Calculation method of external ear sound signal transfer function and application

A technology of transfer function and sound signal, applied in the direction of earpiece/headphone accessories, etc., can solve the problem of not being able to pick up the sound signal of the human eardrum

Active Publication Date: 2016-02-10
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect in the prior art that the acoustic signal received by the human eardrum in the original sound field cannot be truly pi

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  • Calculation method of external ear sound signal transfer function and application
  • Calculation method of external ear sound signal transfer function and application
  • Calculation method of external ear sound signal transfer function and application

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Embodiment Construction

[0076] The present invention will be further described now in conjunction with accompanying drawing.

[0077] For ease of understanding, the concept of the transfer function involved in the present invention will be described in detail before the method of the present invention is described in detail.

[0078] Such as figure 1 As shown, the sound pressure signal received by the listener's tympanic membrane in the original sound field (the sound pressure signal is denoted as P in this application ed ) is an ideal signal that people have always hoped to obtain. As mentioned in the background art, it is very dangerous and inconvenient to place the microphone on the tympanic membrane of a real person. exist figure 2 In a scene shown, at the ear canal of a listener (which can be a real person or a simulated human head), earplugs or sealing materials are used to seal the opening of the ear canal, and a miniature microphone, such as a microphone, is installed at the opening of the...

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Abstract

The invention relates to a calculation method of an external ear sound signal transfer function, which comprises the steps of calculating a reflection coefficient of an external earlap of a human body; simulating an external auditory canal of the human body to be a combination of a plurality of sound pipes with a certain length and a cross section function, and calculating a reflection coefficient of each sound pipe at the boundary; calculating a reflection coefficient at the tympanic membrane of the human body; acquiring a transfer function between an equivalent volume velocity source of a listener ear canal and the volume velocity at the tympanic membrane by the reflection coefficient of the external earlap of the human body, the reflection coefficient at the boundary of each simulated sound pipe and the reflection coefficient at the tympanic membrane of the human body; and deducing a transfer function between a sound pressure signal of the closed ear canal and a sound pressure signal received by the tympanic membrane of the listener at an original sound field according to impedance of the tympanic membrane and radiation impedance of the earlap and the transfer function between the equivalent volume velocity source of the listener ear canal and the volume velocity at the tympanic membrane.

Description

technical field [0001] The invention relates to the field of acoustics, in particular to a calculation method and application of a sound signal transfer function of the outer ear. Background technique [0002] For a long time, recording and replaying the sound pressure signal of the listener's tympanic membrane in the original sound field has always been an ideal method for people to obtain the immersive auditory effect of the original sound field. However, it is extremely dangerous and difficult to directly place the microphone on the human eardrum to record the sound pressure signal. In addition, the shape and size of people's head and ears vary from person to person, and a unified recording and playback system cannot enable different people to obtain signals received by their own unique original sound field tympanic membranes. [0003] Those skilled in the art try to use a standard dummy head to replace the human head and ear canal in order to obtain the recording at the...

Claims

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Application Information

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IPC IPC(8): H04R1/10
Inventor 邓惠群杨军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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