Zoom video volume adjustment method, device and video shooting equipment

Abstract

The present disclosure provides a method for adjusting the volume of a zoom video. During the process of video acquisition by a video acquisition device, a first imaging distance between the video acquisition device and the object to be photographed is detected; if the video acquisition device adjusts the zoom factor, a second imaging distance is determined according to the zoom factor; the recording power of the microphone is determined and adjusted according to the first distance and the second distance; during the video shooting process, when the distance to the object to be photographed changes, the recording power of the microphone also changes accordingly, that is, the volume of the sound recorded in the direction of the position of the object to be photographed also changes accordingly, so as to achieve synchronous zooming of the video image and sound, so that the sound in the captured video is more realistic, more in line with the real scene of the human eye and human ear, and the video effect is more realistic. The present disclosure also provides a volume adjustment device and a video shooting device.

Description

Technical Field

[0001] The present disclosure relates to the field of signal processing technology, and in particular to a method and device for adjusting the volume of a zoom video, and a video shooting device. Background Art

[0002] As the shooting functions of mobile smart terminals become increasingly powerful, using mobile phones, sports cameras and other devices to shoot videos has become the main way for people to record videos. Mobile smart terminals can achieve video zoom, but the sound is not zoomed when the image is zoomed. When taking pictures, the distance between the subject and the camera is changed by zooming, which is a visual zoom. When shooting videos, visual zoom is currently achieved through optical zoom or digital zoom technology, while the audio does not change synchronously. In this way, the visual picture is zoomed in and out, but the sound does not change, making the sound feel unreal. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present disclosure provides a method, a device and a video shooting device for adjusting the volume of a zoom video.

[0004] In a first aspect, an embodiment of the present disclosure provides a method for adjusting the volume of a zoom video, comprising:

[0005] During the process of the video acquisition device acquiring a video, detecting a first imaging distance between the video acquisition device and the photographed object;

[0006] If the video acquisition device adjusts the zoom factor, determining the second imaging distance according to the zoom factor;

[0007] The recording power of the microphone is determined and adjusted according to the first distance and the second distance.

[0008] In some embodiments, after adjusting the receiving and recording power of the microphone, the method further includes:

[0009] Obtaining a first loudness of the sound in the direction of the position of the photographed object;

[0010] A second loudness is determined according to the first loudness, the first distance, and the second distance, so as to adjust the output volume of the speaker according to the second loudness.

[0011] In some embodiments, if the second distance is smaller than the first distance, the recording power of the microphone increases; if the second distance is larger than the first distance, the recording power of the microphone decreases.

[0012] In some embodiments, after determining the second imaging distance according to the zoom factor, the method further includes:

[0013] Calculating noise reduction power according to the first distance and the second distance;

[0014] The noise reduction power of the microphone is adjusted according to the noise reduction power.

[0015] In some embodiments, if the second distance is smaller than the first distance, the noise reduction power is increased; if the second distance is larger than the first distance, the noise reduction power is decreased.

[0016] In another aspect, the present disclosure also provides a volume adjustment device, comprising:

[0017] A detection module, a processing module and an adjustment module, wherein the detection module is used to detect a first imaging distance between the video acquisition device and the photographed object during the process of the video acquisition device acquiring a video;

[0018] The processing module is used to, when the video acquisition device adjusts the zoom factor, determine the second imaging distance according to the zoom factor; and determine the recording power of the microphone according to the first distance and the second distance;

[0019] The adjustment module is used to adjust the receiving and recording power of the microphone.

[0020] In some embodiments, the volume adjustment device further includes an acquisition module, the acquisition module being used to acquire a first loudness of the sound in the direction of the position of the photographed object after the adjustment module adjusts the receiving and recording power of the microphone;

[0021] The processing module is further configured to determine a second loudness according to the first loudness, the first distance, and the second distance;

[0022] The adjustment module is further configured to adjust the output volume of the speaker according to the second loudness.

[0023] In some embodiments, when the second distance is smaller than the first distance, the recording power of the microphone increases; when the second distance is larger than the first distance, the recording power of the microphone decreases.

[0024] In some embodiments, the processing module is further configured to, after determining a second imaging distance according to the zoom factor, calculate a noise reduction power according to the first distance and the second distance;

[0025] The adjustment module is further configured to adjust the noise reduction power of the microphone according to the noise reduction power.

[0026] In some embodiments, when the second distance is smaller than the first distance, the noise reduction power increases; and when the second distance is larger than the first distance, the noise reduction power decreases.

