With the smart phone features a strong, mobile phone app development also maintained a strong momentum. Which need to use the headset app is also very rich. Now the smart phone is not only easy to listen to songs, movies, etc., even the K songs are very convenient. K songs all the people, sing it, cool my music, and so more and more loved by young friends. Not only can you sing to their own listening, you can sing to strangers to listen to, sing well, high popularity, not only has a large number of fans, but also earn a lot of money.

First of all, the way the sound is transmitted to the inner ear, there are two, one is the most common air conduction (involving the ear structure, the specific process is not introduced, the other is recently a little more common bone conduction. Through the head of the skull vibration, the sound waves directly to the perineum to produce hearing. The application of bone conduction technology headphone type is still very little.
Two conditions - frequency and intensity - must be satisfied for audible stimuli. Only when a sound frequency reaches a certain range, and the sound intensity reaches a certain level, people can hear the sound. Normal hearing for young people (12 years old to 25 years old) can perceive the sound frequency range is: 16HZ-20000HZ, most people's hearing frequency range is 20HZ-20000HZ, one of the 1000HZ-2000HZ frequency range of sound, it is good. After 25 years of age, the sensitivity of the frequency above 15000HZ significantly reduced. As the age increases, the frequency-sensing upper limit decreases year by year. But for the frequency f <1000HZ low-frequency sound, almost no increase with age and reduce the perceived sensitivity.