Marc Ihle

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In [1] and [2] the author presented for the first time a differential microphone array, which is used to calculate an accurate estimate of the power spectral density (PSD) of the ambient noise – excluding the desired signal – and the PSD estimate of the noisy input signal – including the desired signal and the ambient noise. With both PSD estimates(More)
—Artificial lighting is a main source of interference on free space photoelectric systems for communication applications. This work presents digital measurements and numerical analysis of the time and frequency characteristics of artificial lighting interference using Welch Power Spectral Density estimate and spectrogram with Short Time Fourier Transform.(More)
A robust short-range wireless optical communication system with direct sequence spread spectrum modulation and additional interference suppression is presented. The real-time system is implemented on a DSP/FPGA development board. The intensity modulation and direct detection system is designed to operate in the wireless optical indoor channel under strong(More)
In this paper we describe a noise reduction preprocessing algorithm for the adaptive multirate (AMR) speech codec of the GSM system. The algorithm is based on spectral weighting and explicitly takes into account the properties of the human auditory system. The weighting rule results in the smallest possible speech distortion under the constraint that the(More)
—In this paper, Finite Rate of Innovation (FRI) is applied to time domain reflectometry and it is aimed at significantly reducing the data acquisition requirements. The sensitivity of FRI to quantisation noise is addressed given the stringent practical constraints on the resolution of the deployed analogue to digital converters in miniature reflectometry(More)
We consider the problem of sampling non band limited signals with a finite number of degrees of freedom, i.e. non uniform splines or piecewise polynomials. These signals are typically called signals with finite rate of innovation (FRI). We propose a novel technique for perfectly reconstructing impulses of Diracs. These Diracs are our adopted non band(More)
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