Audiometry device based on over-sampled multi-frequency multi-amplitude joint estimated auditory evoke potentials

Abstract

The invention provides an audiometry device based on over-sampled multi-frequency multi-amplitude joint estimated auditory evoke potentials. The audiometry device comprises a device control module, as well as a modulation sound generation device, a data acquisition device and a data processing and analysis module, which are connected with the device control module respectively. The device has thefollowing advantages and technical effects: 22 modulation sounds with different modulation frequencies and carrier frequencies can be utilized to simultaneously simulate the human ears and simultaneously evoke multiple ASSRs (auditory steady-state evoke responses); the frequency spectrum estimation algorithm of multi-frequency multi-amplitude joint estimation is adopted for estimating the amplitudes of the modulation signals in the auditory evoked potentials, thereby estimating the response of a carrier signal corresponding to each modulation signal and fitting auditory frequency response curves at all levels according to all groups of amplitude responses; the audiometry device can carry out frequency spectrum estimation in the environment with low signal-to-noise ratio, has very high frequency spectrum resolution and can realize simultaneous detection of sound frequency responses of at most 22 frequencies of an auditory system; and the detection time is further greatly shortened.

Description

technical field [0001] The invention relates to the field of objective hearing testing of auditory evoked potentials, in particular to an audiometry device for jointly estimating auditory evoked potentials based on oversampling, multi-frequency and multiple amplitudes. Background technique [0002] In the clinical hearing threshold evaluation test method, it is divided into subjective hearing test and objective hearing test. Subjective side listening is to let the subject express the sound signal heard subjectively, or the tester judges it through the subject's auditory behavior. Commonly used methods include: pure tone audiometry, sound field audiometry, screening instrument audiometry, and speech audiometry. Since subjective audiometry is a subjectively determined audiometry, it is easily affected by various factors, such as psychological, spiritual, intellectual, environmental and physical factors, etc., and requires high skill of the tester. Objective listening does no...

AI Technical Summary

Problems solved by technology

Because of the short sound of ABR stimulation, poor frequency characteristics, and insufficient stimulation intensity, many deaf children cannot get results.

The frequency characteristic of 40Hz correlation potential is better than that of ABR, but it mainly reflects the hearing condition in the low frequency area, and the result cannot reflect the hearing condition in the middle and high frequency areas, and is greatly affected by sleep, so the test result is unstable

[0008] 1. At present, clinical hearing tests only test the auditory response of sounds near four frequencies such as 0.5, 1, 2, and 4KHz, and the auditory model of the human ear is similar to a group of 25 band-pass filters. , using only four frequency sounds, it is impossible to conduct a comprehensive analysis or key inspection on the damaged frequency bands in the auditory system of the hearing-impaired

Moreover, the actual human auditory frequency response curve is a smooth curve, and the curve formed by connecting four frequency points cannot fully reflect the real auditory frequency response characteristics

[0009] 2. When the multi-frequency modulation sound is used for simultaneous stimulation, due to the backward spectrum analysis technology and low spectrum resolution, the carrier frequencies on the same side need to differ by one octave. Within the frequency range of 80-105Hz, Only up to 8 frequency points can be assigned as modulation frequencies (4 on each side), which restricts the number of frequencies that can be checked at the same time. The checking efficiency is low and the checking takes a long time

In addition, long-term sound stimulation to the human ear is likely to cause ear and brain fatigue, inhibit the generation of auditory evoked responses, and affect the accuracy of test results

[0010] 3. The auditory evoked potential is a weak signal in the brain wave signal, and it is difficult to accurately estimate the response range of the weak signal in a low signal-to-noise ratio environment by simply using the weighted average method

Therefore, only the hearing threshold of the test object can be judged, and the equal loudness curves of all levels of loudness cannot be checked.

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