Method and apparatus for television band pilot sensing
First Claim
Patent Images
1. A DTV pilot sensor, comprising:
- a spectrum smoothing filter that smoothes a power spectrum of a received television band channel and provides an output;
a pilot tone peak search module that computes a peak signal power of a narrow frequency window centered around a designated DTV pilot position of the output of the spectrum smoothing filter and provides an output;
a conditioned signal power estimation module that estimates an average received signal power in a wide frequency window located in a designated data portion of the output of the spectrum smoothing filter and provides an output; and
a tone detection module that compares the output of the pilot tone peak search module with a product of the output of the conditioned signal power estimation module multiplied by a programmable power ratio to determine whether a DTV pilot tone has been detected.
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Abstract
A DTV pilot sensor generates DTV pilot tone detection decisions associated with monitored television band channels without knowledge or estimation of a noise level of the monitored channel.
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Citations
36 Claims
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1. A DTV pilot sensor, comprising:
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a spectrum smoothing filter that smoothes a power spectrum of a received television band channel and provides an output; a pilot tone peak search module that computes a peak signal power of a narrow frequency window centered around a designated DTV pilot position of the output of the spectrum smoothing filter and provides an output; a conditioned signal power estimation module that estimates an average received signal power in a wide frequency window located in a designated data portion of the output of the spectrum smoothing filter and provides an output; and a tone detection module that compares the output of the pilot tone peak search module with a product of the output of the conditioned signal power estimation module multiplied by a programmable power ratio to determine whether a DTV pilot tone has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of sensing a DTV pilot tone in a television band, comprising:
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tuning a radio frequency front end to a frequency associated with a television channel in the television band; smoothing a power spectrum of a received signal associated with the television channel; searching a first frequency window centered around a designated DTV pilot position of the smoothed power spectrum to locate a peak power of the narrow frequency window; estimating an average power of a second wider frequency window located in a designated data portion of the smoothed power spectrum; and comparing the peak power of the first frequency window with a product of the average power of the wider frequency window multiplied by a programmable power ratio to determine whether a DTV pilot tone has been detected. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A TV band device comprising:
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pilot tone peak search logic that searches for a peak signal power in a narrow frequency window centered around a designated DTV pilot position of a smoothed power spectrum of a signal associated with a television band channel; conditioned signal power estimation logic that estimates an average received signal power in a wide frequency window located in a designated data portion of a smoothed power spectrum; and pilot tone detection logic that compares an output of the pilot tone peak search logic with a product of an output of the conditioned signal power estimation logic multiplied by a programmable power ratio to determine whether a DTV pilot tone has been detected. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification