The matching of the current sound curve and the adjustment process of the output sound curve are similar to those implemented in step S204. In some embodiments, after step 309, the following steps may also be included:

[0091] like Figure 4 As shown, Figure 4 It is another flow chart of the sound curve adjustment method in the embodiment of the present application.

[0092] S401, obtaining the background noise level of the environment where the target projector is located.

[0093] This step is to obtain the magnitude of the background noise present in the environment where the projector is located, that is, the noise intensity. Excessive ambient noise will seriously affect the auditory effect of the audience. The implementation method is to use a microphone to collect ambient noise samples, analyze the spectral characteristics of the noise, calculate the corresponding noise intensity value, expressed in decibels, as the background noise level. Multiple microphones can also be set up to locate the position of the background noise through beamforming technology to obtain a more accurate noise intensity. Whether the parameter of the background noise level is accurate directly affects the subsequent signal-to-noise ratio calculation and noise reduction processing effect.

[0094] S402. Calculate the signal-to-noise ratio based on this background noise level and the third preset distance.

[0095] First, the parameter of the background noise level is required, that is, the intensity of the ambient noise. The third preset distance is also required, which is the distance from the projector to the audience calculated previously. After obtaining these two parameters, an acoustic propagation model can be established. According to the distance, calculate the attenuation amplitude of the audio signal, and then take the ratio with the background noise intensity to obtain the ratio of the signal to the noise, that is, the signal-to-noise ratio.

[0096] S403. If the signal-to-noise ratio is lower than the preset signal-to-noise ratio threshold, perform noise reduction processing on the output audio of the target projector.

[0097] If the signal-to-noise ratio is lower than the preset signal-to-noise ratio threshold, perform noise reduction processing on the output audio of the target projector. Determine whether the previously calculated signal-to-noise ratio is lower than the preset signal-to-noise ratio threshold. This threshold can be set according to experience, generally between 15 - 20 decibels. If the signal-to-noise ratio is lower than the threshold, it means that the background noise has a great impact on the sound quality. At this time, it is necessary to start the noise reduction processing process to process the audio signal to improve the sound quality. Common noise reduction technologies include beamforming, adaptive filtering, etc.

[0098] S404. After this noise reduction processing, recalculate the signal-to-noise ratio based on this background noise level and the third preset distance.

[0099] Noise reduction processing is a process of using algorithm technology to suppress background noise and improve audio clarity. After the noise reduction processing is completed, the signal-to-noise ratio needs to be recalculated. This is because the noise reduction processing itself will change the intensity and spectral characteristics of the background noise. The recalculated signal-to-noise ratio can evaluate the effect of the noise reduction processing and provide a basis for the next volume adjustment. The calculation method is the same as that in step S402 before, only using the updated background noise intensity level, combined with the third preset distance to calculate the intensity of the signal after propagation, and taking the ratio with the background noise intensity to obtain the new signal-to-noise ratio. It is also possible to directly use a sensor to detect the residual noise in the actual environment after noise reduction to obtain a more accurate noise level.

[0100] S405. If the signal-to-noise ratio is still lower than the preset signal-to-noise ratio threshold, increase the output volume of the target projector until the signal-to-noise ratio reaches the preset signal-to-noise ratio threshold or the output volume reaches the maximum value.

[0101] After recalculating the signal-to-noise ratio, it is necessary to determine whether the newly calculated signal-to-noise ratio is still lower than the preset signal-to-noise ratio threshold. This threshold can be set according to experience, generally between 15 - 20 decibels. If the signal-to-noise ratio is still lower than the threshold, it means that the noise reduction effect is not sufficient, and the output volume needs to be further increased to enhance the intensity of the signal relative to the background noise. The volume will continue to increase until the signal-to-noise ratio reaches or exceeds the preset threshold, or the volume has reached the maximum output limit of the device.

[0102] If it is higher than the signal-to-noise ratio threshold, there is no need to perform the noise reduction operation again.

[0103] S406. Divide the different projection environments where the target projector is located into different viewing scenarios.

