Directional loudspeaker, mobile terminal radiation protection system and method

Abstract

The invention provides a directional loudspeaker, a mobile terminal radiation protection system and method, the directional loudspeaker includes: a Bluetooth module receives an audio signal from a mobile terminal, and transmits it to a signal processing module, and the signal processing module performs distortion preprocessing on the audio signal, and Amplitude modulation is performed on the processed audio signal and the ultrasonic carrier signal to generate an ultrasonic modulation signal. The power amplifier module amplifies the ultrasonic modulation signal and uses the non-linear effect of the signal to self-regulate when it propagates in the air to regenerate a new audio signal. , the speaker module plays a new audio signal, thereby realizing directional speaker. The directional speaker is installed in the mobile terminal, so that there is no need to modify the appearance of the mobile terminal. After using the directional speaker, the mobile terminal can be used to maintain a certain distance for calls, so that the call sound can be transmitted to the user within a fixed range to avoid affecting others. It not only plays the role of radiation protection, but also protects 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

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