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US5263048A
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Narrow band interference frequency excision method and means
Assignee: Magnavox Electronic Systems Co
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Filing: 1992-07-24
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Granted: 1993-11-16
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Expires: 2012-07-24
Abstract
Abstract In a preferred embodiment, a method for excising narrow band interferers in a spread spectrum signal communication which includes the steps of: receiving the spread spectrum signal; digitizing the spread spectrum signal; transforming the digitized signal from the time domain to the frequency domain; discarding the magnitude of the digitized signal and replacing it with a normalized value; and transforming the digitized signal back to the time domain.
Inventors
- 👤 Bobby R. Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/71; H04B1/7102; H04K; H04K3/00; H04K3/20; H04K3/22; H04K3/224; H04K3/228
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
A method for excising narrow band interferers in a spread spectrum signal communication, comprising the steps of: (a) receiving said spread spectrum signal; (b) digitizing said spread spectrum signal; (c) transforming, in real time, said digitized signal from a time domain to a frequency domain, with said digitized signal having a magnitude; (d) discarding, in real time, said magnitude of said digitized frequency domain signal and replacing it with a normalized value; and (e) transforming, in real time, said normalized signal back to said time domain.
Claim 2
Independent Claim
86 words
A method for excising narrow band interferers in a spread spectrum signal communication, comprising the steps of: (a) receiving said spread spectrum signal; (b) digitizing said spread spectrum signal; (c) transforming, in real time, said digitized signal from a time domain to a frequency domain, with said digitized signal having a magnitude; (d) discarding, in real time, said magnitude of said digitized frequency domain signal and replacing it with a normalized value; and (e) transforming, in real time, said normalized signal back to said time domain.
Claim 3
Dependent Claim
67 words
A method, as defined in claim 1, wherein (d) comprises the steps of: (d 1 ) utilizing a rectangular-to-polar conversion to resolve said digitized frequency domain signal into its magnitude and phase components; (d 2 ) discarding said magnitude component; and (d 3 ) utilizing a rectangular-to-polar conversion with the magnitude set to an arbitrary value to return said digitized frequency domain signal to a normalized spectrum.
Claim 4
Dependent Claim
17 words
A method, as defined in claim 12 wherein step (c) is accomplished utilizing a Fast Fourier Transform.
Claim 5
Dependent Claim
18 words
A method, as defined in claim 1, where step (e) is accomplished utilizing an Inverse Fast Fourier Transform.
Claim 6
Independent Claim
114 words
An apparatus for excising narrow band interferers in a spread spectrum signal communication, comprising: (a) receiving means to receive said spread spectrum signal; (b) digitizing means coupled to said receiving means to digitize said spread spectrum signal; (c) first transforming means coupled to said digitizing means to transform, in real time, said digitized signal from a time domain to a frequency domain; (d) rejection means coupled to said first transforming means to discard, in real time, the magnitude of said digitized frequency domain signal and replace it with a normalized value; and (e) second transforming means coupled to said rejection means to transform, in real time, said normalized signal back to said time domain.
Claim 7
Independent Claim
114 words
An apparatus for excising narrow band interferers in a spread spectrum signal communication, comprising: (a) receiving means to receive said spread spectrum signal; (b) digitizing means coupled to said receiving means to digitize said spread spectrum signal; (c) first transforming means coupled to said digitizing means to transform, in real time, said digitized signal from a time domain to a frequency domain; (d) rejection means coupled to said first transforming means to discard, in real time, the magnitude of said digitized frequency domain signal and replace it with a normalized value; and (e) second transforming means coupled to said rejection means to transform, in real time, said normalized signal back to said time domain.
Claim 8
Dependent Claim
65 words
An apparatus, as defined in claim 5, wherein said rejection means comprises: (d 1 ) first rectangular-to-polar conversion means to resolve said digitized frequency domain signal into its magnitude and phase components and to discard said magnitude component; and (d 2 ) second rectangular-to-polar conversion means with the magnitude set to an arbitrary value to return said digitized frequency domain signal to a normalized spectrum.
