Noise filtering of image sequences

Reducing frequency offset within a EUROFIX receiver using asynchronous uniform sampled LORAN-C pulses

EUROFIX is a new proposed system in which the LORAN-C navigation system is altered slightly to transmit DGPS data. This system is tested at the Telecommunications and Traffic Control Systems Group by using an atomic clock for precision timing measurements. Within the EUROFIX project an investigation is conducted to see if groundwaves as well as...

Overlapped Transform Coding of Images: Theory, Application and Realization

Effective reverse conversion in residue number system processors

A seismic-inspired denoising method for online recorded music

In this work, a novel subspace-based algorithm is presented for automated random noise reduction in online recorded music. Musical signal enhancement is a separate issue from the well-studied speech enhancement problem due to the particularly wide range of signal characteristics encountered, and thus requires a very general approach. Because...

Time-resolved gamma spectroscopy of single events

In this article we present a method of characterizing scintillating materials by digitization of each individual scintillation pulse followed by digital signal processing. With this technique it is possible to measure the pulse shape and the energy of an absorbed gamma photon on an event-by-event basis. In contrast to time-correlated single...

Into darkness: From high density quenching to near-infrared scintillators

In many aspects measurement of the α/β ratio has advantages over other methods. It provides higher precision and higher density of excitation than is available with Compton or photoelectric effect electrons. It has been shown that the α/β ratio follows the same trends and patterns as previously found for nonproportionality of electron/ gamma...

Dispersion and Nonlinearity Identification for Single-Mode Fibers Using the Nonlinear Fourier Transform

Efficient fiber-optic communication requires precise knowledge of the fiber coefficients, but these often change over time due to factors such as aging or bending. We propose a novel algorithm that identifies the average second-order dispersion and Kerr nonlinearity coefficient of a fiber, without employing any special training signals....

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....

A hybrid approach to structural modeling of individualized HRTFs

We present a hybrid approach to individualized head-related transfer function (HRTF) modeling which requires only 3 anthropometric measurements and an image of the pinna. A prediction algorithm based on variational autoencoders synthesizes a pinna-related response from the image, which is used to filter a measured head-andtorso response. The...

Deep Neural Network-Based Digital Pre-distortion for High Baudrate Optical Coherent Transmission

High-symbol-rate coherent optical transceivers suffer more from the critical responses of transceiver components at high frequency, especially when applying a higher order modulation format. Recently, we proposed in [20] a neural network (NN)-based digital pre-distortion (DPD) technique trained to mitigate the transceiver response of a 128...

Robust Algorithm for Signal Digital Detection on the Background of Non-Gaussian Passive Interferences

This paper proposes generalized mathematical model of different passive interferences and develops an effective algorithm of digital signal processing for detection on the background of them. Models of interferences as random process of K-distribution is used with parametrization for the unwanted reflections from atmosphere, land, and sea....

Digital Signal Processing for a Wireless ECG Device: Wireless Electrocardiogram (WiECG)

The goal of the WiECG project is to create a prototype device that makes it possible to perform a 12-lead ECG measurement on patients without wires from the patient to a monitor. The solution consists of a transmitter and receiver, one of which is close or on the patients body and the other is connected to a monitor.<br/><br/>This thesis...

Blind Polarization Demultiplexing of Shaped QAM Signals Assisted by Temporal Correlations

While probabilistic constellation shaping (PCS) enables rate and reach adaption with finer granularity [1] (Cho and Winzer, 2009), it imposes signal processing challenges at the receiver. Since the distribution of PCS-quadrature amplitude modulation (QAM) signals tends to be Gaussian, conventional blind polarization demultiplexing algorithms...