Differential pulse-code modulation

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

We present a novel approach to enhance the performance of sampling-based model predictive control (MPC) in constrained optimization by leveraging products of experts. Our methodology divides the main problem into two components: one focused on optimality and the other on feasibility. By combining the solutions from each component, represented as distributions, we apply products of experts to implement a project - then - sample strategy. In this strategy, the optimality distribution is projected into the fea

To function in uncertain environments, we need to constantly update our internal model of the world. Sensory prediction errors are thought to drive these updates. EEG studies indicate that uncertainty affects neural correlates of prediction errors. It is unclear how uncertainty of the environment modulates prediction error responses in individual neurons. Here, we exposed awake head-restrained mice to sounds followed by tactile stimuli that were either fixed or variable in intensity, making them more or les

Different approaches to implement unipolar Golay coding in Brillouin optical time-domain analysis based on a differential pulse pair (DPP) are investigated. The analysis points out that dedicated post-processing procedures must be followed to secure the sh ...

A hybrid Golay coding method based on differential pulse-pair sequences is proposed for distributed Brillouin sensing. The method provides 1.5 dB signal-to-noise ratio improvement over unipolar Golay with halved measurement time, securing high spatial reso ...

We present a 3D-printing technology allowing free-form fabrication of centimetre-scale injectable structures for minimally invasive delivery. They result from the combination of 3D printing onto a cryogenic substrate and optimisation of carboxymethylcellul ...

The generation of pulses in dual-pump fiber optical parametric amplifier is investigated. Theoretically, it is shown that in an analogical manner to pulse generation in single-pump fiber optical parametric amplifiers, the generated pulse shape depends on the linear phase mismatch between the interacting waves. However the dual-pump architecture allows for the bounding of the phase mismatch over a wide bandwidth. This feature permits the generation of uniform pulses over a wide bandwidth, contrary to the sin

The growing use of multicore and networked computing systems is increasing the importance of developing reliable parallel and distributed code. Unfortunately, developing and testing such code is notoriously hard, especially for shared-memory models of programming. The actor model offers a promising alternative paradigm based on message passing. Essentially, an actor is an autonomous concurrent object which interacts with other actors only by exchanging messages. In actor-based systems, the key source of non

In this paper we introduce a method for analyzing the performance of coded modulation schemes based on iterated chaotic maps. In particular, it is known from coding theory that the minimum distance plays an important role, defining the behavior of the error probability performance at sufficiently high signal to noise ratios. We introduce the method and illustrate it for two examples of chaotic maps, the Bernoulli shift map and the tent map. We emphasize that the performance of the map can not be understood

In this paper, the authors examine the use of chaotic systems based on the iteration of 1-D and 2-D piecewise linear chaotic maps in a coded modulation scheme. In the proposed scheme, the transmitted information is imposed on the dynamics of the chaotic systems by a small perturbation control method. By means of this control method, the system is driven in such a way that the symbolic sequence associated with the produced signal corresponds to the payload information, up to a possible coding delay. We inves

Recently it has been observed that communications using chaos show best performance if the information production related to the chaos in the transmitter is controlled and used for the payload of the communication \cite{Schimming:Nolta:2002}. In the case of one-dimensional Markov maps, this can be achieved by controlling the chaotic system by means of small perturbations. In particular, the perturbations are applied in such a way that the generated (natural) symbolic sequence follows the information signal.

An analytical model is proposed that can predict the shape of the poststimulus time histogram (PSTH) response to a current pulse of a neuron subjected to uncorrelated background input. The model is based on an explicit description of noise in the form of an escape rate and corresponding hazard function. Two forms of the model are presented. The full model is nonlinear and can be integrated numerically while a linearized version, while the linearized version can be solved analytically. In the linearized vers

In this paper, we introduce a novel technique for adaptive scalar quantization. Adaptivity is useful in applica- tions, including image compression, where the statistics of the source are either not known a priori or will change over time. Our algorithm uses previously quantized samples to estimate the distribution of the source, and does not require that side information be sent in order to adapt to changing source statistics. Our quantization scheme is thus backward adaptive. We propose that an adaptive q

Two methods, based on the phase modulation of spin-echo signals due to J-coupling, of selective simplification of coupled homonuclear spectra are described. Both pulse methods employ a 90 Deg-t-180 Deg-t spin-echo sequence to prep. suitable phases of the magnetization in the rotating frame. For t = (4J)-1, all doublet magnetization vectors have opposite phases, parallel to the phase of the initial pulse. The 1st method uses a single 45 Deg pulse, with a phase F alternating between +y and -y and addn. of the

Differential pulse-code modulation

Chat with Graph Search

Sampling-based constrained motion planning with products of experts

Differential modulation of positive and negative prediction errors by stimulus variability in the mouse posterior parietal cortex

Hybrid Golay-coded Brillouin optical time-domain analysis based on differential pulses

Hybrid Coding Scheme for Brillouin Optical Time-domain Analysis Based on Golay and Differential Pulses

Additive manufacturing of hierarchical injectable scaffolds for tissue engineering

Wideband generation of pulses in dual-pump optical parametric amplifier: theory and experiment

State Exploration of Scala Actor Programs

Minimum distance properties of coded modulations based on iterated chaotic maps

Coded modulations based on controlled 1-D and 2-D piecewise linear chaotic maps

Coded Modulations Using Chaotic Systems Controlled by Small Perturbations

Noise and the PSTH response to current transients: I. General theory and application to the integrate-and-fire neuron

Adaptive scalar quantization without side information

Selective removal of magnetization in coupled NMR spectra