Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2011-04-12
2011-04-12
Milord, Marceau (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S063100, C455S067130, C455S566000, C455S575500, C455S569100, C455S301000, C455S550100, C379S167150, C439S076100, C439S078000
Reexamination Certificate
active
07925315
ABSTRACT:
A portable audio device having reduced sensitivity to RF interference over a predetermined frequency range from an adjacent mobile wireless communications device may include a portable housing, a battery carried thereby, a recharging power input connected to the battery, a digital signal input, and an audio analog signal output. A digital-to-analog converter (DAC) may be carried by the portable housing and powered by the battery for converting a selected digital audio file from a memory into an analog audio signal. An audio analog amplifier may be connected between the DAC and the audio analog signal output. A first RF filter(s) may be connected to the recharging power input, and a second RF filter(s) may be connected to the audio analog signal output, both for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device.
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Corrigan Michael
Mankaruse George
Zhu Lizhong
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Milord Marceau
Research In Motion Limited
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