[0104] A viewing scenario refers to the type of place where a projector is used with similar environmental characteristics, such as a home living room, a corporate meeting room, a classroom, etc. The purpose of dividing the projection environment into different viewing scenarios is to select different audio output strategies according to the scenario later. For example, a home environment can be divided into a "home theater" viewing scenario, and a classroom environment can be set as a "teaching demonstration" viewing scenario. For different viewing scenarios, different sound curves, volume levels, sound effect modes, etc. can be preset to obtain the optimal viewing audio effect. The division of scenarios can be selected by the user himself or can be intelligently divided by automatically identifying environmental characteristics.

[0105] S407. Record the audio settings of the target projector in different viewing scenarios. The audio settings are the audio settings with the highest usage frequency and the longest duration, and obtain a viewing scenario - audio setting mapping table.

[0106] This step needs to record which audio parameter combinations the user has adjusted in different viewing scenarios of the projector. Among them, the audio setting combination with the highest usage frequency and the longest usage time will be determined as the most satisfactory and suitable setting for the user in this scenario. Record each scenario and the corresponding satisfactory audio settings as the optimal audio settings for this scenario. Finally, form a mapping table from the viewing scenario to the audio settings.

[0107] Specifically, the projector needs to have internal storage to record all audio setting adjustments made by the user at different times, including parameters such as volume, bass, treble, surround sound mode, etc. Then, using statistical analysis algorithms, calculate which set of audio settings is used most frequently and for the longest time in each scenario, that is, the user uses this setting the most times and often keeps it unchanged for a long time. In this way, it can be determined that this set of audio settings is the best setting for this scenario. Repeat this process to obtain the optimal audio settings corresponding to each viewing scenario, and finally generate a mapping table.

[0108] S408. Identify the current projection environment to obtain the current viewing scenario, and match the current audio settings corresponding to the current viewing scenario in the viewing scenario - audio setting mapping table.

[0109] In this step, it is first necessary to analyze and judge the current projection environment to identify which predefined viewing scenario it belongs to. Environmental characteristics can be obtained by taking photos, recording videos, capturing environmental audio, etc., and then using algorithm technologies such as image recognition and speech recognition to compare the similarity between the environmental characteristics and the preset scenario templates to obtain the current scenario. After determining the scenario, the audio settings corresponding to this scenario can be found in the previously established mapping table as the audio settings for the current projection environment.

[0110] S409. Adjust the output sound curve of the target projector based on the current audio settings.

[0111] After determining the audio settings corresponding to the current environment, the actual sound output of the projector can be adjusted according to this setting. Read the parameter values in the current audio settings, including various audio parameters such as volume size, bass gain, treble attenuation, etc. Then modify the current sound output curve of the projector at the software level to adjust each parameter value to the value in the current audio settings.

[0112] It can be understood that S406~S409 can be executed after S405 or after S309, and there is no limitation here.

[0113] S410. Obtain the real - time status of the target microphone connected to the target projector.

[0114] This step requires real-time monitoring of the working status of the target microphone device connected to the projector via wired or wireless means. The core is to determine whether there is an audio signal input to the microphone. The implementation method is to establish a data channel to continuously receive the real-time status data transmitted by the microphone, and judge whether there is sound input to the microphone based on the status data. It is also possible to directly sample the audio signal intensity of the microphone. If the intensity continuously exceeds the set threshold, it is determined that there is an audio input to the microphone. Obtaining the real-time status of the microphone is the basis for adjusting the volume of the projector according to the status subsequently.

[0115] S411. If the audio information in the target microphone is received, lower the output volume of the target projector to a preset volume threshold.

[0116] If it is detected through the foregoing method that there is indeed an audio signal input in the target microphone, it means that the microphone is picking up ambient sound or human voices. Then the projector needs to correspondingly lower its volume output to avoid interfering with or overriding the microphone audio content. The volume output of the projector needs to be lowered to a preset volume threshold, which needs to be pre-configured and is generally set to a relatively low volume level. The specific implementation method is that the projector internally maintains the volume threshold parameter. When it detects that there is a signal input to the microphone, it automatically controls the volume adjustment module to lower the volume level to the preset threshold level. This can avoid the excessive volume of the projector affecting the microphone collection effect.