[0027] On the other hand, an embodiment of the present disclosure further provides a video shooting device, including a video acquisition device, a microphone, and the volume adjustment device as described above.

[0028] In some embodiments, there are two microphones, and the distances between the two microphones and the subject are equal.

[0029] In some embodiments, at least one of the two microphones is a unidirectional microphone.

[0030] In some embodiments, the video capture device also includes a speaker.

[0031] The volume adjustment method, device and video shooting equipment for zoom video provided by the embodiments of the present disclosure detect the first imaging distance between the video acquisition device and the shooting object during the process of the video acquisition device capturing the video; if the video acquisition device adjusts the zoom factor, the second imaging distance is determined according to the zoom factor; the sound receiving power of the microphone is determined and adjusted according to the first distance and the second distance; during the video shooting process, when the distance to the shooting object changes, the sound receiving power of the microphone also changes accordingly, that is, the volume of the sound recorded in the direction of the shooting object also changes accordingly, so as to realize synchronous zooming of the video image and sound, so that the sound in the captured video is more realistic, more in line with the actual scene of the human eye and human ear, and the video effect is more realistic. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is one of the schematic diagrams of the zoom video volume adjustment process provided by the embodiment of the present disclosure;

[0033] Figure 2 The second schematic diagram of the zoom video volume adjustment process provided by the embodiment of the present disclosure;

[0034] Figure 3 The third schematic diagram of the zoom video volume adjustment process provided by the embodiment of the present disclosure;

[0035] Figure 4 One of the structural schematic diagrams of the volume adjustment device provided in the embodiment of the present disclosure;

[0036] Figure 5 A second structural diagram of the volume adjustment device provided in an embodiment of the present disclosure;

[0037] Figure 6 A schematic diagram of the structure of a video shooting device provided in an embodiment of the present disclosure;

[0038] Figure 7 A schematic diagram of a working scenario of a video shooting device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0040] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0042] The embodiments described herein may be described with reference to plan views and / or cross-sectional views by means of idealized schematic diagrams of the present disclosure. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances. Therefore, the embodiments are not limited to the embodiments shown in the accompanying drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the accompanying drawings have schematic properties, and the shapes of the regions shown in the figures illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0043] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.

[0044] The present disclosure provides a method for adjusting the volume of a zoom video. Figure 1 As shown, the zoom video volume adjustment method includes the following steps:

[0045] Step 11: During the process of the video acquisition device acquiring a video, a first imaging distance between the video acquisition device and the photographed object is detected.

[0046] In this step, the distance sensor and the camera imaging system can be used to accurately measure the first imaging distance between the video acquisition device (ie, the camera of the video shooting device) and the shooting object, and the first distance is the actual distance.

[0047] Step 12: If the video acquisition device adjusts the zoom factor, determine the second imaging distance according to the zoom factor.

[0048] In the disclosed embodiment, a plurality of zoom factors are preset in the video capture device. When capturing a video using the video capture device, if the user wants to use the camera to zoom in or out of the subject, the camera can be adjusted according to the preset zoom factors.

[0049] Regardless of whether it is digital zoom or optical zoom, the imaging distance of the subject will change after zooming. When the subject is brought closer, the imaging distance of the subject becomes smaller, and the distance between the subject displayed on the screen and the camera becomes smaller. When the subject is moved farther away, the imaging distance of the subject becomes larger, and the distance between the subject displayed on the screen and the camera becomes larger. Regardless of whether it is optical zoom or digital zoom, there is a fixed relationship between the zoom factor and the imaging distance. Based on the fixed relationship between the zoom factor and the imaging distance, the imaging distance (i.e., the second distance) of the subject at the current zoom factor can be calculated.

[0050] Step 13: determine and adjust the recording power of the microphone according to the first distance and the second distance.

[0051] The recording power of the microphone determines the volume of the sound of the subject recorded in the video. The greater the recording power of the microphone, the greater the volume of the sound of the subject recorded in the video, and the smaller the recording power of the microphone, the smaller the volume of the sound of the subject recorded in the video. Therefore, by adjusting the recording power of the microphone, the volume of the sound in the video can be adjusted.

[0052] In this step, if the second distance is smaller than the first distance, the microphone's receiving and recording power is increased; if the second distance is larger than the first distance, the microphone's receiving and recording power is reduced. That is, when the camera zooms in on the subject, the zoom factor increases, the imaging distance decreases (i.e., the second distance is smaller than the first distance), and the microphone's receiving and recording power is increased accordingly to increase the sound volume of the subject in the video; when the camera zooms out on the subject, the zoom factor decreases, the imaging distance increases (i.e., the second distance is larger than the first distance), and the microphone's receiving and recording power is reduced accordingly to reduce the sound volume in the direction of the subject's position in the video.

