Call signal generating device
AssigneeNEC Access Technica, Ltd.
InventorTAKUMA AOSHIMA
Life of this patent
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Abstract
A call signal generating device, whose pair of output terminals is connected to a telephone set, includes a rectifier rectifying an inputted high frequency signal and maintaining an output polarity in one of two polarities ; and a polarity reverser generating a call signal by periodically reversing the output polarity of the rectifier and supplying it to the telephone set via the pair of output terminals.
Claims7
A call signal generating device whose pair of output terminals is connected to a telephone set, the call signal generating device comprising:
- a rectifier rectifying an inputted high frequency signal and maintaining an output polarity in one of two polarities;
- and
- a polarity reverser generating a call signal by periodically reversing the output polarity of the rectifier and supplying it to the telephone set via the pair of output terminals.
A call signal generating device whose pair of output terminals is connected to a telephone set, the call signal generating device comprising:
- rectification means for rectifying an inputted high frequency signal and maintaining an output polarity in one of two polarities ;
- and
- polarity reversing means for generating a call signal by periodically reversing the output polarity of the rectification means and supplying it to the telephone set via the pair of output terminals.
Dependencies are inferred from the claim text.