Evaluation of feedback generated from agent-based social skills training systems: A qualitative analysis on the comprehensibility, usability, and improvement points of the generated feedback

Chatbots are tools that can potentially be utilized in chat-based child helpline training. In this type of training, the quality of the feedback received is of vital importance. This paper aims to analyze the automated feedback generated by such a chatbot. The domains analyzed include user comprehension, usefulness, and potential improvement...

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...

Digital implementation of motional feedback in a bass loudspeaker

This thesis report focuses on possible methods of digital implementation of motional feedback in a bass loudspeaker. In this thesis, the control system will be created for a monopole and a dipole speaker specifically. It does so by sketching the outlines of such a system and examining possible designs for the components required to suppress...

Amplifier design for an implementation of motional feedback in a bass loudspeaker

The displacement of a loudspeaker cone is not linearly proportional to the voltage/current at its input provided. This is due to electrical and mechanical limitations. The distortion is more noticeable at lower frequencies. This report is one of two reports, that will explain how to minimize this distortion. The motion of the loudspeaker cone...

AuTA: Automatic teaching assistant

Due to the dramatic increase in enrollments in the TU Delft Bachelor of Computer<br/>Science, the workload for teaching assistants and instructors has skyrocketed. To<br/>reduce this workload, automated tools can be used to make the grading process easier. This paper describes the development of AuTA (Automatic Teaching Assistant), a tool that...

SoftGlove: Finger Force Feedback

Virtual reality gear is in the early stages of public use. A recent development is the use of haptic feedback gloves to improve immersion. This report describes some of the challenges in this field. The finger force feedback subsystem design of the SoftGlove is discussed including all methods used and measurements done to accomplish an optimal...

SoftGlove: Finger Vibrotactile Feedback

In this report the finger vibrotactile subsystem of the SoftGlove wearable haptic feedback glove is discussed. This system is an upgrade over the vibrotactile feedback that the current SenseGlove haptic feedback glove provides. The designed system consists of a linear resonant actuator (LRA) on each finger, which is controlled by a dedicated LRA...

Softglove: Vibrotactile palm feedback

VR gear is in the early stages of public use. A recent development is the use of haptic feedback and gloves to improve the immersion. This reports describes some of the challenges in this field, methods to stream haptic feedback in the form of audio, potential haptic protocols and contains the design process of a haptic feedback glove for...

Motional Feedback Control for Bass Loudspeakers: Subgroup Theory

The aim of this research is to create a nonlinear model of a loudspeaker to analyze the open-loop distortion as well as the closed loop performance with linear and nonlinear controllers. A method is proposed for measuring the dominant nonlinear parameters of a loudspeakers. Furthermore, the loudspeaker distortion is both measured experimentally...

Motional Feedback in a Bass Loudspeaker: Analogue Implementation

This thesis is part of the Bachelor Graduation Project of Electrical Engineering at Delft University of Tech-nology. This contains the complete design process of an analogue implementation of a Motional Feedbackcontroller. Although the complete controller has been designed, no significant test results have yet beenacquired. However,...

Amplifier Design in a Motional Feedback System

The quality of audio amplifiers used in Hi-Fi sound installations is largely determined by the distortion of the output signal. This report proposes a method of improving the distortion reduction in audio amplifiers by using a topology with active feedback. The characteristics of the standard non-inverting amplifier are extended to this new...

Real-time haptische terugkoppeling aan schaatsers: Gebruik makend van een draadloze actuatormodule

De GonioTrainer is een draagbaar apparaat dat schaatsers helpt bij het verbeteren van hun schaatstechniek. In deze thesis wordt een manier besproken om het huidige prototype van de GonioTrainer te verbeteren en real-time terugkoppeling te geven naar de schaatser, middels een trilmotor die draadloos wordt aangestuurd. Belangrijke eigenschappen...

De memristor in feedback control systemen - The memristor in feedback control systems

In 2008 Hewlett-Packard requested a patent on a passive memristive device, which caused the memristor to become a popular area of research again. This thesis focuses on the mathematical derivation and definition of a memristor and how we can incorporate such a memristor in a feedback control system. We determine the describing function of a...