[0053] The zoom video volume adjustment method provided by the embodiment of the present disclosure detects a first imaging distance between the video acquisition device and the photographed object during the process of the video acquisition device capturing the video; if the video acquisition device adjusts the zoom factor, determines a second imaging distance according to the zoom factor; determines and adjusts the sound receiving power of the microphone according to the first distance and the second distance; during the video shooting process, when the distance to the photographed object changes, the sound receiving power of the microphone also changes accordingly, that is, the volume of the sound recorded in the direction of the position of the photographed object also changes accordingly, so as to realize synchronous zoom of the video image and sound, so that the sound in the captured video is more realistic, more in line with the actual scene of the human eye and human ear, and the video effect is more realistic.

[0054] By adjusting the receiving and recording power of the microphone, the sound volume of the input end of the video can be adjusted to achieve the effect of synchronous zooming of the video image and sound. However, by adjusting the receiving and recording power of the microphone, the sound volume in the video can only be adjusted within a rough range, and the sound volume cannot be accurately controlled.

[0055] In order to solve the above problem, in some embodiments, the output volume of the speaker can be further adjusted based on adjusting the recording power of the microphone. Figure 2 As shown, after adjusting the recording power of the microphone (i.e., step 13), the zoom video volume adjustment method may further include the following steps:

[0056] Step 21, obtaining the first loudness of the sound in the direction where the photographed object is located.

[0057] Loudness, also known as volume, refers to the strength of sound perceived by the human ear. In this step, a microphone is pointed at the subject to collect sound in the direction of the subject to obtain a first loudness of the sound, which is the loudness of the sound obtained by the microphone under the adjusted recording power.

[0058] Step 22: determining a second loudness according to the first loudness, the first distance, and the second distance, so as to adjust the output volume of the speaker according to the second loudness.

[0059] The second loudness is proportional to the square of the ratio of the first distance to the second distance, and is related to the first loudness, that is, the second loudness is based on the first loudness and is adjusted according to the adjustment amount determined by the first distance and the second distance. There are many ways to implement determining the second loudness according to the first loudness, the first distance and the second distance, which are not limited in the embodiments of the present disclosure.

[0060] The video shooting device may also include a speaker (i.e., a loudspeaker) for playing the sound in the video. Accordingly, when playing the video, the output volume of the speaker is adjusted to the calculated second loudness, so as to achieve accurate adjustment of the sound volume in the direction of the position of the shooting object in the video. Since the second loudness takes into account the actual volume (i.e., the first loudness), the obtained output volume is more in line with the actual situation, and the sound volume at the output end of the video can be adjusted.

[0061] In order to improve the sound quality in the captured video and reduce the environmental noise, in some embodiments, the microphone can be a microphone with a noise reduction function, and accordingly, the noise reduction power of the microphone with the noise reduction function can also be adjusted.

[0062] In some embodiments, Figure 3 As shown, after determining the second imaging distance according to the zoom factor (i.e., step 12), the zoom video volume adjustment method may further include the following steps:

[0063] Step 31: Calculate the noise reduction power according to the first distance and the second distance.

[0064] It should be noted that the noise reduction power is the noise reduction power in directions other than the direction toward the photographed object, that is, the noise reduction power of the ambient noise.

[0065] Step 32: adjust the noise reduction power of the microphone according to the noise reduction power.

[0066] In some embodiments, if the second distance is smaller than the first distance, the noise reduction power increases; if the second distance is larger than the first distance, the noise reduction power decreases. That is, when the camera zooms in on the subject, the zoom factor increases, the imaging distance decreases (i.e., the second distance is smaller than the first distance), and the noise reduction power of the microphone can be increased accordingly to increase the power of removing ambient noise; when the camera zooms out on the subject, the zoom factor decreases, the imaging distance increases (i.e., the second distance is larger than the first distance), and the noise reduction power of the microphone can be reduced accordingly to reduce the power of removing ambient noise.

[0067] Based on the same technical concept, the embodiment of the present disclosure also provides a volume adjustment device, such as Figure 4 As shown, the volume adjustment device includes a detection module 101, a processing module 102 and an adjustment module 103. The detection module 101 is used to detect a first imaging distance between the video acquisition device and a photographed object during the process of the video acquisition device acquiring a video.