Claim 9
Dependent Claim
18 words
An apparatus, as defined in claim 5, wherein said first transforming means is a Fast Fourier Transform device.
Claim 10
Dependent Claim
19 words
An apparatus, as defined in claim 5, wherein said second transforming means is an Inverse Fast Fourier Transform device.
Claim 11
Independent Claim
129 words
A method for excising narrow band interferers in a spread spectrum time domain signal communication, comprising the steps of: (a) receiving said spread spectrum time domain signal; (b) digitizing said spread spectrum time domain signal; (c) transforming said digitized time domain signal from a time domain to a frequency domain; (d) discarding the magnitude of said digitized signal and replacing it with a normalized value by: (d 1 ) utilizing a rectangular-to-polar conversion to resolve said digitized frequency signal into its magnitude and phase components; (d 2 ) discarding said magnitude component; and (d 3 ) utilizing a rectangular-to-polar conversion with the magnitude set to an arbitrary value to return said digitized frequency signal to a normalized spectrum; and (e) transforming said normalized signal back to said time domain.
Claim 12
Independent Claim
129 words
A method for excising narrow band interferers in a spread spectrum time domain signal communication, comprising the steps of: (a) receiving said spread spectrum time domain signal; (b) digitizing said spread spectrum time domain signal; (c) transforming said digitized time domain signal from a time domain to a frequency domain; (d) discarding the magnitude of said digitized signal and replacing it with a normalized value by: (d 1 ) utilizing a rectangular-to-polar conversion to resolve said digitized frequency signal into its magnitude and phase components; (d 2 ) discarding said magnitude component; and (d 3 ) utilizing a rectangular-to-polar conversion with the magnitude set to an arbitrary value to return said digitized frequency signal to a normalized spectrum; and (e) transforming said normalized signal back to said time domain.
Claim 13
Dependent Claim
17 words
A method, as defined in claim 9, wherein step (c) is accomplished utilizing a Fast Fourier Transform.
Claim 14
Dependent Claim
18 words
A method, as defined in claim 9, wherein step (e) is accomplished utilizing an Inverse Fast Fourier Transform.
Claim 15
Independent Claim
158 words
An apparatus for excising narrow band interferers in a spread spectrum signal communication, comprising: (a) receiving means to receive said spread spectrum signal; (b) digitizing means coupled to said receiving means to digitize said spread spectrum signal; (c) first transforming means coupled to said digitizing means to transform said digitized signal from a time domain to a frequency domain; (d) rejection means coupled to said first transforming means to discard the magnitude of said digitized frequency signal and replace it with a normalized value through the use of (d 1 ) first rectangular-to-polar conversion means to resolve said digitized frequency signal into its magnitude and phase components and to discard said magnitude component; and (d 2 ) second rectangular-to-polar conversion means with the magnitude set to an arbitrary value to return said digitized signal to a normalized spectrum; and (e) second transforming means coupled to said rejection means to transform said normalized signal back to said time domain.
Claim 16
Independent Claim
158 words
An apparatus for excising narrow band interferers in a spread spectrum signal communication, comprising: (a) receiving means to receive said spread spectrum signal; (b) digitizing means coupled to said receiving means to digitize said spread spectrum signal; (c) first transforming means coupled to said digitizing means to transform said digitized signal from a time domain to a frequency domain; (d) rejection means coupled to said first transforming means to discard the magnitude of said digitized frequency signal and replace it with a normalized value through the use of (d 1 ) first rectangular-to-polar conversion means to resolve said digitized frequency signal into its magnitude and phase components and to discard said magnitude component; and (d 2 ) second rectangular-to-polar conversion means with the magnitude set to an arbitrary value to return said digitized signal to a normalized spectrum; and (e) second transforming means coupled to said rejection means to transform said normalized signal back to said time domain.
Claim 17
Dependent Claim
18 words
An apparatus, as defined in claim 12, wherein said first transforming means is a Fast Fourier Transform device.
Claim 18
Dependent Claim
19 words
An apparatus, as defined in claim 12, wherein said second transforming means is an Inverse Fast Fourier Transform device.
References Cited (Backward Citations)
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