Locating noise in communications systems
AssigneeInternational Standard Electric Corporation
InventorThomas Oswald
Life of this patent
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Abstract
An impulse noise source in a bidirectional submerged communications system is positionally located by detection apparatus at one end of the system which measures the time interval between the same impulse arriving twice at the one end of the system, firstly, via a shorter or faster path in the system (either the incoming path to the one end, or a reference frequency band in the incoming path) and, secondly, via a longer or slower path in the system (either the go path from the noise source, a go/return distant loop and the incoming path, or another frequency band in the incoming path). Group delay distortion of the system affects the location accuracy and is equalized by networks in the detection apparatus.
Claims19
A method of locating a source of impulse noise in a communication system comprising the steps of:
- measuring the time interval between the same noise impulse arriving at one terminal of said system via two paths of said system having different delays;
- and
- indicating said time interval in a manner representing the distance of said source of said impulse from said one terminal to locate the position of said source of said impulse in said system.
Apparatus for locating a source of impulse noise in a communication system comprising:
- impulse detection means disposed in one terminal of said system to detect the arrival of a noise impulse at said one terminal over a first faster or short path in said system and a second slower or longer path in said system;
- and
- means coupled to said detection means to measure the time interval between the two arrivals of said impulse and to indicate said interval in a manner representing the distance of said source of said impulse from said one terminal of said system to locate the position of said source of said impulse in said system.
Dependencies are inferred from the claim text.