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Hearing aids are preselected when a doctor or a fitting examiner has seen a child’s medical record.
The pre selection stage includes:
1. Types of hearing aids
Ear back hearing aids are suitable for most young children. Because of the rapid growth and development of children’s outer ear, it is not recommended to use inner ear hearing aids.
Bone conduction hearing aids can be used when they cannot be used due to medical or physical limitations and are conductive.
The box hearing aid can be used when the ear back hearing aid cannot be used due to physical limitations.
2. Ear selection for hearing aids
There are many advantages for children’s binaural hearing aids
Good location of sound source
Loudness summation effect
The role of noise reduction
Reducing the sound insulation of the head
Subjective factors: good sound quality, fuller, more natural and three-dimensional
Of course, there are also disadvantages:
More cost, stronger ear blocking effect, harder loudness balance
3. Amplification circuit of hearing aid
In order to enable children to hear lighter sounds, hearing aids with digital signal processing system should be selected, which have flexible electroacoustic characteristics and can reduce noise.
When audiogram shows that different gain and output are needed in different frequency range, multi-channel hearing aid is used.
In order to improve flexibility and convenience, multiple listening programs and remote control can be applied.
Nonlinear amplification circuit: also known as full dynamic range compression circuit, which is essentially “more amplification with low noise and less amplification with high noise”. This circuit is suitable for patients with sensorineural deafness.
4. Advantages of all digital hearing aids
Digital processing technology: the sound signal is transformed into digital signal through a / D converter, which is amplified to reduce the sound distortion as much as possible.
Multichannel technology: the digital hearing aid can divide channels according to the frequency, amplify different channels in each channel, especially suitable for patients whose hearing curve is steep drop type.
ADSP (intelligent signal processing): it includes VAD (environmental noise reduction) and TSE (enhanced instantaneous signal).
New microphone / inductive system: omnidirectional and directional microphone can collect signals in different directions; microphone noise suppression function can suppress the noise generated in quiet environment.
Digital feedback control system: the roar of hearing aids is actually caused by the feedback sound being amplified multiple times in the microphone. The digital hearing aid can find out the frequency points that cause the acoustic feedback through the test, and attenuate these frequency points until the scream disappears and is monitored at any time.
5. Other auxiliary equipment
When children can move and need to hear the voice of a long-distance caregiver, both hearing aids and audio systems should be used. The audio system can improve the SNR.
When no audio system is used, directional microphone is only used to improve the SNR of older children.
Jinghao hearing aid reminder: hearing aid wearing requires professional “matching”, so it is very important to choose a professional hearing aid matching center and a hearing aid tester! If you have any hearing problems, you can call Jinghao for consultation, or come to the matching center for experience. Hearing aid free consultation Tel.: + 86-18566295705
Link：What kind of hearing aids do children choose
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