CN104244137A - Method and system for improving long-shot recording effect during videoing - Google Patents

Abstract

The invention discloses a method for improving the recording effect of distant scenes in the video recording process, which is applied to an intelligent mobile terminal with camera and recording functions. Range relationship mapping table; S2. The smart mobile terminal enters the camera recording application, and calculates the camera object distance D according to the camera focal length and image distance during the shooting zoom process; S3. Searches for the relationship mapping according to the camera object distance D of the smart mobile terminal Table, get the best pickup range of the microphone, and then change the directivity of the microphone by adjusting the circuit and structural parameters of the microphone according to the pickup range of the microphone. The present invention overcomes the stubborn problem that the microphone pickup range in the existing intelligent mobile terminal is not variable, and proposes a method for intelligently adjusting the directivity of the microphone pickup range, and controls the length parameter of the interference tube through the voice coil motor to adjust the pickup range, thereby realizing The purpose of recording high-quality distant sound.

Description

A method and system for improving the effect of distant scene recording in the process of video recording

technical field

The invention relates to the technical field of intelligent mobile terminal applications, in particular to a method and a system for improving the effect of distant scene recording during video recording.

Background technique

With the rapid development of digital technology in the past 20 to 30 years, it has become a fashion for people to record every bit of life by taking pictures. Nowadays, there are more and more electronic devices that can be used for taking pictures, such as mobile phones, digital Cameras, PDAs, etc. Shooting video is one of the important applications of smart mobile terminals. During the specific shooting process, the photographer may need to frequently switch between the distant view and the close view, so as to capture the scene images that the user is most interested in. In the process of shooting scene images, the microphone starts to record sound, but there is a prominent application problem in the prior art that the directivity of the microphone recording on the smart mobile terminal is immutable, and the corresponding sound pickup range is permanently fixed. If the user sets the focal length of the camera at a relatively far place, it will be difficult for the microphone to record the sound there, or even if the sound can be recorded, it must be mixed with a lot of noise. There is an urgent need to propose a method that can automatically adjust the directivity of the microphone by monitoring the lens focusing action, so that the sound in the near view can be suppressed as much as possible when shooting in the distant view, and the sound in the distant view can be recorded with better quality, so as to solve the unsatisfactory recording effect in the distant view. purpose of technical issues.

Contents of the invention

The first purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a method for improving the effect of distant scene recording during video recording. The invention of this method uses the principle of sound wave interference of the interference tube to make a microphone with adjustable directivity. When shooting a video, the directivity of the microphone is automatically adjusted with the adjustment of the focal length of the camera. When the focal length is far away, adjust the directivity of the microphone to make it sharper, increase the sensitivity to the sound source at the focal point, and weaken the surrounding noise, so that the sound that the photographer is most interested in can be recorded to solve the unsatisfactory recording effect of the distant scene technical problems.

Another object of the present invention is to overcome the disadvantages and deficiencies of the prior art, and provide a system for improving the effect of distant scene recording during video recording.

First purpose of the present invention is achieved through the following technical solutions:

A method for improving the effect of distant scene recording during video recording, which is applied to an intelligent mobile terminal with camera and recording functions, comprising the following steps:

S1. Establish a relationship mapping table, the relationship mapping table records the corresponding relationship between the camera object distance D of the intelligent mobile terminal and the optimal sound pickup range of the microphone;

S2. The smart mobile terminal enters the camera recording application, and finally calculates the camera object distance D, which is the distance from the smart mobile terminal to the focus point, according to the focal length and image distance of the camera during the zooming process;

S3. According to the camera object distance D of the smart mobile terminal, search the relationship mapping table to obtain the best sound pickup range of the microphone, and then change the directivity of the microphone according to the sound pickup range of the microphone and by adjusting the circuit and structural parameters of the microphone to realize Record high-quality vista sounds.

Preferably, the microphone is an interference tube microphone, wherein the interference tube microphone uses the principle of sound wave interference to design the pickup range of the microphone into a supercardioid by opening a hole in the interference tube, and then adjusts the length L of the interference tube , you can adjust the directivity of the supercardioid pickup range of the microphone. The larger the length L of the interference tube, the sharper the directivity.

