Eric Fragnière

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Analog electronic cochlear models need exponentially scaled filters. CMOS Compatible Lateral Bipolar Transistors (CLBTs) can create exponentially scaled currents when biased using a resistive line with a voltage difference between both ends of the line. Since these CLBTs are independent of the CMOS threshold voltage, current sources implemented with CLBTs(More)
This paper proposes a simple analogue electronic spiking neuron circuit, which can be used to create hardware models of biological neural systems. In spite of its simplicity, the circuit is able to simulate a variety of different neuron types. Measurements of the neuron model in various settings are compared with the physiological response of certain neuron(More)
Detection of the periodicity of amplitude modulation is a major step in the determination of the pitch of a sound. In this article we will present a silicon model that uses synchronicity of spiking neurons to extract the fundamental frequency of a sound. It is based on the observation that the so called ‘Choppers’ in the mammalian Cochlear Nucleus(More)
An analogue electronic model of a cochlea was developed some years ago by R. F. Lyon using a cascade of filters. Combined with an analogue gradient descent circuit, such an artificial cochlea can be used to extract the Linear Predictive Coding (LPC) of the speech signal in continuous time. We propose in this article an analogue VLSI circuit implementing a(More)
A 2-dimensional cochlear model offers several advantages over the usual 1-dimensional implementations. It allows to properly model the different modes of wave propagation through the cochlea. Furthermore, the number of filters per octave can be increased without increasing the delay along the cochlea, which is not possible with a 1dimensional model. Another(More)
Analog electronic cochlear models need exponentially scaled filters. CMOS Compatible Lateral Bipolar Transistors (CLBTs) can create exponentially scaled currents when biased using a resistive line with a voltage difference between both ends of the line. Since these CLBTs are independent of the CMOS threshold voltage, current sources implemented with CLBTs(More)
Conventional speech recognition systems require as input a sequence of acoustic vectors coding the relevant features of the speech signal. On the other hand the biological cochlea (inner ear) processes the speech signal to extract a neural coding suited for the higher levels of the brain. The background idea of this article is to interface an analogue(More)
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