Portable audio device having reduced sensitivity to RF interference and related methods

A portable audio device having reduced sensitivity to RF interference over a predetermined frequency range from an adjacent mobile wireless communications device comprising:

• a portable housing;
• a battery carried by said portable housing;
• a recharging power input connected to said battery;
• a digital signal input;
• an audio analog signal output;
• a memory carried by said portable housing and powered by said battery for storing digital stereo audio files input thereto via said digital signal input;
• a digital-to-analog converter (DAC) carried by said portable housing and powered by said battery for converting a selected digital stereo audio file from said memory into an analog audio signal;
• an audio analog amplifier connected between said DAC and said audio analog signal output;
• at least one first RF filter connected to said recharging power input for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device;
• at least one second RF filter connected to said audio analog signal output for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device;
• and
• at least one third RF filter connected to said digital signal input for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device.

A method for reducing sensitivity of a portable audio device to RF interference over a predetermined frequency range from an adjacent mobile wireless communications device, the portable audio device comprising a portable housing, a battery carried by the portable housing, a recharging power input connected to the battery, a digital signal input, an audio analog signal output;

• a memory carried by the portable housing and powered by the battery for storing digital audio files input thereto via the digital signal input, a digital-to-analog converter (DAC) carried by the portable housing and powered by the battery for converting a selected digital audio file from the memory into an analog audio signal, and an audio analog amplifier connected between the DAC and the audio analog signal output, the method comprising:
• connecting at least one first RF filter to the recharging power input for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device;
• and
• connecting at least one second RF filter to the audio analog signal output for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device.