Preferably, the length L of the interference tube is adjusted by a VCM (Voice Coil Motor). Changing the direction of the current can control the expansion and contraction of the interference tube, thereby changing the length L of the interference tube.

Preferably, the microphone and the camera are arranged in the same direction of the smart mobile terminal, that is, the shooting direction of the camera is consistent with the sound pickup direction of the microphone.

Preferably, the corresponding relationship between the camera object distance D of the smart mobile terminal and the optimum sound pickup range of the microphone recorded in the relationship mapping table in step S1 is obtained through prior experimental tests and stored in the associated folder of the application.

Preferably, the intelligent mobile terminals include mobile phones, tablet computers and palm Internet devices.

Another object of the present invention is achieved through the following technical solutions:

A system for improving the effect of remote recording during video recording, which is applied to an intelligent mobile terminal with camera and recording functions, and includes the following devices:

A relationship mapping table establishment device, which is used to establish a relationship mapping table, and the relationship mapping table records the corresponding relationship between the camera object distance D of the intelligent mobile terminal and the optimal sound pickup range of the microphone;

The camera object distance calculation device, which is used for the smart mobile terminal to enter the camera recording application, and finally calculates the camera object distance D according to the focal length and image distance of the camera during the zooming process, that is, the distance between the smart mobile terminal and the focus point;

Microphone pick-up range adjustment device, the device looks up the relationship mapping table according to the camera-object distance D of the smart mobile terminal, obtains the best pick-up range of the microphone, and then changes the circuit and structural parameters of the microphone according to the pick-up range of the microphone. The directivity of the microphone realizes the recording of high-quality distant sound.

Preferably, the microphone is an interference tube microphone, wherein the interference tube microphone uses the principle of sound wave interference to design the pickup range of the microphone into a supercardioid by opening a hole in the interference tube, and then adjusts the length L of the interference tube , you can adjust the directivity of the supercardioid pickup range of the microphone. The larger the length L of the interference tube, the sharper the directivity.

Preferably, the length L of the interference tube of the microphone is adjusted by a VCM (Voice CoilMotor) voice coil motor. The specific realization principle is that the interference tube is wound on the coil, and then the interference tube is placed in the magnetic field of the permanent magnet, and the coil is energized. The expansion and contraction of the interference tube can be controlled by changing the direction of the current, thereby changing the length L of the interference tube.

Preferably, the microphone and the camera are arranged in the same direction of the smart mobile terminal, that is, the shooting direction of the camera is consistent with the sound pickup direction of the microphone.

Preferably, the corresponding relationship between the camera object distance D of the intelligent mobile terminal recorded in the relationship mapping table and the optimum sound pickup range of the microphone in the relationship mapping table establishment device is obtained through prior experimental tests, and is stored in the associated folder of the application middle.

Preferably, the intelligent mobile terminals include mobile phones, tablet computers and palm Internet devices.

Compared with the prior art, the present invention has the following advantages and effects:

(1) The present invention overcomes the stubborn problem that the microphone pickup range in the existing smart mobile terminal is invariable, and proposes a method for controlling a microphone with adjustable pickup range directivity, by controlling the length L parameter of the microphone interference tube through a voice coil motor, Adjusting the sound pickup range achieves the purpose of recording high-quality distant sound.

(2) The present invention first obtains the optimal combination relationship of the focal length of the camera and the directivity of the microphone pickup range through the preliminary test, and writes it into the program memory of the smart mobile terminal, so that the adjustment of the directivity of the microphone is completely automatic No manual control input is required.

Description of drawings

Fig. 1 is a flow chart of a method for improving the effect of distant scene recording in the video recording process in the first embodiment;

Fig. 2 is the structural diagram of the pickup range of the supercardioid microphone in the present embodiment one;

Fig. 3 is the structural diagram of the interference tube microphone in the first embodiment;

Fig. 4 is the structural diagram of the pickup range of the interference tube microphone in the first embodiment;

FIG. 5 is a structure diagram of an interference tube microphone with a voice coil motor structure for adjusting the length of the interference tube in the first embodiment.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Embodiment one

Please refer to FIG. 1 . FIG. 1 is a flow chart of a method for improving the effect of distant scene recording in the video recording process in the first embodiment. A method for improving the recording effect of the remote scene in the video recording process shown in FIG. 1 is applied to an intelligent mobile terminal with camera and recording functions, and the intelligent mobile terminal includes a mobile phone, a tablet computer, a handheld Internet device, and the like.

