Signal Processing for Brain-Machine Interfaces (2009)
Justin C. Sanchez, Jose C. Principe, Toshikazu (toshi Nishida, Rizwan Bashirullah, John G. Harris
[The need for “beyond state-of-the-art ” tools] Neural interfaces hold the promise to become one of the great technological advancements of the 21st century because they can provide new means of...
IMPROVING THE FILTER BANK OF A CLASSIC SPEECH FEATURE EXTRACTION ALGORITHM (2008)
Mark D. Skowronski, John G. Harris
The most popular speech feature extractor used in automatic speech recognition (ASR) systems today is the mel frequency cepstral coefficient (mfcc) algorithm. Introduced in 1980, the filter...
An Asynchronous Delta-Sigma Converter Implementation (2008)
Dazhi Wei, Student Member Ieee, Vaibhav Garg, Student Member Ieee, John G. Harris, Member Ieee
Abstract — In this paper an architecture, signal reconstruction algorithm and first-ever implementation of an asynchronous delta-sigma converter are presented. The signal reconstruction algorithm...
2. COUPLED OSCILLATOR USING (2008)
A CMOS neural oscillator using negative resistance has An ideal coupled oscillator using two operational been designed and fabricated in an AMI OSum double transconductace amplifiers (OTAs) and two...
automated intelligibility enhancement in noisy environments (2008)
Mark D. Skowronski, John G. Harris
Applied principles of clear and Lombard speech for
Conductivity Dependence of Seismoelectric Wave Phenomena in Fluid-Saturated Sediments (2008)
Gareth I. Block, John G. Harris
Abstract: Seismoelectric phenomena in sediments arise from acoustic wave-induced fluid motion in the pore space, which perturbs the electrostatic equilibrium of the electric double layer on the grain...
A Closed Form Solution for Multiple-Input Spike Based Adaptive Filters (2008)
Il Park, José C. Príncipe, John G. Harris
Abstract — Neurons are point process systems, in the sense that the inputs and output which are spike trains can be treated as point processes. System identification of a point process system has...
The Combined LMS/F Algorithm (2007)
Shao-jen Lim, John G. Harris, John G. Harris
A new adaptive filter algorithm has been developed that combines the benefits of the Least Mean Square (LMS) and Least Mean Fourth (LMF) methods. This algorithm, called LMS/F, outperforms the...
An Analog Implementation of the Constant Statistics Constraint For Sensor Calibration (2007)
John G. Harris, Yu-ming Chiang
We use the constant statistics constraint to calibrate an array of sensors that contains gain and offset variations. This algorithm has been mapped to analog hardware and designed and fabricated with...
Jui-kuo Juan, John G. Harris, Jose C. Principe
We have implemented a four-tap adaptive filter in a continuous-time analog VLSI circuit. Since an ideal delay is impossible to implement in continuous-time hardware, we implemented the delay line as...
Analog models for early vision (2007)
Analog models provide a novel framework for understanding and developing algorithms for computer vision. This thesis introduces several extensions to well-known resistive network techniques for...
A pulse-based feature extractor for spike sorting neural signals (2007)
Christy L. Rogers, John G. Harris, Jose C. Principe, Justin C. Sanchez
Spike sorting, which isolates the activity of single neurons, is often needed to analyze extracellular neural recordings. Wave shape analysis in the spike sorting procedure provides a means to detect...
wireless implantable recording electrodes (FWIRE) for brain machine interfaces (2007)
Rizwan Bashirullah, John G. Harris, Justin C. Sanchez, Toshikazu Nishida, Jose C. Principe
Abstract — This paper reviews on-going efforts towards the development
Disordered Speech Assessment Using Automatic Methods Based on Quantitative Measures (2005)
Lingyun Gu, John G. Harris, Rahul Shrivastav, Christine Sapienza
Speech quality assessment methods are necessary for evaluating and documenting treatment outcomes of patients suffering from degraded speech due to Parkinson's disease, stroke, or other disease...
Disordered Speech Assessment Using Automatic Methods Based on Quantitative Measures (2005)
Lingyun Gu, John G. Harris, Rahul Shrivastav, Christine Sapienza
Speech quality assessment methods are necessary for evaluating and documenting treatment outcomes of patients suffering from degraded speech due to Parkinson's disease, stroke, or other disease...
Ecient Object Recognition Using Color (2001)
Signe Redfield Michael, Michael Nechyba, John G. Harris, Antonio A. Arroyo
A real-time prototype system for identifying soda cans uses histogram indexing with only 16 colors, with excellent results. The final implementation identified cans almost perfectly, even on public...
