Calculation method of external ear sound signal transfer function and application

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...

AI Technical Summary

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 picked up in the entire audio frequency range, thereby providing a signal that can safely and conveniently obtain a signal close to the real eardrum sound and faithfully reproduce it Methods

Images