There are many types of microphone pickup types, such as omnidirectional microphone, cardioid, figure 8, supercardioid, etc. The difference between them is that they have different sensitivities to sounds from different directions. Simply put, it is the ability of a microphone to "pick up" sound from a particular direction. The directivity of the microphone can be adjusted by adjusting the internal structure and circuit of the microphone. If the microphone is pointed in a certain direction, the sound in this direction can be picked up well, while the sound in other directions will be ignored. And the sharper the directivity, the better the pickup effect.

Figure 2 shows the sound pickup range of the supercardioid microphone, and the solid line area in the figure is the best sound pickup range. By adjusting the circuit and structural parameters, the heart shape can be made sharper. The supercardioid microphone has a very narrow pick-up range, and the directivity effect is very obvious. It is very sensitive to sounds in the direct direction of the microphone sound inlet, and very insensitive to sounds that deviate from the direct direction. This microphone is ideal for picking up sounds of interest to users in noisy environments while effectively suppressing surrounding noise.

During the shooting and zooming process, the system can finally calculate the object distance according to the focal length and image distance of the camera, that is, the distance from the mobile phone to the focus point. If the distance becomes larger, adjust the microphone directivity to make the cardioid sharper, and the sound at the focus can be recorded more clearly, otherwise, the cardioid will be blunted.

The structural diagram of the interference tube microphone is shown in Figure 3. It can be seen from Figure 3 that its structural feature is to open holes in the interference tube and use the principle of sound wave interference to design a supercardioid microphone. When the sound wave is incident at an angle of 0°, the path of each sound wave signal to the diaphragm is the same, and the vibration is the largest; when it is incident at a certain angle θ, there is a phase difference when each signal reaches the diaphragm. According to the principle of interference, the final vibration will be weakened. sonic energy. By adjusting the length L of the interference tube, the directivity of the microphone can be adjusted. The longer the length L of the interference tube, the sharper the directivity. The sound pickup range is shown in Figure 4. It can be clearly seen from Figure 4 that this microphone is very sensitive to sound waves within a narrow range at the front of the MIC, and the sensitivity drops sharply beyond this range.

As shown in Figure 5, there is a structural diagram of an interference tube microphone with a voice coil motor structure for adjusting the length of the interference tube. It can be seen from Figure 5 that the length L of the interference tube is adjusted by a VCM (Voice CoilMotor) voice coil motor. The interference tube is made into a two-section structure, as shown in Figure 5, in which the section with the sound cavity can move. Wind the interference tube with a coil, place the interference tube in the magnetic field of a permanent magnet, and energize the coil. By changing the direction of the current, the expansion and contraction of the interference tube can be controlled, thereby changing the length L of the interference tube.

A method for improving the effect of distant scene recording in a video recording process shown in Fig. 1, specifically comprises the following steps:

Step S1, establishing a relationship mapping table, the relationship mapping table records the corresponding relationship between the camera object distance D of the smart mobile terminal and the optimum sound pickup range of the microphone.

Wherein, the corresponding relationship between the camera object distance D of the smart mobile terminal and the optimum sound pickup range of the microphone recorded in the relationship mapping table is obtained through prior experimental tests and stored in the associated folder of the application.

Step S2, the smart mobile terminal enters the camera recording application, and finally calculates the camera object distance D, which is the distance from the smart mobile terminal to the focus point, according to the focal length and image distance of the camera during the zooming process.

Step S3, according to the camera object distance D of the smart mobile terminal, look up the relationship mapping table to obtain the best sound pickup range of the microphone, and then change the directivity of the microphone by adjusting the circuit and structural parameters of the microphone according to the sound pickup range of the microphone, Realize the recording of high-quality distant sound.

