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Université de Neuchâtel

An Algorithm for Fast Direct Calculation of Quantized LSP Parameters

Grassi, Sara ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the Fifth Bayona Workshop on Emerging Technologies in Telecommunications (COST 254), 1999, p. 158-162

Line Spectrum Pairs (LSP) are commonly used in speech coding for spectral quantization. Usually, the LSPs are first calculated, and then quantized. When scalar quantization is used, computational saving can be achieved by direct calculation of the quantized LSPs, searching zero-crossings on the grid formed by the values of the quantization tables (quantized-domain search). In a previous...

Université de Neuchâtel

Design on Lattice Wave Digital Filters in SPW Environment

Grisoni, L. ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International Conference on Signal Processing, Applications and Technology (ICSPAT), 1993, p. 311-319

Lattice Wave Digital Filters (LWDFs) are known to be insensitive to finite precision arithmetic effects and can readily be designed for standard filtering applications using a set of explicit formulas elaborated by Gazsi. This paper presents the necessary elements to develop an LWDF design package within the Signal Processing Workstation (SPW) design framework. This package, based on Gazsi's...

Université de Neuchâtel

A Numerical Minimization of Perceptual Error for the Linear Chromatic Adaption Transform

Costantini, Roberto ; Ansorge, Michael ; Bracamonte, Javier ; Pellandini, Fausto

In: Proceedings of First European Conference on Colour in Graphics, Imaging, and Vision (CGIV), 2002, p. 164-169

In this paper,new sensors for the chromatic adaptation transform (CAT)are found.They have been obtained by the independent numerical minimization of 6 perceptual error metrics over 16 corresponding color pair (CCP)data sets,including Lam's set,using as starting point for the minimization 4 known and commonly used sensors.An analysis of their performances has shown that the best performance is...

Université de Neuchâtel

Rem, Frank J. - Power Estimation Techniques for the Purpose IEEE ProRISK 1997.pdf

Rem, Frank J. ; Gerez, Sabih H. ; Smit, Jaap ; Heubi, Alexandre ; Ansorge, Michael ; Pellandini, Fausto

In: IEEE ProRISC Workshop on Circuits, Systems and Signal Processing, 1997, p. 415-422

Architectural synthesis for digital signal processing (DSP) is the automatic generation of a VLSI implementation of a DSP algorithm. In this process, it is desirable to estimate the power consumption of potential solutions. The estimation should be fast and accurate. The dual-bit-type estimation method known from literature was taken as a basis and adapted for the goals of this research....

Université de Neuchâtel

A Low-Jitter and Low-Power CMOS PLL for Clock Multiplication

Shi, Xintian ; Imfeld, Kilian ; Tanner, Steve ; Ansorge, Michael ; Farine, Pierre-André

In: IEEE Esscirc - Mixed Signal, High Voltage & High Power Circuits, 2006, vol. 7, p. 174-177

This paper describes a phase-locked loop (PLL) designed for clock multiplication in a LVDS transmitter. The PLL consists of a novel low-jitter charge-pump, a fully differential ring-oscillator based VCO, a dynamic-logic PFD, a 2nd order passive loop filter and a digital frequency divider. The PLL exhibits simultaneously low jitter and low power consumption. It has been integrated into a 0.35 µm...

Université de Neuchâtel

Effective static response compensation suitable for low-power ASIC implementation with an application to pressure sensors

Berthoud, Christophe ; Ansorge, Michael ; Pellandini, Fausto

In: Instrumentation and Measurement Technology Conference (IMTC). Conference Proceedings. 'Quality Measurements : The Indispensable Bridge between Theory and Reality'., 1996, vol. 2, p. 1168 - 1173

This paper presents an efficient all-digital compensation technique for sensors measuring static or slowly-varying quantities such as pressure. The proposed solution compensates the temperature dependencies and further non-linearities affecting the accuracy and measurement range of the sensors. In addition, for the considered pressure sensors, the trimming that is usually performed in factory can...

Université de Neuchâtel

Automatic sound detection and recognition for noisy environment

Dufaux, Alain ; Besacier, Laurent ; Ansorge, Michael ; Pellandini, Fausto

In: IEEE European Signal Processing Conference EUSIPCO, 2000, vol. 10, p. 1-4

This paper addresses the problem of automatic detection and recognition of impulsive sounds, such as glass breaks ,human screams, gunshots, explosions or door slams. A complete detection and recognition system is described and evaluated on a sound database containing more than 800 signals distributed among six different classes. Emphasis is set on robust techniques, allowing the use of this...

Université de Neuchâtel

Design Methodology for VLSI Implementation of Image and Video Coding Algorithms – A Case Study

Bracamonte, Javier ; Ansorge, Michael ; Pellandini, Fausto

In: Intelligent Methods in Signal Processing and Communications, 1997, vol. 14, p. 1-20

In this chapter a methodology for the design of VLSI circuits for image and video coding applications is presented. In each section a different phase of th edesign procedure is discussed, along with a description of the involved software environments. An example of an area efficicient single-chip implementation of a JPEG coder is presented to illustrate the methodology.

Université de Neuchâtel

LSP calculation methods for application to speech coding

Grassi, Sara ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of Signal Processing Workshop (SPW), 1999, p. 61-66

Line spectrum pair (LSP) parameters are commonly used in speech coding for quantization of the speech spectral envelope. Unfortunately, the high computational complexity in the calculation of the LSP is a drawback for both real-time implementation and application in low-power portable devices. In this paper, some techniques for reducing computational complexity of the LSP calculation are given....