How to create a more effective Filter for the dishwashers of tomorrow..

This paper describes the work done trying to diminish the noise present in the signal from an IR-detector. The project was aiming towards two different kinds of applications; heat protection and presence detection. The hypothesis was that the signal-noise ratio would decrease if a Filter and a proper installation were used for the detector. Some experiments were executed to determine what kind of Filter were the most suitable for each application and how these could be installed. After executing the experiments and evaluate the results we recommend to use a specific Filter for each application.

IIR-Filter är överlägsna traditionellt skapade FIR-Filter på många punkter. De klarar sig med en klart lägre ordning för att realisera ett Filter med samma egenskaper. En nackdel är däremot att filtret är klart känsligare för koefficient kvantisering och förlorar sina egenskaper när koefficienterna ändras, detta inträffar även om förändringen är liten. Genom den speciella struktur som vågdigitala Filter använder sig av kommer man runt detta problem. Det betyder bl.a.

Normally the operational amplifier is used as a component in active Filter design. The goal for future components in Filter design is large bandwith and the use of low supply voltages. The use of current-mode instead of voltage-mode circuits gets a step closer to the required performance. A component that use current as the signal conveying part is the current conveyor. In this report a comparative study between two current conveyor structures of second generation (CCII) is performed.

IIR-Filter är överlägsna traditionellt skapade FIR-Filter på många punkter. De klarar sig med en klart lägre ordning för att realisera ett Filter med samma egenskaper. En nackdel är däremot att filtret är klart känsligare för koefficient kvantisering och förlorar sina egenskaper när koefficienterna ändras, detta inträffar även om förändringen är liten. Genom den speciella struktur som vågdigitala Filter använder sig av kommer man runt detta problem. Det betyder bl.a.

I detta examensarbete presenteras två olika konstruktionslösningar för ett spegeldämpande Filter till en heterodynmottagare för L-bandet. Båda filtren är uppbyggda av distribuerade element i mikrostripsteknik. Filtertyper som behandlas är combline med kapacitansdioder för avstämning samt Filter med element av typen commensurate length transmissionsledning. Nödvändig teori om mikrostripteknik och distribuerade element behandlas. Konstruktionen av filtren beskrivs steg för steg från Filterkrav till färdig mönsterlayout.

The work describes the development of an adjustment algorithm that will replace today?s manual adjustment of Lead- and Lag-Filters at ABB Robotics industrial robots. The adjustment is mainly for the Filter parameters in the control system.Three different algorithms have been created to replace the manual adjustment. One of them is based on the criterion from the manual adjustment and another one on optimization of the sensitivity function. The last one is a combination of the two.The report describe the development of the algorithms and how they behave during simulations and tests on real robots.

This reports goal is the give BSR AB more information that's useful towards their customers in marketing of their products.It involves tests of different air Filters designed for cars and 3D-modelling of Opti-Flow systems. The three models thats being tested is SAAB (93SS), VAG (1.8T) and Volvo (S60). To every brand there are three different models. A orginal- , sport- and an open cone air Filter (Opti-Flow).The results indicate that the open Opti-Flow Filter has better performance compared to the other cased Filters. The sport Filters for SAAB and Volvo has better performance then the original Filter.

The purpose of this report is to evaluate different methods for identifying states in robot models. Both linear and non-linear Filters exist among these methods and are compared to each other. Advantages, disadvantages and problems that can occur during tuning and running are presented. Additional measurements from accelerometers are added and their use with above mentioned methods for state estimation is evaluated. The evaluation of methods in this report is mainly based on simulations in Matlab, even though some experiments have been performed on laboratory equipment.The conclusion indicates that simple non-linear models with few states can be more accurately estimated with a Kalman Filter than with an extended Kalman Filter, as long as only linear measurements are used.

Vid mixning i en hemmastudiomiljö finns det ofta stora akustiska problem, speciellt vid låga frekvenser. Vid just låga frekvenser orsakas problemen främst av stående vågor. För att reducera de stående vågorna används vanligen passiva absorbenter, men i en hemmastudiomiljö kan dessa av praktiska skäl ofta inte användas. I denna uppsats har något som kallas inversa Filter undersökts som möjligt alternativ. Dessa skapas från ett uppmätt rumsimpulssvar och appliceras på signalen till högtalaren genom faltning.

Vid mixning i en hemmastudiomiljö finns det ofta stora akustiska problem, speciellt vid låga frekvenser. Vid just låga frekvenser orsakas problemen främst av stående vågor. För att reducera de stående vågorna används vanligen passiva absorbenter, men i en hemmastudiomiljö kan dessa av praktiska skäl ofta inte användas. I denna uppsats har något som kallas inversa Filter undersökts som möjligt alternativ. Dessa skapas från ett uppmätt rumsimpulssvar och appliceras på signalen till högtalaren genom faltning.

Implementering av FIR Filter kan göras på olika sätt. I detta examensarbete har två olika varianter beskrivits med hjälp av VHDL, syntetiserats, simulerats och sedan jämförts med avseende på effektförbrukning..

In this thesis we compare how different strategies in choosing attribute values affects junk mail Filtering. We used two different variants of a naïve Bayesian junk mail Filter. The first variant classified an e-mail by comparing it to a feature vector containing all attribute values that were found in junk mails in the part of the e-mail collection we used for training the Filter. The second variant compared an e-mail to a feature vector that consisted of the attributes that was found in ten or more junk mails in the part of the e-mail collection we used for training the Filter. We used an e-mail collection that consisted of 300 e-mails, 210 of these were junk mails and 90 were legitimate e-mails.

Discharge of untreated wastewater leads to unnaturally high levels of nitrogen and phosphorus in rivers, lakes and the sea, which results in unbalanced ecosystems with eutrophication and lack of oxygen. Part of the phosphorus in surface waters is coming from on-site wastewater treatment from scattered households with unsatisfactory purification. Blast furnace slag is a by-product from iron production, and has in laboratory trials showed good phosphorus binding capacity. To test blast furnace slag as a reactive Filter media for phosphorus separation in a full scale experiment, a wastewater treatment plant has been built behind the picnic area at Ångersjön alongside the road E4 in central-eastern Sweden. The plant contains two parallel lines, one with blast furnaces slag and the other with Filtralite-P as phosphorus sorbent. Both Filters have showed decreasing phosphorus purification effect with time in spite of a low wastewater load.

The main purpose of this paper is to examine librarian's opinion of computer Filters, to bring order in the debate on these Filters and also to encourage future debate on this subject. The main problem is whether librarians themselves think they have the right to limit the public access to information on the Internet by using computer Filters. We will also see how many public libraries are using Filters, why they have chosen to use or not to use them, what is the librarians' opinion of Filters, what rules exist regarding the use of the Internet, and finally if it is legal to use Filter programs in public libraries. We have also included a short report on what Filters are and how they work. This paper deals only with Swedish conditions on a number of public libraries.