Image pickup sound extracting method and device

An extraction method and sound technology, applied in the field of communication, can solve problems such as large differences in sound intensity, and achieve the effect of eliminating the influence of sound intensity, reducing the influence of ambient noise, and improving user experience.

Inactive Publication Date: 2013-03-13
DONGGUAN YULONG COMM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Provided is a method and device for extracting sound from a camera, which can solve the problem of great difference in sound intensity caused by the difference in the distance between the narrator and the subject from the microphone during the video recording process, and clearly play the commentary sound and the sound of the subject separately out, and reduce the impact of interfering sources

Method used

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  • Image pickup sound extracting method and device
  • Image pickup sound extracting method and device

Examples

Experimental program
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Embodiment 1

[0039] This embodiment provides a method for extracting camera sound, such as figure 1 As shown, the method includes:

[0040] 101. Obtain the initial sound signal v obtained by the first microphone F (t) and the initial sound signal v obtained by the second microphone B (t).

[0041] For example, according to the formula v F (t)=s F (t)+β B the s B (t)+n(t) to get v F (t), according to the formula v B (t)=s B (t)+β F the s F (t)+n(t) to get v B (t), where s F (t) is the initial sound signal of the subject, s B (t) is the initial sound signal for explanation, β B To illustrate the attenuation coefficient of the sound to the first microphone, β F is the attenuation coefficient of the subject sound to the second microphone, and n(t) is the noise signal.

[0042] 102. According to v F (t) and v B (t) Obtain the final sound signal S obtained by the first microphone F (t) and obtain the final sound signal S obtained by the second microphone B (t).

[0043] For ...

Embodiment 2

[0053] This embodiment provides a method for extracting camera sound, taking camera shooting through an intelligent terminal as an example, such as figure 2 As shown, the method includes:

[0054] 201. Receive the subject's initial sound signal s through the rear microphone F (t), while receiving the narrator’s initial sound signal s through the front microphone B (t).

[0055] For example, if image 3 As shown, when a smart terminal is used to shoot a target, because the narrator (generally, the photographer) is located in the front of the terminal and is closer to the front microphone, while the target is located in the back of the terminal and is closer to the rear microphone. Therefore, in order to extract a clearer sound, use the microphone on the front of the terminal to receive the voice signal of the commentator, and use the microphone on the back of the terminal (on the same side as the camera) to receive the voice signal of the target.

[0056] Of course, due to...

Embodiment 3

[0073] This embodiment provides a camera sound extraction device 30, such as Figure 5 As shown, the device 30 includes:

[0074] The first signal acquisition unit 31 is used for formula v F (t)=s F (t)+β B the s B (t)+n(t) Get the initial sound signal v obtained by the first microphone F (t), according to the formula v B (t)=s B (t)+β F the s F (t)+n(t) Get the initial sound signal v obtained by the second microphone B (t), where s F (t) is the initial sound signal of the subject, s B (t) is the initial sound signal for explanation, β B To illustrate the attenuation coefficient of the sound to the first microphone, β F Be the attenuation coefficient of the subject sound to the second microphone, n(t) is the noise signal;

[0075] The second signal acquisition unit 32 is used for formula S F (t)=v F (t)-β B v B (t) Acquiring the final sound signal S obtained by the first microphone F (t), according to the formula S B (t)=v B (t)-β F v F (t) Acquiring the ...

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Abstract

The embodiment of the invention discloses an image pickup sound extracting method and device. The method comprises the following steps of: obtaining an initial sound signal vF(t)obtained by a first microphone according to a formula: vF(t)=s F(t)+beta BsB(t)+n(t), and obtaining an initial sound signal vB(t) according to the formula: vB(t)=s B(t)+ beta FsF(t)+n(t), wherein sF(t) is the initial sound signal of a pickup target, beta B is an attenuation coefficient for explaining the sound to the first microphone, beta F is the attenuation coefficient for explaining the pickup target sound to the second microphone, n(t) is a noise signal; obtaining a final sound signal SF(t) obtained by the first microphone according to the formula: SF(t)=vF(t)-beta BvB(t), and obtaining the final sound signal SB(t) obtained by the second microphone according to the formula: SB(t)=vB(t)- beta FvF(t); obtaining a sound signal s'F(t) and an explanation sound signal sB'(t) of the pickup target by carrying out automatic gain adjustment to the SF(t) and the SB(t). The image pickup sound extracting method and the image pickup sound extracting device disclosed by the invention are applicable to distinguishing and adjusting sounds of different targets during an image pickup process.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for extracting sound from a camera. Background technique [0002] With the development of audio technology, people's requirements for music quality are getting higher and higher. Existing audio technology mainly includes monophonic, two-channel stereophonic and channel surround sound. Among them, monophonic audio uses one microphone during the recording process, and the playback effect can only reflect the strength of the sound; dual-channel stereo audio simulates the human ears during the recording process, and uses two speakers to play the left and right ears respectively during playback. The signal recorded in the sound channel and the right channel can make the listener not only perceive the intensity of the sound, but also perceive the change of the horizontal direction of the sound; the surround sound of the channel is recorded with multiple micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0272
Inventor 闫正航
Owner DONGGUAN YULONG COMM TECH
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