[0068] The processing module 102 is used to determine the zoom factor when the video acquisition device is zoomed, and determine the second imaging distance according to the zoom factor; and determine the recording power of the microphone according to the first distance and the second distance.

[0069] The adjustment module 103 is used to adjust the receiving and recording power of the microphone.

[0070] In some embodiments, Figure 5 As shown, the volume adjustment device further includes an acquisition module 104, and the acquisition module 104 is used to obtain a first loudness of the sound of the photographed object after the adjustment module adjusts the receiving and recording power of the microphone.

[0071] The processing module 102 is further configured to determine a second loudness according to the first loudness, the first distance, and the second distance.

[0072] The adjustment module 103 is further configured to adjust the output volume of the speaker according to the second loudness.

[0073] In some embodiments, the processing module 102 is configured to increase the recording power of the microphone when the second distance is smaller than the first distance; and to reduce the recording power of the microphone when the second distance is larger than the first distance.

[0074] In some embodiments, the processing module 102 is further configured to, after determining a second imaging distance according to the zoom factor, calculate a noise reduction power according to the first distance and the second distance.

[0075] The adjustment module 103 is further configured to adjust the noise reduction power of the microphone according to the noise reduction power.

[0076] In some embodiments, when the second distance is smaller than the first distance, the noise reduction power increases; and when the second distance is larger than the first distance, the noise reduction power decreases.

[0077] Based on the same technical concept, the embodiment of the present disclosure also provides a video shooting device, such as Figure 6 As shown, it includes a video acquisition device 1, a microphone 2 and a volume adjustment device (not shown in the figure), wherein the volume adjustment device can be the volume adjustment device as described above. The video acquisition device 1 can be a camera for video acquisition; the microphone 2 is used to obtain audio signals, that is, to pick up sound. The video shooting device can be an intelligent mobile device, such as a video camera, a camera, a smart phone, an electronic monitoring device, etc.

[0078] In some embodiments, there are two microphones 2 to achieve dual-microphone noise reduction.

[0079] In some embodiments, at least one of the two microphones 2 is a unidirectional microphone. The use of a unidirectional microphone can specifically pick up the sound of the shooting object, and the sound pickup effect is better.

[0080] In some embodiments, the video capture device may further include a speaker (not shown in the figure). Accordingly, the volume adjustment device may also obtain a first loudness of the sound of the captured object, determine a second loudness according to the first loudness, the first distance and the second distance, and adjust the output volume of the speaker according to the second loudness, thereby achieving adjustment of the sound volume of the output end of the video.

[0081] The video shooting device provided by the embodiment of the present disclosure has a distance sensor under the camera to facilitate the detection of the first imaging distance between the camera and the object; a microphone 2 with a noise reduction function is placed above and below the camera, and the noise reduction function can be used to shield the surrounding noisy sounds. The microphone 2 can use a unidirectional microphone to record the sound in a specified direction. This group of microphones can adjust the power of the recorded sound. When other conditions remain unchanged, if the recording power and the noise reduction power in other directions are increased, the loudness of the recorded sound can be increased; when other conditions remain unchanged, if only the recording power and the noise reduction power in other directions are reduced, the loudness of the recorded sound can be reduced. The size of the microphone's sound recording power is adjusted according to the zoom multiple of the camera. When the camera is pulled closer to the object, the microphone's sound recording power becomes larger, and the noise reduction power in other directions is increased; when the camera is pulled away from the object, the microphone's sound recording power becomes smaller, and the noise reduction power in other directions is reduced.

[0082] In order to clearly illustrate the technical solution of the embodiment of the present disclosure, the following Figure 7 , the working process of the video shooting equipment is explained in detail.

[0083] like Figure 7 As shown, when the video acquisition device 1 (i.e., the camera) starts to shoot a video, the distance sensor (i.e., the detection module of the volume adjustment device) detects the first distance from the image of the shooting object, and the microphone 2 records the sound directly in front of the camera and performs noise reduction processing. When the zoom starts, the volume adjustment device will determine and adjust the size of the sound power recorded by the microphone 2 and the size of the noise reduction power after the image is zoomed according to the zoom situation. In this way, when the shooting object is zoomed in, the microphone's recording power and the noise reduction power in other directions are increased, and the loudness of the recorded sound becomes louder; when the shooting object is pulled away, the microphone's recording power and the noise reduction power in other directions are reduced, and the loudness of the recorded sound becomes smaller. That is, physically, the microphone's recording power is dynamically adjusted with the camera zoom multiple, and the sound level of the audio input is also dynamically adjusted with the camera zoom multiple, and finally the synchronous zoom of the image and sound is achieved.