The microphone described in step S3 of the first embodiment of this embodiment is an interference tube microphone, wherein the interference tube microphone uses the principle of sound wave interference to design the sound pickup range of the microphone into a supercardioid shape by opening a hole in the interference tube, and then adjusts the interference The length L of the tube can adjust the directivity of the supercardioid pickup range of the microphone. The larger the length L of the interference tube, the sharper the directivity.

The length L of the interference tube is adjusted by a VCM (Voice Coil Motor) voice coil motor. The specific realization principle is to wind the interference tube on a coil, then place the interference tube in the magnetic field of a permanent magnet, energize the coil, and change the direction of the current. The expansion and contraction of the interference tube is controlled, thereby changing the length L of the interference tube.

It should be emphasized that in this embodiment, the microphone and the camera are arranged in the same direction of the smart mobile terminal, that is, the shooting direction of the camera is consistent with the sound pickup direction of the microphone.

Embodiment two

This embodiment discloses a system for enhancing the recording effect of distant scenes during the video recording process, which is applied to an intelligent mobile terminal with camera and recording functions, and the intelligent mobile terminal includes a mobile phone, a tablet computer, and a palm Internet device.

The system specifically includes the following devices:

1. A device for establishing a relational mapping table,

The device is used to establish a relationship mapping table, and the relationship mapping table records the corresponding relationship between the camera object distance D of the intelligent mobile terminal and the optimum sound pickup range of the microphone.

The corresponding relationship between the camera object distance D of the smart mobile terminal and the optimum sound pickup range of the microphone recorded in the relationship mapping table is obtained through prior experimental tests, and is stored in the associated folder of the relevant application.

2. Camera object distance calculation device,

The device is used for the smart mobile terminal to enter the camera recording application. During the shooting and zooming process, according to the focal length and image distance of the camera, the camera object distance D is finally calculated, that is, the distance between the smart mobile terminal and the focus point.

3. Microphone pick-up range adjustment device,

According to the camera object distance D of the intelligent mobile terminal, the device searches the relationship mapping table to obtain the best sound pickup range of the microphone, and then changes the directivity of the microphone by adjusting the circuit and structural parameters of the microphone according to the sound pickup range of the microphone to realize recording. High-quality vista sound.

The microphone is an interference tube microphone, wherein the interference tube microphone uses the sound wave interference principle to design the sound pickup range of the microphone into a supercardioid by opening a hole on the interference tube, and then by adjusting the length L of the interference tube, it can Adjust the directivity of the supercardioid pickup range of the microphone, the greater the length L of the interference tube, the sharper the directivity.

The length L of the interference tube of the microphone is adjusted by a VCM (Voice Coil Motor). The expansion and contraction of the interference tube can be controlled, thereby changing the length L of the interference tube. The specific structural diagram is shown in FIG. 5 as the structural diagram of the interference tube microphone with a voice coil motor structure for adjusting the length of the interference tube, that is, the structure of the second embodiment is the same as the structure of the interference tube microphone in the first embodiment.

In the second embodiment, the microphone and the camera are arranged in the same direction of the smart mobile terminal, that is, the shooting direction of the camera is consistent with the sound pickup direction of the microphone.

It is worth noting that in the above system embodiments, the various devices and units included are only divided according to functional logic, but are not limited to the above divisions, as long as the corresponding functions can be realized; in addition, each device and unit The specific names are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present invention.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (12)

