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Patent EP0257843A2 successfully refreshed from Google Patents.
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EP0257843A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A median filter

Assignee: Allard Way Holdings Ltd
•
Filing: 1987-08-03
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Granted: —
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Expires: 2007-08-03
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Abstract

Abstract A median filter comprises a number of identical modules each arranged simultaneously to receive the current value of an incoming digital signal. Each module comprises a feedback shift register of special design enabling it to be set to receive its input to any one of its stages. The shift registers of the different modules are set to receive their inputs at different stages and logic means is associated with each shift register for comparing the content of one stage with the contents of each other stage to determine whether the content of that said one stage is the median value. If it is the median value it is passed to an output of the circut.

Inventors

  • 👤 Neville Hobson

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 09:26
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/0248; H03H17/0261; H03H17/0263; G; G06; G06F; G06F17/00; G06F17/10; G06F17/18

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 107 words
A median filter comprising a number of identical modules each arranged simultaneously to receive the current value of an incoming digital signal, each module comprising a feedback shift register which can be set to receive its input at any one of its stages, means for setting the shift registers of the different modules to receive their inputs at different stages, means associated with each shift register for comparing the content of one stage with the content of each other stage to determine whether the content of that said one stage is the median value, and for passing it to the output in response to such a detection.
Claim 2
Dependent Claim 107 words
A median filter comprising a number of identical modules each arranged simultaneously to receive the current value of an incoming digital signal, each module comprising a feedback shift register which can be set to receive its input at any one of its stages, means for setting the shift registers of the different modules to receive their inputs at different stages, means associated with each shift register for comparing the content of one stage with the content of each other stage to determine whether the content of that said one stage is the median value, and for passing it to the output in response to such a detection.
Claim 3
Dependent Claim 75 words
A median filter according to claim 1 in which the means for setting the feedback shift register includes a selector associated with each stage thereof for optionally feeding to that stage the content of a previous stage or the input signal, and means for setting the selectors so that the input signal is passed through a chosen one of the stages so that each of the other stages receives the output from the previous stage.
Claim 4
Dependent Claim 17 words
A median filter substantially as described with reference to the accompanying drawings and substantially as illustrated therein.
Claim 5
Dependent Claim 17 words
A median filter substantially as described with reference to the accompanying drawings and substantially as illustrated therein.

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