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Koch, R.C.N. (author)After looking at properties of speech and existing speech coding algorithms, a proposal for a new asymmetric speech coding algorithm is done. An asymmetric algorithm is a system in which the decoder is significantly simpler than the encoder. The purpose of this asymmetry is to exchange encoding delay for a decrease in bitrate. These algorithms...master thesis 1991
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Van der Vleuten, R.J. (author)This thesis concerns the efficient transmission of digital data, such as digitized sounds or images, from a source to its destination. To make the best use of the limited capacity of the source-destination channel, a source coder is used to delete the less significant information. To correct the occurring transmission errors, a channel coder is...doctoral thesis 1994
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- van der Vleuten, R.J. (author) doctoral thesis 1994
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Shterev, I.D. (author), Lagendijk, I.L. (author), Heusdens, R. (author)Quantization-based watermarking schemes are vulnerable to amplitude scaling. Therefore the scaling factor has to be accounted for either at the encoder, or at the decoder, prior to watermark decoding. In this paper we derive the marginal probability density model for the watermarked and attacked data, when the attack channel consists of...conference paper 2004
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Shterev, I.D. (author), Lagendijk, R.L. (author)Quantization-based watermarking schemes comprise a class of watermarking schemes that achieves the channel capacity in terms of additive noise attacks.1 The existence of good high dimensional lattices that can be efficiently implemented2–4 and incorporated into watermarking structures, made quantization-based watermarking schemes of practical...conference paper 2005
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Wang, J. (author), Shterev, I.D. (author), Lagendijk, R.L. (author)This paper presents a scheme for estimating two-band amplitude scale attack within a quantization-based watermarking context. Quantization-based watermarking schemes comprise a class of watermarking schemes that achieves the channel capacity in terms of additive noise attacks1. Unfortunately, Quantization-based watermarking schemes are not...conference paper 2006
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Østergaard, J. (author)In this thesis we construct and analyze index-assignment based multiple-description coding schemes.doctoral thesis 2007
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Rizvi, U.H. (author), Janssen, G.J.M. (author), Weber, J.H. (author)In this letter, closed-form expressions for the bit error rate of M-ary pulse amplitude modulated signal constellations as a function of the analog-to-digital converter word length, the signal-to-noise ratio and the fading distribution, are derived. These results allow for a rapid and accurate evaluation of the system performance when the analog...journal article 2009
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Borchert, S. (author)The main focus of video encoding in the past twenty years has been on video broadcasting. A video is captured and encoded by professional equipment and then watched on varying consumer devices. Consequently, the focus was to increase the quality and to keep down the decoder complexity. In more recent years we observe a shift in user behavior,...doctoral thesis 2010
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Zhang, H. (author)For energy management in wireless sensor networks, only the sensors with most informative measurements are activated to operate. How to select sensors that make good tradeoff between performance and energy consumption is what many researchers are focusing on. Existing solutions assume analog data model, i.e., the data from sensors collected by a...master thesis 2015
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Amini, J. (author), Hendriks, R.C. (author), Heusdens, R. (author), Guo, M. (author), Jensen, Jesper Rindom (author)Multi-microphone noise reduction algorithms in binaural hearing aids which cooperate through a wireless link have the potential to become of great importance in future hearing aid systems. However, limited transmission capacity of such devices necessitates the data compression of signals transmitted from one hearing aid to the contralateral one....conference paper 2016
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Schellekens, D.H.M. (author)Nowadays, large-scale networks of computing units, often characterized by the absence of central control, have become more commonplace in many applications. To facilitate data processing in these large-scale networks distributed signal processing is required. The iterative behaviour of distributed processing algorithms combined with the limited...master thesis 2016
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Buijtendorp, B. (author)We develop a computational method that can efficiently simulate Landau levels in quantum heterostructures, by reducing the problems dimensionality. We then apply this to a GaSb/InAs/AlSb broken gap quantum well in the trivial and inverted regimes. This heterostructure can be tuned into a 2DTI phase, and has possible applications in topological...bachelor thesis 2016
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Sonmez, U. (author), Sebastiano, F. (author), Makinwa, K.A.A. (author)VCO-based phase-domain ΣΔ modulators employ the combination of a voltage-controlled-oscillator (VCO) and an up/down counter to replace the analog loop filter used in conventional ΣΔ modulators. Thanks to this highly digital architecture, they can be quite compact, and are expected to shrink even further with CMOS scaling. This paper describes...journal article 2017
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D'Urbino, M. (author)This work presents an architecture capable of digitizing every channel of an ultrasound transducer array independently and simultaneously. This feature is achieved by exploiting the frequency response of the piezoelectric transducer in order to save area and reduce to a minimum the required building blocks of the ADC. The transducer is used as...master thesis 2017
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Moustakis, Nikolaos (author)Major advancements over the last few decades in communication networks gave rise to the<br/>new paradigm of Networked Control Systems (NCSs). Within this paradigm, sensing and<br/>actuation signals are exchanged among various parts of a single system or among many<br/>subsystems via communication networks. Although this enables one to perform...master thesis 2017
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Jonkman, Jake (author)Recently, the effects of quantization on the Primal-Dual Method of Multipliers were studied.<br/>In this thesis, we have used this method as an example to further investigate the effects of quantization on distributed optimization schemes in a much broader sense. Using monotone operator theory, the effect of quantization on all distributed...master thesis 2017
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Fadaly, E.M.T. (author), Zhang, H. (author), Conesa Boj, S. (author), Car, D. (author), Gül, Önder (author), Plissard, Sébastien R. (author), op het Veld, R.L.M. (author), Kölling, Sebastian (author), Kouwenhoven, Leo P. (author), Bakkers, E.P.A.M. (author)Majorana zero modes (MZMs) are prime candidates for robust topological quantum bits, holding a great promise for quantum computing. Semiconducting nanowires with strong spin orbit coupling offer a promising platform to harness one-dimensional electron transport for Majorana physics. Demonstrating the topological nature of MZMs relies on...journal article 2017
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Fu, A. (author), Mazo, M. (author)Asynchronous decentralized event-triggered control (ADETC) Mazo Jr. and Cao (2014) is an implementation of controllers characterized by decentralized event generation, asynchronous sampling updates, and dynamic quantization. Combining those elements in ADETC results in a parsimonious transmission of information which makes it suitable for...journal article 2018
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Moustakis, N. (author), Yuan, S. (author), Baldi, S. (author)This paper establishes an adaptive tracking approach for linear systems with parametric uncertainties, when input measurements are quantized due to the presence of a communication network closing the control loop. In order to address the tracking problem, a novel dynamic quantizer with dynamic offset is introduced and embedded into an...conference paper 2018