Directional loudspeaker, mobile terminal radiation protection system and method

Abstract

The invention provides a directional loudspeaker, a mobile terminal radiation protection system and a method. The directional loudspeaker includes: a bluetooth module receives an audio signal from themobile terminal, and transmits to the signal processing module, A signal processing module performs distortion preprocessing on the audio signal, and amplitude modulating the processed audio signal and the ultrasonic carrier signal, An ultrasonic modulation signal is generate, that power amplification module amplify the ultrasonic modulation signal, and a new audio signal is self-regulated to generate a new audio signal by utilizing the non-linear effect generated when the ultrasonic modulation signal propagates in the air, and the loudspeaker module play the new audio signal, thereby realizing directional loudspeaker. The directional loudspeaker is arranged in the mobile terminal, so that the appearance of the mobile terminal does not need to be reformed. After the directional loudspeaker is used, the mobile terminal can be used to maintain a certain distance for talking, so that the talking sound can be transmitted to the user in a fixed range, and other people can be avoided. The directional loudspeaker not only has the function of radiation protection, but also can protect personal privacy.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a directional loudspeaker, a radiation protection system and method for a mobile terminal. Background technique [0002] With the rapid development of economy and technology, microwave communication and mobile Internet are popularized rapidly, and mobile communication has become a daily necessities that cannot be separated from people. The rapid development of mobile phone communication technology from 2G, 3G to 4G has greatly facilitated people's lives. At present, 4G smartphones have become popular. The number of mobile phones in China exceeds one billion, and the number of mobile phones in the world is as high as billions. The mobile Internet covers most of the human settlements on the earth. [0003] The mobile phone communication band belongs to the microwave band, about 300MHz-3GHz frequency range. Studies have shown that while microwave communication is convenient fo...

AI Technical Summary

Problems solved by technology

Studies have shown that while microwave communication is convenient for people's lives, it also brings electromagnetic pollution problems that cannot be ignored. The damage to human health caused by close-range microwave radiation generated when calling and receiving mobile phones has gradually been revealed and exposed. The side effects of microwave radiation will affect The health of every mobile phone user

Images