It is said that Fengli brand hearing AIDS have frequency shifting function. What is a frequency shift hearing aid?

Frequency shift technology is a patent of Fengli, especially for hearing AIDS for extremely severely deaf children. Frequency-shifted hearing AIDS, that is, hearing AIDS with high-frequency remodeling function, are also called frequency-shifted hearing AIDS. Frequency shift technology can compress the high-frequency sound that patients with high-frequency hearing loss can't hear and then transfer it to the medium-high frequency with acceptable residual hearing, and the sound of low-frequency part is completely unaffected. The advantage of this is that on the one hand, high-frequency hearing is better compensated and the sound sounds clearer; On the other hand, because the high-frequency sound shifts to the middle-high frequency, the risk of howling of hearing AIDS is reduced and the residual hearing of patients is protected.