George S. Moschytz

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This paper presents a new approach to the adaptation of a wavelet filterbank based on perceptual and rate-distortion criteria. The system makes use of a wavelet-packet transform where each subband can have an individual time-segmentation. Boundary effects can be avoided by using overlapping blocks of samples and therefore switching bases is possible at(More)
Iterative decoding of high-performance error-correcting codes, such as turbo and related codes, is computationally demanding. This paper presents the application of a new type of analog computing network that enables the construction of all-analog decoders for such codes which outperform digital decoders in terms of speed and/or power consumption. The(More)
The authors show how continuous-time active-RC filters can be implemented in CMOS by replacing all resistors by MOSFETs operating in the linear region. As an example, a 24MHz active-MOSFET-C single-amplifier biquadratic lowpass filter with a pole-Q of 3 implemented in a 0.6 µ m CMOS process is discussed. By comparing measurements of a test chip, simulations(More)
This paper presents a method to decompose multichannel long-term intramuscular electromyogram (EMG) signals. In contrast to existing decomposition methods which only support short registration periods or single-channel recordings of signals of constant muscle effort, the decomposition software EMG-LODEC (ElectroMyoGram LOng-term DEComposition) is especially(More)
A new update equation for the general multichannel blind decon-volution (MCBD) of a convolved mixture of source signals is derived. It is based on the update equation for blind source separation (BSS), which has been shown to be an alternative interpretation [1] of the natural gradient applied to the minimization of some mutual information criterion [2].(More)
— It is shown that allpole filters of second-and third-order can be significantly desensitized to component tolerances by so-called impedance tapering, i.e., successively impedance-scaling upwards the L-sections of a resistance–capacitance ladder network in the forward and feedback path of a single-amplifier active filter. In order to obtain a realizable(More)