Decorrelation in Adaptive Feedback Cancellation for Public Address Systems

Public Address systems that include a setup with at least one microphone and speaker can suffer from acoustic feedback. This results in an annoying howling effect which can damage hardware and human hearing. To solve this issue, an adaptive filter that estimates the feedback path and uses this estimate to cancel the feedback can be designed....

Adaptive filtering in adaptive feedback cancellation for PA systems

This report is written as part of the Bachelor Graduation Project in the third year of the Electrical Engineering Bachelor programme at the Delft University of Technology. This report is made by a subgroup that is part of a larger project dedicated to finding a solution to frequency feedback in electroacoustic systems, also known as the Larsen...

Postfiltering in Adaptive Feedback Cancellation for PA Systems

The most promising method for acoustic feedback control in public address systems is adaptive feedback cancellation (AFC). This approach is based on making an estimation of the room impulse response, which is used to subtract an estimate of the feedback from the microphone signal. A postfilter is often used to improve the performance of such an...

Bachelor Graduation Project Tracheo-esophageal speech enhancement: Input and filter

Every year an unfortunate part of the population lose their larynx, often due to the consequences of cancer. The laryngectomy removes the possibility to speak. Fortunately several speech reinstatement techniques have been found. However, all current speech reinstatement techniques do not produce a lot of volume. As a result the laryngectomised...

Filtration of natural organic matter and micro pollutants

This study discusses the filtration of micro-pollutants and natural organic matter<br/>from water by a granular activated carbon filter. To determine the efficiency of a<br/>filter, simulations are run to predict it’s efficiency. This study will describe a demo application and it’s underlying model that are used to determine the efficiency of a...

Noise Statistics Estimation based on adaptive filtering

At virtually every public venue, announcements for visitors are made via a public addressing system. It is important that announcements transmitted by means of a public addressing system are not only audible, but also well understood by the general public. This thesis covers one of three subsystems required to make<br/>a product that is capable...

Magnetic Field Measurements in Multi-Beam Deflector Array

The Wien filter is an important part in the multi-beam inspection microscope that is being developed at the Imaging Physics research group at the TU Delft. The multi-beam inspection microscope uses an array of 20x20 parallel beams with a pitch of 1mmthat scan the sample simultaneously. This way the low throughput of current scanning electron...

GPS Location Tracker: Collecting data for sports visualisation

A start-up creates videos which users can watch to experience their running or cycling activity all over again. Currently, the company depends on external data sources to generate a video. To be less dependent on these sources the company wants to create their own tracking solution. This solution has to fit in their existing smartphone...

Designing an Innovative Brake Control System

Current trailers and caravans use overrun brakes, which cause overheated brakes in the mountains. A solution is to design an electric brake system in which the brakes are controlled electronically instead of mechanically. The report discusses the control models associated with braking, anti-sway detection and velocity sensor fusion. The RDW...

Swarm robot localization from noisy distance measurements

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Real-Time Resource Management: An investigation of Kalman Filtering techniques

The use of sensor measurement data in mines today is usually limited to the downstream processing of mined material in a feed-forward loop. This thesis investigates the capability of Kalman Filtering techniques in updating resource models, based on sensor data, in a feed-back sense. The mining operation and updating process are simulated in...

CHAINels: Journal

A group of three students worked a couple of months at CHAINels for their computer science bachelor project. In these months a recommendation algorithm was designed and implemented in CHAINels. The recommendation algorithm recommends posts to a company and those posts are shown in the Journal which was also made during this project. In this...

Signaalbewerking in een 7 Tesla MRI omgeving

7T MRI-scanners kunnen met de huidige technieken nog niet nauwkeurig genoeg getriggerd worden voor het uitvoeren van scans van hoge kwaliteit. In opdracht van het LUMC is er daarom een project opgestart om een systeem te ontwerpen dat biomedische signalen kan meten, verwerken en versturen om de 7T MRI-scanner te kunnen triggeren. Er zijn drie...

De Erasmusladder: Versterking en uitlezing van analoge tweedimensionale metingen van verplaatsing

Om te zorgen dat tweedimensionale metingen naar de verplaatsing van een muis voldoende nauwkeurige informatie oplevert, en aansluit op de huidige Erasmusladder, is gekozen voor een oplossing met sensoren met LED's en fotodiodes. Een systeem is ontworpen en gerealiseerd om de signalen eerst te versterken en te filteren. Een tweede systeem zorgt...

Procedural Filters

Tributing to the GATE project by TNO, this application was designed to create an extra layer between the project and 3D modelling artists. New users are now able to place procedural content in their 3D worlds, without knowing much of the environment or programming. A general filter can be created to apply to the environment, without knowing...