[0117] It can be understood that S410~S411 can be executed after S409 or after S309, and there is no limitation here.

[0118] The following describes the LCD projector in the embodiment of the present invention application from the perspective of hardware processing. Please refer to Figure 5 , which is a schematic structural diagram of a physical device of the LCD projector in the embodiment of the present application.

[0119] It should be noted that Figure 5 The structure of the LCD projector shown is only an example and should not bring any limitations to the functions and usage scope of the embodiments of the present invention.

[0120] Such as Figure 5As shown, the LCD projector includes a Central Processing Unit (CPU) 501, which can perform various appropriate actions and processes according to the program stored in the Read-Only Memory (ROM) 502 or the program loaded from the storage section 508 into the Random Access Memory (RAM) 503, such as executing the method described in the above embodiments. In the RAM 503, various programs and data required for system operation are also stored. The CPU 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An Input / Output (I / O) interface 505 is also connected to the bus 504.

[0121] The following components are connected to the I / O interface 505: an input section 506 including an audio input device, a button switch, etc.; an output section 507 including a Liquid Crystal Display (LCD), an audio output device, an indicator light, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read from it can be installed into the storage section 508 as needed.

[0122] Specifically, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network via the communication section 509, and / or installed from the removable medium 511. When the computer program is executed by the Central Processing Unit (CPU) 501, various functions defined in the present invention are executed.

[0123] It should be noted that specific examples of computer-readable storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fibers, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In the present invention, a computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0124] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present invention. Among them, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the above module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the accompanying drawings.

[0125] Specifically, the LCD projector in this embodiment includes a processor and a memory, and a computer program is stored on the memory. When the computer program is executed by the processor, the sound curve adjustment method provided in the above embodiment is implemented.

[0126] On the other hand, the present invention also provides a computer-readable storage medium, which may be included in the LCD projector described in the above embodiment; or it may exist separately without being assembled into the LCD projector. The above storage medium carries one or more computer programs. When the above one or more computer programs are executed by a processor of an LCD projector, the LCD projector implements the sound curve adjustment method provided in the above embodiment.

[0127] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

[0128] As used in the foregoing embodiments, depending on the context, the term "when" may be construed to mean "if" or "after" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "upon determining" or "if (the stated condition or event) is detected" may be construed to mean "if determined" or "in response to determining" or "when (the stated condition or event) is detected" or "in response to detecting (the stated condition or event)".

[0129] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the foregoing embodiments can be implemented. The processes can be completed by relevant hardware instructed by a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the foregoing method embodiments. The foregoing storage medium includes various media that can store program codes, such as ROM or random access memory RAM, magnetic disks, or optical discs.

Claims

1. A method for adjusting a sound curve, characterized in that: Applied to an LCD projector, the method comprises: Acquire a first preset distance from a target projector to a target projection screen, and acquire a current image size and a current definition of an image projected by the target projector on the target projection screen; The maximum visible distance of the projected image is calculated according to the current image size, the current clarity and the preset human eye vision range as the second preset distance. The maximum visible distance is calculated as follows: according to the length of the diagonal of the current projection image and the reference field of view angle (30-60 degrees), the maximum comfortable viewing distance d1 under the corresponding field of view angle is calculated. According to the clarity evaluation result of the current image, the clarity correction coefficient k (preset in the database) matching it is searched, and the standard human eye vision range is converted into the minimum recognizable sight mark size s. Compared with the current image pixel size, the correction coefficient m is obtained, and the maximum visible distance = d1*k*m, and finally the maximum visible distance result is obtained; The distance from the target projector to the target audience is calculated according to the first preset distance and the second preset distance to obtain a third preset distance, wherein the third preset distance is calculated by: using a weighted calculation method to assign weights to the minimum viewing distance and the maximum viewing distance according to the room size and the expected number of viewers, multiplying the minimum viewing distance and the maximum viewing distance by their respective weights, adding the two products, dividing the addition result by the sum of the weights, and setting the calculation result as the third preset distance; A corresponding preset sound curve is matched based on the third preset distance, and an output sound curve of the target projector is adjusted according to the preset sound curve.

