Patent ID: 7813100

Claim:
A demagnetization circuit of a mobile phone for reducing interference, comprising: a wave filter configured to filter a received audio signal from the mobile phone, the wave filter comprising an input to receive the audio signal and an output; a high frequency circuit configured to filter high frequencies of the filtered audio signal, the high frequency circuit comprises a capacitor; the demagnetization circuit structured and arranged to generate an opposite magnetic field to that of the mobile phone to reduce pulse magnetic fields generated by the mobile phone, wherein the demagnetization circuit comprises a first inductor and a second inductor wound in the same direction, the demagnetization circuit further comprises a first surface mount resistor, a second surface mount resistor, a first resistor and a second resistor, one end of the second resistor is coupled to a junction of the first inductor and the first surface mount resistor, the other end is coupled to the second surface mount resistor, the other end of the second surface mount resistor is coupled to the second inductor; and an audio playing circuit comprising an audio player, the audio player comprising a first connection and a second connection, the first connection coupled to the output of the wave filter, and second connection coupled to the input of the wave filter, one end of the first resistor is coupled to the input of the capacitor, and the other end is coupled to a junction of the first inductor and second inductor, one end of the first surface mount resistor is coupled to the capacitor, and the other end is coupled to the first inductor.