System and method for signal validation and leakage detection
First Claim
1. A method of validating signals and detecting signal leakage in a cable communications system, the cable communications system providing channel programming on a plurality of RF channels, the method comprising the steps of:
- a) tuning a radio frequency receiver to a desired visual carrier center frequency of a selected RF channel;
b) measuring a signal level of the carrier center frequency energy;
c) off-tuning the receiver by a predetermined offset such that an off-tuned carrier frequency, within the same RF television channel allocation but at an alternate to the center carrier frequency location and independent of side band frequency location or coded signal detection, where carrier center freauency and/or side band energy in said channel programming received by said receiver, when off-tuned, should be reduced below carrier center frequency energy in the absence of interference, is selected;
d) measuring a signal level of the off-tuned carrier frequency energy;
e) obtaining a signal level difference between the signal level of the carrier center frequency and the signal level of the off-tuned carrier frequency to determine if interference exists;
f) declaring an interference condition if the signal level difference is less than a predetermined difference amount; and
g) providing an indication of the signal level of the carrier frequency to permit a determination of whether a signal leakage condition exists without requiring use of a coded signal of said channel programming.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and method of validating signals and detecting signal leakage in a cable communications includes the steps of a) tuning a radio frequency receiver to a carrier frequency of a selected RF channel, b) measuring a signal level of the carrier frequency, c) off-tuning the receiver by a predetermined offset, d) measuring a signal level of the off-tuned carrier frequency, e) obtaining a signal level difference between the signal level of the carrier frequency and the signal level of the off-tuned carrier frequency to determine if interference exists, f) declaring an interference condition if the signal level difference is less than a predetermined difference amount, and g) providing an indication of the signal level of the carrier frequency to permit a determination of whether a signal leakage condition exists.
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Citations
35 Claims
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1. A method of validating signals and detecting signal leakage in a cable communications system, the cable communications system providing channel programming on a plurality of RF channels, the method comprising the steps of:
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a) tuning a radio frequency receiver to a desired visual carrier center frequency of a selected RF channel; b) measuring a signal level of the carrier center frequency energy; c) off-tuning the receiver by a predetermined offset such that an off-tuned carrier frequency, within the same RF television channel allocation but at an alternate to the center carrier frequency location and independent of side band frequency location or coded signal detection, where carrier center freauency and/or side band energy in said channel programming received by said receiver, when off-tuned, should be reduced below carrier center frequency energy in the absence of interference, is selected; d) measuring a signal level of the off-tuned carrier frequency energy; e) obtaining a signal level difference between the signal level of the carrier center frequency and the signal level of the off-tuned carrier frequency to determine if interference exists; f) declaring an interference condition if the signal level difference is less than a predetermined difference amount; and g) providing an indication of the signal level of the carrier frequency to permit a determination of whether a signal leakage condition exists without requiring use of a coded signal of said channel programming. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of validating signals and detecting signal leakage in a cable communications system, the cable communications system providing channel programming on a plurality of RF channels, the method comprising:
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a) tuning a radio frequency receiver to a desired visual carrier center frequency of a selected RF channel; b) measuring a signal level of the carrier center center frequency energy; c) saving the measured signal level of the carrier frequency in memory; d) off-tuning the receiver by a predetermined offset such that an off-tuned carrier frequency, within the same RF television channel allocation but at an alternate to the center carrier frequency location and independent of side band frequency location or coded signals in said channel programming, where carrier center frequency energy and/or side band energy in said channel programming received by said receiver, when off-tuned, should be reduced below carrier center frequency energy in the absence of interference, is selected; e) measuring a signal level of the off-tuned carrier frequency energy; f) saving the measured signal level of the off-tuned carrier frequency in memory; g) subtracting the signal level of the off-tuned carrier frequency from the signal level of the carrier center frequency to obtain a signal level difference; h) declaring an interference condition if the signal level difference is less than a predetermined difference amount; and i) displaying the measured signal level of the carrier center frequency to permit a determination that a signal leakage condition exists. - View Dependent Claims (23)
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24. A system for validating signals and detecting signal leakage in a cable communications system, the cable communications system providing channel programming on a plurality of RF channels, the system comprising:
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a radio frequency receiver; a computer operatively coupled to the receiver and to a display, the receiver configured to tune to a carrier center frequency of a selected RF channel responsive to the computer, measure a signal level of the carrier center frequency of the selected RF channel, and display the measured signal level on the display; the computer directing the receiver to off-tune by a predetermined offset such that an off-tuned carrier frequency within the same RF television channel allocation but at an alternate location to the center carrier frequency and independent of side band frequency location where carrier center frequency energy and/or side band energy received by said receiver, when off-tuned, should be reduced, is selected, and measure a signal level of the off-tuned carrier frequency without requiring detection of a coded signal in said channel programming; and wherein the computer calculates a signal level difference between the signal level of the carrier center frequency and the signal level of the off-tuned carrier frequency, and declares an interference condition if the signal level difference is less than a predetermined difference amount. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification