Three key design points:
1) Small size. The so-called invisible, in fact, means completely hidden deep within the ear canal without being seen by others. According to statistics, the volume of the human ear canal is only 2 milliliters, in other words, in the space of two milliliters, the invisible hearing aid should include (a) microphone; (b) amplifier or called electronic chip; (c) battery; (d) speaker; (e) housing and other five basic elements.
2) Low energy consumption. This is the hearing aid electronic circuit design is the most difficult to overcome the problem. Because as a need for power supply and a long time (at least 12-18 hours of continuous work every day) energy-consuming medical equipment, it is the basic requirements of the circuit energy consumption is 6 milliamps per hour, but to promote the microphone, speakers, and for the intelligent function of the acoustic signal sampling and amplification of the sound electronic chip to provide power, this requirement is very harsh.
3) Intelligent acoustic signal processing. If the invisible hearing aid design and categorized as a "computer class" products, then it is essential that the line design requirements are not only simple acoustic signal amplification, but also requires that the acoustic signal operation judgment and then the shielding of the noise shielding, the amplification of the language signal amplification, which has a series of formulas to allow the circuit to be able to distinguish and trade-offs.
Other additional requirements include white noise to intervene with tinnitus sufferers; specific music to calm the user; logging of user behavioral patterns or usage patterns to provide a basis for adjusting data; and connecting with wireless communication tools such as UHF or Bluetooth, and so on.