Digital automatic acoustic-control otoacoustic immittance detection system and digital signal compensation method thereof

Abstract

The invention provides a digital automatic acoustic-control otoacoustic immittance detection system and a digital signal compensation method thereof. The system sequentially comprises a probe tone D/A (digital to analog) conversion circuit, a drive circuit, a speaker, a human ear, a pick-up and an A/D (analog to digital) conversion circuit which are connected in series, wherein the input end of the probe tone D/A conversion circuit and the output end of the A/D conversion circuit are connected with an FPGA (field programmable gate array) chip correspondingly and respectively; the output end of the FPGA chip is connected with the probe tone D/A conversion circuit through an acoustic-control D/A conversion circuit; and the FPGA chip is also connected with a CPU (central processing unit) which is connected with a display/peripheral interface unit. The method comprises the following steps of: calculating an echo signal difference deltaV= Vi-Vref between a test ear and a standard ear, wherein Vi is a test ear echo signal, and Vref is standard ear reference voltage; and calculating a volume control voltage value delta= KdeltaV+ Vref according to the echo signal difference between the test ear and the standard ear, wherein K is between 0 and 1. According to the system and the method, digital real-time otoacoustic immittance measurement and a constant-voltage acoustic control functioncan be realized, and acoustic measurement strength in a detection and measurement process is maintained to be constant.

Description

technical field [0001] The invention relates to an otoacoustic impedance detection system. In particular, it relates to a digital automatic sound-controlled otoacoustic impedance detection system and a digital signal compensation method for realizing digital real-time otoacoustic impedance measurement and constant-voltage sound control functions. Background technique [0002] Otoacoustic immittance measurement technology is an objective method developed in recent years to detect middle ear function. Its important position in clinical otology and audiology diagnosis has been recognized by clinicians, and it has become an advanced means to improve the correct rate of ear disease diagnosis. At present, the clinically used otoacoustic impedance test system adopts complex analog detection circuit means to realize otoacoustic impedance measurement. The invention designs a digital otoacoustic impedance test algorithm, and realizes otoacoustic impedance measurement and constant-vo...

AI Technical Summary

Problems solved by technology

At present, the clinically used otoacoustic impedance test system uses complex analog detection circuit means to realize otoacoustic impedance measurement.

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