2. The method according to claim 1, characterized in that Before the step of obtaining a first preset distance from the target projector to the target projection screen, and obtaining the image size and clarity of the image projected by the target projector on the target projection screen, the method further includes: Obtaining model information of the target projector and material information of the target projection screen; Querying a preset projector parameter database according to the model information to obtain the light source type, brightness and contrast of the target projector; Based on the material information, the reflectivity and gain coefficient of the target projection screen are obtained from a preset screen parameter database; Calculate the theoretical maximum projection area of ​​the target projector on the target projection screen according to the light source type, brightness, contrast, reflectivity and gain coefficient; The theoretical maximum projection area is used as the upper limit of the current picture size.

3. The method according to claim 1, characterized in that After the step of matching the corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: Detect the change of ambient light intensity and obtain the current ambient light intensity; Calculating a clarity influence coefficient according to the current ambient light intensity, and calculating a first clarity based on the clarity influence coefficient; Calculating the maximum visible distance of the projected image according to the current image size, the first definition, and a preset human eye vision range as a fourth preset distance; Calculating the distance from the target projector to the target audience according to the first preset distance and the fourth preset distance to obtain a fifth preset distance; The corresponding current volume is matched based on the fifth preset distance, and the output sound curve of the target projector is adjusted according to the current volume.

4. The method according to claim 1, characterized in that: After the step of matching the corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: Obtaining the background noise level of the environment where the target projector is located; Calculating a signal-to-noise ratio according to the background noise level and the third preset distance; If the signal-to-noise ratio is lower than a preset signal-to-noise ratio threshold, noise reduction processing is performed on the output audio of the target projector.

5. The method according to claim 4, characterized in that After the step of performing noise reduction processing on the output audio of the target projector if the signal-to-noise ratio is lower than a preset signal-to-noise ratio threshold, the method further includes: After the noise reduction process, recalculating the signal-to-noise ratio based on the background noise level and the third preset distance; If the signal-to-noise ratio is still lower than the preset signal-to-noise ratio threshold, the output volume of the target projector is increased until the signal-to-noise ratio reaches the preset signal-to-noise ratio threshold or the output volume reaches a maximum value.

6. The method according to claim 1, characterized in that After the step of matching the corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: Dividing different projection environments where the target projector is located into different viewing scenes; Recording the audio settings of the target projector in different movie-watching scenes, wherein the audio settings are the audio settings with the highest frequency of use and the longest duration, and obtaining a movie-watching scene audio setting mapping table; Identify the current projection environment to obtain the current viewing scene, and match the current audio setting corresponding to the current viewing scene in the viewing scene audio setting mapping table; An output sound curve of the target projector is adjusted based on the current audio setting.

7. The method according to claim 1, characterized in that After the step of matching the corresponding preset sound curve based on the third preset distance and adjusting the output sound curve of the target projector according to the preset sound curve, the method further includes: Acquire the real-time status of the target microphone connected to the target projector; If the audio information in the target microphone is received, the output volume of the target projector is reduced to a preset volume threshold.

8. An LCD projector, characterized in that: The LCD projector comprises: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code comprises computer instructions, and the one or more processors call the computer instructions to make the LCD projector execute the method as described in any one of claims 1-7.

9. A computer-readable storage medium comprising instructions, characterized in that: When the instructions are executed on an LCD projector, the LCD projector is caused to execute the method according to any one of claims 1 to 7.

10. A computer program product, characterized in that When the computer program product is run on an LCD projector, the LCD projector is enabled to execute the method according to any one of claims 1 to 7.

Images