Back to results
US 7,024,175 B1Granted
System for masking microphonic voice signals in wired telecommunications equipment
AssigneeMitel Corporation
InventorsPhilippe Moquin, Bipin Pillay
Life of this patent
Estimating the term…
Abstract
A system to thwart eavesdropping on microphonic audio signals generated by a powered telecommunications device connected to a communications line, comprising a noise generator for applying low level noise to the line, thereby masking microphonic audio signals, and a disconnect circuit for disconnecting the telecommunications device from the line in the absence of power to the telecommunications device.
Claims14
A system of a powered telecommunications device connected to a communications line, comprising:
- a transformer and hybrid bidirectionally coupling communications between said telecommunications device and said communications line;
- and
- a noise generator connected to said hybrid applying low level noise to said line, masking microphonic audio signals to thwart eavesdropping on said microphonic audio signals generated by the powered telecommunications device when the device is on-hook and connected to the communications line, without interfering with a normal operation of the powered telecommunications device.
A method of a powered telecommunications device connected to a communications line, comprising:
- generating low level noise;
- and
- applying said low level noise to said line, masking microphonic audio signals to thwart eavesdropping on said microphonic audio signals generated by the powered telecommunications device when the device is on-hook and connected to the communications line, without interfering with a normal operation of the powered telecommunications device.
A method, comprising:
- generating and applying low level noise to a communications line connected to a telecommunication device;
- and
- masking microphonic audio signals inadvertently generated on said communication line, to thwart eavesdropping on said microphonic audio signals which pickup audio sounds in a room containing the telecommunication device when the device is on-hook and connected to the communications line, without interfering with a normal operation of the powered telecommunications device.
Dependencies are inferred from the claim text.