EP0542520A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Adjustable filter means
Assignee: Nokia Oyj
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Filing: 1992-11-11
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Granted: —
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Expires: 2012-11-11
Abstract
Abstract The invention relates to an adjustable filter comprising means for analysing the received signal which identifies the type of interference signal present from a predetermined set of interference signal types and an adaptive filter responsive to a control signal produced by the means for analysing the received signal dependent on the type of the interference signal detected.
Inventors
- 👤 Harri Aatos Jokinen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 16:11
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/1027; H04B2001/1072
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
An adjustable filter means for selectively attenuating an interference signal, said interference signal being part of a received signal in a cellular radio telephone, the adjustable filter means comprising; means for analysing the received signal to determine the type of interference signal present therein from a predetermined set of interference signal types; means for generating a control signal indicative of one of said predetermined set of interference signal types so determined; and means for applying the received signal and the control signal to adaptive filter means the frequency response of which is variable in response to said control signal to attenuate the interference signal.
Claim 2
Dependent Claim
35 words
An adjustable filter means as claimed in claim 1, wherein the adaptive filter means comprises a plurality of filter means each one of which corresponds to one of said predetermined set of interference signal types.
Claim 3
Dependent Claim
25 words
An adjustable filter means as claimed in claim 1 wherein the adaptive filter means comprises a digital signal processor which controls a variable filter means.
Claim 4
Dependent Claim
20 words
An adjustable filter means as claimed in claim 1, wherein the adaptive filter means comprises a controlled variable analog filter.
Claim 5
Dependent Claim
25 words
An adjustable filter means as claimed in any of the previous claims, wherein the means for analysing the received signal comprises a digital signal processor.
Claim 6
Dependent Claim
27 words
An adjustable filter means as claimed in any of claims 1 to 4, wherein the means for analysing the received signal comprises two narrow band analog filters.
Claim 7
Dependent Claim
26 words
An adjustable filter means as claimed in any of the previous claims, wherein one of the predetermined set of interference signal types is white gaussion noise.
Claim 8
Dependent Claim
25 words
An adjustable filter means as claimed in any of the previous claims, wherein one of the predetermined set of interference signal types is co-channel interference.
Claim 9
Dependent Claim
26 words
An adjustable filter means as claimed in any of the previous claims, wherein one of the predetermined set of interference signal types is adjacent channel interference.
References Cited (Backward Citations)
No citation records indexed.
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