Frequency modulation anti-interference hidden earphone system

Abstract

The invention discloses a frequency modulation anti-interference hidden earphone system which is used for being connected with an interphone so as to obtain an audio signal and conducting FM on the audio signal. The frequency modulation anti-interference hidden earphone system comprises an adapter and earphones. The adapter comprises an interface module, a power module, an audio quality detection module, a gain control module, an FM module and a signal amplification module. The interface module is connected with the interphone, the audio quality detection module and the gain control module. The gain control module, the FM module and the signal amplification module are connected in sequence. The signal amplification module is connected with the earphones wirelessly. According to the frequency modulation anti-interference hidden earphone system, after FM is conducted on the audio signal, the audio signal is transmitted to the earphones, demodulated through the earphones, processed through a DSP and then played. Compared with existing AM, FM has the advantages of being smaller in distortion, wide in frequency response, high in signal-to-noise ratio, high in amplification efficiency, better in noise resistant effect and capable of improving the tone quality. The audio signal is stabilized through the gain control module so that the communication quality can be improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an FM anti-jamming concealed earphone system. Background technique [0002] The current wireless electromagnetic induction earphones adopt audio induction technology, the transmitting end directly emits audio magnetic field signals, and the earphones receive the magnetic field signals and convert them into sound signals. However, in the real environment, there are many sources of interference that are the same or similar to the audio frequency, such as power frequency, automobiles, hair dryers, electric soldering irons, and PC screens. Therefore, ordinary electromagnetic induction earphones are easily disturbed. Moreover, ordinary wireless electromagnetic induction earphones do not have wireless PTT function, which is inconvenient to operate. [0003] The invention patent with the application number 200680056251.5 mentions a communication system with an inductive link fro...

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Problems solved by technology

[0004] However, AM modulation has the disadvantages of large signal distortion, not wide frequency response, poor signal-to-noise ratio, low amplifier efficiency, and poor anti-interference ability

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