The Coupled Depth/Slope Approach to Surface Reconstruction. (1998)
Reconstructing a surface from sparse sensory data is a well known problem in computer vision. Early vision modules typically supply sparse depth, orientation and discontinuity information. The...
Coupled Elastic Surface Wave in Curved Structures (1998)
A mathematical description of coupled. surface-wave propagation in elastic waveguides whose properties change slowly in the lateral or transverse directions has been constructed. This construction...
Matthew D. Rowley, John G. Harris
Abstract: A comparison is made between three architectural models used for edge detection in;Init-log VLSI early vision systems. In analog VLSI com-putational networks, signal strength is a paramount...
Analog Hardware Implementation of Continuous-Time Adaptive Filter Structures (1997)
John G. Harris, Jui-kuo Juan, Jose C. Principe
We have implemented a four-tap adaptive filter in a continuous-time analog VLSI circuit. Since an ideal delay is impossible to implement in continuous-time hardware, we implemented the delay line as...
Adaptive Scale Detection (1997)
Dongwei Chen, John G. Harris, Andrew Laine
Most image processing and computer vision algorithms assume knowledge of the proper spatial scale in the image. We propose an automatic technique that adaptively sets the proper spatial scale based...
Delay Lines Using Self-Adapting Time Constants (1997)
Transversal filters using ideal tap delay lines are a popular form of short-term memory based filtering in adaptive systems. Some applications where these filters have attained considerable success...
A Chaotic Oscillator Cell in Subthreshold CMOS for Spatio-Temporal Simulation (1996)
John E. Neeley, John G. Harris
This paper reports on the design and experimental results of a subthreshold-CMOS chaotic oscillator suitable for single-chip VLSI synthesis of coupled maps generating spatio-temporal chaos. The...
Modeling the Precedence Effect for Speech (1996)
Odelia Schwartz, John G. Harris, Jose C. Principe
The human auditory system is capable of perceiving the direction of a sound source despite reflections off of walls, ceiling and other interfering objects. This phenomenon, the precedence effect, has...
A Subthreshold-CMOS Chaotic Oscillator (1996)
John E. Neeley, John G. Harris
This paper reports on the design of a subthreshold-CMOS chaotic oscillator based on Chua's circuit. The circuit is autonomous and generates chaotic signals from three state variables in a manner...
The Silicon Vocal Tract (1996)
Kevin M. Jones, John G. Harris
An analog VLSI circuit model of the vocal tract is described. The vocal tract is acoustically modeled as a series of uniform cross-section tubes concatenated end-to-end. Each section of tube is...
Analog VLSI Implementations of Continuous-Time Memory Structures (1996)
Jui-kuo Juan, John G. Harris, Jose C. Principe
The continuous-time implementation of the popular transversal filter is problematic since it is impossible to implement an ideal time delay in continuous-time hardware. We believe that building an...
A Continuous-Time Analog Circuit for Computing Time Delays Between Signals (1996)
Chiang-jung Pu, John G. Harris
We describe an analog VLSI circuit that computes the time delay between an arbitrary input signal and its delayed version. Versions of this circuit will be used as the basic computational elements...
Implementing Radial Basis Functions Using Bump-Resistor Networks (1994)
Radial Basis Function (RBF) networks provide a powerful learning architecture for neural networks [6]. We have implemented a RBF network in analog VLSI using the concept of bump-resistors. A...
Analog models for early vision (1991)
Analog models provide a novel framework for understanding and developing algorithms for computer vision. This thesis introduces several extensions to well-known resistive network techniques for...
Analog Models for Early Vision (1991)
John G. Harris, John G. Harris
Analog models provide a novel framework for understanding and developing algorithms for computer vision. This thesis introduces several extensions to well-known resistive network techniques for...
Rigid Body Motion from Range Image Sequences (1991)
An algorithm is described for recovering the six degrees of free-dom of motion of a vehicle from a sequence of range images of a static environment taken by a range camera rigidly attached to the...
The Coupled Depth/Slope Approach to Surface Reconstruction (1986)
Reconstructing a surface from sparse sensory data is a well known problem in computer vision. Early vision modules typically supply sparse depth, orientation and discontinuity information. The...
The Coupled Depth/Slope Approach to Surface Reconstruction (1986)
Reconstructing a surface from sparse sensory data is a well known problem in computer vision. Early vision modules typically supply sparse depth, orientation and discontinuity information. The...
The coupled depth/slope approach to surface reconstruction /--by John G. Harris. (1986)
Supervised by Thomas F. Knight.