[0084] The disclosed embodiments achieve audio zoom while performing visual zoom in recorded video based on the mathematical relationship between sound loudness and propagation distance, and utilize a distance sensor and a camera imaging system to measure the actual distance between an object in an image and a shooting position. For imaging distances between the object in the image and the shooting position at different zoom factors, the power of the sound recorded by the microphone is controlled according to changes in the imaging distance, thereby achieving audio zoom.

[0085] One of the application scenarios of the disclosed embodiment is: a camera on the street (such as a public security camera) captures many people. When the camera is zoomed in, the image of a certain person is magnified. At this time, the microphone will increase the recording power in the direction of the person's location, thereby increasing the sound recorded by the person, achieving the effect of amplifying the person's voice.

[0086] It will be appreciated by those skilled in the art that all or some of the steps in the method disclosed above, the functional modules / units in the device may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0087] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly stated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A zoom video volume adjustment method, characterized in that: The method comprises: During the process of the video acquisition device acquiring a video, detecting a first imaging distance between the video acquisition device and the photographed object; If the video acquisition device adjusts the zoom factor, determining the second imaging distance according to the zoom factor; determining and adjusting the recording power of the microphone according to the first distance and the second distance, After adjusting the receiving and recording power of the microphone, the method further includes: Acquire a first loudness of the sound in the direction of the position of the photographed object, where the first loudness is the loudness of the sound acquired at the recording power after the microphone is adjusted; A second loudness is determined according to the first loudness, the first distance, and the second distance, so as to adjust the output volume of the speaker according to the second loudness.

2. The method according to claim 1, characterized in that The determining and adjusting the recording power of the microphone according to the first distance and the second distance includes: If the second distance is smaller than the first distance, increasing the recording power of the microphone; If the second distance is greater than the first distance, the recording power of the microphone is reduced.

3. The method according to any one of claims 1 to 2, characterized in that: After determining the second imaging distance according to the zoom factor, the method further includes: Calculating noise reduction power according to the first distance and the second distance; The noise reduction power of the microphone is adjusted according to the noise reduction power.

4. The method according to claim 3, characterized in that If the second distance is smaller than the first distance, the noise reduction power is increased; if the second distance is larger than the first distance, the noise reduction power is decreased.

5. A volume adjustment device, characterized in that: include: A detection module, a processing module, an adjustment module and an acquisition module, wherein the detection module is used to detect a first imaging distance between the video acquisition device and a photographed object during the process of the video acquisition device acquiring a video; The processing module is used to, when the video acquisition device adjusts the zoom factor, determine the second imaging distance according to the zoom factor; and determine the recording power of the microphone according to the first distance and the second distance; The adjustment module is used to adjust the receiving and recording power of the microphone; The acquisition module is used to acquire a first loudness of the sound in the direction of the position of the photographed object after the adjustment module adjusts the receiving and recording power of the microphone, wherein the first loudness is the loudness of the sound acquired at the receiving and recording power after the microphone is adjusted; The processing module is further configured to determine a second loudness according to the first loudness, the first distance, and the second distance; The adjustment module is further configured to adjust the output volume of the speaker according to the second loudness.

6. The volume control device according to claim 5, characterized in that: When the second distance is smaller than the first distance, the recording power of the microphone increases; when the second distance is larger than the first distance, the recording power of the microphone decreases.

7. The volume adjustment device according to any one of claims 5 to 6, characterized in that: The processing module is further configured to, after determining a second imaging distance according to the zoom factor, calculate a noise reduction power according to the first distance and the second distance; The adjustment module is further configured to adjust the noise reduction power of the microphone according to the noise reduction power.

8. The volume control device according to claim 7, characterized in that: When the second distance is smaller than the first distance, the noise reduction power increases; when the second distance is larger than the first distance, the noise reduction power decreases.

9. A video shooting device, characterized in that: The device comprises a video acquisition device, a microphone and a volume adjustment device as described in any one of claims 5 to 8.

10. The video capture device according to claim 9, characterized in that: There are two microphones.

11. The video capture device according to claim 10, wherein: At least one of the two microphones is a unidirectional microphone.

12. The video shooting device according to any one of claims 9 to 11, characterized in that: It also includes a speaker, and the volume adjustment device is the volume adjustment device as claimed in claim 5.

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