The Short-Time Modifies Coherence Representation and its Application for Noisy Speech Recognition

  • Juang B.
  • Mansour D.

A technique for robust spectral representation of all-pole sequences is proposed. It is shown that the autocorrelation of an all-pole sequence, obtained by passing white noise through an all-pole filter 1/A(z), is an all-pole sequence of the form 1/A sup 2 (z).

A Family of Distortion Measures Based Upon Projection Operation for Robust Speech Recognition

  • Juang B.
  • Mansour D.

This paper aims at the formulation of speech similarity measures, a fundamental component in recognizer designs, that are robust to the ambient condition change. Our consideration focuses on the speech cepstrum derived from linear prediction coefficients (the LPC cepstrum).

Model Development and Verification for High Level Analog Blocks

  • Chadha R.
  • Chen C.
  • Visweswariah C.

This paper proposes a methodology for describing analog blocks at the behavioral level. A verification tool, ACME, has been developed to verify the functionality of a behavioral model before incorporating it in a simulation environment. Futhermore, the generation of time domain models for frequency domain transfer functions H(s) and H(z) ...

Life After the Schematic: The Impact of Circuit Operation on the Physical Realization of Electronic Power Supplies

  • Wilson T.

There can be something very comforting about the experience of returning home and finding pieces of your past that are still the way you remember them from your chilhood.

Implementation of Real-Time DSP Applications Using the AT&T DSP32 C Compiler and Application Library

  • Gay S.
  • Hartung J.
  • Tow J.

Digital Signal Processors have traditionally been used in realtime applications with very high data throughput.

Focused Ion Beam Patterning Techniques for Optoelectronic Materials and Devices

  • Harriott L.
  • Panish M.
  • Temkin H.

The application of thin semiconductor layers as etch masks for high vacuum lithography is described. Heteroepitaxial layers of InGaAs or InP as thin as 30A were grown by molecular beam epitaxy and patterned using a submicron focused Ga ion beam at low exposure doses. The ion-exposed thin layer can then ...

Tuxedo(TM) Transaction Processing System for 3B Computers

  • Dwyer T.

AT&T's UNIX(R) System V is widely accepted as the standard operating system for time-sharing applications on small- and medium-size computers, such as AT&T's 3B2/600 Supermicro and its new multiprocessor 3B4000.

Foreword: Voice Coding for Communications

  • Aoyama T.
  • Daumer W.
  • Modena G.

INTRODUCTION: Since the introduction of 64 kbit/s A- and MU- law PCM in the international telecommunications networks over 25 years ago, planners have been striving to introduce more efficient methods of converting 4 kHz voiceband signals into digital form for transmission.

The Use of Simulation Technology in Software System Design and Prototyping

  • Anderson T.

The specification, design and construction of large software systems is a difficult task. Most software engineering methodologies divide the task into somewhat independent phases with the possibility of looping back to repeat a phase or several phases after testing the current phase.

High Temperature Superconductor Oxide Films by Sputtering, Spin-On/Pyrolysis Technique, e-Beam and Thermal Evaporation and Molecular Beam Epitaxy

  • Chen H.
  • Davidson B.
  • Dayem A.
  • Dynes R.
  • Farrow R.
  • Feldman L.
  • Fiory A.
  • Fleming R.
  • Gurvitch M.
  • Hobbins N.
  • Hong M.
  • Howard R.
  • Hsieh T.
  • Jacobson D.
  • Kortan A.
  • Kwo J.
  • Levi A.
  • Liou S.
  • Mankiewich P.
  • Poate J.
  • Rice C.
  • Short K.
  • Skocpol W.
  • White A.

Various methods have been employed to prepare high T sub c oxide films mostly in the Y-Ba-Cu-O system. In this talk we review the state of the art of fabrication, processes, structural characteristics, and superconducting properties (and devices) of the films from each technique.

Epitaxial Films of High T sub c Oxide Superconductors Y sub 1 Ba sub 2 Cu sub 3 O sub 7 Grown on SrTiO sub 3 by Molecular Beam Epitaxy

  • Davidson B.
  • Feldman L.
  • Fleming R.
  • Hong M.
  • Hsieh T.
  • Kwo J.
  • Liou S.

Orientation ordered high-T sub c oxide films of Y sub 1 Ba sub 2 Cu sub 3 O sub 7 were prepared by molecular beam epitaxy on the SrTiO sub 3 substrates.

Complexity, Two-Level Morphology and Finnish

  • Church K.
  • K. Koskenniemi

Although Two-Level Morphology has been found in practice to be an extremely efficient method for processing Finnish words on very small machines, [Barton86] has recently shown the method to be NP-hard. This paper will discuss Barton's theoretical argument and explain why it has not been a problem for us in ...

Intermodulation Distortion in Optical Amplifiers from Carrier-Density Modulation

  • Darcie T.
  • Jopson R.
  • Tkach R.

We present a theoretical model describing the generation of intermodulation products (IMPs) in semiconductor optical amplifiers by signal-induced carrier-density modulation. The IMPs depend strongly on the linewidth-enhancement factor and the ratio of input power to the saturation power of the amplifier. Calculation of the total intermodulation penalty for multichannel amplifier ...

Molecular Resolution in Scanning Tunneling Microscopy of an Organic Crystal Surface

  • Sleator T.
  • Tycko R.

STM pictures of the surface of a tetrathiafulvalent/tetracyanoquinodimethane (TTF/TCNQ) single crystal have been obtained in air at ambient temperature and pressure. Individual organic molecules are resolved; the surface is shown to be highly ordered.

Economic Trunk Group Sizing for Stochastic Traffic Demands

  • Lynch D.
  • Moreland J.

The planned growth of networks is based upon a deterministic forecast of future demands. That is, most planning systems do not fully account for the uncertainty of the forecast.

The Design of an Optical Digital Computer

  • Downs M.
  • Prise M.
  • Streibl N.
  • Walker S.

We present experimental results showing how to use planar arrays of optical logic devices to build an optical digital computer.

Optical Crossover Interconnects (NOT PUBLISHED)

  • Jahns J.

Optical digital computers or switching systems depend largely on efficient ways of transmitting data between different layers of logic devices. The crossover network is presented as an alternative to the banyan or the perfect shuffle.

Selection and Test Criteria for Polymeric Materials for Tactical Fiber-Optic Cables

  • Kathiresan K.
  • Overton B.
  • Santana M.
  • Shea J.
  • Taylor C.

INTRODUCTION: For over a decade, optical fibers have been used extensively in the telecommunication industry. In recent years, there has been a significant thrust to use optical fibers in a variety of military applications. However, in military applications the thermal and mechanical requirements are more stringent than in telecommunication applications.

Limitations to the OMVPE Growth of Hg Compounds Due to Hydrodynamic Effects

  • Jensen K.
  • Kisker D.
  • Mckenna D.

The use of organometallic vapor phase epitaxy as a growth technique for the growth of Hg-containing semiconductors has been hindered due to lack of reproducibility and uniformity. In this work, the role of transport processes in the vapor phase growth is considered.

Solid State NMR Study of Phase Transitions in Poly(Organophosphazenes)

  • Chichester-Hicks S.
  • Gomez M.
  • Haddon R.
  • Tanaka H.
  • Tonelli A.

AT&T Bell Laboratories - Variable temperature sup 13 C and sup 31 P NMR in the solid state has been used to study the phase transitions observed by differential scanning calorimetry in poly(bis(4-ethylphenoxy)phosphazene) Differences in chemical shift positions and spin lattice relaxation times, T, provide information about the solid state ...