1. A method for improving the sound recording effect of a distant view in a video recording process, which is applied in an intelligent mobile terminal with camera and recording functions, is characterized in that, comprising the following steps: S1. Establish a relationship mapping table, the relationship mapping table records the corresponding relationship between the camera object distance D of the intelligent mobile terminal and the optimal sound pickup range of the microphone; S2. The smart mobile terminal enters the camera recording application, and finally calculates the camera object distance D according to the focal length and image distance of the camera during the zooming process, which is the distance from the smart mobile terminal to the focus point; S3. According to the camera object distance D of the smart mobile terminal, search the relationship mapping table to obtain the best sound pickup range of the microphone, and then change the directivity of the microphone according to the sound pickup range of the microphone and by adjusting the circuit and structural parameters of the microphone to realize Record high-quality vista sounds. 2. the method for promoting the distant view recording effect in a kind of video recording process according to claim 1, is characterized in that: The microphone is an interference tube microphone, wherein the interference tube microphone uses the sound wave interference principle to design the sound pickup range of the microphone into a supercardioid by opening a hole on the interference tube, and then by adjusting the length L of the interference tube, it can Adjust the directivity of the supercardioid pickup range of the microphone, the greater the length L of the interference tube, the sharper the directivity. 3. the method for promoting the distant view recording effect in a kind of video recording process according to claim 2, is characterized in that: The length L of the interference tube is adjusted by a VCM (Voice Coil Motor) voice coil motor. The specific realization principle is to wind the interference tube on a coil, then place the interference tube in the magnetic field of a permanent magnet, energize the coil, and change the direction of the current The expansion and contraction of the interference tube can be controlled, thereby changing the length L of the interference tube. 4. the method for promoting the distant view recording effect in a kind of video recording process according to claim 2, is characterized in that: The microphone and the camera are arranged in the same direction of the smart mobile terminal, that is, the shooting direction of the camera is consistent with the sound pickup direction of the microphone. 5. the method for promoting the distant view recording effect in a kind of video recording process according to claim 1, is characterized in that: The corresponding relationship between the camera object distance D of the smart mobile terminal and the optimum sound pickup range of the microphone recorded in the relationship mapping table in step S1 is obtained through prior experimental tests and stored in the associated folder of the application. 6. according to claim 1 to the method for promoting the distant view sound recording effect in a kind of video recording process described in claim 1 to 5, it is characterized in that: The intelligent mobile terminal includes a mobile phone, a tablet computer and a palm Internet device. 7. A system for improving the recording effect of distant views in the video recording process, which is applied in an intelligent mobile terminal with camera and recording functions, and is characterized in that it includes the following devices: A relationship mapping table establishment device, which is used to establish a relationship mapping table, and the relationship mapping table records the corresponding relationship between the camera object distance D of the intelligent mobile terminal and the optimal sound pickup range of the microphone; The camera object distance calculation device, which is used for the smart mobile terminal to enter the camera recording application, and finally calculates the camera object distance D according to the focal length and image distance of the camera during the zooming process, that is, the distance between the smart mobile terminal and the focus point; Microphone pick-up range adjustment device, the device looks up the relationship mapping table according to the camera-object distance D of the smart mobile terminal, obtains the best pick-up range of the microphone, and then changes the circuit and structural parameters of the microphone according to the pick-up range of the microphone. The directivity of the microphone realizes the recording of high-quality distant sound. 8. a kind of system according to claim 7 promotes the system of distant scene recording effect in video recording process, it is characterized in that: The microphone is an interference tube microphone, wherein the interference tube microphone uses the sound wave interference principle to design the sound pickup range of the microphone into a supercardioid by opening a hole on the interference tube, and then by adjusting the length L of the interference tube, it can Adjust the directivity of the supercardioid pickup range of the microphone, the greater the length L of the interference tube, the sharper the directivity. 9. The system for enhancing the distant view recording effect in a video recording process according to claim 8, characterized in that: The length L of the interference tube of the microphone is adjusted by a VCM (Voice Coil Motor). The direction can control the expansion and contraction of the interference tube, thereby changing the length L of the interference tube. 10. The system for enhancing the distant view recording effect in a video recording process according to claim 8, characterized in that: The microphone and the camera are arranged in the same direction of the smart mobile terminal, that is, the shooting direction of the camera is consistent with the sound pickup direction of the microphone. 11. a kind of system according to claim 7 in the video recording process of promoting distant view recording effect, is characterized in that: The corresponding relationship between the camera object distance D of the intelligent mobile terminal and the optimum sound pickup range of the microphone recorded in the relationship mapping table in the relationship mapping table establishment device is obtained through prior experimental tests and stored in the associated folder of the application. 12. The system for enhancing the effect of remote recording in a video recording process according to claims 7 to 11, characterized in that: The intelligent mobile terminal includes a mobile phone, a tablet computer and a palm Internet device.