Pulsed leakage tagging signal
First Claim
1. A method of detecting leakage in a communication system, the communication system transmitting television signals comprising control information and program information, the method comprising:
- a) generating a tagging signal, said signal being detectable by corresponding leakage detecting equipment;
b) identifying a portion of a television signal in which control information is present;
c) inserting the tagging signal into the television signal only during the portion of the television signal in which control information is present. d) disposing the leakage detecting equipment in a location in which leakage is desired to be measured;
e) indicating a presence of leakage on the communication system based on the detection of the inserted tagging signal.
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0 Petitions
Accused Products
Abstract
A method of transmitting a leakage tagging signal includes inserting a tagging signal into a CATV television signal only during portions of the television signal in which control information is present. A method according to the present invention is a method of transmitting a tagging signal in a communication system, the communication system transmitting television signals comprising control information and program information. One step of the method includes generating a tagging signal that is detectable by corresponding leakage detecting equipment. The method also includes the step of identifying a portion of a television signal in which control information is present. Finally, the method of the present invention encompasses inserting the tagging signal into the television signal only during the portion of the television signal in which control information is present.
48 Citations
23 Claims
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1. A method of detecting leakage in a communication system, the communication system transmitting television signals comprising control information and program information, the method comprising:
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a) generating a tagging signal, said signal being detectable by corresponding leakage detecting equipment;
b) identifying a portion of a television signal in which control information is present;
c) inserting the tagging signal into the television signal only during the portion of the television signal in which control information is present. d) disposing the leakage detecting equipment in a location in which leakage is desired to be measured;
e) indicating a presence of leakage on the communication system based on the detection of the inserted tagging signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An arrangement for the insertion of a tagging signal into a television signal, the television signal comprising control information and program information, the television signal being transmitted by a communication system, the arrangement comprising:
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a) an input connected to a source of television signals comprising control information and program information;
b) a tagging signal generator operable to generate a tagging signal that is detectable by corresponding leakage detecting equipment; and
c) a signal inserter, coupled to the input and the tagging signal generator, operable to insert the tagging signal into the television signal;
d) a switch operably coupled to the signal inserter to cause the signal inserter to insert the tagging signal only during the portion of the television signal in which control information is present. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An arrangement for performing leakage detection in a communication system, the arrangement comprising:
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a) an input connected to a source of television signals comprising control information and program information;
b) a tag insertion circuit operable to generate a tagging signal;
identify a portion of a television signal in which control information is present; and
insert the tagging signal into the television signal only during the portion of the television signal in which control information is present. c) a leakage detector operable to detect the tagging signal and generate an output responsive to detection of the tagging signal, the output indicative of a detection of leakage in the communication system. - View Dependent Claims (18, 19, 20, 21, 22, 23)
identify a portion of a television signal in which the vertical interval is present, and insert the tagging signal into the television signal only during the portion of the television signal in which the vertical interval is present. -
20. The arrangement of claim 17 wherein the leakage detector includes
an RF receiving circuit operable to receive the television signal; -
a detection circuit operable to detect the presence of the inserted tagging signal in the television signal; and
an indication circuit operable to indicate the detected presence of the inserted tagging signal.
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21. The arrangement of claim 20 wherein the detection circuit includes an analog to digital converter and a digital detection circuit.
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22. The arrangement of claim 20 wherein the indication circuit includes a visible display.
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23. The arrangement of claim 21 wherein the digital detection circuit includes:
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a digital filter circuit operable to generate a filtered digital signal having pulses corresponding to the inserted tagging signal, a pulse extraction circuit operable to generate a digital pulse signal comprising pulse samples representative of the pulses of the filtered digital signal; and
a tag signal extraction circuit operable to generate information representative of an amplitude of the inserted tagging signal based on the pulse samples.
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Specification